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98 results on '"Geltenbort, P"'

1. Improved neutron lifetime measurement with UCN$\tau$

Author

Gonzalez, F. M., Fries, E. M., Cude-Woods, C., Bailey, T., Blatnik, M., Broussard, L. J., Callahan, N. B., Choi, J. H., Clayton, S. M., Currie, S. A., Dawid, M., Dees, E. B., Filippone, B. W., Fox, W., Geltenbort, P., George, E., Hayen, L., Hickerson, K. P., Hoffbauer, M. A., Hoffman, K., Holley, A. T., Ito, T. M., Komives, A., Liu, C. -Y., Makela, M., Morris, C. L., Musedinovic, R., O'Shaughnessy, C., Pattie, Jr., R. W., Ramsey, J., Salvat, D. J., Saunders, A., Sharapov, E. I., Slutsky, S., Su, V., Sun, X., Swank, C., Tang, Z., Uhrich, W., Vanderwerp, J., Walstrom, P., Wang, Z., Wei, W., Young, A. R., Gonzalez, F. M., Fries, E. M., Cude-Woods, C., Bailey, T., Blatnik, M., Broussard, L. J., Callahan, N. B., Choi, J. H., Clayton, S. M., Currie, S. A., Dawid, M., Dees, E. B., Filippone, B. W., Fox, W., Geltenbort, P., George, E., Hayen, L., Hickerson, K. P., Hoffbauer, M. A., Hoffman, K., Holley, A. T., Ito, T. M., Komives, A., Liu, C. -Y., Makela, M., Morris, C. L., Musedinovic, R., O'Shaughnessy, C., Pattie, Jr., R. W., Ramsey, J., Salvat, D. J., Saunders, A., Sharapov, E. I., Slutsky, S., Su, V., Sun, X., Swank, C., Tang, Z., Uhrich, W., Vanderwerp, J., Walstrom, P., Wang, Z., Wei, W., and Young, A. R.

Abstract

We report an improved measurement of the free neutron lifetime $\tau_{n}$ using the UCN$\tau$ apparatus at the Los Alamos Neutron Science Center. We counted a total of approximately $38\times10^{6}$ surviving ultracold neutrons (UCN) after storing in UCN$\tau$'s magneto-gravitational trap over two data acquisition campaigns in 2017 and 2018. We extract $\tau_{n}$ from three blinded, independent analyses by both pairing long and short storage-time runs to find a set of replicate $\tau_{n}$ measurements and by performing a global likelihood fit to all data while self-consistently incorporating the $\beta$-decay lifetime. Both techniques achieve consistent results and find a value $\tau_{n}=877.75\pm0.28_{\text{ stat}}+0.22/-0.16_{\text{ syst}}$~s. With this sensitivity, neutron lifetime experiments now directly address the impact of recent refinements in our understanding of the standard model for neutron decay., Comment: 7 pages, 2 figures, 3 tables

Published
2021
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2. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Author

Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., Zimmer, O., Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., and Zimmer, O.

Abstract

The violation of baryon number, , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation () via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state (), and neutron disappearance (n → n'); the effective process of neutron regeneration () is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addre

Published
2021
Full Text
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3. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Author

Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., Zimmer, O., Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., and Zimmer, O.

Abstract

The violation of baryon number, , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation () via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state (), and neutron disappearance (n → n'); the effective process of neutron regeneration () is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addre

Published
2021
Full Text
View/download PDF

4. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Author

Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., Zimmer, O., Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., and Zimmer, O.

Abstract

The violation of baryon number, , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation () via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state (), and neutron disappearance (n → n'); the effective process of neutron regeneration () is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addre

Published
2021
Full Text
View/download PDF

5. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Author

Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, Christian, Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, Katherine, Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V, Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, T., Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J., Meirose, Bernhard, Miller, T. M., Milstead, David, Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie, R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M., Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, Samuel, Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, Sze Chun, Young, A. R., Zanini, L., Zhang, Z., Zimmer, O., Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, Christian, Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, Katherine, Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V, Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, T., Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J., Meirose, Bernhard, Miller, T. M., Milstead, David, Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie, R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M., Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, Samuel, Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, Sze Chun, Young, A. R., Zanini, L., Zhang, Z., and Zimmer, O.

Abstract

The violation of baryon number, , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation () via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state (), and neutron disappearance (n → n'); the effective process of neutron regeneration () is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addre

Published
2021
Full Text
View/download PDF

6. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Author

Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., Zimmer, O., Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., and Zimmer, O.

Abstract

The violation of baryon number, , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation () via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state (), and neutron disappearance (n → n'); the effective process of neutron regeneration () is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addre

Published
2021
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7. Improved neutron lifetime measurement with UCN$\tau$

Author

Gonzalez, F. M., Fries, E. M., Cude-Woods, C., Bailey, T., Blatnik, M., Broussard, L. J., Callahan, N. B., Choi, J. H., Clayton, S. M., Currie, S. A., Dawid, M., Dees, E. B., Filippone, B. W., Fox, W., Geltenbort, P., George, E., Hayen, L., Hickerson, K. P., Hoffbauer, M. A., Hoffman, K., Holley, A. T., Ito, T. M., Komives, A., Liu, C. -Y., Makela, M., Morris, C. L., Musedinovic, R., O'Shaughnessy, C., Pattie, Jr., R. W., Ramsey, J., Salvat, D. J., Saunders, A., Sharapov, E. I., Slutsky, S., Su, V., Sun, X., Swank, C., Tang, Z., Uhrich, W., Vanderwerp, J., Walstrom, P., Wang, Z., Wei, W., Young, A. R., Gonzalez, F. M., Fries, E. M., Cude-Woods, C., Bailey, T., Blatnik, M., Broussard, L. J., Callahan, N. B., Choi, J. H., Clayton, S. M., Currie, S. A., Dawid, M., Dees, E. B., Filippone, B. W., Fox, W., Geltenbort, P., George, E., Hayen, L., Hickerson, K. P., Hoffbauer, M. A., Hoffman, K., Holley, A. T., Ito, T. M., Komives, A., Liu, C. -Y., Makela, M., Morris, C. L., Musedinovic, R., O'Shaughnessy, C., Pattie, Jr., R. W., Ramsey, J., Salvat, D. J., Saunders, A., Sharapov, E. I., Slutsky, S., Su, V., Sun, X., Swank, C., Tang, Z., Uhrich, W., Vanderwerp, J., Walstrom, P., Wang, Z., Wei, W., and Young, A. R.

Abstract

We report an improved measurement of the free neutron lifetime $\tau_{n}$ using the UCN$\tau$ apparatus at the Los Alamos Neutron Science Center. We counted a total of approximately $38\times10^{6}$ surviving ultracold neutrons (UCN) after storing in UCN$\tau$'s magneto-gravitational trap over two data acquisition campaigns in 2017 and 2018. We extract $\tau_{n}$ from three blinded, independent analyses by both pairing long and short storage-time runs to find a set of replicate $\tau_{n}$ measurements and by performing a global likelihood fit to all data while self-consistently incorporating the $\beta$-decay lifetime. Both techniques achieve consistent results and find a value $\tau_{n}=877.75\pm0.28_{\text{ stat}}+0.22/-0.16_{\text{ syst}}$~s. With this sensitivity, neutron lifetime experiments now directly address the impact of recent refinements in our understanding of the standard model for neutron decay., Comment: 7 pages, 2 figures, 3 tables

Published
2021
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8. A device for simultaneous spin analysis of ultracold neutrons

Author

Afach, S., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Z., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, M., Kermaïdic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F., Pignol, G., Prashanth, P., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Afach, S., Ban, G., Bison, G., Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Z., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, M., Kermaïdic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Naviliat-Cuncic, O., Piegsa, F., Pignol, G., Prashanth, P., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Abstract

We report on the design and first tests of a device allowing for measurement of ultracold neutrons polarisation by means of the simultaneous analysis of the two spin components. The device was developed in the framework of the neutron electric dipole moment experiment at the Paul Scherrer Institute. Individual parts and the entire newly built system have been characterised with ultracold neutrons. The gain in statistical sensitivity obtained with the simultaneous spin analyser is $(18.2\pm 6.1)$ % relative to the former sequential analyser under nominal running conditions.

Published
2021

9. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Author

Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cederc ll, J., Crawford, C., Dev, P. S.B., Dijulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, T., Jönsson, L., Jwa, Y. J., Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie, R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J. M., Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., De Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., Zimmer, O., Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cederc ll, J., Crawford, C., Dev, P. S.B., Dijulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, T., Jönsson, L., Jwa, Y. J., Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie, R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J. M., Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., De Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., and Zimmer, O.

Abstract

The violation of baryon number, is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron-antineutron oscillation via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state , and neutron disappearance (n → n′); the effective process of neutron regeneration is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addresses topical open questions such as the origins of baryogenesis and the nature of dark matter, and is sensitive to scales of new physics substantially in excess of those available at colliders. A goal of the program is to open a discovery window to neutron conversion probabilities (sensitivities) by up to three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity tests should not be squandered. The experiment pulls together a diverse international team of physicists from the particle (collider and low energy) and nuclear physics communities, while also including specialists in neutronics and magnetics.

Published
2021

10. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Author

Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., Zimmer, O., Addazi, A., Anderson, K., Ansell, S., Babu, K. S., Barrow, J. L., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Biondi, R., Bohm, C., Brooijmans, G., Broussard, L. J., Cedercäll, J., Crawford, C., Dev, P. S. B., DiJulio, D. D., Dolgov, A. D., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M. J., Gardiner, S., Gardner, S., Galindo-Uribarri, A., Geltenbort, P., Girmohanta, S., Golubev, P., Golubeva, E., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Holley, A., Ichikawa, G., Ito, T. M., Iverson, E., Johansson, Tord, Jönsson, L., Jwa, Y-J, Kamyshkov, Y., Kanaki, K., Kearns, E., Kokai, Z., Kerbikov, B., Kitaguchi, M., Kittelmann, T., Klinkby, E., Kobakhidze, A., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryavtsev, V., Kupsc, A., Lee, Y. T., Lindroos, M., Makkinje, J., Marquez, J. I., Meirose, B., Miller, T. M., Milstead, D., Mohapatra, R. N., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nepomuceno, A., Nesti, F., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr., R. W., Penttil, S., Perrey, H., Pokotilovski, Y. N., Potashnikovav, I., Ramic, K., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Rizzi, N., Rossi, N., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Tkachev, I., Townsend, L., Tureanu, A., Varriano, L., Vainshtein, A., de Vries, J., Wagner, R., Woracek, R., Yamagata, Y., Yiu, S., Young, A. R., Zanini, L., Zhang, Z., and Zimmer, O.

Abstract

The violation of baryon number, , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation () via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state (), and neutron disappearance (n → n'); the effective process of neutron regeneration () is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addre

Published
2021
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11. Measurement of the permanent electric dipole moment of the neutron

Author

Abel, C., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Bondar, V., Burghoff, M., Chanel, E., Chowdhuri, Z., Chiu, P. -J., Clement, B., Crawford, C. B., Daum, M., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Flaux, P., Franke, B., Fratangelo, A., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hayen, L., Heil, W., Henneck, R., Hélaine, V., Hild, N., Hodge, Z., Horras, M., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Knecht, A., Knowles, P., Koch, H. -C., Koss, P. A., Komposch, S., Kozela, A., Kraft, A., Krempel, J., Kuźniak, M., Lauss, B., Lefort, T., Lemière, Y., Leredde, A., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pierre, E., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Rienäcker, I., Ries, D., Roccia, S., Rogel, G., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Dinani, R. Tavakoli, Thorne, J. A., Virot, R., Voigt, J., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zenner, J., Zsigmond, G., Abel, C., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Bondar, V., Burghoff, M., Chanel, E., Chowdhuri, Z., Chiu, P. -J., Clement, B., Crawford, C. B., Daum, M., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Flaux, P., Franke, B., Fratangelo, A., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hayen, L., Heil, W., Henneck, R., Hélaine, V., Hild, N., Hodge, Z., Horras, M., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Knecht, A., Knowles, P., Koch, H. -C., Koss, P. A., Komposch, S., Kozela, A., Kraft, A., Krempel, J., Kuźniak, M., Lauss, B., Lefort, T., Lemière, Y., Leredde, A., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pierre, E., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Rienäcker, I., Ries, D., Roccia, S., Rogel, G., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Dinani, R. Tavakoli, Thorne, J. A., Virot, R., Voigt, J., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zenner, J., and Zsigmond, G.

Abstract

We present the result of an experiment to measure the electric dipole moment (EDM) of the neutron at the Paul Scherrer Institute using Ramsey's method of separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in the long history of EDM experiments probing physics violating time reversal invariance. The salient features of this experiment were the use of a Hg-199 co-magnetometer and an array of optically pumped cesium vapor magnetometers to cancel and correct for magnetic field changes. The statistical analysis was performed on blinded datasets by two separate groups while the estimation of systematic effects profited from an unprecedented knowledge of the magnetic field. The measured value of the neutron EDM is $d_{\rm n} = (0.0\pm1.1_{\rm stat}\pm0.2_{\rm sys})\times10^{-26}e\,{\rm cm}$., Comment: 5 pages, 4 figures, submitted to PRL on 18.12.2019

Published
2020
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12. Magnetic-field uniformity in neutron electric-dipole-moment experiments

Author

Abel, C., Ayres, N. J., Baker, T., Ban, G., Bison, G., Bodek, K., Bondar, V., Crawford, C. B., Chiu, P.-J., Chanel, E., Chowdhuri, Z., Daum, M., Dechenaux, B., Emmenegger, S., Ferraris-Bouchez, L., Flaux, P., Geltenbort, P., Green, K., Griffith, W. C., Grinten, M. van der, Harris, P. G., Henneck, R., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Leredde, A., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Virot, R., Weis, Antoine, Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Baker, T., Ban, G., Bison, G., Bodek, K., Bondar, V., Crawford, C. B., Chiu, P.-J., Chanel, E., Chowdhuri, Z., Daum, M., Dechenaux, B., Emmenegger, S., Ferraris-Bouchez, L., Flaux, P., Geltenbort, P., Green, K., Griffith, W. C., Grinten, M. van der, Harris, P. G., Henneck, R., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Leredde, A., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Virot, R., Weis, Antoine, Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Abstract

Magnetic-field uniformity is of the utmost importance in experiments to measure the electric dipole moment of the neutron. A general parametrization of the magnetic field in terms of harmonic polynomial modes is proposed, going beyond the linear- gradients approximation. We review the main undesirable effects of nonuniformities: depolarization of ultracold neutrons and Larmor frequency shifts of neutrons and mercury atoms. The theoretical predictions for these effects were verified by dedicated measurements with the single-chamber neutron electric-dipole-moment apparatus installed at the Paul Scherrer Institute.

Published
2019

13. Magnetic field uniformity in neutron electric dipole moment experiments

Author

Abel, C., Ayres, N., Baker, T., Ban, G., Bison, G., Bodek, K., Bondar, V., Crawford, C., Chiu, P. -J., Chanel, E., Chowdhuri, Z., Daum, M., Dechenaux, B., Emmenegger, S., Ferraris-Bouchez, L., Flaux, P., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Harris, P. G., Henneck, R., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Leredde, A., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Virot, R., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Abel, C., Ayres, N., Baker, T., Ban, G., Bison, G., Bodek, K., Bondar, V., Crawford, C., Chiu, P. -J., Chanel, E., Chowdhuri, Z., Daum, M., Dechenaux, B., Emmenegger, S., Ferraris-Bouchez, L., Flaux, P., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Harris, P. G., Henneck, R., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Leredde, A., Mohanmurthy, P., Pais, D., Piegsa, F. M., Pignol, G., Quéméner, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Schnabel, A., Severijns, N., Virot, R., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Abstract

Magnetic field uniformity is of the utmost importance in experiments to measure the electric dipole moment of the neutron. A general parametrization of the magnetic field in terms of harmonic polynomial modes is proposed, going beyond the linear-gradients approximation. We review the main undesirable effects of non-uniformities: depolarization of ultracold neutrons, and Larmor frequency shifts of neutrons and mercury atoms. The theoretical predictions for these effects were verified by dedicated measurements with the single-chamber nEDM apparatus installed at the Paul Scherrer Institute.

Published
2018
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14. Towards a high-resolution TOF-MIEZE spectrometer with very cold neutrons

Author

Oda, T., Hino, M., Kitaguchi, M., Filter, H., Geltenbort, P., Kawabata, Y., Oda, T., Hino, M., Kitaguchi, M., Filter, H., Geltenbort, P., and Kawabata, Y.

Abstract

We report the first experimental test of TOF-MIEZE technique using very cold neutrons (VCNs) towards high-resolution quasi-elastic neutron scattering spectroscopy. TOF-MIEZE is a type of neutron resonance spin echo spectroscopy with a combination of the time-of-flight (TOF) method and modulation of intensity by zero effort (MIEZE). A compact MIEZE instrument was constructed at the VCN beam port at the High Flux Reactor at the Institut Laue Langevin. By accumulating individual oscillations of raw data, we observed a TOF-MIEZE signal with an effective frequency of 50 kHz in a wavelength band of 4–6 nm. The signal contrasts were 0.59 ± 0.04 and 0.29 ± 0.03 for wavelengths of 4 nm and 6 nm, respectively. The Fourier time was estimated to be 70 ns with 6 nm VCNs in the experimental set-up.

Published
2017

15. Search for axionlike dark matter through nuclear spin precession in electric and magnetic fields

Author

Abel, C, Ayres, NJ, Ban, G, Bison, G, Bodek, K, Bondar, V, Daum, M, Fairbairn, M, Flambaum, VV, Geltenbort, P, Green, K, Griffith, WC, Van Der Grinten, M, Grujić, ZD, Harris, PG, Hild, N, Iaydjiev, P, Ivanov, SN, Kasprzak, M, Kermaidic, Y, Kirch, K, Koch, HC, Komposch, S, Koss, PA, Kozela, A, Krempel, J, Lauss, B, Lefort, T, Lemiére, Y, Marsh, DJE, Mohanmurthy, P, Mtchedlishvili, A, Musgrave, M, Piegsa, FM, Pignol, G, Rawlik, M, Rebreyend, D, Ries, D, Roccia, S, Rozpȩdzik, D, Schmidt-Wellenburg, P, Severijns, N, Shiers, D, Stadnik, YV, Weis, A, Wursten, E, Zejma, J, Zsigmond, G, Abel, C, Ayres, NJ, Ban, G, Bison, G, Bodek, K, Bondar, V, Daum, M, Fairbairn, M, Flambaum, VV, Geltenbort, P, Green, K, Griffith, WC, Van Der Grinten, M, Grujić, ZD, Harris, PG, Hild, N, Iaydjiev, P, Ivanov, SN, Kasprzak, M, Kermaidic, Y, Kirch, K, Koch, HC, Komposch, S, Koss, PA, Kozela, A, Krempel, J, Lauss, B, Lefort, T, Lemiére, Y, Marsh, DJE, Mohanmurthy, P, Mtchedlishvili, A, Musgrave, M, Piegsa, FM, Pignol, G, Rawlik, M, Rebreyend, D, Ries, D, Roccia, S, Rozpȩdzik, D, Schmidt-Wellenburg, P, Severijns, N, Shiers, D, Stadnik, YV, Weis, A, Wursten, E, Zejma, J, and Zsigmond, G

Abstract

We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spinprecession frequencies of stored ultracold neutrons and 199Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10-24 ≤ ma ≤ 10-17 eV. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.

Published
2017

16. New experimental limits on neutron - mirror neutron oscillations in the presence of mirror magnetic field

Author

Berezhiani, Z., Biondi, R., Geltenbort, P., Krasnoshchekova, I. A., Varlamov, V. E., Vassiljev, A. V., Zherebtsov, O. M., Berezhiani, Z., Biondi, R., Geltenbort, P., Krasnoshchekova, I. A., Varlamov, V. E., Vassiljev, A. V., and Zherebtsov, O. M.

Abstract

Present probes do not exclude that the neutron ($n$) oscillation into mirror neutron ($n'$), a sterile state exactly degenerate in mass with the neutron, can be a very fast process, in fact faster than the neutron decay itself. This process is sensitive to the magnetic field. Namely, if the mirror magnetic field $\vec{B}'$ exists at the Earth, $n-n'$ oscillation probability can be suppressed or resonantly amplified by the applied magnetic field $\vec{B}$, depending on its strength and on the angle $\beta$ between $\vec{B}$ and $\vec{B}'$. We present the results of ultra-cold neutron storage measurements aiming to check the anomalies observed in previous experiments which could be a signal for $n-n'$ oscillation in the presence of mirror magnetic field $B'\sim 0.1$~G. Analyzing the experimental data on neutron loses, we obtain a new lower limit on $n-n'$ oscillation time $\tau_{nn'} > 17$ s (95 % C.L.) for any $B'$ between 0.08 and 0.17 G, and $\tau_{nn'}/\sqrt{\cos\beta} > 27 $s (95 % C.L.) for any $B'$ in the interval ($0.06\div0.25$) G.

Published
2017
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17. Search for axion-like dark matter through nuclear spin precession in electric and magnetic fields

Author

Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V. V., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Marsh, D. J. E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpędzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y. V., Weis, A., Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V. V., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Marsh, D. J. E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpędzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y. V., Weis, A., Wursten, E., Zejma, J., and Zsigmond, G.

Abstract

We report on a search for ultra-low-mass axion-like dark matter by analysing the ratio of the spin-precession frequencies of stored ultracold neutrons and $^{199}$Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range $10^{-24}~\textrm{eV} \le m_a \le 10^{-17}~\textrm{eV}$. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.

Published
2017
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18. Search for axion-like dark matter through nuclear spin precession in electric and magnetic fields

Author

Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V. V., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Marsh, D. J. E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpędzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y. V., Weis, A., Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N. J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V. V., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hild, N., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Koss, P. A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Marsh, D. J. E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F. M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpędzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y. V., Weis, A., Wursten, E., Zejma, J., and Zsigmond, G.

Abstract

We report on a search for ultra-low-mass axion-like dark matter by analysing the ratio of the spin-precession frequencies of stored ultracold neutrons and $^{199}$Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range $10^{-24}~\textrm{eV} \le m_a \le 10^{-17}~\textrm{eV}$. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.

Published
2017
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19. Search for axionlike dark matter through nuclear spin precession in electric and magnetic fields

Author

Abel, C., Ayres, N.?J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V.?V., Geltenbort, P., Green, K., Griffith, W.?C., Grinten, M. van der, Grujiæ, Z.?D., Harris, P.?G., Hild, N., Iaydjiev, P., Ivanov, S.?N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Koss, P.?A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemi?re, Y., Marsh, D.?J.?E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F.?M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpêdzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y.?V., Weis, Antoine, Wursten, E., Zejma, J., Zsigmond, G., Abel, C., Ayres, N.?J., Ban, G., Bison, G., Bodek, K., Bondar, V., Daum, M., Fairbairn, M., Flambaum, V.?V., Geltenbort, P., Green, K., Griffith, W.?C., Grinten, M. van der, Grujiæ, Z.?D., Harris, P.?G., Hild, N., Iaydjiev, P., Ivanov, S.?N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Koss, P.?A., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemi?re, Y., Marsh, D.?J.?E., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Piegsa, F.?M., Pignol, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpêdzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Stadnik, Y.?V., Weis, Antoine, Wursten, E., Zejma, J., and Zsigmond, G.

Abstract

We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spin-precession frequencies of stored ultracold neutrons and 199Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10−24≤ma≤10−17 eV. Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.

Published
2017

20. New experimental limits on neutron - mirror neutron oscillations in the presence of mirror magnetic field

Author

Berezhiani, Z., Biondi, R., Geltenbort, P., Krasnoshchekova, I. A., Varlamov, V. E., Vassiljev, A. V., Zherebtsov, O. M., Berezhiani, Z., Biondi, R., Geltenbort, P., Krasnoshchekova, I. A., Varlamov, V. E., Vassiljev, A. V., and Zherebtsov, O. M.

Abstract

Present probes do not exclude that the neutron ($n$) oscillation into mirror neutron ($n'$), a sterile state exactly degenerate in mass with the neutron, can be a very fast process, in fact faster than the neutron decay itself. This process is sensitive to the magnetic field. Namely, if the mirror magnetic field $\vec{B}'$ exists at the Earth, $n-n'$ oscillation probability can be suppressed or resonantly amplified by the applied magnetic field $\vec{B}$, depending on its strength and on the angle $\beta$ between $\vec{B}$ and $\vec{B}'$. We present the results of ultra-cold neutron storage measurements aiming to check the anomalies observed in previous experiments which could be a signal for $n-n'$ oscillation in the presence of mirror magnetic field $B'\sim 0.1$~G. Analyzing the experimental data on neutron loses, we obtain a new lower limit on $n-n'$ oscillation time $\tau_{nn'} > 17$ s (95 % C.L.) for any $B'$ between 0.08 and 0.17 G, and $\tau_{nn'}/\sqrt{\cos\beta} > 27 $s (95 % C.L.) for any $B'$ in the interval ($0.06\div0.25$) G.

Published
2017
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21. Pulsed neutron time-dependent intensity modulation for quasi-elastic neutron scattering spectroscopy

Author

Oda, T., Hino, M., Kitaguchi, M., Geltenbort, P., Kawabata, Y., Oda, T., Hino, M., Kitaguchi, M., Geltenbort, P., and Kawabata, Y.

Abstract

We propose a basic formula and demonstration for a high-resolution quasi-elastic neutron scattering (QENS) by combining the time-of-flight (TOF) method with Modulation of Intensity by Zero Effort (MIEZE) type neutron spin echo spectroscopy. The MIEZE technique has the potential to develop a unique approach to study on slow dynamics of condensed matter; however, the energy resolution is limited owing to the hypersensitivity of the MIEZE signal contrast to the echo condition, which is strongly affected by the alignment of the instruments and the sample. The narrow allowance of the optimal alignment is a major obstacle to the wide use of this technique. Combining the TOF method with MIEZE (TOF-MIEZE), the hypersensitivity of MIEZE signals is significantly alleviated with a short pulsed beam. This robustness is very useful to optimize experimental alignments and enables accurate measurements of QENS. The experimental results demonstrate the characteristic of the TOF-MIEZE technique and are well described by the formula presented in this study.

Published
2016

22. Revised experimental upper limit on the electric dipole moment of the neutron

Author

Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., Grinten, M. van der, Grujić, Z. D., Harris, P. G., Hélaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, Antoine, Winston, O. J., Wursten, E., Zejma, J., Zsigmond, G., Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., Grinten, M. van der, Grujić, Z. D., Harris, P. G., Hélaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H.-C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, Antoine, Winston, O. J., Wursten, E., Zejma, J., and Zsigmond, G.

Abstract

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in the understanding of the effects of gravity in depolarizing ultracold neutrons; an improved calculation of the spectrum of the neutrons; and conservative estimates of other possible systematic errors, which are also shown to be consistent with more recent measurements undertaken with the apparatus. We obtain a net result of dn=−0.21±1.82×10−26 e cm, which may be interpreted as a slightly revised upper limit on the magnitude of the EDM of 3.0×10−26 e cm (90% C.L.) or 3.6×10−26 e cm (95% C.L.).

Published
2016

23. A device for simultaneous spin analysis of ultracold neutrons

Author

Afach, S., Ban, G., Bison, Georg, Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Zoran. D., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, Malgorzata, Kermaïdic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Cuncic, O. Naviliat, Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Wellenburg, P. Schmidt, Severijns, N., Weis, Antoine, Wursten, E., Wyszynski, G., Zejma, J., Zsigmond, G., Afach, S., Ban, G., Bison, Georg, Bodek, K., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Grujić, Zoran. D., Hayen, L., Hélaine, V., Henneck, R., Kasprzak, Malgorzata, Kermaïdic, Y., Kirch, K., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemière, Y., Mtchedlishvili, A., Cuncic, O. Naviliat, Piegsa, F. M., Pignol, G., Prashanth, P. N., Quéméner, G., Rawlik, M., Ries, D., Rebreyend, D., Roccia, S., Rozpedzik, D., Wellenburg, P. Schmidt, Severijns, N., Weis, Antoine, Wursten, E., Wyszynski, G., Zejma, J., and Zsigmond, G.

Abstract

We report on the design and first tests of a device allowing for measurement of ultracold neutrons polarisation by means of the simultaneous analysis of the two spin components. The device was developed in the framework of the neutron electric dipole moment experiment at the Paul Scherrer Institute. Individual parts and the entire newly built system have been characterised with ultracold neutrons. The gain in statistical sensitivity obtained with the simultaneous spin analyser is (18.2±6.1)% relative to the former sequential analyser under nominal running conditions.

Published
2016

24. A Gravity of Earth Measurement with a qBOUNCE Experiment

Author

Cronenberg, G., Filter, H., Thalhammer, M., Jenke, T., Abele, H., Geltenbort, P., Cronenberg, G., Filter, H., Thalhammer, M., Jenke, T., Abele, H., and Geltenbort, P.

Abstract

We report a measurement of the local acceleration $g$ with ultracold neutrons based on quantum states in the gravity potential of the Earth. The new method uses resonant transitions between the states $|1> -> |3>$ and for the first time between $|1> -> |4>$. The measurements demonstrate that Newton's Inverse Square Law of Gravity is understood at micron distances at an energy level of $10^{-14}$ eV with $\frac{\Delta g}{g}=4\times10^{-3}$. The results provide constraints on any possible gravity-like interaction at a micrometer interaction range. In particular, a dark energy candidate, the chameleon field is restricted to $\beta<6.9\times10^{6}$ for $n=2$ (95\% C.L.)., Comment: Proceedings of the EPS Conference on High Energy Physics 2015

Published
2015

25. A Revised Experimental Upper Limit on the Electric Dipole Moment of the Neutron

Author

Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Winston, O. J., Wursten, E., Zejma, J., Zsigmond, G., Pendlebury, J. M., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Burghoff, M., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., May, D. J. R., Musgrave, M., Naviliat-Cuncic, O., Piegsa, F. M., Pignol, G., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Richardson, J. D., Ries, D., Roccia, S., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Winston, O. J., Wursten, E., Zejma, J., and Zsigmond, G.

Abstract

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in the understanding of the effects of gravity in depolarizing ultracold neutrons (UCN); an improved calculation of the spectrum of the neutrons; and conservative estimates of other possible systematic errors, which are also shown to be consistent with more recent measurements undertaken with the apparatus. We obtain a net result of $d_\mathrm{n} = -0.21 \pm 1.82 \times10^{-26}$ $e$cm, which may be interpreted as a slightly revised upper limit on the magnitude of the EDM of $3.0 \times10^{-26}$ $e$cm (90% CL) or $ 3.6 \times10^{-26}$ $e$cm (95% CL). This paper is dedicated by the remaining authors to the memory of Prof. J. Michael Pendlebury., Comment: 23 pages, 19 figures. Authorship list changed to put J.M. Pendlebury first. Other very minor edits

Published
2015
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26. Gravity experiments with ultracold neutrons and the qBounce experiment

Author

Jenke, T., Cronenberg, G., Thalhammer, M., Rechberger, T., Geltenbort, P., Abele, H., Jenke, T., Cronenberg, G., Thalhammer, M., Rechberger, T., Geltenbort, P., and Abele, H.

Abstract

This work focuses on the control and understanding of a gravitationally interacting elementary quantum system. It offers a new way of looking at gravitation based on quantum interference: an ultracold neutron, a quantum particle, as an object and as a tool. The ultracold neutron as a tool reflects from a mirror in well-defined quantum states in the gravity potential of the earth allowing to apply the concept of gravity resonance spectroscopy (GRS). GRS relies on frequency measurements, which provide a spectacular sensitivity., Comment: Proccedings from the Gravitation session of the 50th Rencontres de Moriond conference, Gravitation: 100 years after GR

Published
2015

27. Gravitational Depolarization of Ultracold Neutrons: Comparison with Data

Author

Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Fertl, M., Franke, B., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Heil, W., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Musgrave, M., Naviliat-Cunic, O., Pendlebury, J. M., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., Zenner, J., Zsigmond, G., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Fertl, M., Franke, B., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujic, Z. D., Harris, P. G., Heil, W., Helaine, V., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Koch, H. -C., Komposch, S., Kozela, A., Krempel, J., Lauss, B., Lefort, T., Lemiere, Y., Musgrave, M., Naviliat-Cunic, O., Pendlebury, J. M., Piegsa, F. M., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quemener, G., Rawlik, M., Rebreyend, D., Ries, D., Roccia, S., Rozpedzik, D., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Thorne, J. A., Weis, A., Wursten, E., Zejma, J., Zenner, J., and Zsigmond, G.

Abstract

We compare the expected effects of so-called gravitationally enhanced depolarization of ultracold neutrons to measurements carried out in a spin-precession chamber exposed to a variety of vertical magnetic-field gradients. In particular, we have investigated the dependence upon these field gradients of spin depolarization rates and also of shifts in the measured neutron Larmor precession frequency. We find excellent qualitative agreement, with gravitationally enhanced depolarization accounting for several previously unexplained features in the data., Comment: 10 pages, 6 figures. Updated: section added about implications for current nEDM limit

Published
2015
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28. Precision measurement of the neutron beta-decay asymmetry

Author

Mendenhall, M. P., Pattie, R. W., Bagdasarova, Y., Berguno, D. B., Broussard, L. J., Carr, Rachel E., Currie, S., Ding, X., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Holley, A. T., Hong, R., Ito, T. M., Knecht, A., Liu, C. Y., Liu, J. L., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Moore, S. D., Morris, C. L., Galvan, A. P., Picker, R., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sondheim, W. E., Tatar, E., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Young, A. R., Zeck, B. A., Ucna Collaboration, Mendenhall, M. P., Pattie, R. W., Bagdasarova, Y., Berguno, D. B., Broussard, L. J., Carr, Rachel E., Currie, S., Ding, X., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Holley, A. T., Hong, R., Ito, T. M., Knecht, A., Liu, C. Y., Liu, J. L., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Moore, S. D., Morris, C. L., Galvan, A. P., Picker, R., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sondheim, W. E., Tatar, E., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Young, A. R., Zeck, B. A., and Ucna Collaboration

Abstract

A new measurement of the neutron beta-decay asymmetry A(0) has been carried out by the UCNA Collaboration using polarized ultracold neutrons (UCNs) from the solid deuterium UCN source at the Los Alamos Neutron Science Center. Improvements in the experiment have led to reductions in both statistical and systematic uncertainties leading to A(0) = -0.11954(55)(stat)(98)(syst), corresponding to the ratio of axial-vector to vector coupling lambda = g(A)/g(V) = -1.2756(30).

Published
2013
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29. Precision measurement of the neutron beta-decay asymmetry

Author

Physics, Mendenhall, M. P., Pattie, R. W., Bagdasarova, Y., Berguno, D. B., Broussard, L. J., Carr, Rachel E., Currie, S., Ding, X., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Holley, A. T., Hong, R., Ito, T. M., Knecht, A., Liu, C. Y., Liu, J. L., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Moore, S. D., Morris, C. L., Galvan, A. P., Picker, R., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sondheim, W. E., Tatar, E., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Young, A. R., Zeck, B. A., Ucna Collaboration, Physics, Mendenhall, M. P., Pattie, R. W., Bagdasarova, Y., Berguno, D. B., Broussard, L. J., Carr, Rachel E., Currie, S., Ding, X., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Holley, A. T., Hong, R., Ito, T. M., Knecht, A., Liu, C. Y., Liu, J. L., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Moore, S. D., Morris, C. L., Galvan, A. P., Picker, R., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Saunders, A., Seestrom, S. J., Sharapov, E. I., Sondheim, W. E., Tatar, E., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Young, A. R., Zeck, B. A., and Ucna Collaboration

Abstract

A new measurement of the neutron beta-decay asymmetry A(0) has been carried out by the UCNA Collaboration using polarized ultracold neutrons (UCNs) from the solid deuterium UCN source at the Los Alamos Neutron Science Center. Improvements in the experiment have led to reductions in both statistical and systematic uncertainties leading to A(0) = -0.11954(55)(stat)(98)(syst), corresponding to the ratio of axial-vector to vector coupling lambda = g(A)/g(V) = -1.2756(30).

Published
2013

30. Apparatus for Measurement of the Electric Dipole Moment of the Neutron using a Cohabiting Atomic-Mercury Magnetometer

Author

Baker, C. A., Chibane, Y., Chouder, M., Geltenbort, P., Green, K., Harris, P. G., Heckel, B. R., Iaydjiev, P., Ivanov, S. N., Kilvington, I., Lamoreaux, S. K., May, D. J., Pendlebury, J. M., Richardson, J. D., Shiers, D. B., Smith, K. F., van der Grinten, M., Baker, C. A., Chibane, Y., Chouder, M., Geltenbort, P., Green, K., Harris, P. G., Heckel, B. R., Iaydjiev, P., Ivanov, S. N., Kilvington, I., Lamoreaux, S. K., May, D. J., Pendlebury, J. M., Richardson, J. D., Shiers, D. B., Smith, K. F., and van der Grinten, M.

Abstract

A description is presented of apparatus used to carry out an experimental search for an electric dipole moment of the neutron, at the Institut Laue-Langevin (ILL), Grenoble. The experiment incorporated a cohabiting atomic-mercury magnetometer in order to reduce spurious signals from magnetic field fluctuations. The result has been published in an earlier letter; here, the methods and equipment used are discussed in detail.

Published
2013
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31. Performance of the Los Alamos National Laboratory spallation-driven solid-deuterium ultra-cold neutron source

Author

Physics, Saunders, A., Makela, M., Bagdasarova, Y., Back, H. O., Boissevain, J. G., Broussard, L. J., Bowles, T. J., Carr, Rachel E., Currie, S. A., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hill, R. E., Hoagland, J., Hoedl, S. A., Holley, A. T., Hogan, G., Ito, T. M., Lamoreaux, Steve, Liu, Chen-Yu, Liu, J., Mammei, R. R., Martin, J., Melconian, D., Mendenhall, M. P., Morris, C. L., Mortensen, R. N., Pattie, R. W., Jr., Pitt, M., Plaster, B., Ramsey, J., Rios, R., Sallaska, A. L., Seestrom, S. J., Sharapov, E. I., Sjue, S., Sondheim, W. E., Teasdale, W., Young, A. R., VornDick, B., Vogelaar, R. Bruce, Wang, Z., Xu, Yanping, Physics, Saunders, A., Makela, M., Bagdasarova, Y., Back, H. O., Boissevain, J. G., Broussard, L. J., Bowles, T. J., Carr, Rachel E., Currie, S. A., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hill, R. E., Hoagland, J., Hoedl, S. A., Holley, A. T., Hogan, G., Ito, T. M., Lamoreaux, Steve, Liu, Chen-Yu, Liu, J., Mammei, R. R., Martin, J., Melconian, D., Mendenhall, M. P., Morris, C. L., Mortensen, R. N., Pattie, R. W., Jr., Pitt, M., Plaster, B., Ramsey, J., Rios, R., Sallaska, A. L., Seestrom, S. J., Sharapov, E. I., Sjue, S., Sondheim, W. E., Teasdale, W., Young, A. R., VornDick, B., Vogelaar, R. Bruce, Wang, Z., and Xu, Yanping

Abstract

In this paper, we describe the performance of the Los Alamos spallation-driven solid-deuterium ultra-cold neutron (UCN) source. Measurements of the cold neutron flux, the very low energy neutron production rate, and the UCN rates and density at the exit from the biological shield are presented and compared to Monte Carlo predictions. The cold neutron rates compare well with predictions from the Monte Carlo code MCNPX and the UCN rates agree with our custom UCN Monte Carlo code. The source is shown to perform as modeled. The maximum delivered UCN density at the exit from the biological shield is 52(9) UCN/cc with a solid deuterium volume of similar to 1500 cm(3). (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770063]

Published
2013

32. Observation of the Spatial Distribution of Gravitationally Bound Quantum States of Ultracold Neutrons and Its Derivation Using the Wigner Function

Author

Ichikawa, G., Komamiya, S., Kamiya, Y., Minami, Y., Tani, M., Geltenbort, P., Yamamura, K., Nagano, M., Sanuki, T., Kawasaki, S., Hino, M., Kitaguchi, M., Ichikawa, G., Komamiya, S., Kamiya, Y., Minami, Y., Tani, M., Geltenbort, P., Yamamura, K., Nagano, M., Sanuki, T., Kawasaki, S., Hino, M., and Kitaguchi, M.

Abstract

Ultracold neutrons (UCNs) can be bound by the potential of terrestrial gravity and a reflecting mirror. The wave function of the bound state has characteristic modulations. We carried out an experiment to observe the vertical distribution of the UCNs above such a mirror at Institut Laue-Langevin in 2011. The observed modulation is in good agreement with that prediction by quantum mechanics using the Wigner function. The spatial resolution of the detector system is estimated to be 0.7 micro meter. This is the first observation of gravitationally bound states of UCNs with submicron spatial resolution., Comment: 5 pages, 3 figures

Published
2013
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33. Measurement of the neutron beta-asymmetry parameter A(0) with ultracold neutrons

Author

Plaster, B., Rios, R., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Holley, A. T., Ito, T. M., Liu, C. Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pattie, R. W., Galvan, A. P., Pitt, M. L., Ramsey, J. C., Russell, R., Saunders, A., Schmid, R., Seestrom, S. J., Sjue, S., Sondheim, W. E., Tatar, E., Tipton, B., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Xu, Y. P., Yan, H., Young, A. R., Yuan, J., Ucna Collaboration, Plaster, B., Rios, R., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Holley, A. T., Ito, T. M., Liu, C. Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pattie, R. W., Galvan, A. P., Pitt, M. L., Ramsey, J. C., Russell, R., Saunders, A., Schmid, R., Seestrom, S. J., Sjue, S., Sondheim, W. E., Tatar, E., Tipton, B., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Xu, Y. P., Yan, H., Young, A. R., Yuan, J., and Ucna Collaboration

Abstract

We present a detailed report of a measurement of the neutron beta-asymmetry parameter A(0), the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2 x 2 pi solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A(0) = -0.11966 +/- 0.00089(-0.00140)(+0.00123), from lambda = g(A)/g(V) = -1.27590 +/- 0.00239(-0.00377)(+0.00331). Complete details of the analysis are presented.

Published
2012
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34. Vectorial velocity filter for ultracold neutrons based on a surface-disordered mirror system

Author

Chizhova, L. A., Rotter, S., Jenke, T., Cronenberg, G., Geltenbort, P., Wautischer, G., Abele, H. Filter H., Burgdörfer, J., Chizhova, L. A., Rotter, S., Jenke, T., Cronenberg, G., Geltenbort, P., Wautischer, G., Abele, H. Filter H., and Burgdörfer, J.

Abstract

We perform classical three-dimensional Monte Carlo simulations of ultracold neutrons scattering through an absorbing-reflecting mirror system in the Earth's gravitational field. We show that the underlying mixed phase space of regular skipping motion and random motion due to disorder scattering can be exploited to realize a vectorial velocity filter for ultracold neutrons. The absorbing-reflecting mirror system proposed allows beams of ultracold neutrons with low angular divergence to be formed. The range of velocity components can be controlled by adjusting the geometric parameters of the system. First experimental tests of its performance are presented. One potential future application is the investigation of transport and scattering dynamics in confined systems downstream of the filter., Comment: 14 pages, 13 figures; final version including additional experimental data

Published
2012
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35. A quantized frequency reference in the short-ranged gravity potential and its application for dark matter and dark energy searches

Author

Jenke, T., Cronenberg, G., Geltenbort, P., Ivanov, A. N., Lauer, T., Lins, T., Schmidt, U., Saul, H., Abele, H., Jenke, T., Cronenberg, G., Geltenbort, P., Ivanov, A. N., Lauer, T., Lins, T., Schmidt, U., Saul, H., and Abele, H.

Abstract

The evidence for the observation of the Higgs spin-0-boson as a manifestation of a scalar field provides the missing corner stone for the standard model of particles (SM). However, the SM fails to explain the non-visible but gravitationally active part of the universe. Its nature is unknown but the confirmation of a scalar Higgs is giving a boost to scalar-field-theories. So far gravity experiments and observations performed at different distances find no deviation from Newton's gravity law. Therefore dark energy must possess a screening mechanism which suppresses the scalar-mediated fifth force. Our line of attack is a novel gravity experiment with neutrons based on a quantum interference technique. The spectroscopic measurement of quantum states on resonances with an external coupling makes this a powerful search for dark matter and dark energy contributions in the universe. Quantum states in the gravity potential are intimately related to other scalar field or spin-0-bosons if they exist. If the reason is that some undiscovered particle interact with a neutron, this results in a measurable energy shift of quantum states in the gravity potential, because for neutrons the screening effect is absent. We use Gravity Resonance Spectroscopy to measure the energy splitting at the highest level of precision, providing a constraint on any possible new interaction. We obtain a sensitivity of 10^-14 eV. We set an experimental limit on any fifth force, in particular on parameter \beta<2x10^9 at n=3 for the scalar chameleon field, which is improved by a factor of 100 compared to our previous experiment and five orders of magnitude better than from precision tests of atomic spectra. The pseudoscalar axion coupling is constrained to gsgp/\hbar c<3x10^-16 at 20\mu m, which is an improvement by a factor of 30. These results indicate that gravity is understood at this improved level of precision., Comment: 18 pages, 2 tables, 12 figures

Published
2012

36. Vectorial velocity filter for ultracold neutrons based on a surface-disordered mirror system

Author

Chizhova, L. A., Rotter, S., Jenke, T., Cronenberg, G., Geltenbort, P., Wautischer, G., Abele, H. Filter H., Burgdörfer, J., Chizhova, L. A., Rotter, S., Jenke, T., Cronenberg, G., Geltenbort, P., Wautischer, G., Abele, H. Filter H., and Burgdörfer, J.

Abstract

We perform classical three-dimensional Monte Carlo simulations of ultracold neutrons scattering through an absorbing-reflecting mirror system in the Earth's gravitational field. We show that the underlying mixed phase space of regular skipping motion and random motion due to disorder scattering can be exploited to realize a vectorial velocity filter for ultracold neutrons. The absorbing-reflecting mirror system proposed allows beams of ultracold neutrons with low angular divergence to be formed. The range of velocity components can be controlled by adjusting the geometric parameters of the system. First experimental tests of its performance are presented. One potential future application is the investigation of transport and scattering dynamics in confined systems downstream of the filter., Comment: 14 pages, 13 figures; final version including additional experimental data

Published
2012
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37. A quantized frequency reference in the short-ranged gravity potential and its application for dark matter and dark energy searches

Author

Jenke, T., Cronenberg, G., Geltenbort, P., Ivanov, A. N., Lauer, T., Lins, T., Schmidt, U., Saul, H., Abele, H., Jenke, T., Cronenberg, G., Geltenbort, P., Ivanov, A. N., Lauer, T., Lins, T., Schmidt, U., Saul, H., and Abele, H.

Abstract

The evidence for the observation of the Higgs spin-0-boson as a manifestation of a scalar field provides the missing corner stone for the standard model of particles (SM). However, the SM fails to explain the non-visible but gravitationally active part of the universe. Its nature is unknown but the confirmation of a scalar Higgs is giving a boost to scalar-field-theories. So far gravity experiments and observations performed at different distances find no deviation from Newton's gravity law. Therefore dark energy must possess a screening mechanism which suppresses the scalar-mediated fifth force. Our line of attack is a novel gravity experiment with neutrons based on a quantum interference technique. The spectroscopic measurement of quantum states on resonances with an external coupling makes this a powerful search for dark matter and dark energy contributions in the universe. Quantum states in the gravity potential are intimately related to other scalar field or spin-0-bosons if they exist. If the reason is that some undiscovered particle interact with a neutron, this results in a measurable energy shift of quantum states in the gravity potential, because for neutrons the screening effect is absent. We use Gravity Resonance Spectroscopy to measure the energy splitting at the highest level of precision, providing a constraint on any possible new interaction. We obtain a sensitivity of 10^-14 eV. We set an experimental limit on any fifth force, in particular on parameter \beta<2x10^9 at n=3 for the scalar chameleon field, which is improved by a factor of 100 compared to our previous experiment and five orders of magnitude better than from precision tests of atomic spectra. The pseudoscalar axion coupling is constrained to gsgp/\hbar c<3x10^-16 at 20\mu m, which is an improvement by a factor of 30. These results indicate that gravity is understood at this improved level of precision., Comment: 18 pages, 2 tables, 12 figures

Published
2012

38. Measurement of the neutron beta-asymmetry parameter A(0) with ultracold neutrons

Author

Physics, Plaster, B., Rios, R., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Holley, A. T., Ito, T. M., Liu, C. Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pattie, R. W., Galvan, A. P., Pitt, M. L., Ramsey, J. C., Russell, R., Saunders, A., Schmid, R., Seestrom, S. J., Sjue, S., Sondheim, W. E., Tatar, E., Tipton, B., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Xu, Y. P., Yan, H., Young, A. R., Yuan, J., Ucna Collaboration, Physics, Plaster, B., Rios, R., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Holley, A. T., Ito, T. M., Liu, C. Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pattie, R. W., Galvan, A. P., Pitt, M. L., Ramsey, J. C., Russell, R., Saunders, A., Schmid, R., Seestrom, S. J., Sjue, S., Sondheim, W. E., Tatar, E., Tipton, B., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Xu, Y. P., Yan, H., Young, A. R., Yuan, J., and Ucna Collaboration

Abstract

We present a detailed report of a measurement of the neutron beta-asymmetry parameter A(0), the parity-violating angular correlation between the neutron spin and the decay electron momentum, performed with polarized ultracold neutrons (UCN). UCN were extracted from a pulsed spallation solid deuterium source and polarized via transport through a 7-T magnetic field. The polarized UCN were then transported through an adiabatic-fast-passage spin-flipper field region, prior to storage in a cylindrical decay volume situated within a 1-T 2 x 2 pi solenoidal spectrometer. The asymmetry was extracted from measurements of the decay electrons in multiwire proportional chamber and plastic scintillator detector packages located on both ends of the spectrometer. From an analysis of data acquired during runs in 2008 and 2009, we report A(0) = -0.11966 +/- 0.00089(-0.00140)(+0.00123), from lambda = g(A)/g(V) = -1.27590 +/- 0.00239(-0.00377)(+0.00331). Complete details of the analysis are presented.

Published
2012

39. The search for the neutron electric dipole moment at the Paul Scherrer Institute

Author

Baker, C.A., Ban, G., Bodek, K., Burghoff, M., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Green, K., Grinten, M.G.D. van der, Gutsmiedl, E., Harris, P.G., Henneck, R., Iaydjiev, P., Ivanov, S.N., Khomutov, N., Kasprzak, Malgorzata, Kirch, K., Kistryn, S., Knappe-Gr̈uneberg, S., Knecht, A., Knowles, Paul E., Kozela, A., Lauss, B., Lefort, T., Lemière, Y., Naviliat-Cuncic, O., Pendlebury, J.M., Pierre, E., Piegsa, F.M., Pignol, G., Quéméner, G., Roccia, S., Schmidt-Wellenburg, P., Shiers, D., Smith, K.F., Schnabel, A., Trahms, L., Weis, Antoine, Zejma, J., Zenner, J., Zsigmond, G., Baker, C.A., Ban, G., Bodek, K., Burghoff, M., Chowdhuri, Z., Daum, M., Fertl, M., Franke, B., Geltenbort, P., Green, K., Grinten, M.G.D. van der, Gutsmiedl, E., Harris, P.G., Henneck, R., Iaydjiev, P., Ivanov, S.N., Khomutov, N., Kasprzak, Malgorzata, Kirch, K., Kistryn, S., Knappe-Gr̈uneberg, S., Knecht, A., Knowles, Paul E., Kozela, A., Lauss, B., Lefort, T., Lemière, Y., Naviliat-Cuncic, O., Pendlebury, J.M., Pierre, E., Piegsa, F.M., Pignol, G., Quéméner, G., Roccia, S., Schmidt-Wellenburg, P., Shiers, D., Smith, K.F., Schnabel, A., Trahms, L., Weis, Antoine, Zejma, J., Zenner, J., and Zsigmond, G.

Abstract

The measurement of the neutron electric dipole moment (nEDM) constrains the contribution of CP-violating terms within both the Standard Model and its extensions. The experiment uses ultracold neutrons (UCN) stored in vacuum at room temperature. This technique provided the last (and best) limit by the RAL/Sussex/ILL collaboration in 2006: dn < 2:9 × 10⁻²⁶ e cm (90% C.L.). We aim to improve the experimental sensitivity by a factor of 5 within 2-3 years, using an upgrade of the same apparatus. We will take advantage of the increased ultracold neutron density at the Paul Scherrer Institute (PSI) and of a new concept including both, external magnetometers and a cohabiting magnetometer. In parallel, a next generation apparatus with two UCN storage chambers and an elaborate magnetic field control is being designed aiming to achieve another order of magnitude increase in sensitivity, allowing us to put a limit as tight as dn < 5 × 10⁻²⁸ e cm (95% C.L.), if not establishing a finite value.

Published
2011

40. Production of ultracold neutrons from cryogenic ²H₂, O₂, and C²H₄ converters

Author

Atchison, F., Blau, B., Bodek, K., Brandt, B. van den, Bryś, T., Daum, M., Fierlinger, P., Geltenbort, P., Hautle, P., Henneck, R., Heule, S., Holley, A., Kasprzak, Malgorzata, Kirch, K., Knecht, A., Konter, J. A., Kuźniak, M., Liu, C.-Y., Pichlmaier, A., Plonka, C., Pokotilovski, Y., Saunders, A., Tortorella, D., Wohlmuther, M., Young, A. R., Zejma, J., Zsigmond, G., Atchison, F., Blau, B., Bodek, K., Brandt, B. van den, Bryś, T., Daum, M., Fierlinger, P., Geltenbort, P., Hautle, P., Henneck, R., Heule, S., Holley, A., Kasprzak, Malgorzata, Kirch, K., Knecht, A., Konter, J. A., Kuźniak, M., Liu, C.-Y., Pichlmaier, A., Plonka, C., Pokotilovski, Y., Saunders, A., Tortorella, D., Wohlmuther, M., Young, A. R., Zejma, J., and Zsigmond, G.

Abstract

Ultracold neutrons (UCN) have been produced using the cold neutron (CN) beam FUNSPIN at SINQ on cryogenic oxygen (O₂), tetradeuteromethane (C²H₄), and deuterium (²H₂) targets. The target cell (40 mm long, fiducial volume about 45 cm³) was operated between room temperature and 8 K and UCN were produced from gaseous, liquid and solid targets. UCN rates have been measured as a convolution of UCN production and transport out of the target and to the detector. At least within the accessible temperature range of this experiment, deuterium outperforms the other materials.

Published
2011

41. Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons

Author

UCNA Collaboration, Liu, J., Mendenhall, M. P., Holley, A. T., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, R., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Ito, T. M., Liu, C. -Y., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Morris, C. L., Pattie Jr., R. W., Galvan, A. Perez, Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Russell, R., Saunders, A., Seestrom, S. J., Sondheim, W. E., Tatar, E., Vogelaar, R. B., VornDick, B., Wrede, C., Yan, H., Young, A. R., UCNA Collaboration, Liu, J., Mendenhall, M. P., Holley, A. T., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, R., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Ito, T. M., Liu, C. -Y., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Morris, C. L., Pattie Jr., R. W., Galvan, A. Perez, Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Russell, R., Saunders, A., Seestrom, S. J., Sondheim, W. E., Tatar, E., Vogelaar, R. B., VornDick, B., Wrede, C., Yan, H., and Young, A. R.

Abstract

A precise measurement of the neutron decay $\beta$-asymmetry $A_0$ has been carried out using polarized ultracold neutrons (UCN) from the pulsed spallation UCN source at the Los Alamos Neutron Science Center (LANSCE). Combining data obtained in 2008 and 2009, we report $A_0 = -0.11966 \pm 0.00089_{-0.00140}^{+0.00123}$, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon $g_A/g_V = -1.27590_{-0.00445}^{+0.00409}$., Comment: 5 pages, 2 figures

Published
2010
Full Text
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42. Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons

Author

UCNA Collaboration, Liu, J., Mendenhall, M. P., Holley, A. T., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, R., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Ito, T. M., Liu, C. -Y., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Morris, C. L., Pattie Jr., R. W., Galvan, A. Perez, Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Russell, R., Saunders, A., Seestrom, S. J., Sondheim, W. E., Tatar, E., Vogelaar, R. B., VornDick, B., Wrede, C., Yan, H., Young, A. R., UCNA Collaboration, Liu, J., Mendenhall, M. P., Holley, A. T., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, R., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Ito, T. M., Liu, C. -Y., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Morris, C. L., Pattie Jr., R. W., Galvan, A. Perez, Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Russell, R., Saunders, A., Seestrom, S. J., Sondheim, W. E., Tatar, E., Vogelaar, R. B., VornDick, B., Wrede, C., Yan, H., and Young, A. R.

Abstract

A precise measurement of the neutron decay $\beta$-asymmetry $A_0$ has been carried out using polarized ultracold neutrons (UCN) from the pulsed spallation UCN source at the Los Alamos Neutron Science Center (LANSCE). Combining data obtained in 2008 and 2009, we report $A_0 = -0.11966 \pm 0.00089_{-0.00140}^{+0.00123}$, from which we determine the ratio of the axial-vector to vector weak coupling of the nucleon $g_A/g_V = -1.27590_{-0.00445}^{+0.00409}$., Comment: 5 pages, 2 figures

Published
2010
Full Text
View/download PDF

43. Determination of the Axial-Vector Weak Coupling Constant with Ultracold Neutrons

Author

Physics, Liu, J., Mendenhall, M. P., Holley, A. T., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Ito, T. M., Liu, C. Y., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Morris, C. L., Pattie, R. W., Galvan, A. P., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Russell, R., Saunders, A., Seestrom, S. J., Sondheim, W. E., Tatar, E., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Yan, H., Young, A. R., Ucna Collaboration, Physics, Liu, J., Mendenhall, M. P., Holley, A. T., Back, H. O., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clayton, S., Currie, S., Filippone, B. W., Garcia, A., Geltenbort, P., Hickerson, K. P., Hoagland, J., Hogan, G. E., Hona, B., Ito, T. M., Liu, C. Y., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Morris, C. L., Pattie, R. W., Galvan, A. P., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Russell, R., Saunders, A., Seestrom, S. J., Sondheim, W. E., Tatar, E., Vogelaar, R. Bruce, VornDick, B., Wrede, C., Yan, H., Young, A. R., and Ucna Collaboration

Abstract

A precise measurement of the neutron decay beta asymmetry A(0) has been carried out using polarized ultracold neutrons from the pulsed spallation ultracold neutron source at the Los Alamos Neutron Science Center. Combining data obtained in 2008 and 2009, we report A(0) = -0.119 66 +/- 0.000 89(-0.001 40)(+0.001 23), from which we determine the ratio of the axial- vector to vector weak coupling of the nucleon gA/gV = -1.275 90(-0.004 45)(+0.004 09).

Published
2010

44. First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons

Author

Pattie, RW, Anaya, J, Back, HO, Boissevain, JG, Bowles, TJ, Broussard, LJ, Carr, R, Clark, DJ, Currie, S, Du, S, Filippone, BW, Geltenbort, P, Garcia, A, Hawari, A, Hickerson, KP, Hill, R, Hino, M, Hoedl, SA, Hogan, GE, Holley, AT, Ito, TM, Kawai, T, Kirch, K, Kitagaki, S, Lamoreaux, SK, Liu, CY, Liu, J, Makela, M, Mammei, RR, Martin, JW, Melconian, D, Meier, N, Mendenhall, MP, Morris, CL, Mortensen, R, Pichlmaier, A, Pitt, ML, Plaster, B, Ramsey, JC, Rios, R, Sabourov, K, Sallaska, AL, Saunders, A, Schmid, R, Seestrom, S, Servicky, C, Sjue, SKL, Smith, D, Sondheim, WE, Tatar, E, Teasdale, W, Terai, C, Tipton, B, Utsuro, M, Vogelaar, RB, Wehring, BW, Xu, YP, Young, AR, Yuan, J, Pattie, RW, Anaya, J, Back, HO, Boissevain, JG, Bowles, TJ, Broussard, LJ, Carr, R, Clark, DJ, Currie, S, Du, S, Filippone, BW, Geltenbort, P, Garcia, A, Hawari, A, Hickerson, KP, Hill, R, Hino, M, Hoedl, SA, Hogan, GE, Holley, AT, Ito, TM, Kawai, T, Kirch, K, Kitagaki, S, Lamoreaux, SK, Liu, CY, Liu, J, Makela, M, Mammei, RR, Martin, JW, Melconian, D, Meier, N, Mendenhall, MP, Morris, CL, Mortensen, R, Pichlmaier, A, Pitt, ML, Plaster, B, Ramsey, JC, Rios, R, Sabourov, K, Sallaska, AL, Saunders, A, Schmid, R, Seestrom, S, Servicky, C, Sjue, SKL, Smith, D, Sondheim, WE, Tatar, E, Teasdale, W, Terai, C, Tipton, B, Utsuro, M, Vogelaar, RB, Wehring, BW, Xu, YP, Young, AR, and Yuan, J

Abstract

We report the first measurement of an angular correlation parameter in neutron beta decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ~30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2×2pi solenoidal spectrometer. We determine a value for the beta-asymmetry parameter A0=-0.1138±0.0046±0.0021.

Published
2009

45. A small angle neutron scattering (SANS) experiment using very cold neutrons (VCN)

Author

Bleuel, M., Carpenter, J. M., Micklich, B. J., Geltenbort, P., Mishima, K., Shimizu, H. M., Iwashita, Y., Hirota, K., Hino, M., Kennedy, S. J., Lal, J., Bleuel, M., Carpenter, J. M., Micklich, B. J., Geltenbort, P., Mishima, K., Shimizu, H. M., Iwashita, Y., Hirota, K., Hino, M., Kennedy, S. J., and Lal, J.

Published
2009

46. First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons

Author

Physics, Pattie, R. W., Anaya, J., Back, H. O., Boissevain, J. G., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clark, D. J., Currie, S., Du, S., Filippone, B. W., Geltenbort, P., Garcia, A., Hawari, A., Hickerson, K. P., Hill, R., Hino, M., Hoedl, S. A., Hogan, G. E., Holley, A. T., Ito, T. M., Kawai, T., Kirch, K., Kitagaki, S., Lamoreaux, S. K., Liu, C. Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Meier, N., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pichlmaier, A., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Sabourov, K., Sallaska, A. L., Saunders, A., Schmid, R., Seestrom, S. J., Servicky, C., Sjue, S. K. L., Smith, D., Sondheim, W. E., Tatar, E., Teasdale, W., Terai, C., Tipton, B., Utsuro, M., Vogelaar, R. Bruce, Wehring, B. W., Xu, Y. P., Young, A. R., Yuan, J., Ucna Collaboration, Physics, Pattie, R. W., Anaya, J., Back, H. O., Boissevain, J. G., Bowles, T. J., Broussard, L. J., Carr, Rachel E., Clark, D. J., Currie, S., Du, S., Filippone, B. W., Geltenbort, P., Garcia, A., Hawari, A., Hickerson, K. P., Hill, R., Hino, M., Hoedl, S. A., Hogan, G. E., Holley, A. T., Ito, T. M., Kawai, T., Kirch, K., Kitagaki, S., Lamoreaux, S. K., Liu, C. Y., Liu, J., Makela, M., Mammei, R. R., Martin, J. W., Melconian, D., Meier, N., Mendenhall, M. P., Morris, C. L., Mortensen, R., Pichlmaier, A., Pitt, M. L., Plaster, B., Ramsey, J. C., Rios, R., Sabourov, K., Sallaska, A. L., Saunders, A., Schmid, R., Seestrom, S. J., Servicky, C., Sjue, S. K. L., Smith, D., Sondheim, W. E., Tatar, E., Teasdale, W., Terai, C., Tipton, B., Utsuro, M., Vogelaar, R. Bruce, Wehring, B. W., Xu, Y. P., Young, A. R., Yuan, J., and Ucna Collaboration

Abstract

We report the first measurement of an angular correlation parameter in neutron beta decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for similar to 30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2 x 2 pi solenoidal spectrometer. We determine a value for the beta-asymmetry parameter A(0) = -0.1138 +/- 0.0046 +/- 0.0021.

Published
2009

47. Neutron to mirror-neutron oscillations in the presence of mirror magnetic fields

Author

Altarev, I., Baker, C. A., Ban, G., Bodek, K., Daum, M., Fierlinger, P., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Gutsmiedl, E., Harris, P. G., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S., Khomutov, N., Kirch, K., Kistryn, S., Knecht, A., Knowles, Paul E., Kozela, A., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Paul, S., Pazgalev, Anatoly, Pendlebury, J. M., Petzoldt, G., Pierre, E., Plonka-Spehr, C., Quéméner, G., Rebreyend, D., Roccia, S., Rogel, G., Severijns, N., Shiers, D., Sobolev, Yu., Stoepler, R., Weis, Antoine, Zejma, J., Zenner, J., Zsigmond, G., Altarev, I., Baker, C. A., Ban, G., Bodek, K., Daum, M., Fierlinger, P., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Gutsmiedl, E., Harris, P. G., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S., Khomutov, N., Kirch, K., Kistryn, S., Knecht, A., Knowles, Paul E., Kozela, A., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Paul, S., Pazgalev, Anatoly, Pendlebury, J. M., Petzoldt, G., Pierre, E., Plonka-Spehr, C., Quéméner, G., Rebreyend, D., Roccia, S., Rogel, G., Severijns, N., Shiers, D., Sobolev, Yu., Stoepler, R., Weis, Antoine, Zejma, J., Zenner, J., and Zsigmond, G.

Abstract

We performed ultracold neutron storage measurements to search for additional losses due to neutron (n) to mirror-neutron (n') oscillations as a function of an applied magnetic field B. In the presence of a mirror magnetic field B', ultracold neutron losses would be maximal for B~B'. We did not observe any indication for nn' oscillations and placed a lower limit on the oscillation time of taunn'>12.0 s at 95% C.L. for any B' between 0 and 12.5 µT.

Published
2009

48. Test of Lorentz invariance with spin precession of ultracold neutrons

Author

Altarev, I., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Daum, M., Fierlinger, P., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Gutsmiedl, E., Harris, P. G., Heil, W., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S. N., Khomutov, N., Kirch, K., Kistryn, S., Knecht, A., Knowles, Paul E., Kozela, A., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Pazgalev, Anatoly, Pendlebury, J. M., Petzoldt, G., Pierre, E., Pignol, G., Quéméner, G., Rebetez, Martin, Rebreyend, D., Roccia, S., Rogel, G., Severijns, N., Shiers, D., Sobolev, Yu., Weis, Antoine, Zejma, J., Zsigmond, G., Altarev, I., Baker, C. A., Ban, G., Bison, Georg, Bodek, K., Daum, M., Fierlinger, P., Geltenbort, P., Green, K., Grinten, M. G. D. van der, Gutsmiedl, E., Harris, P. G., Heil, W., Henneck, R., Horras, M., Iaydjiev, P., Ivanov, S. N., Khomutov, N., Kirch, K., Kistryn, S., Knecht, A., Knowles, Paul E., Kozela, A., Kuchler, F., Kuźniak, M., Lauer, T., Lauss, B., Lefort, T., Mtchedlishvili, A., Naviliat-Cuncic, O., Pazgalev, Anatoly, Pendlebury, J. M., Petzoldt, G., Pierre, E., Pignol, G., Quéméner, G., Rebetez, Martin, Rebreyend, D., Roccia, S., Rogel, G., Severijns, N., Shiers, D., Sobolev, Yu., Weis, Antoine, Zejma, J., and Zsigmond, G.

Abstract

A clock comparison experiment, analyzing the ratio of spin precession frequencies of stored ultracold neutrons and ¹⁹⁹Hg atoms, is reported. No daily variation of this ratio could be found, from which is set an upper limit on the Lorentz invariance violating cosmic anisotropy field b⊥<2×10⁻²⁰ eV (95% C.L.). This is the first limit for the free neutron. This result is also interpreted as a direct limit on the gravitational dipole moment of the neutron |gn|<0.3 eV/c² m from a spin-dependent interaction with the Sun. Analyzing the gravitational interaction with the Earth, based on previous data, yields a more stringent limit |gn|<3×10⁻⁴ eV/c² m

Published
2009

49. First Measurement of the Neutron beta Asymmetry with Ultracold Neutrons

Author

70314292, Pattie, RW, Anaya, J, Back, HO, Boissevain, JG, Bowles, TJ, Broussard, LJ, Carr, R, Clark, DJ, Currie, S, Du, S, Filippone, BW, Geltenbort, P, Garcia, A, Hawari, A, Hickerson, KP, Hill, R, Hino, M, Hoedl, SA, Hogan, GE, Holley, AT, Ito, TM, Kawai, T, Kirch, K, Kitagaki, S, Lamoreaux, SK, Liu, CY, Liu, J, Makela, M, Mammei, RR, Martin, JW, Melconian, D, Meier, N, Mendenhall, MP, Morris, CL, Mortensen, R, Pichlmaier, A, Pitt, ML, Plaster, B, Ramsey, JC, Rios, R, Sabourov, K, Sallaska, AL, Saunders, A, Schmid, R, Seestrom, S, Servicky, C, Sjue, SKL, Smith, D, Sondheim, WE, Tatar, E, Teasdale, W, Terai, C, Tipton, B, Utsuro, M, Vogelaar, RB, Wehring, BW, Xu, YP, Young, AR, Yuan, J, 70314292, Pattie, RW, Anaya, J, Back, HO, Boissevain, JG, Bowles, TJ, Broussard, LJ, Carr, R, Clark, DJ, Currie, S, Du, S, Filippone, BW, Geltenbort, P, Garcia, A, Hawari, A, Hickerson, KP, Hill, R, Hino, M, Hoedl, SA, Hogan, GE, Holley, AT, Ito, TM, Kawai, T, Kirch, K, Kitagaki, S, Lamoreaux, SK, Liu, CY, Liu, J, Makela, M, Mammei, RR, Martin, JW, Melconian, D, Meier, N, Mendenhall, MP, Morris, CL, Mortensen, R, Pichlmaier, A, Pitt, ML, Plaster, B, Ramsey, JC, Rios, R, Sabourov, K, Sallaska, AL, Saunders, A, Schmid, R, Seestrom, S, Servicky, C, Sjue, SKL, Smith, D, Sondheim, WE, Tatar, E, Teasdale, W, Terai, C, Tipton, B, Utsuro, M, Vogelaar, RB, Wehring, BW, Xu, YP, Young, AR, and Yuan, J

Abstract

We report the first measurement of an angular correlation parameter in neutron beta decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, which we guide and store for ~30 s in a Cu decay volume. The interaction of the neutron magnetic dipole moment with a static 7 T field external to the decay volume provides a 420 neV potential energy barrier to the spin state parallel to the field, polarizing the UCN before they pass through an adiabatic fast passage spin flipper and enter a decay volume, situated within a 1 T field in a 2×2pi solenoidal spectrometer. We determine a value for the beta-asymmetry parameter A0=-0.1138±0.0046±0.0021.

Published
2009

50. A small angle neutron scattering (SANS) experiment using very cold neutrons (VCN)

Author

00144387, 70314292, Bleuel, M., Carpenter, J. M., Micklich, B. J., Geltenbort, P., Mishima, K., Shimizu, H. M., Iwashita, Y., Hirota, K., Hino, M., Kennedy, S. J., Lal, J., 00144387, 70314292, Bleuel, M., Carpenter, J. M., Micklich, B. J., Geltenbort, P., Mishima, K., Shimizu, H. M., Iwashita, Y., Hirota, K., Hino, M., Kennedy, S. J., and Lal, J.

Published
2009

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