Search

Your search keyword '"Baessler, S."' showing total 211 results
Start Over Author "Baessler, S."
211 results on '"Baessler, S."'

1. The 3He(\vec n,p)3H parity-conserving asymmetry

Author

Viviani, M., Baeßler, S., Barrón-Palos, L., Birge, N., Bowman, J. D., Calarco, J., Cianciolo, V., Coppola, C. E., Crawford, C. B., Dodson, G., Fomin, N., Garishvili, I., Gericke, M. T., Girlanda, L., Greene, G. L., Hale, G. M., Hamblen, J., Hayes, C., Iverson, E. B., Kabir, M. L., Kievsky, A., Marcucci, L. E., McCrea, M., Plemons, E., Ramírez-Morales, A., Mueller, P. E., Novikov, I., Penttila, S. I., Scott, E. M., Watts, J., and Wickersham, C.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Recently, the n$^3$He collaboration reported a measurement of the parity-violating (PV) proton directional asymmetry $A_{\mathrm {PV}} = (1.55\pm 0.97~\mathrm {(st\ at)} \pm 0.24~\mathrm {(sys)})\times 10^{-8}$ in the capture reaction of ${}^3$He$(\vec {n},{\mathrm p}){}^3$H at meV incident neutron energies. The result increased the limited inventory of precisely measured and calculable PV observables in few-body systems required to further understand the structure of hadronic weak interaction. In this letter, we report the experimental and theoretical investigation of a parity conserving (PC) asymmetry $A_{\mathrm {PC}}$ in the same reaction (the first ever measured PC observable at meV neutron energies). As a result of S- and P-wave mixing in the reaction, the $A_{\mathrm {PC}}$ is inversely proportional to the neutron wavelength $\lambda$. The experimental value is $(\lambda\times A_{\mathrm {PC}})\equiv\beta= (-1.97 \pm 0.28~\mathrm{(stat)}\pm 0.12~\mathrm{(sys)}) \times 10^{-6}$ Amstrongs. We present results for a theoretical analysis of this reaction by solving the four-body scattering problem within the hyperspherical harmonic method. We find that in the ${}^3$He$(\vec {n},{\mathrm p}){}^3$H reaction, $A_{\mathrm {PC}}$ depends critically on the energy and width of the close $0^-$ resonant state of ${}^4$He, resulting in a large sensitivity to the spin-orbit components of the nucleon-nucleon force and even to the three-nucleon force. The analysis of the accurately measured $A_{\mathrm {PC}}$ and $A_{\mathrm {PV}}$ using the same few-body theoretical models gives essential information needed to interpret the PV asymmetry in the ${}^3$He$(\vec {n}, {\mathrm p}){}^3$H reaction., Comment: 8 pages, 3 figures

Published
2024

2. Detailed Report on the Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

Author

Aguillard, D. P., Albahri, T., Allspach, D., Anisenkov, A., Badgley, K., Baeßler, S., Bailey, I., Bailey, L., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Barzi, E., Bedeschi, F., Berz, M., Bhattacharya, M., Binney, H. P., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Braun, S., Bressler, M., Cantatore, G., Carey, R. M., Casey, B. C. K., Cauz, D., Chakraborty, R., Chapelain, A., Chappa, S., Charity, S., Chen, C., Cheng, M., Chislett, R., Chu, Z., Chupp, T. E., Claessens, C., Convery, M. E., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., Debevec, P. T., Di Falco, S., Di Sciascio, G., Donati, S., Drendel, B., Driutti, A., Duginov, V. N., Eads, M., Edmonds, A., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fienberg, A. T., Fioretti, A., Flay, D., Foster, S. B., Friedsam, H., Froemming, N. S., Gabbanini, C., Gaines, I., Galati, M. D., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Goodenough, L., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Han, F., Hempstead, J., Hertzog, D. W., Hesketh, G., Hess, E., Hibbert, A., Hodge, Z., Hong, K. W., Hong, R., Hu, T., Hu, Y., Iacovacci, M., Incagli, M., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D. S., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kinnaird, N., Kraegeloh, E., Krylov, V. A., Kuchinskiy, N. A., Labe, K. R., LaBounty, J., Lancaster, M., Lee, S., Li, B., Li, D., Li, L., Logashenko, I., Campos, A. Lorente, Lu, Z., Lucà, A., Lukicov, G., Lusiani, A., Lyon, A. L., MacCoy, B., Madrak, R., Makino, K., Mastroianni, S., Miller, J. P., Miozzi, S., Mitra, B., Morgan, J. P., Morse, W. M., Mott, J., Nath, A., Ng, J. K., Nguyen, H., Oksuzian, Y., Omarov, Z., Osofsky, R., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Počanić, D., Pohlman, N., Polly, C. C., Price, J., Quinn, B., Qureshi, M. U. H., Ramachandran, S., Ramberg, E., Reimann, R., Roberts, B. L., Rubin, D. L., Sakurai, M., Santi, L., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Shemyakin, D., Sorbara, M., Stapleton, J., Still, D., Stöckinger, D., Stoughton, C., Stratakis, D., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Volnykh, V. P., Walton, T., Weisskopf, A., Welty-Rieger, L., Winter, P., Wu, Y., Yu, B., Yucel, M., Zeng, Y., and Zhang, C.

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment
Abstract

We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based on positive muon data taken at Fermilab's Muon Campus during the 2019 and 2020 accelerator runs. The measurement uses $3.1$ GeV$/c$ polarized muons stored in a $7.1$-m-radius storage ring with a $1.45$ T uniform magnetic field. The value of $ a_{\mu}$ is determined from the measured difference between the muon spin precession frequency and its cyclotron frequency. This difference is normalized to the strength of the magnetic field, measured using Nuclear Magnetic Resonance (NMR). The ratio is then corrected for small contributions from beam motion, beam dispersion, and transient magnetic fields. We measure $a_\mu = 116 592 057 (25) \times 10^{-11}$ (0.21 ppm). This is the world's most precise measurement of this quantity and represents a factor of $2.2$ improvement over our previous result based on the 2018 dataset. In combination, the two datasets yield $a_\mu(\text{FNAL}) = 116 592 055 (24) \times 10^{-11}$ (0.20 ppm). Combining this with the measurements from Brookhaven National Laboratory for both positive and negative muons, the new world average is $a_\mu$(exp) $ = 116 592 059 (22) \times 10^{-11}$ (0.19 ppm)., Comment: 48 pages, 29 figures; 4 pages of Supplement Material; version accepted for publication in Physical Review D

Published
2024

3. Reanalysis of the $\beta - \bar{\nu_e}$ Angular Correlation Measurement from the aSPECT Experiment with New Constraints on Fierz Interference

Author

Beck, M., Heil, W., Schmidt, C., Baeßler, S., Glück, F., Konrad, G., and Schmidt, U.

Subjects
Nuclear Experiment
Abstract

On the basis of revisions of some of the systematic errors, we reanalyzed the electron-antineutrino angular correlation ($a$ coefficient) in free neutron decay inferred from the recoil energy spectrum of the protons which are detected in 4$\pi$ by the aSPECT spectrometer. With $a = -0.10402(82)$ the new value differs only marginally from the one published in 2020. The experiment also has sensitivity to $b$, the Fierz interference term. From a correlated $(b,a)$ fit to the proton recoil spectrum, we derive a limit of $b = -0.0098(193)$ which translates into a somewhat improved 90 \% CL region of $-0.041 \leq b \leq 0.022$ on this hypothetical term. Tighter constraints on $b$ can be set from a combined$^{(c)}$ analysis of the PERKEO~III ($\beta$ asymmetry) and aSPECT measurement which suggests a finite value of $b$ with $b^{(c)}$ = -0.0181 $\pm$ 0.0065 deviating by 2.82$\sigma$ from the standard model., Comment: 8 pages, 5 figures. arXiv admin note: text overlap with arXiv:1908.04785

Published
2023

4. Fundamental Neutron Physics: a White Paper on Progress and Prospects in the US

Author

Alarcon, R., Aleksandrova, A., Baeßler, S., Beck, D. H., Bhattacharya, T., Blatnik, M., Bowles, T. J., Bowman, J. D., Brewington, J., Broussard, L. J., Bryant, A., Burdine, J. F., Caylor, J., Chen, Y., Choi, J. H., Christie, L., Chupp, T. E., Cianciolo, V., Cirigliano, V., Clayton, S. M., Collett, B., Crawford, C., Dekens, W., Demarteau, M., DeMille, D., Dodson, G., Filippone, B. W., Floyd, N., Fomin, N., Fry, J, Fuyuto, K., Gardner, S., Godri, R., Golub, R., Gonzalez, F., Greene, G. L., Gudkov, V., Gupta, R., Hamblen, J., Hayen, L., Hendrus, J C., Hickerson, K., Hills, F. B., Holley, A. T., Hoogerheide, S., Hubert, M., Huffman, P. R., Imam, S. K., Ito, T. M., Jin, L., Jones, G., Komives, A., Korobkina, E., Korsch, W., Leung, K. K. H., Liu, C. -Y., Liu, K. -F., Long, J. C., Mathews, D., Mendelsohn, A., Mereghetti, E., Mohanmurthy, P., Morris, C. L., Mueller, P., Mumm, H. P., Nelsen, A., Nicholson, A., Nico, J., O'Shaughnessy, C. M., Palamure, P. A., Pastore, S., Pattie Jr., R. W., Phan, N. S., Pioquinto, J. A., Plaster, B., Počanić, D., Rahangdale, H., Redwine, R., Reid, A., Salvat, D. J., Saunders, A., Schaper, D., Seng, C. -Y., Singh, M., Shindler, A., Snow, W. M., Tang, Z., Walker-Loud, A., Wong, D. K. -T., Wietfeldt, F., and Young, A. R.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Fundamental neutron physics, combining precision measurements and theory, probes particle physics at short range with reach well beyond the highest energies probed by the LHC. Significant US efforts are underway that will probe BSM CP violation with orders of magnitude more sensitivity, provide new data on the Cabibbo anomaly, more precisely measure the neutron lifetime and decay, and explore hadronic parity violation. World-leading results from the US Fundamental Neutron Physics community since the last Long Range Plan, include the world's most precise measurement of the neutron lifetime from UCN$\tau$, the final results on the beta-asymmetry from UCNA and new results on hadronic parity violation from the NPDGamma and n-${^3}$He runs at the FNPB (Fundamental Neutron Physics Beamline), precision measurement of the radiative neutron decay mode and n-${}^4$He at NIST. US leadership and discovery potential are ensured by the development of new high-impact experiments including BL3, Nab, LANL nEDM and nEDM@SNS. On the theory side, the last few years have seen results for the neutron EDM from the QCD $\theta$ term, a factor of two reduction in the uncertainty for inner radiative corrections in beta-decay which impacts CKM unitarity, and progress on {\it ab initio} calculations of nuclear structure for medium-mass and heavy nuclei which can eventually improve the connection between nuclear and nucleon EDMs. In order to maintain this exciting program and capitalize on past investments while also pursuing new ideas and building US leadership in new areas, the Fundamental Neutron Physics community has identified a number of priorities and opportunities for our sub-field covering the time-frame of the last Long Range Plan (LRP) under development. This white paper elaborates on these priorities., Comment: arXiv admin note: text overlap with arXiv:2304.03451

Published
2023

5. Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

Author

Aguillard, D. P., Albahri, T., Allspach, D., Anisenkov, A., Badgley, K., Baeßler, S., Bailey, I., Bailey, L., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Barzi, E., Bedeschi, F., Berz, M., Bhattacharya, M., Binney, H. P., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Braun, S., Bressler, M., Cantatore, G., Carey, R. M., Casey, B. C. K., Cauz, D., Chakraborty, R., Chapelain, A., Chappa, S., Charity, S., Chen, C., Cheng, M., Chislett, R., Chu, Z., Chupp, T. E., Claessens, C., Convery, M. E., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., Debevec, P. T., Di Falco, S., Di Sciascio, G., Drendel, B., Driutti, A., Duginov, V. N., Eads, M., Edmonds, A., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fienberg, A. T., Fioretti, A., Flay, D., Foster, S. B., Friedsam, H., Froemming, N. S., Gabbanini, C., Gaines, I., Galati, M. D., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Goodenough, L., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Han, F., Hempstead, J., Hertzog, D. W., Hesketh, G., Hess, E., Hibbert, A., Hodge, Z., Hong, K. W., Hong, R., Hu, T., Hu, Y., Iacovacci, M., Incagli, M., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D. S., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kinnaird, N., Kraegeloh, E., Krylov, V. A., Kuchinskiy, N. A., Labe, K. R., LaBounty, J., Lancaster, M., Lee, S., Li, B., Li, D., Li, L., Logashenko, I., Campos, A. Lorente, Lu, Z., Lucà, A., Lukicov, G., Lusiani, A., Lyon, A. L., MacCoy, B., Madrak, R., Makino, K., Mastroianni, S., Miller, J. P., Miozzi, S., Mitra, B., Morgan, J. P., Morse, W. M., Mott, J., Nath, A., Ng, J. K., Nguyen, H., Oksuzian, Y., Omarov, Z., Osofsky, R., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Počanić, D., Pohlman, N., Polly, C. C., Price, J., Quinn, B., Qureshi, M. U. H., Ramachandran, S., Ramberg, E., Reimann, R., Roberts, B. L., Rubin, D. L., Santi, L., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Shemyakin, D., Sorbara, M., Stapleton, J., Still, D., Stöckinger, D., Stoughton, C., Stratakis, D., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Volnykh, V. P., Walton, T., Weisskopf, A., Welty-Rieger, L., Winter, P., Wu, Y., Yu, B., Yucel, M., Zeng, Y., and Zhang, C.

Subjects
High Energy Physics - Experiment
Abstract

We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from the Fermilab Muon $g\!-\!2$ Experiment using data collected in 2019 and 2020. We have analyzed more than 4 times the number of positrons from muon decay than in our previous result from 2018 data. The systematic error is reduced by more than a factor of 2 due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, $\tilde{\omega}'^{}_p$, and of the anomalous precession frequency corrected for beam dynamics effects, $\omega_a$. From the ratio $\omega_a / \tilde{\omega}'^{}_p$, together with precisely determined external parameters, we determine $a_\mu = 116\,592\,057(25) \times 10^{-11}$ (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain $a_\mu\text{(FNAL)} = 116\,592\,055(24) \times 10^{-11}$ (0.20 ppm). The new experimental world average is $a_\mu (\text{Exp}) = 116\,592\,059(22)\times 10^{-11}$ (0.19 ppm), which represents a factor of 2 improvement in precision., Comment: 8 pages, 3 figures

Published
2023
Full Text
View/download PDF

6. Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan

Author

Acharya, B., Adams, C., Aleksandrova, A. A., Alfonso, K., An, P., Baeßler, S., Balantekin, A. B., Barbeau, P. S., Bellini, F., Bellini, V., Beminiwattha, R. S., Bernauer, J. C., Bhattacharya, T., Bishof, M., Bolotnikov, A. E., Breur, P. A., Brodeur, M., Brodsky, J. P., Broussard, L. J., Brunner, T., Burdette, D. P., Caylor, J., Chiu, M., Cirigliano, V., Clark, J. A., Clayton, S. M., Daniels, T. V., Darroch, L., Davoudi, Z., de Gouvêa, A., Dekens, W., Demarteau, M., DeMille, D., Deshpande, A., Detwiler, J. A., Dodson, G. W., Dolinski, M. J., Elliott, S. R., Engel, J., Erler, J., Filippone, B. W., Fomin, N., Formaggio, J. A., Friesen, F. Q. L., Fry, J., Fujikawa, B. K., Fuller, G., Fuyuto, K., Gallant, A. T., Gallina, G., Ruiz, A. Garcia, Ruiz, R. F. Garcia, Gardner, S., Gonzalez, F. M., Gratta, G., Gruszko, J., Gudkov, V., Guiseppe, V. E., Gutierrez, T. D., Hansen, E. V., Hardy, C. A., Haxton, W. C., Hayen, L., Hedges, S., Heeger, K. M., Heffner, M., Heise, J., Henning, R., Hergert, H., Hertzog, D. W., Aguilar, D. Hervas, Holt, J. D., Hoogerheide, S. F., Hoppe, E. W., Horoi, M., Howell, C. R., Huang, M., Hutzler, N. R., Imam, K., Ito, T. M., Jamil, A., Janssens, R. V., Jayich, A. M., Jones, B. J. P., Kammel, P., Liu, K. F., Khachatryan, V., King, P. M., Klein, J. R., Kneller, J. P., Kolomensky, Yu. G., Korsch, W., Krücken, R., Kumar, K. S., Launey, K. D., Lawrence, D., Leach, K. G., Lehnert, B., Lenardo, B. G., Li, Z., Lin, H. -W., Longfellow, B., Lopez-Caceres, S., Lunardini, C., MacLellan, R., Markoff, D. M., Maruyama, R. H., Mathews, D. G., Melconian, D., Mereghetti, E., Mohanmurthy, P., Moore, D. C., Mueller, P. E., Mumm, H. P., Nazarewicz, W., Newby, J., Nicholson, A. N., Novitski, E., Ondze, J. C. Nzobadila, O'Donnell, T., Gann, G. D. Orebi, Orrell, J. L., Ouellet, J. L., Parno, D. S., Paschke, K. D., Pastore, S., Pattie Jr, R. W., Petrov, A. A., Pitt, M. L., Plaster, B., Pocanic, D., Pocar, A., Poon, A. W. P., Radford, D. C., Rahangdale, H., Rasco, B. C., Rasiwala, H., Redwine, R. P., Ritz, A., Rogers, L., Ron, G., Saldanha, R., Sangiorgio, S., Sargsyan, G. H., Saunders, A., Savard, G., Schaper, D. C., Scholberg, K., Scielzo, N. D., Seng, C. -Y., Shindler, A., Singh, J. T., Singh, M., Singh, V., Snow, W. M., Soma, A. K., Souder, P. A., Speller, D. H., Stachurska, J., Surukuchi, P. T., Oregui, B. Tapia, Tomalak, O., Torres, J. A., Tyuka, O. A., VanDevender, B. A., Varriano, L., Vogt, R., Walker-Loud, A., Wamba, K., Watkins, S. L., Wietfeldt, F. E., Williams, W. D., Wilson, J. T., Winslow, L., Yan, X. L., Yang, L., Young, A. R., Zheng, X., and Zhou, Y.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

This whitepaper presents the research priorities decided on by attendees of the 2022 Town Meeting for Fundamental Symmetries, Neutrons and Neutrinos, which took place December 13-15, 2022 in Chapel Hill, NC, as part of the Nuclear Science Advisory Committee (NSAC) 2023 Long Range Planning process. A total of 275 scientists registered for the meeting. The whitepaper makes a number of explicit recommendations and justifies them in detail.

Published
2023

7. Particle Physics at the European Spallation Source

Author

Abele, H., Alekou, A., Algora, A., Andersen, K., Baessler, S., Barron-Palos, L., Barrow, J., Baussan, E., Bentley, P., Berezhiani, Z., Bessler, Y., Bhattacharyya, A. K., Bianchi, A., Bijnens, J., Blanco, C., Kraljevic, N. Blaskovic, Blennow, M., Bodek, K., Bogomilov, M., Bohm, C., Bolling, B., Bouquerel, E., Brooijmans, G., Broussard, L. J., Buchan, O., Burgman, A., Calen, H., Carlile, C. J., Cederkall, J., Chanel, E., Christiansen, P., Cirigliano, V., Collar, J. I., Collins, M., Crawford, C. B., Morales, E. Cristaldo, Cupial, P., D'Alessi, L., Damian, J. I. M., Danared, H., Dancila, D., de Andre, J. P. A. M., Delahaye, J. P., Degenkolb, S., Di Julio, D. D., Dracos, M., Dunne, K., Efthymiopoulos, I., Ekelof, T., Eklund, L., Eshraqi, M., Esteban, I., Fanourakis, G., Farricker, A., Fernandez-Martinez, E., Ferreira, M. J., Fertl, M., Fierlinger, P., Folsom, B., Frank, A., Fratangelo, A., Friman-Gayer, U., Fukuda, T., Fynbo, H . O . U., Sosa, A. Garcia, Gazis, N., Galnander, B., Geralis, Th., Ghosh, M., Gokbulut, G., Gomez-Cadenas, J . J., Gonzalez-Alonso, M., Gonzalez, F., Halic, L., Happe, C., Heil, P., Heinz, A., Herde, H., Holl, M., Jenke, T., Jenssen, M., Jericha, E., Johansson, H. T., Johansson, R., Johansson, T., Kamyshkov, Y., Topaksu, A. Kayis, Kildetoft, B., Kirch, K., Klicek, B., Klinkby, E., Kolevatov, R., Konrad, G., Koziol, M., Krhac, K., Kupsc, A., Lacny, L., Larizgoitia, L., Lewis, C. M., Lindroos, M., Lychagin, E., Lytken, E., Maiano, C., Marciniewski, P., Markaj, G., Markisch, B., Marrelli, C., Martins, C., Meirose, B., Mezzetto, M., Milas, N., Milstead, D., Monrabal, F., Muhrer, G., Nepomuceno, A., Nesvizhevsky, V., Nilsson, T., Novella, P., Oglakci, M., Ohlsson, T., Olvegard, M., Oskarsson, A., Ota, T., Park, J., Patrzalek, D., Perrey, H., Persoz, M., Petkov, G., Piegsa, F. M., Pistillo, C., Poussot, P., Privitera, P., Rataj, B., Ries, D., Rizzi, N., Rosauro-Alcaraz, S., Rozpedzik, D., Saiang, D., Santoro, V., Schmidt, U., Schober, H., Schulthess, I., Silverstein, S., Simon, A., Sina, H., Snamina, J., Snow, W. M., Soldner, T., Stavropoulos, G., Stipcevic, M., Szybinski, B., Takibayev, A., Tang, Z., Tarkeshian, R., Theroine, C., Thorne, J., Terranova, F., Thomas, J., Tolba, T., Torres-Sanchez, P., Trachanas, E., Tsenov, R., Uggerhoj, U. I., Vankova-Kirilova, G., Vassilopoulos, N., Wagner, R., Wang, X., Wildner, E., Wolke, M., Wurtz, J., Yiu, S. C., Yoon, S. G., Young, A. R., Zanini, L., Zejma, J., Zerzion, D., Zimmer, O., Zormpa, O., and Zou, Y.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment
Abstract

Presently under construction in Lund, Sweden, the European Spallation Source (ESS) will be the world's brightest neutron source. As such, it has the potential for a particle physics program with a unique reach and which is complementary to that available at other facilities. This paper describes proposed particle physics activities for the ESS. These encompass the exploitation of both the neutrons and neutrinos produced at the ESS for high precision (sensitivity) measurements (searches)., Comment: 121 pages, updated version after referee comments

Published
2022
Full Text
View/download PDF

8. Measurement of the Parity-Odd Angular Distribution of Gamma Rays From Polarized Neutron Capture on $^{35}$Cl

Author

Fomin, N., Alarcon, R., Alonzi, L., Askanazi, E., Baeßler, S., Balascuta, S., Barrón-Palos, L., Barzilov, A., Blyth, D., Bowman, J. D., Birge, N., Calarco, J. R., Chupp, T. E., Cianciolo, V., Coppola, C. E., Crawford, C. B., Craycraft, K., Evans, D., Fieseler, C., Frlež, E., Fry, J., Garishvili, I., Gericke, M. T. W., Gillis, R. C., Grammer, K. B., Greene, G. L., Hall, J., Hamblen, J., Hayes, C., Iverson, E. B., Kabir, M. L., Kucuker, S., Lauss, B., Mahurin, R., McCrea, M., Maldonado-Velázquez, M., Masuda, Y., Mei, J., Milburn, R., Mueller, P. E., Musgrave, M., Nann, H., Novikov, I., Parsons, D., Penttilä, S. I., Počanić, D., Ramirez-Morales, A., Root, M., Salas-Bacci, A., Santra, S., Schröder, S., Scott, E., Seo, P. -N., Sharapov, E. I., Simmons, F., Snow, W. M., Sprow, A., Stewart, J., Tang, E., Tang, Z., Tong, X., Turkoglu, D. J., Whitehead, R., and Wilburn, W. S.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

We report a measurement of two energy-weighted gamma cascade angular distributions from polarized slow neutron capture on the ${}^{35}$Cl nucleus, one parity-odd correlation proportional to $\vec{s_{n}} \cdot \vec{k_{\gamma}}$ and one parity-even correlation proportional to $\vec{s_{n}} \cdot \vec{k_{n}} \times \vec{k_{\gamma}}$. A parity violating asymmetry can appear in this reaction due to the weak nucleon-nucleon (NN) interaction which mixes opposite parity S and P-wave levels in the excited compound $^{36}$Cl nucleus formed upon slow neutron capture. If parity-violating (PV) and parity-conserving (PC) terms both exist, the measured differential cross section can be related to them via $\frac{d\sigma}{d\Omega}\propto1+A_{\gamma, PV}\cos\theta+A_{\gamma,PC}\sin\theta$. The PV and PC asymmetries for energy-weighted gamma cascade angular distributions for polarized slow neutron capture on $^{35}$Cl averaged over the neutron energies from 2.27~meV to 9.53~meV were measured to be $A_{\gamma,PV}=(-23.9\pm0.7)\times 10^{-6}$ and $A_{\gamma,PC}=(0.1\pm0.7)\times 10^{-6}$. These results are consistent with previous experimental results. Systematic errors were quantified and shown to be small compared to the statistical error. These asymmetries in the angular distributions of the gamma rays emitted from the capture of polarized neutrons in $^{35}$Cl were used to verify the operation and data analysis procedures for the NPDGamma experiment which measured the parity-odd asymmetry in the angular distribution of gammas from polarized slow neutron capture on protons.

Published
2022
Full Text
View/download PDF

9. Measurement of the anomalous precession frequency of the muon in the Fermilab Muon g-2 experiment

Author

Albahri, T., Anastasi, A., Anisenkov, A., Badgley, K., Baeßler, S., Bailey, I., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Basti, A., Bedeschi, F., Berz, M., Bhattacharya, M., Binney, H. P., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Cantatore, G., Carey, R. M., Casey, B. C. K., Cauz, D., Chakraborty, R., Chang, S. P., Chapelain, A., Charity, S., Chislett, R., Choi, J., Chu, Z., Chupp, T. E., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., Debevec, P. T., Di Falco, S., Di Meo, P., Di Sciascio, G., Di Stefano, R., Driutti, A., Duginov, V. N., Eads, M., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fienberg, A. T., Fioretti, A., Flay, D., Frlež, E., Froemming, N. S., Fry, J., Gabbanini, C., Galati, M. D., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Han, F., Hempstead, J., Herrod, A. T., Hertzog, D. W., Hesketh, G., Hibbert, A., Hodge, Z., Holzbauer, J. L., Hong, K. W., Hong, R., Iacovacci, M., Incagli, M., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kim, Y. I., King, B., Kinnaird, N., Kraegeloh, E., Kuchibhotla, A., Kuchinskiy, N. A., Labe, K. R., LaBounty, J., Lancaster, M., Lee, M. J., Lee, S., Leo, S., Li, B., Li, D., Li, L., Logashenko, I., Campos, A. Lorente, Lucà, A., Lukicov, G., Lusiani, A., Lyon, A. L., MacCoy, B., Madrak, R., Makino, K., Marignetti, F., Mastroianni, S., Miller, J. P., Miozzi, S., Morse, W. M., Mott, J., Nath, A., Nguyen, H., Osofsky, R., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Počanić, D., Pohlman, N., Polly, C. C., Price, J., Quinn, B., Raha, N., Ramachandran, S., Ramberg, E., Ritchie, J. L., Roberts, B. L., Rubin, D. L., Santi, L., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Shemyakin, D., Smith, M. W., Sorbara, M., Stöckinger, D., Stapleton, J., Stoughton, C., Stratakis, D., Stuttard, T., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Thomson, K., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Walton, T., Weisskopf, A., Welty-Rieger, L., Winter, P., Wolski, A., and Wu, W.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The Muon g-2 Experiment at Fermi National Accelerator Laboratory (FNAL) has measured the muon anomalous precession frequency $\omega_a$ to an uncertainty of 434 parts per billion (ppb), statistical, and 56 ppb, systematic, with data collected in four storage ring configurations during its first physics run in 2018. When combined with a precision measurement of the magnetic field of the experiment's muon storage ring, the precession frequency measurement determines a muon magnetic anomaly of $a_{\mu}({\rm FNAL}) = 116\,592\,040(54) \times 10^{-11}$ (0.46 ppm). This article describes the multiple techniques employed in the reconstruction, analysis and fitting of the data to measure the precession frequency. It also presents the averaging of the results from the eleven separate determinations of \omega_a, and the systematic uncertainties on the result., Comment: 29 pages, 19 figures. Published in Physical Review D

Published
2021
Full Text
View/download PDF

10. Magnetic Field Measurement and Analysis for the Muon g-2 Experiment at Fermilab

Author

Albahri, T., Anastasi, A., Badgley, K., Baeßler, S., Bailey, I., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Bedeschi, F., Berz, M., Bhattacharya, M., Binney, H. P., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Cantatore, G., Carey, R. M., Casey, B. C. K., Cauz, D., Chakraborty, R., Chang, S. P., Chapelain, A., Charity, S., Chislett, R., Choi, J., Chu, Z., Chupp, T. E., Conway, A., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., Debevec, P. T., Di Falco, S., Di Meo, P., Di Sciascio, G., Di Stefano, R., Driutti, A., Duginov, V. N., Eads, M., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fienberg, A. T., Fioretti, A., Flay, D., Froemming, N. S., Gabbanini, C., Galati, M. D., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Han, F., Hempstead, J., Herrod, A. T., Hertzog, D. W., Hesketh, G., Hibbert, A., Hodge, Z., Holzbauer, J. L., Hong, K. W., Hong, R., Iacovacci, M., Incagli, M., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kim, Y. I., King, B., Kinnaird, N., Kraegeloh, E., Kuchinskiy, N. A., Labe, K. R., LaBounty, J., Lancaster, M., Lee, M. J., Lee, S., Li, B., Li, D., Li, L., Logashenko, I., Campos, A. Lorente, Lucà, A., Lukicov, G., Lusiani, A., Lyon, A. L., MacCoy, B., Madrak, R., Makino, K., Marignetti, F., Mastroianni, S., Miller, J. P., Miozzi, S., Morse, W. M., Mott, J., Nath, A., Nguyen, H., Osofsky, R., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Počanić, D., Pohlman, N., Polly, C. C., Price, J., Quinn, B., Raha, N., Ramachandran, S., Ramberg, E., Ritchie, J. L., Roberts, B. L., Rubin, D. L., Santi, L., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Shemyakin, D., Smith, M. W., Sorbara, M., Stöckinger, D., Stapleton, J., Stoughton, C., Stratakis, D., Stuttard, T., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Thomson, K., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Walton, T., Weisskopf, A., Welty-Rieger, L., Winter, P., Wolski, A., and Wu, W.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The Fermi National Accelerator Laboratory has measured the anomalous precession frequency $a^{}_\mu = (g^{}_\mu-2)/2$ of the muon to a combined precision of 0.46 parts per million with data collected during its first physics run in 2018. This paper documents the measurement of the magnetic field in the muon storage ring. The magnetic field is monitored by nuclear magnetic resonance systems and calibrated in terms of the equivalent proton spin precession frequency in a spherical water sample at 34.7$^\circ$C. The measured field is weighted by the muon distribution resulting in $\tilde{\omega}'^{}_p$, the denominator in the ratio $\omega^{}_a$/$\tilde{\omega}'^{}_p$ that together with known fundamental constants yields $a^{}_\mu$. The reported uncertainty on $\tilde{\omega}'^{}_p$ for the Run-1 data set is 114 ppb consisting of uncertainty contributions from frequency extraction, calibration, mapping, tracking, and averaging of 56 ppb, and contributions from fast transient fields of 99 ppb., Comment: Added one citation and corrected missing normalization in Eqs (35) and (36)

Published
2021
Full Text
View/download PDF

11. Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm

Author

Abi, B., Albahri, T., Al-Kilani, S., Allspach, D., Alonzi, L. P., Anastasi, A., Anisenkov, A., Azfar, F., Badgley, K., Baeßler, S., Bailey, I., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Barzi, E., Basti, A., Bedeschi, F., Behnke, A., Berz, M., Bhattacharya, M., Binney, H. P., Bjorkquist, R., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Boyden, D., Cantatore, G., Carey, R. M., Carroll, J., Casey, B. C. K., Cauz, D., Ceravolo, S., Chakraborty, R., Chang, S. P., Chapelain, A., Chappa, S., Charity, S., Chislett, R., Choi, J., Chu, Z., Chupp, T. E., Convery, M. E., Conway, A., Corradi, G., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., De Lurgio, P. M., Debevec, P. T., Di Falco, S., Di Meo, P., Di Sciascio, G., Di Stefano, R., Drendel, B., Driutti, A., Duginov, V. N., Eads, M., Eggert, N., Epps, A., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fiedler, A., Fienberg, A. T., Fioretti, A., Flay, D., Foster, S. B., Friedsam, H., Frlež, E., Froemming, N. S., Fry, J., Fu, C., Gabbanini, C., Galati, M. D., Ganguly, S., Garcia, A., Gastler, D. E., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Hahn, D., Halewood-Leagas, T., Hampai, D., Han, F., Hazen, E., Hempstead, J., Henry, S., Herrod, A. T., Hertzog, D. W., Hesketh, G., Hibbert, A., Hodge, Z., Holzbauer, J. L., Hong, K. W., Hong, R., Iacovacci, M., Incagli, M., Johnstone, C., Johnstone, J. A., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kim, S. C., Kim, Y. I., King, B., Kinnaird, N., Korostelev, M., Kourbanis, I., Kraegeloh, E., Krylov, V. A., Kuchibhotla, A., Kuchinskiy, N. A., Labe, K. R., LaBounty, J., Lancaster, M., Lee, M. J., Lee, S., Leo, S., Li, B., Li, D., Li, L., Logashenko, I., Campos, A. Lorente, Lucà, A., Lukicov, G., Luo, G., Lusiani, A., Lyon, A. L., MacCoy, B., Madrak, R., Makino, K., Marignetti, F., Mastroianni, S., Maxfield, S., McEvoy, M., Merritt, W., Mikhailichenko, A. A., Miller, J. P., Miozzi, S., Morgan, J. P., Morse, W. M., Mott, J., Motuk, E., Nath, A., Newton, D., Nguyen, H., Oberling, M., Osofsky, R., Ostiguy, J. -F., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Počanić, D., Pohlman, N., Polly, C. C., Popovic, M., Price, J., Quinn, B., Raha, N., Ramachandran, S., Ramberg, E., Rider, N. T., Ritchie, J. L., Roberts, B. L., Rubin, D. L., Santi, L., Sathyan, D., Schellman, H., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Shatunov, Y. M., Shemyakin, D., Shenk, M., Sim, D., Smith, M. W., Smith, A., Soha, A. K., Sorbara, M., Stöckinger, D., Stapleton, J., Still, D., Stoughton, C., Stratakis, D., Strohman, C., Stuttard, T., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Thomson, K., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Volnykh, V. P., Walton, T., Warren, M., Weisskopf, A., Welty-Rieger, L., Whitley, M., Winter, P., Wolski, A., Wormald, M., Wu, W., and Yoshikawa, C.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

We present the first results of the Fermilab Muon g-2 Experiment for the positive muon magnetic anomaly $a_\mu \equiv (g_\mu-2)/2$. The anomaly is determined from the precision measurements of two angular frequencies. Intensity variation of high-energy positrons from muon decays directly encodes the difference frequency $\omega_a$ between the spin-precession and cyclotron frequencies for polarized muons in a magnetic storage ring. The storage ring magnetic field is measured using nuclear magnetic resonance probes calibrated in terms of the equivalent proton spin precession frequency ${\tilde{\omega}'^{}_p}$ in a spherical water sample at 34.7$^{\circ}$C. The ratio $\omega_a / {\tilde{\omega}'^{}_p}$, together with known fundamental constants, determines $a_\mu({\rm FNAL}) = 116\,592\,040(54)\times 10^{-11}$ (0.46\,ppm). The result is 3.3 standard deviations greater than the standard model prediction and is in excellent agreement with the previous Brookhaven National Laboratory (BNL) E821 measurement. After combination with previous measurements of both $\mu^+$ and $\mu^-$, the new experimental average of $a_\mu({\rm Exp}) = 116\,592\,061(41)\times 10^{-11}$ (0.35\,ppm) increases the tension between experiment and theory to 4.2 standard deviations, Comment: 10 pages; 4 figures

Published
2021
Full Text
View/download PDF

12. Beam dynamics corrections to the Run-1 measurement of the muon anomalous magnetic moment at Fermilab

Author

Albahri, T., Anastasi, A., Badgley, K., Baeßler, S., Bailey, I., Baranov, V. A., Barlas-Yucel, E., Barrett, T., Bedeschi, F., Berz, M., Bhattacharya, M., Binney, H. P., Bloom, P., Bono, J., Bottalico, E., Bowcock, T., Cantatore, G., Carey, R. M., Casey, B. C. K., Cauz, D., Chakraborty, R., Chang, S. P., Chapelain, A., Charity, S., Chislett, R., Choi, J., Chu, Z., Chupp, T. E., Corrodi, S., Cotrozzi, L., Crnkovic, J. D., Dabagov, S., Debevec, P. T., Di Falco, S., Di Meo, P., Di Sciascio, G., Di Stefano, R., Driutti, A., Duginov, V. N., Eads, M., Esquivel, J., Farooq, M., Fatemi, R., Ferrari, C., Fertl, M., Fiedler, A., Fienberg, A. T., Fioretti, A., Flay, D., Frlež, E., Froemming, N. S., Fry, J., Gabbanini, C., Galati, M. D., Ganguly, S., Garcia, A., George, J., Gibbons, L. K., Gioiosa, A., Giovanetti, K. L., Girotti, P., Gohn, W., Gorringe, T., Grange, J., Grant, S., Gray, F., Haciomeroglu, S., Halewood-Leagas, T., Hampai, D., Han, F., Hempstead, J., Herrod, A. T., Hertzog, D. W., Hesketh, G., Hibbert, A., Hodge, Z., Holzbauer, J. L., Hong, K. W., Hong, R., Iacovacci, M., Incagli, M., Kammel, P., Kargiantoulakis, M., Karuza, M., Kaspar, J., Kawall, D., Kelton, L., Keshavarzi, A., Kessler, D., Khaw, K. S., Khechadoorian, Z., Khomutov, N. V., Kiburg, B., Kiburg, M., Kim, O., Kim, Y. I., King, B., Kinnaird, N., Korostelev, M., Kraegeloh, E., Kuchinskiy, N. A., Labe, K. R., LaBounty, J., Lancaster, M., Lee, M. J., Lee, S., Li, B., Li, D., Li, L., Logashenko, I., Campos, A. Lorente, Lucà, A., Lukicov, G., Lusiani, A., Lyon, A. L., MacCoy, B., Madrak, R., Makino, K., Marignetti, F., Mastroianni, S., Miller, J. P., Miozzi, S., Morse, W. M., Mott, J., Nath, A., Newton, D., Nguyen, H., Osofsky, R., Park, S., Pauletta, G., Piacentino, G. M., Pilato, R. N., Pitts, K. T., Plaster, B., Počanić, D., Pohlman, N., Polly, C. C., Price, J., Quinn, B., Raha, N., Ramachandran, S., Ramberg, E., Ritchie, J. L., Roberts, B. L., Rubin, D. L., Santi, L., Sathyan, D., Schlesier, C., Schreckenberger, A., Semertzidis, Y. K., Smith, M. W., Sorbara, M., Stöckinger, D., Stapleton, J., Stoughton, C., Stratakis, D., Stuttard, T., Swanson, H. E., Sweetmore, G., Sweigart, D. A., Syphers, M. J., Tarazona, D. A., Teubner, T., Tewsley-Booth, A. E., Thomson, K., Tishchenko, V., Tran, N. H., Turner, W., Valetov, E., Vasilkova, D., Venanzoni, G., Walton, T., Weisskopf, A., Welty-Rieger, L., Winter, P., Wolski, A., and Wu, W.

Subjects
Physics - Accelerator Physics, High Energy Physics - Experiment
Abstract

This paper presents the beam dynamics systematic corrections and their uncertainties for the Run-1 data set of the Fermilab Muon g-2 Experiment. Two corrections to the measured muon precession frequency $\omega_a^m$ are associated with well-known effects owing to the use of electrostatic quadrupole (ESQ) vertical focusing in the storage ring. An average vertically oriented motional magnetic field is felt by relativistic muons passing transversely through the radial electric field components created by the ESQ system. The correction depends on the stored momentum distribution and the tunes of the ring, which has relatively weak vertical focusing. Vertical betatron motions imply that the muons do not orbit the ring in a plane exactly orthogonal to the vertical magnetic field direction. A correction is necessary to account for an average pitch angle associated with their trajectories. A third small correction is necessary because muons that escape the ring during the storage time are slightly biased in initial spin phase compared to the parent distribution. Finally, because two high-voltage resistors in the ESQ network had longer than designed RC time constants, the vertical and horizontal centroids and envelopes of the stored muon beam drifted slightly, but coherently, during each storage ring fill. This led to the discovery of an important phase-acceptance relationship that requires a correction. The sum of the corrections to $\omega_a^m$ is 0.50 $\pm$ 0.09 ppm; the uncertainty is small compared to the 0.43 ppm statistical precision of $\omega_a^m$., Comment: 35 pages, 29 figures. Accepted by Phys. Rev. Accel. Beams

Published
2021
Full Text
View/download PDF

13. First Precision Measurement of the Parity Violating Asymmetry in Cold Neutron Capture on $^3$He

Author

n3He Collaboration, Gericke, M. T., Baeßler, S., Barrón-Palos, L., Birge, N., Bowman, J. D., Britton Jr., C., Calarco, J., Cianciolo, V., Coppola, C. E., Crawford, C. B., Ezell, D., Fomin, N., Garishvili, I., Greene, G. L., Hale, G. M., Hamblen, J., Hayes, C., Iverson, E., Kabir, M. L., McCrea, M., Mueller, P. E., Novikov, I., Penttila, S., Plemons, E., Ramírez-Morales, A., Scott, E. M., Watts, J., and Wickersham, C.

Subjects
Nuclear Experiment
Abstract

We report the first precision measurement of the parity-violating asymmetry in the direction of proton emission with respect to the neutron spin, in the reaction $^{3}\mathrm{He}(\mathrm{n},\mathrm{p})^{3}\mathrm{H}$, using the capture of polarized cold neutrons in an unpolarized active $^3\rm{He}$ target. The asymmetry is a result of the weak interaction between nucleons, which remains one of the most poorly understood aspects of electro-weak theory. The measurement provides an important benchmark for modern effective field theory (EFT) calculations. Measurements like this are necessary to determine the spin-isospin structure of the hadronic weak interaction. Our asymmetry result is $A_{PV} = \left( 1.58 \pm 0.97 ~\mathrm{(stat)} \pm 0.24~\mathrm{(sys)}\right)\times10^{-8}$, which has the smallest uncertainty of any parity-violating asymmetry measurement so far.

Published
2020
Full Text
View/download PDF

14. The n$^3$He Experiment: Parity Violation in Polarized Neutron Capture on $^{3}$He

Author

n3He Collaboration, McCrea, M., Kabir, M. L., Birge, N., Coppola, C. E., Hayes, C., Plemons, E., Ramírez-Morales, A., Scott, E. M., Watts, J., Baessler, S., Barrón-Palos, L., Bowman, J. D., Britton Jr., C., Calarco, J., Cianciolo, V., Crawford, C. B., Ezell, D., Fomin, N., Garishvili, I., Gericke, M. T., Greene, G. L., Hale, G. M., Hamblen, J., Iverson, E., Mueller, P. E., Novikov, I., Penttila, S., and Wickersham, C.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

Significant progress has been made to experimentally determine a complete set of the parity-violating (PV) weak-interaction amplitudes between nucleons. In this paper we describe the design, construction and operation of the n$^3$He experiment that was used to measure the PV asymmetry $A_{\mathrm{PV}}$ in the direction of proton emission in the reaction $\vec{\mathrm{n}} + {^3}\mathrm{He} \rightarrow {^3}\mathrm{H} + \mathrm{p}$, using the capture of polarized cold neutrons in an unpolarized gaseous $^3\mathrm{He}$ target. This asymmetry has was recently calculated \cite{Viviani,Viviani2}, both in the traditional style meson exchange picture, and in effective field theory (EFT), including two-pion exchange. The high precision result (published separately) obtained with the experiment described herein forms an important benchmark for hadronic PV (HPV) theory in few-body systems, where precise calculations are possible. To this day, HPV is still one of the most poorly understood aspects of the electro-weak theory. The calculations estimate the size of the asymmetry to be in the range of $(-9.4 \rightarrow 3.5)\times 10^{-8}$, depending on the framework or model. The small size of the asymmetry and the small overall goal uncertainty of the experiment of $\delta A_{\mathrm{PV}} \simeq 1\times10^{-8}$ places strict requirements on the experiment, especially on the design of the target-detector chamber. In this paper we describe the experimental setup and the measurement methodology as well as the detailed design of the chamber, including results of Garfield++ and Geant4 simulations that form the basis of the chamber design and analysis. We also show data from commissioning and production and define the systematic errors that the chamber contributes to the measured $A_{\mathrm{PV}}$. We give the final uncertainty on the measurement.

Published
2020

15. A New Cryogenic Apparatus to Search for the Neutron Electric Dipole Moment

Author

Ahmed, M. W., Alarcon, R., Aleksandrova, A., Baessler, S., Barron-Palos, L., Bartoszek, L. M., Beck, D. H., Behzadipour, M., Berkutov, I., Bessuille, J., Blatnik, M., Broering, M., Broussard, L. J., Busch, M., Carr, R., Cianciolo, V., Clayton, S. M., Cooper, M. D., Crawford, C., Currie, S. A., Daurer, C., Dipert, R., Dow, K., Dutta, D., Efremenko, Y., Erickson, C. B., Filippone, B. W., Fomin, N., Gao, H., Golub, R., Gould, C. R., Greene, G., Haase, D. G., Hasell, D., Hawari, A. I., Hayden, M. E., Holley, A., Holt, R. J., Huffman, P. R., Ihloff, E., Imam, S. K., Ito, T. M., Karcz, M., Kelsey, J., Kendellen, D. P., Kim, Y. J., Korobkina, E., Korsch, W., Lamoreaux, S. K., Leggett, J., Leung, K. K. H., Lipman, A., Liu, C. Y., Long, J., MacDonald, S. W. T., Makela, M., Matlashov, A., Maxwell, J. D., Mendenhall, M., Meyer, H. O., Milner, R. G., Mueller, P. E., Nouri, N., O'Shaughnessy, C. M., Osthelder, C., Peng, J. C., Penttila, S. I., Phan, N. S., Plaster, B., Ramsey, J. C., Rao, T. M., Redwine, R. P., Reid, A., Saftah, A., Seidel, G. M., Silvera, I., Slutsky, S., Smith, E., Snow, W. M., Sondheim, W., Sosothikul, S., Stanislaus, T. D. S., Sun, X., Swank, C. M., Tang, Z., Dinani, R. Tavakoli, Tsentalovich, E., Vidal, C., Wei, W., White, C. R., Williamson, S. E., Yang, L., Yao, W., and Young, A. R.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). It uses superfluid $^4$He to produce a high density of Ultra-Cold Neutrons (UCN) which are contained in a suitably coated pair of measurement cells. The experiment, to be operated at the Spallation Neutron Source at Oak Ridge National Laboratory, uses polarized $^3$He from an Atomic Beam Source injected into the superfluid $^4$He and transported to the measurement cells as a co-magnetometer. The superfluid $^4$He is also used as an insulating medium allowing significantly higher electric fields, compared to previous experiments, to be maintained across the measurement cells. These features provide an ultimate statistical uncertainty for the EDM of $2-3\times 10^{-28}$ e-cm, with anticipated systematic uncertainties below this level.

Published
2019
Full Text
View/download PDF

16. Improved determination of the $\beta$-$\overline{\nu}_e$ angular correlation coefficient $a$ in free neutron decay with the $a$SPECT spectrometer

Author

Beck, M., Guardia, F. Ayala, Baeßler, S., Borg, M., Glück, F., Heil, W., Kahlenberg, J., Klopf, M., Konrad, G., Maisonobe, R., Horta, R. Muñoz, Schmidt, C., Schmidt, U., Simson, M., Soldner, T., Virot, R., Wunderle, A., and Zimmer, O.

Subjects
Nuclear Experiment
Abstract

We report on a precise measurement of the electron-antineutrino angular correlation ($a$ coefficient) in free neutron beta-decay from the $a$SPECT experiment. The $a$ coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4$\pi$ by the $a$SPECT spectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100 days run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain $a = -0.10430(84)$ which is the most precise measurement of the neutron $a$ coefficient to date. From this, the ratio of axial-vector to vector coupling constants is derived giving $|\lambda| = 1.2677(28)$.

Published
2019
Full Text
View/download PDF

17. The neutron electric dipole moment experiment at the Spallation Neutron Source

Author

Leung, K. K. H., Ahmed, M., Alarcon, R., Aleksandrova, A., Baeßler, S., Barrón-Palos, L., Bartoszek, L., Beck, D. H., Behzadipour, M., Bessuille, J., Blatnik, M. A., Broering, M., Broussard, L. J., Busch, M., Carr, R., Chu, P. -H., Cianciolo, V., Clayton, S. M., Cooper, M. D., Crawford, C., Currie, S. A., Daurer, C., Dipert, R., Dow, K., Dutta, D., Efremenko, Y., Erickson, C. B., Filippone, B. W., Fomin, N., Gao, H., Golub, R., Gould, C. R., Greene, G. L., Haase, D. G., Hasell, D., Hawari, A. I., Hayden, M. E., Holley, A. T., Holt, R. J., Huffman, P. R., Ihloff, E., Ito, T. M., Kelsey, J., Kim, Y. J., Koivuniemi, J., Korobkina, E., Korsch, W., Lamoreaux, S. K., Leggett, E., Lipman, A., Liu, C. -Y., Long, J., MacDonald, S. W. T., Makela, M., Matlashov, A., Maxwell, J., McCrea, M., Mendenhall, M., Meyer, H. O., Milner, R., Mueller, P., Nouri, N., O'Shaughnessy, C. M., Osthelder, C., Peng, J. -C., Penttila, S., Phan, N. S., Plaster, B., Ramsey, J., Rao, T., Redwine, R. P., Reid, A., Saftah, A., Seidel, G. M., Silvera, I. F., Slutsky, S., Smith, E., Snow, W. M., Sondheim, W., Sosothikul, S., Stanislaus, T. D. S., Sun, X., Swank, C. M., Tang, Z., Dinani, R. Tavakoli, Tsentalovich, E., Vidal, C., Wei, W., White, C. R., Williamson, S. E., Yang, L., Yao, W., and Young, A. R.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

Novel experimental techniques are required to make the next big leap in neutron electric dipole moment experimental sensitivity, both in terms of statistics and systematic error control. The nEDM experiment at the Spallation Neutron Source (nEDM@SNS) will implement the scheme of Golub & Lamoreaux [Phys. Rep., 237, 1 (1994)]. The unique properties of combining polarized ultracold neutrons, polarized $^3$He, and superfluid $^4$He will be exploited to provide a sensitivity to $\sim 10^{-28}\,e{\rm \,\cdot\, cm}$. Our cryogenic apparatus will deploy two small ($3\,{\rm L}$) measurement cells with a high density of ultracold neutrons produced and spin analyzed in situ. The electric field strength, precession time, magnetic shielding, and detected UCN number will all be enhanced compared to previous room temperature Ramsey measurements. Our $^3$He co-magnetometer offers unique control of systematic effects, in particular the Bloch-Siegert induced false EDM. Furthermore, there will be two distinct measurement modes: free precession and dressed spin. This will provide an important self-check of our results. Following five years of "critical component demonstration," our collaboration transitioned to a "large scale integration" phase in 2018. An overview of our measurement techniques, experimental design, and brief updates are described in these proceedings., Comment: Submitted to proceedings of PPNS 2018 - International Workshop on Particle physics at Neutron Sources (https://www.webofconferences.org/epj-web-of-conferences-forthcoming-conferences/1148-ppns-2018)

Published
2019
Full Text
View/download PDF

18. Particle physics at the European Spallation Source

Author

Abele, H., Alekou, A., Algora, A., Andersen, K., Baeßler, S., Barron-Pálos, L., Barrow, J., Baussan, E., Bentley, P., Berezhiani, Z., Beßler, Y., Bhattacharyya, A.K., Bianchi, A., Bijnens, J., Blanco, C., Kraljevic, N. Blaskovic, Blennow, M., Bodek, K., Bogomilov, M., Bohm, C., Bolling, B., Bouquerel, E., Brooijmans, G., Broussard, L.J., Buchan, O., Burgman, A., Calén, H., Carlile, C.J., Cederkall, J., Chanel, E., Christiansen, P., Cirigliano, V., Collar, J.I., Collins, M., Crawford, C.B., Morales, E. Cristaldo, Cupiał, P., D’Alessi, L., Damian, J.I. M., Danared, H., Dancila, D., de André, J.P.A.M., Delahaye, J.P., Degenkolb, S., Di Julio, D.D., Dracos, M., Dunne, K., Efthymiopoulos, I., Ekelöf, T., Eklund, L., Eshraqi, M., Esteban, I., Fanourakis, G., Farricker, A., Fernandez-Martinez, E., Ferreira, M.J., Fertl, M., Fierlinger, P., Folsom, B., Frank, A., Fratangelo, A., Friman-Gayer, U., Fukuda, T., Fynbo, H.O.U., Sosa, A. Garcia, Gazis, N., Gålnander, B., Geralis, Th., Ghosh, M., Gokbulut, G., Gomez-Cadenas, J.J., Gonzalez-Alonso, M., Gonzalez, F., Halić, L., Happe, C., Heil, P., Heinz, A., Herde, H., Holl, M., Jenke, T., Jenssen, M., Jericha, E., Johansson, H.T., Johansson, R., Johansson, T., Kamyshkov, Y., Topaksu, A. Kayis, Kildetoft, B., Kirch, K., Kliček, B., Klinkby, E., Kolevatov, R., Konrad, G., Kozioł, M., Krhač, K., Kupść, A., Łacny, Ł., Larizgoitia, L., Lewis, C.M., Lindroos, M., Lychagin, E., Lytken, E., Maiano, C., Marciniewski, P., Markaj, G., Märkisch, B., Marrelli, C., Martins, C., Meirose, B., Mezzetto, M., Milas, N., Milstead, D., Monrabal, F., Muhrer, G., Nepomuceno, A., Nesvizhevsky, V., Nilsson, T., Novella, P., Oglakci, M., Ohlsson, T., Olvegård, M., Oskarsson, A., Ota, T., Park, J., Patrzalek, D., Perrey, H., Persoz, M., Petkov, G., Piegsa, F.M., Pistillo, C., Poussot, P., Privitera, P., Rataj, B., Ries, D., Rizzi, N., Rosauro-Alcaraz, S., Rozpedzik, D., Saiang, D., Santoro, V., Schmidt, U., Schober, H., Schulthess, I., Silverstein, S., Simón, A., Sina, H., Snamina, J., Snow, W.M., Soldner, T., Stavropoulos, G., Stipčević, M., Szybiński, B., Takibayev, A., Tang, Z., Tarkeshian, R., Theroine, C., Thorne, J., Terranova, F., Thomas, J., Tolba, T., Torres-Sánchez, P., Trachanas, E., Tsenov, R., Uggerhøj, U.I., Vankova-Kirilova, G., Vassilopoulos, N., Wagner, R., Wang, X., Wildner, E., Wolke, M., Wurtz, J., Yiu, S.C., Yoon, S.G., Young, A.R., Zanini, L., Zejma, J., Zerzion, D., Zimmer, O., Zormpa, O., and Zou, Y.

Published
2023
Full Text
View/download PDF

19. Using Nab to determine correlations in unpolarized neutron decay

Author

Broussard, L. J., Baeßler, S., Bailey, T. L., Birge, N., Bowman, J. D., Crawford, C. B., Cude-Woods, C., Fellers, D. E., Fomin, N., Frlež, E., Gericke, M. T. W., Hayen, L., Jezghani, A. P., Li, H., Macsai, N., Makela, M. F., Mammei, R. R., Mathews, D., McGaughey, P. L., Mueller, P. E., Počanić, D., Royse, C. A., Salas-Bacci, A., Sjue, S. K. L., Ramsey, J. C., Severijns, N., Smith, E. C., Wexler, J., Whitehead, R. A., Young, A. R., and Zeck, B. A.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The Nab experiment will measure the ratio of the weak axial-vector and vector coupling constants $\lambda=g_A/g_V$ with precision $\delta\lambda/\lambda\sim3\times10^{-4}$ and search for a Fierz term $b_F$ at a level $\Delta b_F<10^{-3}$. The Nab detection system uses thick, large area, segmented silicon detectors to very precisely determine the decay proton's time of flight and the decay electron's energy in coincidence and reconstruct the correlation between the antineutrino and electron momenta. Excellent understanding of systematic effects affecting timing and energy reconstruction using this detection system are required. To explore these effects, a series of ex situ studies have been undertaken, including a search for a Fierz term at a less sensitive level of $\Delta b_F<10^{-2}$ in the beta decay of $^{45}$Ca using the UCNA spectrometer., Comment: Proceedings of the 7th International Syposium on Symmetries in Subatomic Physics SSP2018, Aachen (Germany), 10 - 15 Jun 2018. This is a pre-print of an article published in Hyperfine Interactions. The final authenticated version is available online at: https://doi.org/10.1007/s10751-018-1538-7

Published
2018
Full Text
View/download PDF

20. The Nab Experiment: A Precision Measurement of Unpolarized Neutron Beta Decay

Author

Fry, J., Alarcon, R., Baessler, S., Balascuta, S., Barron-Palos, L., Bailey, T., Bass, K., Birge, N., Blose, A., Borissenko, D., Bowman, J. D., Broussard, L. J., Bryant, A. T., Byrne, J., Calarco, J. R., Caylor, J., Chang, K., Chupp, T., Cianciolo, T. V., Crawford, C., Ding, X., Doyle, M., Fan, W., Farrar, W., Fomin, N., Frlez, E., Gericke, M. T., Gervais, M., Gluck, F., Greene, G. L., Grzywacz, R. K., Gudkov, V., Hamblen, J., Hayes, C., Hendrus, C., Ito, T., Jezghani, A., Li, H., Makela, M., Macsai, N., Mammei, J., Mammei, R., Martinez, M., Mathews, D. G., McCrea, M., McGaughey, P., McLaughlin, C. D., Mueller, P., van Petten, D., Penttila, S. I., Perryman, D. E., Picker, R., Pierce, J., Pocanic, D., Qian, Y., Ramsey, J., Randall, G., Riley, G., Rykaczewski, K. P., Salas-Bacci, A., Samiei, S., Scott, E. M., Shelton, T., Sjue, S. K., Smith, A., Smith, E., Stevens, E., Wexler, J., Whitehead, R., Wilburn, W. S., Young, A., and Zeck, B.

Subjects
Nuclear Experiment
Abstract

Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover the details of the weak interaction. Neutron beta decay can evaluate the ratio of axial-vector to vector coupling constants in the standard model, $\lambda = g_A / g_V$, through multiple decay correlations. The Nab experiment will carry out measurements of the electron-neutrino correlation parameter $a$ with a precision of $\delta a / a = 10^{-3}$ and the Fierz interference term $b$ to $\delta b = 3\times10^{-3}$ in unpolarized free neutron beta decay. These results, along with a more precise measurement of the neutron lifetime, aim to deliver an independent determination of the ratio $\lambda$ with a precision of $\delta \lambda / \lambda = 0.03\%$ that will allow an evaluation of $V_{ud}$ and sensitively test CKM unitarity, independent of nuclear models. Nab utilizes a novel, long asymmetric spectrometer that guides the decay electron and proton to two large area silicon detectors in order to precisely determine the electron energy and an estimation of the proton momentum from the proton time of flight. The Nab spectrometer is being commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source at Oak Ridge National Lab. We present an overview of the Nab experiment and recent updates on the spectrometer, analysis, and systematic effects., Comment: Presented at PPNS2018

Published
2018
Full Text
View/download PDF

21. First Observation of $P$-odd $\gamma$ Asymmetry in Polarized Neutron Capture on Hydrogen

Author

Blyth, D., Fry, J., Fomin, N., Alarcon, R., Alonzi, L., Askanazi, E., Baeßler, S., Balascuta, S., Barrón-Palos, L., Barzilov, A., Bowman, J. D., Birge, N., Calarco, J. R., Chupp, T. E., Cianciolo, V., Coppola, C. E., Crawford, C. B., Craycraft, K., Evans, D., Fieseler, C., Frlež, E., Garishvili, I., Gericke, M. T. W., Gillis, R. C., Grammer, K. B., Greene, G. L., Hall, J., Hamblen, J., Hayes, C., Iverson, E. B., Kabir, M. L., Kucuker, S., Lauss, B., Mahurin, R., McCrea, M., Maldonado-Velázquez, M., Masuda, Y., Mei, J., Milburn, R., Mueller, P. E., Musgrave, M., Nann, H., Novikov, I., Parsons, D., Penttilä, S. I., Počanić, D., Ramirez-Morales, A., Root, M., Salas-Bacci, A., Santra, S., Schröder, S., Scott, E., Seo, P. -N., Sharapov, E. I., Simmons, F., Snow, W. M., Sprow, A., Stewart, J., Tang, E., Tang, Z., Tong, X., Turkoglu, D. J., Whitehead, R., and Wilburn, W. S.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

We report the first observation of the parity-violating 2.2 MeV gamma-ray asymmetry $A^{np}_\gamma$ in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. $A^{np}_\gamma$ isolates the $\Delta I=1$, \mbox{$^{3}S_{1}\rightarrow {^{3}P_{1}}$} component of the weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to a single coupling constant in either the DDH meson exchange model or pionless EFT. We measured $A^{np}_\gamma = [-3.0 \pm 1.4 (stat) \pm 0.2 (sys)]\times 10^{-8}$, which implies a DDH weak $\pi NN$ coupling of $h_{\pi}^{1} = [2.6 \pm 1.2(stat) \pm 0.2(sys)] \times 10^{-7}$ and a pionless EFT constant of $C^{^{3}S_{1}\rightarrow ^{3}P_{1}}/C_{0}=[-7.4 \pm 3.5 (stat) \pm 0.5 (sys)] \times 10^{-11}$ MeV$^{-1}$. We describe the experiment, data analysis, systematic uncertainties, and the implications of the result., Comment: 6 pages, 5 figures

Published
2018
Full Text
View/download PDF

22. Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized $^{3}$He neutron spin-filter

Author

Musgrave, M. M., Baessler, S., Balascuta, S., Barron-Palos, L., Blyth, D., Bowman, J. D., Chupp, T. E., Cianciolo, V., Crawford, C., Craycraft, K., Fomin, N., Fry, J., Gericke, M., Gillis, R. C., Grammer, K., Greene, G. L., Hamblen, J., Hayes, C., Huffman, P., Jiang, C., Kucuker, S., McCrea, M., Mueller, P. E., Penttila, S. I., Snow, W. M., Tang, E., Tang, Z., Tong, X., and Wilburn, W. S.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Accurately measuring the neutron beam polarization of a high flux, large area neutron beam is necessary for many neutron physics experiments. The Fundamental Neutron Physics Beamline (FnPB) at the Spallation Neutron Source (SNS) is a pulsed neutron beam that was polarized with a supermirror polarizer for the NPDGamma experiment. The polarized neutron beam had a flux of $\sim10^9$ neutrons per second per cm$^2$ and a cross sectional area of 10$\times$12~cm$^2$. The polarization of this neutron beam and the efficiency of a RF neutron spin rotator installed downstream on this beam were measured by neutron transmission through a polarized $^{3}$He neutron spin-filter. The pulsed nature of the SNS enabled us to employ an absolute measurement technique for both quantities which does not depend on accurate knowledge of the phase space of the neutron beam or the $^{3}$He polarization in the spin filter and is therefore of interest for any experiments on slow neutron beams from pulsed neutron sources which require knowledge of the absolute value of the neutron polarization. The polarization and spin-reversal efficiency measured in this work were done for the NPDGamma experiment, which measures the parity violating $\gamma$-ray angular distribution asymmetry with respect to the neutron spin direction in the capture of polarized neutrons on protons. The experimental technique, results, systematic effects, and applications to neutron capture targets are discussed., Comment: 13 pages, 14 figures, 2 tables

Published
2018
Full Text
View/download PDF

23. Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan

Author

Acharya, B, primary, Adams, C, additional, Aleksandrova, A, additional, Alfonso, K, additional, An, P, additional, Baessler, S, additional, Balantekin, A, additional, Barbeau, P, additional, Bellini, F, additional, Bellini, V, additional, Beminiwatha, R, additional, Bernauer, J, additional, Bhattacharya, T, additional, Bishof, M, additional, Bolotnikov, A, additional, Breur, P, additional, Brodeur, M, additional, Brodsky, J, additional, Broussard, L, additional, Brunner, T, additional, Burdette, D, additional, Caylor, J, additional, Chiu, M, additional, Cirigliano, V, additional, Clark, J, additional, Clayton, S, additional, Daniels, T, additional, Darroch, L, additional, Davoudi, Z, additional, de Gouvea, A, additional, Dekens, W, additional, Demarteau, M, additional, DeMille, D, additional, Deshpande, A, additional, Detwiler, J, additional, Dodson, G, additional, Kolinski, M, additional, Elliott, S, additional, Engel, J, additional, Erler, J, additional, Filippone, B, additional, Fomin, N, additional, Formaggio, J, additional, Fry, J, additional, Fujikawa, B, additional, Fuller, G, additional, Fuyuto, K, additional, Gallant, A, additional, Gallina, G, additional, Garcia Ruiz, A, additional, Garcia Ruiz, R, additional, Gardner, S, additional, Gonzalez, F, additional, Gratta, G, additional, Gruszko, J, additional, Gudkov, V, additional, Giuseppe, V, additional, Gutierrez, T, additional, Hansen, E, additional, Hardy, C, additional, Haxton, W, additional, Hayer, L, additional, Hedges, S, additional, Heeger, K, additional, Heffner, M, additional, Heise, J, additional, Henning, R, additional, Hergert, H, additional, Hertzog, D, additional, Hervas Aguilar, D, additional, Holt, J, additional, Hoogerheide, S, additional, Hoppe, E, additional, Horoi, M, additional, Howell, C, additional, Huang, M, additional, Hutzler, N, additional, Imam, K, additional, Ito, T, additional, Jamil, A, additional, Janssens, R, additional, Jayich, A, additional, Kammel, P, additional, Liu, K, additional, Khachatryan, V, additional, King, P, additional, Klein, J, additional, Kneller, J, additional, Kolomensky, Y, additional, Korsch, W, additional, Krucken, R, additional, Kumar, K, additional, Launey, K, additional, Lawrence, D, additional, Leach, K, additional, Lehnert, B, additional, Lenardo, B, additional, Li, Z, additional, Lin, H, additional, Longfellow, B, additional, Lopez-Caceres, S, additional, Lunardini, C, additional, MacLellan, R, additional, Markoff, D, additional, Maruyama, R, additional, Mathews, D, additional, Melconian, D, additional, Mereghetti, E, additional, Mohanmurthy, P, additional, Moore, D, additional, Mueller, P, additional, Mumm, H, additional, Nazarewicz, W, additional, Newby, J, additional, Nicholson, A, additional, Novitski, E, additional, Nzobadila Ondze, J, additional, O'Donnell, T, additional, Orebi Gann, G, additional, Orrell, J, additional, Ouellet, J, additional, Parno, D, additional, Paschke, K, additional, Pastore, S, additional, Pattie Jr, R, additional, Petrov, A, additional, Pitt, M, additional, Plaster, B, additional, Pocanic, D, additional, Pocar, A, additional, Radford, D, additional, Rahangdale, H, additional, Rasco, B, additional, Rasiwala, H, additional, Redwine, R, additional, Ritz, A, additional, Rogers, L, additional, Ron, G, additional, Saldanha, R, additional, Sangiorgio, S, additional, Sargsyan, G, additional, Saunders, A, additional, Savard, G, additional, Schaper, D, additional, Scholberg, K, additional, Scielzo, N, additional, Seng, C, additional, Shindler, A, additional, Singh, J, additional, Singh, M, additional, Singh, V, additional, Snow, W, additional, Soma, A, additional, Souder, P, additional, Speller, D, additional, Stachurska, J, additional, Surukuchi, P, additional, Tapia Oregui, B, additional, Tomalak, O, additional, Torres, J, additional, Tyuka, O, additional, VanDevender, B, additional, Varriano, L, additional, Vogt, R, additional, Walker-Loud, A, additional, Wamba, K, additional, Watkins, S, additional, Wietfeldt, F, additional, Williams, W, additional, Wilson, J, additional, Winslow, L, additional, Yan, X, additional, Yang, L, additional, Young, A, additional, Zheng, X, additional, and Zhou, Y, additional

Published
2023
Full Text
View/download PDF

24. Detection System for Neutron $\beta$ Decay Correlations in the UCNB and Nab experiments

Author

Broussard, L. J., Zeck, B. A., Adamek, E. R., Baeßler, S., Birge, N., Blatnik, M., Bowman, J. D., Brandt, A. E., Brown, M., Burkhart, J., Callahan, N. B., Clayton, S. M., Crawford, C., Cude-Woods, C., Currie, S., Dees, E. B., Ding, X., Fomin, N., Frlez, E., Fry, J., Gray, F. E., Hasan, S., Hickerson, K. P., Hoagland, J., Holley, A. T., Ito, T. M., Klein, A., Li, H., Liu, C. -Y., Makela, M. F., McGaughey, P. L., Mirabal-Martinez, J., Morris, C. L., Ortiz, J. D., Pattie Jr., R. W., Penttilä, S. I., Plaster, B., Počanić, D., Ramsey, J. C., Salas-Bacci, A., Salvat, D. J., Saunders, A., Seestrom, S. J., Sjue, S. K. L., Sprow, A. P., Tang, Z., Vogelaar, R. B., Vorndick, B., Wang, Z., Wei, W., Wexler, J., Wilburn, W. S., Womack, T. L., and Young, A. R.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

We describe a detection system designed for precise measurements of angular correlations in neutron $\beta$ decay. The system is based on thick, large area, highly segmented silicon detectors developed in collaboration with Micron Semiconductor, Ltd. The prototype system meets specifications for $\beta$ electron detection with energy thresholds below 10 keV, energy resolution of $\sim$3 keV FWHM, and rise time of $\sim$50 ns with 19 of the 127 detector pixels instrumented. Using ultracold neutrons at the Los Alamos Neutron Science Center, we have demonstrated the coincident detection of $\beta$ particles and recoil protons from neutron $\beta$ decay. The fully instrumented detection system will be implemented in the UCNB and Nab experiments, to determine the neutron $\beta$ decay parameters $B$, $a$, and $b$., Comment: Copyright 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

Published
2016
Full Text
View/download PDF

25. A Storage Ring Experiment to Detect a Proton Electric Dipole Moment

Author

Anastassopoulos, V., Andrianov, S., Baartman, R., Bai, M., Baessler, S., Benante, J., Berz, M., Blaskiewicz, M., Bowcock, T., Brown, K., Casey, B., Conte, M., Crnkovic, J., Fanourakis, G., Fedotov, A., Fierlinger, P., Fischer, W., Gaisser, M. O., Giomataris, Y., Grosse-Perdekamp, M., Guidoboni, G., Haciomeroglu, S., Hoffstaetter, G., Huang, H., Incagli, M., Ivanov, A., Kawall, D., Khazin, B., Kim, Y. I., King, B., Koop, I. A., Larsen, R., Lazarus, D. M., Lebedev, V., Lee, M. J., Lee, S., Lee, Y. H., Lehrach, A., Lenisa, P., Sandri, P. Levi, Luccio, A. U., Lyapin, A., MacKay, W., Maier, R., Makino, K., Malitsky, N., Marciano, W. J., Meng, W., Meot, F., Metodiev, E. M., Miceli, L., Moricciani, D., Morse, W. M., Nagaitsev, S., Nayak, S. K., Orlov, Y. F., Ozben, C. S., Park, S. T., Pesce, A., Pile, P., Polychronakos, V., Podobedov, B., Pretz, J., Ptitsyn, V., Ramberg, E., Raparia, D., Rathmann, F., Rescia, S., Roser, T., Sayed, H. Kamal, Semertzidis, Y. K., Senichev, Y., Sidorin, A., Silenko, A., Simos, N., Stahl, A., Stephenson, E. J., Stroeher, H., Syphers, M. J., Talman, J., Talman, R. M., Tishchenko, V., Touramanis, C., Tsoupas, N., Venanzoni, G., Vetter, K., Vlassis, S., Won, E., Zavattini, G., Zelenski, A., and Zioutas, K.

Subjects
Physics - Accelerator Physics, High Energy Physics - Experiment
Abstract

A new experiment is described to detect a permanent electric dipole moment of the proton with a sensitivity of $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant to the experiment are discussed and techniques to address them are presented. The measurement is sensitive to new physics beyond the Standard Model at the scale of 3000~TeV., Comment: 8 pages, 3 figures

Published
2015
Full Text
View/download PDF

26. Muon (g-2) Technical Design Report

Author

Grange, J., Guarino, V., Winter, P., Wood, K., Zhao, H., Carey, R. M., Gastler, D., Hazen, E., Kinnaird, N., Miller, J. P., Mott, J., Roberts, B. L., Benante, J., Crnkovic, J., Morse, W. M., Sayed, H., Tishchenko, V., Druzhinin, V. P., Khazin, B. I., Koop, I. A., Logashenko, I., Shatunov, Y. M., Solodov, E., Korostelev, M., Newton, D., Wolski, A., Chapelain, A., Bjorkquist, R., Eggert, N., Frankenthal, A., Gibbons, L., Kim, S., Mikhailichenko, A., Orlov, Y., Rubin, D., Sweigart, D., Allspach, D., Annala, G., Barzi, E., Bourland, K., Brown, G., Casey, B. C. K., Chappa, S., Convery, M. E., Drendel, B., Friedsam, H., Gadfort, T., Hardin, K., Hawke, S., Hayes, S., Jaskierny, W., Johnstone, C., Johnstone, J., Kashikhin, V., Kendziora, C., Kiburg, B., Klebaner, A., Kourbanis, I., Kyle, J., Larson, N., Leveling, A., Lyon, A. L., Markley, D., McArthur, D., Merritt, K. W., Mokhov, N., Morgan, J. P., Nguyen, H., Ostiguy, J-F., Para, A., Popovic, C. C. Polly M., Ramberg, E., Rominsky, M., Schoo, D., Schultz, R., Still, D., Soha, A. K., Strigonov, S., Tassotto, G., Turrioni, D., Villegas, E., Voirin, E., Velev, G., Welty-Rieger, L., Wolff, D., Worel, C., Wu, J-Y., Zifko, R., Jungmann, K., Onderwater, C. J. G., Debevec, P. T., Ganguly, S., Kasten, M., Leo, S., Pitts, K., Schlesier, C., Gaisser, M., Haciomeroglu, S., Kim, Y-I., Lee, S., Lee, M-J, Semertzidis, Y. K., Giovanetti, K., Baranov, V. A., Duginov, V. N., Khomutov, N. V., Krylov, V. A., Kuchinskiy, N. A., Volnykh, V. P., Crawford, C., Fatemi, R., Gohn, W. P., Gorringe, T. P., Korsch, W., Plaster, B., Anastasi, A., Babusci, D., Dabagov, S., Ferrari, C., Fioretti, A., Gabbanini, C., Hampai, D., Palladino, A., Venanzoni, G., Bowcock, T., Carroll, J., King, B., Maxfield, S., McCormick, K., Price, J., Sim, D., Smith, A., Teubner, T., Turner, W., Whitley, M., Wormald, M., Chislett, R., Kilani, S., Lancaster, M., Motuk, E., Stuttard, T., Warren, M., Flay, D., Kawall, D., Meadows, Z., Chupp, T., Raymond, R., Tewlsey-Booth, A., Syphers, M. J., Tarazona, D., Catalonotti, S., Di Stefano, R., Iacovacci, M., Mastroianni, S., Chattopadhyay, S., Eads, M., Fortner, M., Hedin, D., Pohlman, N., de Gouvea, A., Schellman, H., Azfar, F., Henry, S., Alkhazov, G. D., Golovtsov, V. L., Neustroev, P. V., Uvarov, L. N., Vasilyev, A. A., Vorobyov, A. A., Zhalov, M. B., Cerrito, L., Gray, F., Di Sciascio, G., Moricciani, D., Fu, C., Ji, X., Li, L., Yang, H., Stöckinger, D., Cantatore, G., Cauz, D., Karuza, M., Pauletta, G., Santi, L., Baeßler, S., Bychkov, M., Frlez, E., Pocanic, D., Alonzi, L. P., Fertl, M., Fienberg, A., Froemming, N., Garcia, A., Kaspar, D. W. Hertzog J., Kammel, P., Osofsky, R., Smith, M., Swanson, E., van Wechel, T., and Lynch, K.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

The Muon (g-2) Experiment, E989 at Fermilab, will measure the muon anomalous magnetic moment a factor-of-four more precisely than was done in E821 at the Brookhaven National Laboratory AGS. The E821 result appears to be greater than the Standard-Model prediction by more than three standard deviations. When combined with expected improvement in the Standard-Model hadronic contributions, E989 should be able to determine definitively whether or not the E821 result is evidence for physics beyond the Standard Model. After a review of the physics motivation and the basic technique, which will use the muon storage ring built at BNL and now relocated to Fermilab, the design of the new experiment is presented. This document was created in partial fulfillment of the requirements necessary to obtain DOE CD-2/3 approval., Comment: 666 pages

Published
2015

27. Frequency shifts in gravitational resonance spectroscopy

Author

Baeßler, S., Nesvizhevsky, V. V., Pignol, G., Protasov, K. V., Rebreyend, D., Kupriyanova, E. A., and Voronin, A. Yu.

Subjects
Nuclear Experiment, Quantum Physics
Abstract

Quantum states of ultracold neutrons in the gravitational field are to be characterized through gravitational resonance spectroscopy. This paper discusses systematic effects that appear in the spectroscopic measurements. The discussed frequency shifts, which we call Stern-Gerlach shift, interference shift, and spectator state shift, appear in conceivable measurement schemes and have general importance. These shifts have to be taken into account in precision experiments.

Published
2015
Full Text
View/download PDF

28. New precision measurements of free neutron beta decay with cold neutrons

Author

Baeßler, S., Bowman, J. D., Penttilä, S., and Počanić, D.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

Precision measurements in free neutron beta decay serve to determine the coupling constants of beta decay, and offer several stringent tests of the Standard Model. This paper describes the free neutron beta decay program planned for the Fundamental Physics Beamline at the Spallation Neutron Source at Oak Ridge National Laboratory, and puts it into the context of other recent and planned measurements of neutron beta decay observables.

Published
2014
Full Text
View/download PDF

29. Gravitational resonance spectroscopy with an oscillating magnetic field gradient in the GRANIT flow through arrangement

Author

Pignol, G., Baessler, S., Nesvizhevsky, V. V., Protasov, K., Rebreyend, D., and Voronin, A. Yu.

Subjects
Quantum Physics
Abstract

Gravitational resonance spectroscopy consists in measuring the energy spectrum of bouncing ultracold neutrons above a mirror by inducing resonant transitions between different discrete quantum levels. We discuss how to induce the resonances with a flow through arrangement in the GRANIT spectrometer, excited by an oscillating magnetic field gradient. The spectroscopy could be realized in two distinct modes (so called DC and AC) using the same device to produce the magnetic excitation. We present calculations demonstrating the feasibility of the newly proposed AC mode.

Published
2014
Full Text
View/download PDF

30. Neutron Beta Decay Studies with Nab

Author

Baeßler, S., Alarcon, R., Alonzi, L. P., Balascuta, S., Barrón-Palos, L., Bowman, J. D., Bychkov, M. A., Byrne, J., Calarco, J. R., Chupp, T., Vianciolo, T. V., Crawford, C., Frlež, E., Gericke, M. T., Glück, F., Greene, G. L., Grzywacz, R. K., Gudkov, V., Harrison, D., Hersman, F. W., Ito, T., Makela, M., Martin, J., McGaughey, P. L., McGovern, S., Page, S., Penttilä, S. I., Počanić, D., Rykaczewski, K. P., Salas-Bacci, A., Tompkins, Z., Wagner, D., Wilburn, W. S., and Young, A. R.

Subjects
Nuclear Experiment
Abstract

Precision measurements in neutron beta decay serve to determine the coupling constants of beta decay and allow for several stringent tests of the standard model. This paper discusses the design and the expected performance of the Nab spectrometer., Comment: Submitted to Proceedings of the Conference CIPANP12, St.Petersburg, Florida, May 2012

Published
2012
Full Text
View/download PDF

31. Impact of Neutron Decay Experiments on non-Standard Model Physics

Author

Konrad, G., Heil, W., Baeßler, S., Počanić, D., and Glück, F.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

This paper gives a brief overview of the present and expected future limits on physics beyond the Standard Model (SM) from neutron beta decay, which is described by two parameters only within the SM. Since more than two observables are accessible, the problem is over-determined. Thus, precise measurements of correlations in neutron decay can be used to study the SM as well to search for evidence of possible extensions to it. Of particular interest in this context are the search for right-handed currents or for scalar and tensor interactions. Precision measurements of neutron decay observables address important open questions of particle physics and cosmology, and are generally complementary to direct searches for new physics beyond the SM in high-energy physics. Free neutron decay is therefore a very active field, with a number of new measurements underway worldwide. We present the impact of recent developments., Comment: 13 pages, 6 figures; Proceedings of the 5th International BEYOND 2010 Conference, Cape Town, South Africa (2010), World Scientific, accepted for publication; Corrected typos

Published
2010
Full Text
View/download PDF

32. Constraints on spin-dependent short-range interactions using gravitational quantum levels of ultracold neutrons

Author

Baeßler, S., Nesvizhevsky, V. V., Pignol, G., Protasov, K. V., and Voronin, A. Yu.

Subjects
Nuclear Experiment
Abstract

In this paper, we discuss a possibility to improve constraints on spin-dependent short-range interactions in the range of 1 - 200 micrometer significantly. For such interactions, our constraints are without competition at the moment. They were obtained through the observation of gravitationally bound states of ultracold neutrons. We are going to improve these constraints by about three orders of magnitude in a dedicated experiment with polarized neutrons using the next-generation spectrometer GRANIT., Comment: 5 pages, 4 figures, accepted for publication in the Proceedings of the International Workshop on Particle Physics with Cold Neutrons, Grenoble, May 2008, to be published in Nucl. Instr. and Meth. A

Published
2009
Full Text
View/download PDF

33. A method to measure the resonance transitions between the gravitationally bound quantum states of neutrons in the GRANIT spectrometer

Author

Kreuz, M., Nesvizhevsky, V. V., Schmidt-Wellenburg, P., Soldner, T., Thomas, M., Boerner, H. G., Naraghi, F., Pignol, G., Protasov, K. V., Rebreyend, D., Vezzu, F., Flaminio, R., Michel, C., Pinard, L., Remillieux, A., Baessler, S., Gagarski, A. M., Grigorieva, L. A., Kuzmina, T. M., Meyerovich, A. E., Mezhov-Deglin, L. P., Petrov, G. A., Strelkov, A. V., and Voronin, A. Yu.

Subjects
Physics - Instrumentation and Detectors
Abstract

We present a method to measure the resonance transitions between the gravitationally bound quantum states of neutrons in the GRANIT spectrometer. The purpose of GRANIT is to improve the accuracy of measurement of the quantum states parameters by several orders of magnitude, taking advantage of long storage of Ultracold neutrons at specula trajectories. The transitions could be excited using a periodic spatial variation of a magnetic field gradient. If the frequency of such a perturbation (in the frame of a moving neutron) coincides with a resonance frequency defined by the energy difference of two quantum states, the transition probability will sharply increase. The GRANIT experiment is motivated by searches for short-range interactions (in particular spin-dependent interactions), by studying the interaction of a quantum system with a gravitational field, by searches for extensions of the Standard model, by the unique possibility to check the equivalence principle for an object in a quantum state and by studying various quantum optics phenomena.

Published
2009
Full Text
View/download PDF

34. Measuring the proton spectrum in neutron decay - latest results with aSPECT

Author

Simson, M., Guardia, F. Ayala, Baeßler, S., Borg, M., Glück, F., Heil, W., Konorov, I., Konrad, G., Horta, R. Muñoz, Leung, K. K. H., Sobolev, Yu., Soldner, T., Wirth, H. -F., and Zimmer, O.

Subjects
Nuclear Experiment
Abstract

The retardation spectrometer aSPECT was built to measure the shape of the proton spectrum in free neutron decay with high precision. This allows us to determine the antineutrino electron angular correlation coefficient a. We aim for a precision more than one order of magnitude better than the present best value, which is Delta_a /a = 5%. In a recent beam time performed at the Institut Laue-Langevin during April / May 2008 we reached a statistical accuracy of about 2% per 24 hours measurement time. Several systematic effects were investigated experimentally. We expect the total relative uncertainty to be well below 5%., Comment: Accepted for publication in the Conference Proceedings of the International Workshop on Particle Physics with Slow Neutrons 2008 held at the ILL, France. To be published in Nuclear Instruments and Methods in Physics Research, Section A

Published
2008
Full Text
View/download PDF

35. Nab: Measurement Principles, Apparatus and Uncertainties

Author

Pocanic, D., Alarcon, R., Alonzi, L. P., Baessler, S., Balascuta, S., Bowman, J. D., Bychkov, M. A., Byrne, J., Calarco, J. R., Cianciolo, V., Crawford, C., Frlez, E., Gericke, M. T., Greene, G. L., Grzywacz, R. K., Gudkov, V., Hersman, F. W., Klein, A., Martin, J., Page, S. A., Palladino, A., Penttila, S. I., Rykaczewski, K. P., Wilburn, W. S., Young, A. R., and Young, G. R.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

The Nab collaboration will perform a precise measurement of 'a', the electron-neutrino correlation parameter, and 'b', the Fierz interference term in neutron beta decay, in the Fundamental Neutron Physics Beamline at the SNS, using a novel electric/magnetic field spectrometer and detector design. The experiment is aiming at the 10^{-3} accuracy level in (Delta a)/a, and will provide an independent measurement of lambda = G_A/G_V, the ratio of axial-vector to vector coupling constants of the nucleon. Nab also plans to perform the first ever measurement of 'b' in neutron decay, which will provide an independent limit on the tensor weak coupling., Comment: 12 pages, 6 figures, 1 table, talk presented at the International Workshop on Particle Physics with Slow Neutrons, Grenoble, 29-31 May 2008; to appear in Nucl. Instrum. Meth. in Physics Research A

Published
2008
Full Text
View/download PDF

36. A clean, bright, and versatile source of neutron decay products

Author

Dubbers, D., Abele, H., Baessler, S., Maerkisch, B., Schumann, M., Soldner, T., and Zimmer, O.

Subjects
Nuclear Experiment
Abstract

We present a case study on a new type of cold neutron beam station for the investigation of angular correlations in the beta-decay of free neutrons. With this beam station, called PERC, the 'active decay volume' lies inside the neutron guide, and the charged neutron decay products are magnetically guided towards the end of the neutron guide. Hence, the guide delivers at its exit a beam of decay electrons and protons, under well-defined and precisely variable conditions, which can be well separated from the cold neutron beam. In this way a general-purpose source of neutron decay products is obtained which can be used for various different experiments in neutron decay correlation spectroscopy. A gain in phase space density of several orders of magnitude can be achieved with PERC, as compared to existing neutron decay spectrometers. Neutron beam related background is separately measurable in PERC, and magnetic mirror effects on the charged neutron decay products and edge effects in the active neutron beam volume are both strongly suppressed. Therefore the spectra and angular distributions of the emerging decay particles will be distortion-free on the level of 10^-4, more than 10 times better than achieved today., Comment: 20 pages, 6 figures

Published
2007
Full Text
View/download PDF

37. GRANIT project: a trap for gravitational quantum states of UCN

Author

Pignol, G., Protasov, K. V., Rebreyend, D., Vezzu, F., Nesvizhevsky, V. V., Petukhov, A. K., Börner, H. G., Soldner, T., Schmidt-Wellenburg, P., Kreuz, M., Forest, D., Ganau, P., Mackowski, J. M., Michel, C., Montorio, J. L., Morgado, N., Pinard, L., Remillieux, A., Gagarski, A. M., Petrov, G. A., Kusmina, A. M., Strelkov, A. V., Abele, H., Baeßler, S., and Voronin, A. Yu.

Subjects
Quantum Physics
Abstract

Previous studies of gravitationally bound states of ultracold neutrons showed the quantization of energy levels, and confirmed quantum mechanical predictions for the average size of the two lowest energy states wave functions. Improvements in position-like measurements can increase the accuracy by an order of magnitude only. We therefore develop another approach, consisting in accurate measurements of the energy levels. The GRANIT experiment is devoted to the study of resonant transitions between quantum states induced by an oscillating perturbation. According to Heisenberg's uncertainty relations, the accuracy of measurement of the energy levels is limited by the time available to perform the transitions. Thus, trapping quantum states will be necessary, and each source of losses has to be controlled in order to maximize the lifetime of the states. We discuss the general principles of transitions between quantum states, and consider the main systematical losses of neutrons in a trap., Comment: presented in ISINN 15 seminar, Dubna

Published
2007

38. A New Constraint for the Coupling of Axion-like particles to Matter via Ultra-Cold Neutron Gravitational Experiments

Author

Baessler, S., Nesvizhevsky, V. V., Protasov, K. V., and Voronin, A. Yu.

Subjects
High Energy Physics - Phenomenology
Abstract

We present a new constraint for the axion monopole-dipole coupling in the range of 1 micrometer to a few millimeters, previously unavailable for experimental study. The constraint was obtained using our recent results on the observation of neutron quantum states in the Earth's gravitational field. We exploit the ultimate sensitivity of ultra-cold neutrons (UCN) in the lowest gravitational states above a material surface to any additional interaction between the UCN and the matter, if the characteristic interaction range is within the mentioned domain. In particular, we find that the upper limit for the axion monopole-dipole coupling constant is (g_p g_s)/(\hbar c)<2 x 10^{-15} for the axion mass in the ``promising'' axion mass region of ~1 meV., Comment: 5 pages 3 figures

Published
2006
Full Text
View/download PDF

39. A quantum mechanical description of the experiment on the observation of gravitationally bound states

Author

Westphal, Alexander, Abele, H., Baessler, S., Nesvizhevsky, V. V., Petukhov, A. K., Protasov, K. V., and Voronin, A. Yu.

Subjects
High Energy Physics - Phenomenology
Abstract

Quantum states in the Earth's gravitational field were observed, when ultra-cold neutrons fall under gravity. The experimental results can be described by the quantum mechanical scattering model as it is presented here. We also discuss other geometries of the experimental setup which correspond to the absence or the reversion of gravity. Since our quantum mechanical model describes, particularly, the experimentally realized situation of reversed gravity quantitatively, we can practically rule out alternative explanations of the quantum states in terms of pure confinement effects., Comment: LaTeX, 10 pages, 4 figures, v2: references added

Published
2006
Full Text
View/download PDF

40. Quantum motion of a neutron in a wave-guide in the gravitational field

Author

Voronin, A. Yu., Abele, H., Baessler, S., Nesvizhevsky, V. V., Petukhov, A. K., Protasov, K. V., and Westphal, A.

Subjects
Quantum Physics
Abstract

We study theoretically the quantum motion of a neutron in a horizontal wave-guide in the gravitational field of the Earth. The wave-guide in question is equipped with a mirror below and a rough absorber above. We show that such a system acts as a quantum filter, i.e. it effectively absorbs quantum states with sufficiently high transversal energy but transmits low-energy states. The states transmitted are mainly determined by the potential well formed by the gravitational field of the Earth and the mirror. The formalism developed for quantum motion in an absorbing wave-guide is applied to the description of the recent experiment on the observation of the quantum states of neutrons in the Earth's gravitational field.

Published
2005
Full Text
View/download PDF

41. Study of the neutron quantum states in the gravity field

Author

Nesvizhevsky, V. V., Petukhov, A. K., Boerner, H. G., Baranova, T. A., Gagarski, A. M., Petrov, G. A., Protasov, K. V., Voronin, A. Yu., Baessler, S., Abele, H., Westphal, A., and Lucovac, L.

Subjects
High Energy Physics - Phenomenology
Abstract

We have studied neutron quantum states in the potential well formed by the earth's gravitational field and a horizontal mirror. The estimated characteristic sizes of the neutron wave functions in the two lowest quantum states correspond to expectations with an experimental accuracy. A position-sensitive neutron detector with an extra-high spatial resolution of ~2 microns was developed and tested for this particular experiment, to be used to measure the spatial density distribution in a standing neutron wave above a mirror for a set of some of the lowest quantum states. The present experiment can be used to set an upper limit for an additional short-range fundamental force. We studied methodological uncertainties as well as the feasibility of improving further the accuracy of this experiment.

Published
2005
Full Text
View/download PDF

42. Measurement of quantum states of neutrons in the Earth's gravitational field

Author

Nesvizhevsky, V. V., Boerner, H. G., Gagarsky, A. M., Petoukhov, A. K., Petrov, G. A., Abele, H., Baessler, S., Divkovic, G., Ruess, F. J., Stoeferle, Th., Westphal, A., Strelkov, A. V., Protasov, K. V., and Voronin, A. Yu.

Subjects
High Energy Physics - Phenomenology
Abstract

The lowest stationary quantum state of neutrons in the Earth's gravitational field is identified in the measurement of neutron transmission between a horizontal mirror on the bottom and an absorber on top. Such an assembly is not transparent for neutrons if the absorber height is smaller than the "height" of the lowest quantum state.

Published
2003
Full Text
View/download PDF

43. Is the Unitarity of the quark-mixing-CKM-matrix violated in neutron $\beta$-decay?

Author

Abele, H., Hoffmann, M. Astruc, Baessler, S., Dubbers, D., Glück, F., Müller, U., Nesvizhevsky, V., Reich, J., and Zimmer, O.

Subjects
High Energy Physics - Experiment
Abstract

We report on a new measurement of neutron $\beta$-decay asymmetry. From the result \linebreak $A_0$ = -0.1189(7), we derive the ratio of the axial vector to the vector coupling constant $\lambda$ = ${\it g_A/g_V}$ = -1.2739(19). When included in the world average for the neutron lifetime $\tau$ = 885.7(7)s, this gives the first element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix $V_{ud} $. With this value and the Particle Data Group values for $V_{us}$ and $V_{ub}$, we find a deviation from the unitarity condition for the first row of the CKM matrix of $\Delta$ = 0.0083(28), which is 3.0 times the stated error.

Published
2002
Full Text
View/download PDF

44. Detection system for neutron β decay correlations in the UCNB and Nab experiments

Author

Broussard, L.J., Zeck, B.A., Adamek, E.R., Baeßler, S., Birge, N., Blatnik, M., Bowman, J.D., Brandt, A.E., Brown, M., Burkhart, J., Callahan, N.B., Clayton, S.M., Crawford, C., Cude-Woods, C., Currie, S., Dees, E.B., Ding, X., Fomin, N., Frlez, E., Fry, J., Gray, F.E., Hasan, S., Hickerson, K.P., Hoagland, J., Holley, A.T., Ito, T.M., Klein, A., Li, H., Liu, C.-Y., Makela, M.F., McGaughey, P.L., Mirabal-Martinez, J., Morris, C.L., Ortiz, J.D., Pattie, R.W., Jr., Penttilä, S.I., Plaster, B., Počanić, D., Ramsey, J.C., Salas-Bacci, A., Salvat, D.J., Saunders, A., Seestrom, S.J., Sjue, S.K.L., Sprow, A.P., Tang, Z., Vogelaar, R.B., Vorndick, B., Wang, Z., Wei, W., Wexler, J., Wilburn, W.S., Womack, T.L., and Young, A.R.

Published
2017
Full Text
View/download PDF

45. Status of the NPDGamma experiment

Author

Fry, J., Alarcon, R., Allen, R., Askanazi, E., Balascuta, S., Barron-Palos, L., Baeßler, S., Barzilov, A., Blessinger, C., Blyth, D., Bowman, J. D., Calarco, J. R., Chupp, T. E., Coppola, C. E., Crawford, C., Craycraft, K., Dabaghyan, M., Evans, D., Favela, J., Fieseler, C., Fomin, N., Fox, W., Freedman, S., Frlež, E., Fu, C., Garcia, C., Garishvili, I., Gericke, M. T., Gillis, R. C., Grammer, K., Greene, G. L., Hamblen, J., Hayes, C., Hersman, F. W., Ino, T., Iverson, E. B., Jones, G. L., Kabir, L., Kucucker, S., Lauss, B., Li, Y., Mahurin, R., Maldonado-Velazquez, M., McCrea, M., Masuda, Y., Mei, J., Milburn, R., Mitchell, G. S., Mueller, P., Muto, S., Musgrave, M., Nann, H., Novikov, I., Page, S., Parsons, D., Počanić, D., Penttilä, S. I., Ramsay, W. D., Salas-Bacci, A., Santra, S., Seo, P.-N., Sharapov, E., Sharma, M., Simmons, F., Smith, T., Snow, W. M., Stuart, J., Tang, E., Tang, Z., Thomison, J., Tong, T., Vanderwerp, J., Waldecker, S., Wilburn, W. S., Xu, W., Yuan, V., and Zhang, Y.

Published
2017
Full Text
View/download PDF

46. The Nab experiment: A precision measurement of unpolarized neutron beta decay

Author

Fry J., Alarcon R., Baeßler S., Balascuta S., Palos L. Barrón, Bailey T., Bass K., Birge N., Blose A., Borissenko D., Bowman J.D., Broussard L.J., Bryant A.T., Byrne J., Calarco J.R., Caylor J., Chang K., Chupp T., Cianciolo T.V., Crawford C., Ding X., Doyle M., Fan W., Farrar W., Fomin N., Frlež E., Gericke M.T., Gervais M., Glück F., Greene G.L., Grzywacz R.K., Gudkov V., Hamblen J., Hayes C., Hendrus C., Ito T., Jezghani A., Li H., Makela M., Macsai N., Mammei J., Mammei R., Martinez M., Matthews D.G., McCrea M., McGaughey P., McLaughlin C.D., Mueller P., Petten D. van, Penttilä S.I., Perryman D.E., Picker R., Pierce J., Počanić D., Qian Y., Ramsey J., Randall G., Riley G., Rykaczewski K.P., Salas-Bacci A., Samiei S., Scott E.M., Shelton T., Sjue S.K., Smith A., Smith E., Stevens E., Wexler J., Whitehead R., Wilburn W.S., Young A., and Zeck B.

Subjects
Physics, QC1-999
Abstract

Neutron beta decay is one of the most fundamental processes in nuclear physics and provides sensitive means to uncover the details of the weak interaction. Neutron beta decay can evaluate the ratio of axial-vector to vector coupling constants in the standard model, λ = gA/gV, through multiple decay correlations. The Nab experiment will carry out measurements of the electron-neutrino correlation parameter a with a precision of δa/a = 10−3 and the Fierz interference term b to δb = 3 × 10−3 in unpolarized free neutron beta decay. These results, along with a more precise measurement of the neutron lifetime, aim to deliver an independent determination of the ratio λ with a precision of δλ/λ = 0.03% that will allow an evaluation of Vud and sensitively test CKM unitarity, independent of nuclear models. Nab utilizes a novel, long asymmetric spectrometer that guides the decay electron and proton to two large area silicon detectors in order to precisely determine the electron energy and an estimation of the proton momentum from the proton time of flight. The Nab spectrometer is being commissioned at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source at Oak Ridge National Lab. We present an overview of the Nab experiment and recent updates on the spectrometer, analysis, and systematic effects.

Published
2019
Full Text
View/download PDF

47. Pro Hausgeburt

Author

Linder, R., Bässler, S., Hepp, Hermann, editor, Berg, Dietrich, editor, and Hasbargen, Uwe, editor

Published
1996
Full Text
View/download PDF

48. Short-range fundamental forces

Author

Antoniadis, I., Baessler, S., Büchner, M., Fedorov, V.V., Hoedl, S., Lambrecht, A., Nesvizhevsky, V.V., Pignol, G., Protasov, K.V., Reynaud, S., and Sobolev, Yu.

Published
2011
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results