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1. Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis

Author

Heine, M., Typel, S., Wu, M. -R., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Crespo, R., Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Diaz, D. Gonzalez, Hagdahl, J., Heftrich, T., Heil, M., Heinz, A., Henriques, A., Holl, M., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Bleis, T. Le, Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Martínez-Pinedo, G., Maroussov, V., Mostazo, M., Movsesyan, A., Najafi, A., Neff, T., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., del Rio, J. Sanchez, Savran, D., Scheit, H., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J. T., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., and Zuber, K.

Subjects
Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics
Abstract

With the R$^{3}$B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of $^{18}$C at a projectile energy around 425~AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of $^{17}$C into the ground state of $^{18}$C. Those data have been used to constrain theoretical calculations for transitions populating excited states in $^{18}$C. This allowed to derive the astrophysical cross section $\sigma^{*}_{\mathrm{n}\gamma}$ accounting for the thermal population of $^{17}$C target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures $T_{9}\leq{}1$~GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced influence of neutron capture of $^{17}$C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.

Published
2016
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2. Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes

Author

Thies, R., Heinz, A., Adachi, T., Aksyutina, Y., Alcantara-Núñes, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Crespo, R., Datta, U., Fernández, P. Díaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estradé, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Diaz, D. Gonzalez, Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Henriques, A., Holl, M., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Bleis, T. Le, Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Maroussov, V., Mostazo, M., Movsesyan, A., Najafi, A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., del Rio, J. Sanchez, Savran, D., Scheit, H., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J. T., Tengblad, O., Terashima, S., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., and Zuber, K.

Subjects
Nuclear Experiment
Abstract

Background: Models describing nuclear fragmentation and fragmentation-fission deliver important input for planning nuclear physics experiments and future radioactive ion beam facilities. These models are usually benchmarked against data from stable beam experiments. In the future, two-step fragmentation reactions with exotic nuclei as stepping stones are a promising tool to reach the most neutron-rich nuclei, creating a need for models to describe also these reactions. Purpose: We want to extend the presently available data on fragmentation reactions towards the light exotic region on the nuclear chart. Furthermore, we want to improve the understanding of projectile fragmentation especially for unstable isotopes. Method: We have measured projectile fragments from 10,12-18C and 10-15B isotopes colliding with a carbon target. These measurements were all performed within one experiment, which gives rise to a very consistent dataset. We compare our data to model calculations. Results: One-proton removal cross sections with different final neutron numbers (1pxn) for relativistic 10,12-18C and 10-15B isotopes impinging on a carbon target. Comparing model calculations to the data, we find that EPAX is not able to describe the data satisfactorily. Using ABRABLA07 on the other hand, we find that the average excitation energy per abraded nucleon needs to be decreased from 27 MeV to 8.1 MeV. With that decrease ABRABLA07 describes the data surprisingly well. Conclusions: Extending the available data towards light unstable nuclei with a consistent set of new data have allowed for a systematic investigation of the role of the excitation energy induced in projectile fragmentation. Most striking is the apparent mass dependence of the average excitation energy per abraded nucleon. Nevertheless, this parameter, which has been related to final-state interactions, requires further study.

Published
2016
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3. Beyond the Neutron Drip-Line: The Unbound Oxygen Isotopes 25O and 26O

Author

Caesar, C., Simonis, J., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Diaz, D. Gonzalez, Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Holt, J. D., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Labiche, M., Langer, C., Bleis, T. Le, Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Maroussov, V., Menéndez, J., Mostazo, M., Movsesyan, A., Najafi, A., Nilsson, T., Nociforo, C., Panin, V., Perea, A., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D. M., del Rio, J. Sanchez, Savran, D., Scheit, H., Schwenk, A., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., Zoric, M., Zuber, K., and collaboration, R3B

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The very neutron-rich oxygen isotopes 25O and 26O are investigated experimentally and theoret- ically. In this first R3B-LAND experiment, the unbound states are populated at GSI via proton- knockout reactions from 26F and 27F at relativistic energies around 450 MeV/nucleon. From the kinematically complete measurement of the decay into 24O plus one or two neutrons, the 25O ground- state energy and lifetime are determined, and upper limits for the 26O ground state are extracted. In addition, the results provide evidence for an excited state in 26O at around 4 MeV. The ex- perimental findings are compared to theoretical shell-model calculations based on chiral two- and three-nucleon (3N) forces, including for the first time residual 3N forces, which are shown to be amplified as valence neutrons are added.

Published
2012
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4. 13,14B(n, γ) via Coulomb Dissociation for Nucleosynthesis towards the r-Process

Author

Altstadt, S.G., Adachi, T., Aksyutina, Y., Alcantara, J., Alvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C.A., Boretzky, K., Borge, M.J.G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Datta Pramanik, U., Diaz Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L.M., Freer, M., Freudenberger, M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Holt, J.D., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H.T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lepyoshkina, O., Machado, J., Marganiec, J., Maroussov, V., Menéndez, J., Mostazo, M., Movsesyan, A., Najafi, M.A., Nilsson, T., Nociforo, C., Panin, V., Perea, A., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M.V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez del Rio, J., Savran, D., Scheit, H., Schwenk, A., Simon, H., Simonis, J., Sonnabend, K., Sorlin, O., Stoica, V., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J.S., Woods, P., Yakorev, D., Zhukov, M.V., Zilges, A., Zoric, M., and Zuber, K.

Published
2014
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5. Quasi-free proton knockout from 12C on carbon target at 398 MeV/u

Author

Panin, V., Holl, M., Taylor, J.T., Aksyutina, Y., Alvarez-Pol, H., Aumann, T., Bertulani, C.A., Boretzky, K., Caesar, C., Chartier, M., Chulkov, L.V., Cortina-Gil, D., Enders, J., Ershova, O., Geissel, H., Gernhäuser, R., Heil, M., Johansson, H.T., Jonson, B., Kelić-Heil, A., Kiselev, O., Langer, C., Le Bleis, T., Lemmon, R., Nilsson, T., Paschalis, S., Petri, M., Plag, R., Reifarth, R., Rossi, D., Scheit, H., Simon, H., Wamers, F., Weick, H., and Wimmer, C.

Published
2019
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6. Quasi-free proton knockout from C on carbon target at 398 MeV/u

Author

Panin, V., Holl, M., Taylor, J.T., Aksyutina, Y., Alvarez-Pol, H., Aumann, T., Bertulani, C.A., Boretzky, K., Caesar, C., Chartier, M., Chulkov, L.V., Cortina-Gil, D., Enders, J., Ershova, O., Geissel, H., Gernhäuser, R., Heil, M., Johansson, H.T., Jonson, B., Kelić-Heil, A., Kiselev, O., Langer, C., Le Bleis, T., Lemmon, R., Nilsson, T., Paschalis, S., Petri, M., Plag, R., Reifarth, R., Rossi, D., Scheit, H., Simon, H., Wamers, F., Weick, H., and Wimmer, C.

Abstract

The proton-removal mechanism of the $^{12}$C→11B reaction induced on a carbon target via elementary nucleon-nucleon scattering is investigated in exclusive triple-coincidence measurements. The observed two-nucleon angular correlations are found to be consistent with quasi-free scattering of a projectile-like proton off a target-like nucleon. Exclusive cross sections for one-step pp and pn interactions are determined as σpp=17.2(12) mb and σpn=18.2(18), respectively. The extracted quasi-free component amounts up to 58(4)% of the total proton-removal cross section. The results are compared to total proton-removal cross sections obtained from the experiment and eikonal reaction theory.

Published
2019

7. Structure of $^{13}$Be studied in proton knockout from $^{14}$B

Author

Ribeiro, G., Nácher, E., Tengblad, O., Díaz Fernández, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kröll, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M. V., Zilges, A., Zuber, K., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), R$^3$B, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
radioactive beams, nuclear structure, Nuclear Theory, Aucun, 13Be, Nuclear Reactions, unbound nuclei, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Physical review / C 98(2), 024603 (2018). doi:10.1103/PhysRevC.98.024603, Published by Inst., Woodbury, NY

Published
2018

8. Structure of Be13 studied in proton knockout from B14

Author

Ribeiro, G., Nácher, E., Tengblad, O., Díaz Fernández, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kröll, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M. V., Zilges, A., and Zuber, K.

Subjects
ddc
Published
2018

9. Structure of Be-13 studied in proton knockout from B-14

Author

Ribeiro, G., Nacher, E., Tengblad, O., Diaz Fernandez, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V, Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Pramanik, U. Datta, Dillmann, I, Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhaeuser, R., Golubev, P., Goebel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kroell, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V, Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Roeder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I, Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M., V, Zilges, A., Zuber, K., Ribeiro, G., Nacher, E., Tengblad, O., Diaz Fernandez, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V, Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Pramanik, U. Datta, Dillmann, I, Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhaeuser, R., Golubev, P., Goebel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kroell, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V, Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Roeder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I, Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M., V, Zilges, A., and Zuber, K.

Abstract

The neutron-unbound isotope Be-13 has been studied in several experiments using different reactions, different projectile energies, and different experimental setups. There is, however, no real consensus in the interpretation of the data, in particular concerning the structure of the low-lying excited states. Gathering new experimental information, which may reveal the Be-13 structure, is a challenge, particularly in light of its bridging role between Be-12, where the N = 8 neutron shell breaks down, and the Borromean halo nucleus Be-14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be-12 after proton knockout from B-14, by measuring coincidences between Be-12, neutrons, and gamma rays originating from de-excitation of states fed by neutron decay of Be-13. The Be-13 isotopes were produced in proton knockout from a 400 MeV/nucleon B-14 beam impinging on a CH2 target. The Be-12-n relative-energy spectrum d sigma/dE(fn) was obtained from coincidences between Be-12(g.s.) and a neutron, and also as threefold coincidences by adding gamma rays, from the de-excitation of excited states in Be-12. Neutron decay from the first 5/2(+) state in Be-13 to the 2(+) state in Be-12 at 2.11 MeV is confirmed. An energy independence of the proton-knockout mechanism is found from a comparison with data taken with a 35 MeV/nucleon B-14 beam. A low-lying p-wave resonance in Be-13(1/2(-)) is confirmed by comparing proton- and neutron-knockout data from B-14 and Be-14.

Published
2018

10. Structure of 13Be studied in proton knockout from 14B

Author

Ribeiro, G., Nacher, E., Tengblad, O., Diaz Fernandez, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kröll, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M. V., Zilges, A., Zuber, K., Ribeiro, G., Nacher, E., Tengblad, O., Diaz Fernandez, P., Aksyutina, Y., Alvarez-Pol, H., Atar, L., Aumann, T., Avdeichikov, V., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boillos, J. M., Boretzky, K., Borge, M. J. G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chartier, M., Chulkov, L., Cortina-Gil, D., Cravo, E., Crespo, R., Datta Pramanik, U., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Göbel, K., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Hufnagel, A., Ignatov, A., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Kurz, N., Kröll, T., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lindberg, S., Machado, J., Marganiec, J., Movsesyan, A., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Reifarth, R., Rigollet, C., Riisager, K., Rossi, D., Röder, M., Savran, D., Scheit, H., Simon, H., Sorlin, O., Syndikus, I., Taylor, J. T., Thies, R., Velho, P., Wagner, A., Wamers, F., Vandebrouck, M., Weick, H., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Zhukov, M. V., Zilges, A., and Zuber, K.

Abstract

The neutron-unbound isotope 13Be has been studied in several experiments using different reactions, different projectile energies and different experimental setups. There is, however, no real consensus in the interpretation of the data, in particular concerning the structure of the low-lying excited states. Gathering new experimental information, which may reveal the 13Be structure, is a challenge, in particular in light of its bridging role between 12Be, where the N=8 neutron-shell breaks down, and the Borromean halo nucleus 14Be. The purpose of the present study is to investigate the role of bound excited states in the reaction product 12Be after proton knockout from 14B, by measuring coincidences between 12Be, neutrons, and rays originating from de-excitation of states fed by neutron decay of 13Be. The 13Be isotopes were produced in proton-knockout from a 400 MeV/u 14B beam impinging on a CH2 target. The 12Be-n relative-energy spectrum dsigma=dEfn was obtained from coincidences between 12Be(g.s.) and a neutron, and also as threefold coincidences by adding rays, from the de-excitation of excited states in 12Be. Neutron decay from the first 5=2+ state in 13Be to the 2+ state in 12Be at 2.11 MeV is cofirmed. An energy-independence of the proton-knockout mechanism is found from a comparison with data taken with a 35 MeV/u 14B beam. A low-lying p-wave resonance in 13Be(1/2+) is confirmed by comparing proton- and neutron-knockout data from 14B and 14Be.

Published
2018

11. Determination of the neutron-capture rate of C-17 for r-process nucleosynthesis

Author

Heine, M, Typel, S, Wu, M-R, Adachi, T, Aksyutina, Y, Alcantara, J, Altstadt, S, Alvarez-Pol, H, Ashwood, N, Atar, L, Aumann, T, Avdeichikov, V, Barr, M, Beceiro-Novo, S, Bemmerer, D, Benlliure, J, Bertulani, CA, Boretzky, K, Borge, MJG, Burgunder, G, Caamano, M, Caesar, C, Casarejos, E, Catford, W, Cederkaell, J, Chakraborty, S, Chartier, M, Chulkov, LV, Cortina-Gil, D, Crespo, R, Pramanik, U Datta, Fernandez, P Diaz, Dillmann, I, Elekes, Z, Enders, J, Ershova, O, Estrade, A, Farinon, F, Fraile, LM, Freer, M, Freudenberger, M, Fynbo, HOU, Galaviz, D, Geissel, H, Gernhaeuser, R, Goebel, K, Golubev, P, Diaz, D Gonzalez, Hagdahl, J, Heftrich, T, Heil, M, Heinz, A, Henriques, A, Holl, M, Ickert, G, Ignatov, A, Jakobsson, B, Johansson, HT, Jonson, B, Kalantar-Nayestanaki, N, Kanungo, R, Kelic-Heil, A, Knoebel, R, Kroell, T, Kruecken, R, Kurcewicz, J, Kurz, N, Labiche, M, Langer, C, Le Bleis, T, Lemmon, R, Lepyoshkina, O, Lindberg, S, Machado, J, Marganiec, J, Martinez-Pinedo, G, Maroussov, V, Mostazo, M, Movsesyan, A, Najafi, A, Neff, T, Nilsson, T, Nociforo, C, Panin, V, Paschalis, S, Perea, A, Petri, M, Pietri, S, Plag, R, Prochazka, A, Rahaman, A, Rastrepina, G, Reifarth, R, Ribeiro, G, Ricciardi, MV, Rigollet, C, Riisager, K, Roeder, M, Rossi, D, del Rio, J Sanchez, Savran, D, Scheit, H, Simon, H, Sorlin, O, Stoica, V, Streicher, B, Taylor, JT, Tengblad, O, Terashima, S, Thies, R, Togano, Y, Uberseder, E, Van de Walle, J, Velho, P, Volkov, V, Wagner, A, Wamers, F, Weick, H, Weigand, M, Wheldon, C, Wilson, G, Wimmer, C, Winfield, JS, Woods, P, Yakorev, D, Zhukov, MV, Zilges, A, Zuber, K, and Collaboration, R3B

Published
2017

12. Determination of the neutron-capture rate of C-17 for r-process nucleosynthesis

Author

Heine, M., Typel, S., Wu, M. -R., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Álvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C.A, Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkaell, J., Chakraborty, S., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Crespo, Raquel, Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhaeuser, R., Göbel, K., Golubev, P., Diaz, D. Gonzalez, Hagdahl, J., and Riisager, K.

Subjects
EJECTA, LIGHT, ELEMENTS, NUCLEAR-PHYSICS, DISSOCIATION, Nuclear Experiment, METAL-POOR, RICH, DETECTOR, RELATIVISTIC HEAVY-IONS, COSMOCHRONOLOGY
Abstract

With the (RB)-B-3-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of C-18 at a projectile energy around 425A MeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of C-17 into the ground state of C-18. Those data have been used to constrain theoretical calculations for transitions populating excited states in C-18. This allowed to derive the astrophysical cross section sigma(n gamma)*. accounting for the thermal population of C-17 target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures T-9

Published
2017

13. Determination of the neutron-capture rate of 17C for r-process nucleosynthesis

Author

Heine, M. (Marcel), Typel, S., Wu, M.-R., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Crespo, R., Datta Pramanik, U., Diaz Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heinz, A., Henriques, A., Holl, M., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Martínez-Pinedo, G., Maroussov, V., Mostazo, M., Movsesyan, A., Najafi, A., Neff, T., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez del Rio, J., Savran, D., Scheit, H., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J. T., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., and Zuber, K.

Subjects
Aucun
Published
2017

14. Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis

Author

Heine, M, Typel, S, Wu, M-R, Adachi, T, Aksyutina, Y, Alcantara, J, Altstadt, S, Alvarez-Pol, H, Ashwood, N, Aumann, T, Avdeichikov, V, Barr, M, Beceiro-Novo, S, Bemmerer, D, Benlliure, J, Bertulani, CA, Catford, Wilton, and Wilson, G

Subjects
Nuclear Experiment
Abstract

With the R3B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of 18C at a projectile energy around 425 AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of 17C into the ground state of 18C. Those data have been used to constrain theoretical calculations for transitions populating excited states in 18C. This allowed to derive the astrophysical cross section n accounting for the thermal population of 17C target states in astrophysical scenarios. The experimentally veri ed capture rate is signi cantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures T9 1 GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced in uence of neutron capture of 17C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.

Published
2017

15. Determination of the Neutron-Capture Rate of $^{17}$C for the R-process Nucleosynthesis

Author

Heine, M., Typel, S., Wu, M. -R, Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro-Novo, S., Daniel Bemmerer, Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Crespo, R., Datta Pramanik, U., Diaz Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heinz, A., Henriques, A., Holl, M., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Martínez-Pinedo, G., Maroussov, V., Mostazo, M., Movsesyan, A., Najafi, A., Neff, T., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez Del Rio, J., Savran, D., Scheit, H., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J. T., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., Zuber, K., Helmholtz zentrum für Schwerionenforschung GmbH (GSI), KVI-CART, University of Groningen, University of Groningen [Groningen], Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), R3B Collaboration, Research unit Nuclear & Hadron Physics, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
astro-ph.SR, Astrophysics - Solar and Stellar Astrophysics, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

International audience; With the R$^{3}$B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of $^{18}$C at a projectile energy around 425~AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of $^{17}$C into the ground state of $^{18}$C. Those data have been used to constrain theoretical calculations for transitions populating excited states in $^{18}$C. This allowed to derive the astrophysical cross section $\sigma^{*}_{\mathrm{n}\gamma}$ accounting for the thermal population of $^{17}$C target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures $T_{9}\leq{}1$~GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced influence of neutron capture of $^{17}$C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.

Published
2017

16. Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis

Author

Heine, M., Typel, S., Wu, M.-R., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Avdeichikov, T. A. V., Barr, M., Beceiro-Novo, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L. V., Cortina-Gil, D., Crespo, R., Datta Pramanik, U., Diaz Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Göbel, K., Golubev, P., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heinz, A., Henriques, A., Holl, M., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Martínez-Pinedo, G., Maroussov, V., Mostazo, M., Movsesyan, A., Najafi, A., Neff, T., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez Del Rio, J., Savran, D., Scheit, H., Simon, H., Sorlin (Ganil), O., Stoica, V., Streicher, B., Taylor, J. T., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., and Zuber, K.

Subjects
r-process, nucleosynthesis, Coulomb dissociation, Nuclear Experiment, radiative neutron capture
Abstract

With the R3B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of 18C at a projectile energy around 425~AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of 17C into the ground state of 18C. Those data have been used to constrain theoretical calculations for transitions populating excited states in 18C. This allowed to derive the astrophysical cross section σ∗nγ accounting for the thermal population of 17C target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures T9≤1~GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced influence of neutron capture of 17C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.

Published
2017

17. Exclusive measurements of quasi-free proton scattering reactions in inverse and complete kinematics

Author

Panin, V., Taylor, J.T., Paschalis, S., Wamers, F., Aksyutina, Y., Alvarez-Pol, H., Aumann, T., Bertulani, C.A., Boretzky, K., Caesar, C., Chartier, M., Chulkov, L.V., Cortina-Gil, D., Enders, J., Ershova, O., Geissel, H., Gernhäuser, R., Heil, M., Johansson, H.T., Jonson, B., Kelić-Heil, A., Langer, C., Le Bleis, T., Lemmon, R., Nilsson, T., Petri, M., Plag, R., Reifarth, R., Rossi, D., Scheit, H., Simon, H., Weick, H., and Wimmer, C.

Published
2016
Full Text
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18. Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes

Author

Thies, R, Heinz, A, Adachi, T, Aksyutina, Y, Alcantara-Nunes, J, Altstadt, S, Alvarez-Pol, H, Ashwood, N, Aumann, T, Avdeichikov, V, Barr, M, Beceiro-Novo, S, Bemmerer, D, Benlliure, J, Bertulani, CA, Boretzky, K, Borge, MJG, Burgunder, G, Camano, M, Caesar, C, Casarejos, E, Catford, W, Cederkall, J, Chakraborty, S, Chartier, M, Chulkov, LV, Cortina-Gil, D, Crespo, R, Datta, U, Diaz Fernandez, P, Dillmann, I, Elekes, Z, Enders, J, Ershova, O, Estrade, A, Farinon, F, Fraile, LM, Freer, M, Freudenberger, M, Fynbo, HOU, Galaviz, D, Geissel, H, Gernhauser, R, Gobel, K, Golubev, P, Diaz, DG, Hagdahl, J, Heftrich, T, Heil, M, Heine, M, Henriques, A, Holl, M, Ickert, G, Ignatov, A, Jakobsson, B, Johansson, HT, Jonson, B, Kalantar-Nayestanaki, N, Kanungo, R, Knobel, R, Kroll, T, Krucken, R, Kurcewicz, J, Kurz, N, Labiche, M, Langer, C, Le Bleis, T, Lemmon, R, Lepyoshkina, O, Lindberg, S, Machado, J, Marganiec, J, Maroussov, V, Mostazo, M, Movsesyan, A, Najafi, A, Nilsson, T, Nociforo, C, Panin, V, Paschalis, S, Perea, A, Petri, M, Pietri, S, Plag, R, Prochazka, A, Rahaman, A, Rastrepina, G, Reifarth, R, Ribeiro, G, Ricciardi, MV, Rigollet, C, Riisager, K, Roder, M, Rossi, D, Sanchez del Rio, J, Savran, D, Scheit, H, Simon, H, Sorlin, O, Stoica, V, Streicher, B, Taylor, JT, Tengblad, O, Terashima, S, Togano, Y, Uberseder, E, Van de Walle, J, Velho, P, Volkov, V, Wagner, A, Wamers, F, Weick, H, Weigand, M, Wheldon, C, Wilson, G, Wimmer, C, Winfield, JS, Woods, P, Yakorev, D, Zhukov, MV, Zilges, A, Zuber, K, Collaboration, R, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), R3B Collaboration, KVI - Center for Advanced Radiation Technology, Research unit Nuclear & Hadron Physics, Federal Ministry of Education and Research (Germany), Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Science and Technology Facilities Council (UK), Department of Energy (US), Ministerio de Economía y Competitividad (España), Swedish Research Council, Helmholtz Centre for Heavy Ion Research, National Science Foundation (US), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Ion beam, 010308 nuclear & particles physics, Fission, Projectile, Nuclear Theory, Fragmentation (computing), Aucun, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, nuclear fragmentation fission radioactive ion beam facilities C10 C12−18 B10−15 isotope, 0103 physical sciences, Neutron, Física nuclear, Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment, Excitation, Beam (structure)
Abstract

R. Thies et al.; 9 pags., 7 figs., 1 tab., Background: Models describing nuclear fragmentation and fragmentation fission deliver important input for planning nuclear physics experiments and future radioactive ion beam facilities. These models are usually benchmarked against data from stable beam experiments. In the future, two-step fragmentation reactions with exotic nuclei as stepping stones are a promising tool for reaching the most neutron-rich nuclei, creating a need for models to describe also these reactions. Purpose: We want to extend the presently available data on fragmentation reactions towards the light exotic region on the nuclear chart. Furthermore, we want to improve the understanding of projectile fragmentation especially for unstable isotopes. Method: We have measured projectile fragments from C10,12-18 and B10-15 isotopes colliding with a carbon target. These measurements were all performed within one experiment, which gives rise to a very consistent data set. We compare our data to model calculations. Results: One-proton removal cross sections with different final neutron numbers (1pxn) for relativistic C10,12-18 and B10-15 isotopes impinging on a carbon target. Comparing model calculations to the data, we find that the epax code is not able to describe the data satisfactorily. Using abrabla07 on the other hand, we find that the average excitation energy per abraded nucleon needs to be decreased from 27 MeV to 8.1 MeV. With that decrease abrabla07 describes the data surprisingly well. Conclusions: Extending the available data towards light unstable nuclei with a consistent set of new data has allowed a systematic investigation of the role of the excitation energy induced in projectile fragmentation. Most striking is the apparent mass dependence of the average excitation energy per abraded nucleon. Nevertheless, this parameter, which has been related to final-state interactions, requires further study. ©2016 American Physical Society, We thank the FRS and the GSI accelerator staff for their efforts. This work was supported by the Swedish Research Council. O.T. was supported by the Spanish Research Council under project FPA2012-32443, C.A.B. acknowledges support from the U.S. DOE Grant No. DE-FG02-08ER41533 and the U.S. NSF Grant No. 1415656. L.M.F. acknowledges support by the Spanish Research Council under project FPA2013-41267-P and M.R. was supported by GSI (F&E, DR-ZUBE), German BMBF (06DR134I and 05P09CRFN5), the Nuclear Astrophysics Virtual Institute (NAVI, HGF VHVI- 417) and the Helmholtz Association Detector Technology and Systems Platform. T.K. acknowledges support by the German BMBF No. 06DA9040I, No. 05P12RDFN8, and No. 05P15RDFN1. C.W. acknowledges funding by the UK STFC No. ST/E500651/1, while N.A. and M.F. acknowledge funding by the UK STFC No. ST/F011989/1.

Published
2016

19. Coulomb dissociation of N 20,21

Author

Röder, M., Adachi, T., Aksyutina, Y., Alcántara, J., Altstadt, S., Álvarez-Pol, H., Beceiro, S., Benlliure, J., García Borge, María José, Caamaño, M., Casarejos, E., Cortina-Gil, D., Díaz-Fernández, P., Fraile, Luis M., Mostazo Caro, M., Ribeiro, Guillermo, Sánchez del Río, José, Tengblad, Olof, Helmholtz Centre for Heavy Ion Research, Swedish Research Council, Ministerio de Economía y Competitividad (España), Nuclear Astrophysics Virtual Institute (Germany), Fundação para a Ciência e a Tecnologia (Portugal), Science and Technology Facilities Council (UK), Department of Energy (US), Federal Ministry of Education and Research (Germany), and Helmholtz International Center for FAIR

Abstract

Marko Röder et al. ; 11 págs.; 10 figs.; 2 tabs., Neutron-rich light nuclei and their reactions play an important role in the creation of chemical elements. Here, data from a Coulomb dissociation experiment on N20,21 are reported. Relativistic N20,21 ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the N19(n,γ)N20 and N20(n,γ)N21 excitation functions and thermonuclear reaction rates have been determined. The N19(n,γ)N20 rate is up to a factor of 5 higher at T, This work was supported in part by GSI (F&E, DRZUBE), Bundesministerium f¨ur Bildung und Forschung (BMBF) (06DR134I, 05P09CRFN5, 05P12RDFN8, and 05P15RDFN1), the Hemholtz Association Germany through the Nuclear Astrophysics Virtual Institute (NAVI, Grant No. VH-VI-417), the Helmholtz Association Detector Technology and Systems Platform, the Spanish Research funding agency under projects FPA2012-32443, FPA2013- 41267-P, and FPA2013-47831-C2-1-P, the Swedish Research Council, HIC for FAIR and the TUDarmstadt-GSI cooperation contract, the Portuguese FCTproject PTDC/FIS/103902/2008, UK STFC under grants ST/E500651/1 and ST/F011989/1, US NSF Grant No. 1415656, and US DOE Grant No. DE-FG02- 08ER41533

Published
2016

20. Coulomb dissociation of N-20,N-21

Author

Röder, M., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C., Boretzky, K., Borge, M., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Crespo, R., Pramanik, U., Diaz-Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L., Freer, M., Freudenberger, M., Fynbo, H., Galaviz, D., Geissel, H., Gernhauser, R., Gobel, K., Golubev, P., Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knobel, R., Kroll, T., Krucken, R., Kurcewicz, J., Kurz, N., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Caro, M., Movsesyan, A., Najafi, M., Nilsson, T., Nociforo, C., Panin, V., Paschalis, S., Perea, A., Petri, M., Pietri, S., Plag, R., Prochazka, A., Rahaman, M., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M., Rigollet, C., Riisager, K., Rossi, D., Saez, J., Savran, D., Scheit, H., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J., Woods, P., Yakorev, D., Zhukov, M., Zilges, A., and Zuber, K.

Subjects
Astrophysics::High Energy Astrophysical Phenomena
Abstract

Neutron-rich light nuclei and their reactions play an important role in the creation of chemical elements. Here, data from a Coulomb dissociation experiment on N-20,N-21 are reported. Relativistic N-20,N-21 ions impinged on a lead target and the Coulomb dissociation cross section was determined in a kinematically complete experiment. Using the detailed balance theorem, the N-19(n,gamma)N-20 and N-20(n,gamma)N-21 excitation functions and thermonuclear reaction rates have been determined. The N-19(n,gamma)N-20 rate is up to a factor of 5 higher at T < 1 GK with respect to previous theoretical calculations, leading to a 10% decrease in the predicted fluorine abundance.

Published
2016

21. Experimental study of the O-15(2p, gamma) Ne-17 cross section by Coulomb Dissociation for the rp process

Author

Marganiec, J., Wamers, F., Aksouh, F., Aksyutina, Y., Pol, H. Alvarez, Aumann, T., Beceiro, S., Bertulani, Carlos, Boretzky, K., Borge, M. J. G., Chartier, M., Chatillon, A., Chulkov, L., Cortina-Gil, D., Egorova, I., Emling, H., Ershova, O., Forssén, C, Fraile, L. M., Fynbo, H., Galaviz, D., Geissel, H., Grigorenko, L., Heil, M., Hoffmann, D. H. H., Hoffmann, J., Johansson, H., Jonson, B., Karakoc, M., Karagiannis, C., Kiselev, O.A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C, Lantz, M., Larsson, K., Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Muentz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Parfenova, Yu, Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez-Tajes, C., Rossi, D., Schrieder, G., Shulgina, N., Simon, H., Stroth, J., Suemmerer, K., Taylor, J., Tengblad, O., Tengborn, E., Weick, H., Wiescher, M., Wimmer, C., and Zhukov, M.

Subjects
CAPTURE, Nuclear Experiment, RADII
Abstract

The time-reversed reaction O-15(2p, gamma) Ne-17 has been studied by the Coulomb dissociation technique. Secondary 17Ne ion beams at 500 AMeV have been produced by fragmentation reactions of Ne-20 in a beryllium production target and dissociated on a secondary Pb target. The incoming beam and the reaction products have been identified with the kinematically complete LAND-(RB)-B-3 experimental setup at GSI. The excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb Dissociation cross sections (sigma(Coul)) have been calculated, which provide a photoabsorption (sigma(photo)) and a radiative capture cross section (sigma(cap)). Additionally, important information about the nuclear structure of the Ne-17 nucleus will be obtained. The analysis is in progress.

Published
2016

22. Experimental study of the 15O(2p ,γ)17Ne cross section by Coulomb Dissociation for the rp process

Author

Marganiec, J, Warners, F, Aksouh, F, Aksyutina, Y, Pol, H Alvarez, Aumann, T, Beceiro, S, Bertulani, C, Boretzky, K, Borge, M J, Chartier, M, Chatillon, A, Chulkov, L, Cortina-Gil, D, Egorova, I, Emling, H, Ershova, O, Forssén, C, Fraile, L M, Fynbo, H, Galaviz, D, Geissel, H, Grigorenko, L, Heil, M, Hoffmann, D H H, Hoffmann, J, Johansson, H, Jonson, B, Karakoç, M, Karagiannis, C, Kiselev, O, Kratz, J V, Kulessa, R, Kurz, N, Langer, C, Lantz, Mattias, Larsson, K, Bleis, T Le, Lemmon, R, Litvinov, Yu A, Mahata, K, MÌntz, C, Nilsson, T, Nociforo, C, Nyman, G, Ott, W, Panin, V, Parfenova, Yu, Paschalis, S, Perea, A, Plag, R, Reifarth, R, Richter, A, Riisager, K, Tajes, C Rodríguez, Rossi, D, Schrieder, G, Shulgina, N, Simon, H, Stroth, J, SÌmmerer, K, Taylor, J, Tengblad, O, Tengborn, E, Weick, H, Wiescher, M, Wimmer, C, Zhukov, M, Marganiec, J, Warners, F, Aksouh, F, Aksyutina, Y, Pol, H Alvarez, Aumann, T, Beceiro, S, Bertulani, C, Boretzky, K, Borge, M J, Chartier, M, Chatillon, A, Chulkov, L, Cortina-Gil, D, Egorova, I, Emling, H, Ershova, O, Forssén, C, Fraile, L M, Fynbo, H, Galaviz, D, Geissel, H, Grigorenko, L, Heil, M, Hoffmann, D H H, Hoffmann, J, Johansson, H, Jonson, B, Karakoç, M, Karagiannis, C, Kiselev, O, Kratz, J V, Kulessa, R, Kurz, N, Langer, C, Lantz, Mattias, Larsson, K, Bleis, T Le, Lemmon, R, Litvinov, Yu A, Mahata, K, MÌntz, C, Nilsson, T, Nociforo, C, Nyman, G, Ott, W, Panin, V, Parfenova, Yu, Paschalis, S, Perea, A, Plag, R, Reifarth, R, Richter, A, Riisager, K, Tajes, C Rodríguez, Rossi, D, Schrieder, G, Shulgina, N, Simon, H, Stroth, J, SÌmmerer, K, Taylor, J, Tengblad, O, Tengborn, E, Weick, H, Wiescher, M, Wimmer, C, and Zhukov, M

Abstract

The time-reversed reaction 15O(2p,γ)17Ne has been studied by the Coulomb dissociation technique. Secondary 17Ne ion beams at 500 AMeV have been produced by fragmentation reactions of 20Ne in a beryllium production target and dissociated on a secondary Pb target. The incoming beam and the reaction products have been identified with the kinematically complete LAND-R3B experimental setup at GSI. The excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb Dissociation cross sections (σCoul) have been calculated, which provide a photoabsorption (σphoto) and a radiative capture cross section (σcap). Additionally, important information about the nuclear structure of the 17Ne nucleus will be obtained. The analysis is in progress.

Published
2016
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23. Coulomb and nuclear excitations of narrow resonances in 17Ne

Author

Universidade de Santiago de Compostela. Departamento de Física de Partículas, Marganiec, J., Wamers, F., Aksouh, F., Aksyutina, Y., Álvarez Pol, Héctor, Aumann, T., Beceiro Novo, Saúl, Bertulani, C. A., Boretzky, K., Borge, M. J. G., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina Gil, María Dolores, Emling, H., Ershova, O., Fraile, L. M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Heil, M., Hoffmann, D. H. H., Hoffmann, J., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Rodríguez Tajes, Carme, Rossi, D., Riisager, K., Savran, D., Schrieder, G., Simon, H., Stroth, J., Sümmerer, K., Tengblad, O., Typel, S., Weick, H., Wiescher, M., Wimmer, C., Universidade de Santiago de Compostela. Departamento de Física de Partículas, Marganiec, J., Wamers, F., Aksouh, F., Aksyutina, Y., Álvarez Pol, Héctor, Aumann, T., Beceiro Novo, Saúl, Bertulani, C. A., Boretzky, K., Borge, M. J. G., Chartier, M., Chatillon, A., Chulkov, L. V., Cortina Gil, María Dolores, Emling, H., Ershova, O., Fraile, L. M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Heil, M., Hoffmann, D. H. H., Hoffmann, J., Johansson, H. T., Jonson, B., Karagiannis, C., Kiselev, O. A., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Rodríguez Tajes, Carme, Rossi, D., Riisager, K., Savran, D., Schrieder, G., Simon, H., Stroth, J., Sümmerer, K., Tengblad, O., Typel, S., Weick, H., Wiescher, M., and Wimmer, C.

Abstract

New experimental data for dissociation of relativistic 17Ne projectiles incident on targets of lead, carbon, and polyethylene targets at GSI are presented. Special attention is paid to the excitation and decay of narrow resonant states in 17Ne. Distributions of internal energy in the 15O +p +pthree-body system have been determined together with angular and partial-energy correlations between the decay products in different energy regions. The analysis was done using existing experimental data on 17Ne and its mirror nucleus 17N. The isobaric multiplet mass equation is used for assignment of observed resonances and their spins and parities. A combination of data from the heavy and light targets yielded cross sections and transition probabilities for the Coulomb excitations of the narrow resonant states. The resulting transition probabilities provide information relevant for a better understanding of the 17Ne structure.

Published
2016

24. B-13,B-14(n,gamma) via Coulomb Dissociation for Nucleosynthesis towards the r-Process

Author

Altstadt, S. G., Adachi, T., Aksyutina, Y., Alcantara, J., Alvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Cederkall, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhaeuser, R., Goebel, K., Golubev, P., Gonzalez Diaz, D., Kalantar-Nayestanaki, N., Najafi, M. A., Rigollet, C., Stoica, V., Streicher, B., Van de Walle, J., and Research unit Nuclear & Hadron Physics

Subjects
LIGHT
Abstract

Radioactive beams of B-14,B-15 produced by fragmentation of a primary Ar-40 beam were directed onto a Pb target to investigate the neutron breakup within the Coulomb field. The experiment was performed at the LAND/(RB)-B-3 setup. Preliminary results for the Coulomb dissociation cross sections as well as for the astrophysically interesting inverse reactions, B-13,B-14(n,gamma), are presented.

Published
2014

26. 13,14B(n,γ) via Coulomb Dissociation for Nucleosynthesis towards the r-Process

Author

Altstadt, S., Adachi, T., Aksyutina, Y., Alcantara, J., Alvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., and Bemmerer, D.

Subjects
Physics::Accelerator Physics, Nuclear Experiment
Abstract

Radioactive beams of 14,15B produced by fragmentation of a primary 40Ar beam were directed onto a Pb target to investigate the neutron breakup within the Coulomb field. The experiment was performed at the LAND/R3B setup. Preliminary results for the Coulomb dissociation cross sections as well as for the astrophysically interesting inverse reactions, 13,14B(n,γ), are presented.

Published
2014

27. Experimental study of the15O(2p, γ)17Ne cross section by Coulomb Dissociation for therpprocess

Author

Marganiec, J, primary, Warners, F, additional, Aksouh, F, additional, Aksyutina, Y, additional, Pol, H Alvarez, additional, Aumann, T, additional, Beceiro, S, additional, Bertulani, C, additional, Boretzky, K, additional, Borge, M J, additional, Chartier, M, additional, Chatillon, A, additional, Chulkov, L, additional, Cortina-Gil, D, additional, Egorova, I, additional, Emling, H, additional, Ershova, O, additional, Forssén, C, additional, Fraile, L M, additional, Fynbo, H, additional, Galaviz, D, additional, Geissel, H, additional, Grigorenko, L, additional, Heil, M, additional, Hoffmann, D H H, additional, Hoffmann, J, additional, Johansson, H, additional, Jonson, B, additional, Karakoç, M, additional, Karagiannis, C, additional, Kiselev, O, additional, Kratz, J V, additional, Kulessa, R, additional, Kurz, N, additional, Langer, C, additional, Lantz, M, additional, Larsson, K, additional, Bleis, T Le, additional, Lemmon, R, additional, Litvinov, Yu A, additional, Mahata, K, additional, Müntz, C, additional, Nilsson, T, additional, Nociforo, C, additional, Nyman, G, additional, Ott, W, additional, Panin, V, additional, Parfenova, Yu, additional, Paschalis, S, additional, Perea, A, additional, Plag, R, additional, Reifarth, R, additional, Richter, A, additional, Riisager, K, additional, Tajes, C Rodríguez, additional, Rossi, D, additional, Schrieder, G, additional, Shulgina, N, additional, Simon, H, additional, Stroth, J, additional, Sümmerer, K, additional, Taylor, J, additional, Tengblad, O, additional, Tengborn, E, additional, Weick, H, additional, Wiescher, M, additional, Wimmer, C, additional, and Zhukov, M, additional

Published
2016
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28. Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26

Author

Caesar, C., Simonis, J., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Casarejos, E., Catford, W., Cederkaell, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Pramanik, U. Datta, Fernandez, P. Diaz, Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhaeuser, R., Golubev, P., Diaz, D. Gonzalez, Hagdahl, J., Heftrich, T., Heil, M., Kalantar-Nayestanaki, N., Rigollet, C., Streicher, B., Van de Walle, J., and KVI - Center for Advanced Radiation Technology

Subjects
Nuclear Theory, RICH NUCLEI, PARTICLE STABILITY, Nuclear Experiment, DETECTOR, RELATIVISTIC HEAVY-IONS
Abstract

The very neutron-rich oxygen isotopes O-25 and O-26 are investigated experimentally and theoretically. The unbound states are populated in an experiment performed at the R3B-LAND setup at GSI via proton-knockout reactions from F-26 and F-27 at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into O-24 plus one or two neutrons, the O-25 ground-state energy and width are determined, and upper limits for the O-26 ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in O-26 at around 4 MeV. The experimental findings are compared to theoretical shell-model calculations based on chiral two- and three-nucleon (3N) forces, including for the first time residual 3N forces, which are shown to be amplified as valence neutrons are added.

Published
2013

29. Beyond the neutron drip line: The unbound oxygen isotopes O and O

Author

Caesar, C., Simonis, J., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Casarejos, E., Catford, W., Cederkäll, J., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Datta Pramanik, U., Diaz Fernandez, P., Dillmann, I., Elekes, Z., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Fynbo, H. O. U., Galaviz, D., Geissel, H., Gernhäuser, R., Golubev, P., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Heinz, A., Henriques, A., Holl, M., Holt, J. D., Ickert, G., Ignatov, A., Jakobsson, B., Johansson, H. T., Jonson, B., Kalantar-Nayestanaki, N., Kanungo, R., Kelic-Heil, A., Knöbel, R., Kröll, T., Krücken, R., Kurcewicz, J., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Lepyoshkina, O., Lindberg, S., Machado, J., Marganiec, J., Maroussov, V., Menéndez, J., Mostazo, M., Movsesyan, A., Najafi, A., Nilsson, T., Nociforo, C., Panin, V., Perea, A., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez del Rio, J., Savran, D., Scheit, H., Schwenk, A., Simon, H., Sorlin, O., Stoica, V., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Togano, Y., Uberseder, E., Van de Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J. S., Woods, P., Yakorev, D., Zhukov, M. V., Zilges, A., Zoric, M., and Zuber, K.

Subjects
Aucun
Published
2013

30. Coulomb breakup of 17 Ne from the view point of nuclear astrophysics

Author

Marganiec, J., Aksouh, F., Aksyutina, Y., Álvarez-Pol, H., Aumann, T., Beceiro, S., Bertulani, C., Boretzky, K., García Borge, María José, Chartier, M., Chatillon, A., Chulkov, L., Cortina-Gil, D., Egorova, I., Emling, H., Ershova, O., Forssén, C., Fraile, Luis M., Fynbo, H.O.U., Galaviz, D., Geissel, H., Grigorenko, L., Heil, M., Hoffmann, D.H.H., Hoffmann, J., Johansson, H., Jonson, B., Karagiannis, C., Kiselev, O., Kratz, J.V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Larsson, K., Le Bleis, T., Lemmon, R., Lindahl, A., Litvinov, Yu. A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Parfenova, Yu., Paschalis, S., Perea, Ángel, Plag, R., Reifarth, R., Richter, A., Rodríguez Tajes, C., Rossi, D., Schrieder, G., Shulgina, N., Simon, H., Stroth, J., Sümmerer, K., Taylor, J., Tengblad, Olof, Tengborn, E., Wamers, F., Weick, H., Wimmer, C., Zhukov, M., Federal Ministry of Education and Research (Germany), European Commission, and Helmholtz International Center for FAIR

Subjects
Nuclear physics, Physics, CNO cycle, Ion beam, Coulomb, Nuclear astrophysics, Halo nucleus, rp-process, Atomic physics, Breakup, Nucleon
Abstract

6 pags., 5 figs. -- XII International Symposium on Nuclei in the Cosmos, August 5-12, 2012, Cairns, Australia, By the Coulomb breakup of 17Ne, the time-reversed reaction 15O(2p, γ) 17Ne has been studied. This reaction might play an important role in the rp process, as a break-out reaction of the hot CNO cycle. The secondary 17Ne ion beam with an energy of 500 MeV/nucleon has been dissociated in a Pb target. The reaction products have been detected with the LAND-R3B experimental setup at GSI. The preliminary differential and integral Coulomb dissociation cross section σCoul has been determined, which then will be converted into a photo-absorption cross section σphoto, and a two-proton radiative capture cross section σcap. Additionally, information about the structure of the 17Ne, a potential two-proton halo nucleus, will be received. The analysis is in progress., This project was supported by the German Federal Ministry for Education and Research (BMBF), EU(EURONS), EMMI-GSI, and HIC for FAIR

Published
2012
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31. STUDY OF THE O-15(2p,gamma)Ne-17 CROSS SECTION BY COULOMB DISSOCIATION OF Ne-17 FOR THE rp PROCESS OF NUCLEOSYNTHESIS

Author

Marganiec, J., Wamers, F., Aksouh, F., Aksyutina, Y., Pol, H. Alvarez, Aumann, T., Beceiro, S., Bertulani, C., Boretzky, K., Borge, M. J. G., Chartier, M., Chatillon, A., Chulkov, L., Cortina-Gil, D., Egorova, I., Emling, H., Ershova, O., Forssen, C., Fraile, L. M., Fynbo, H., Galaviz, D., Geissel, H., Grigorenko, L., Heil, M., Hoffmann, D. H. H., Hoffmann, J., Johansson, H., Jonson, B., Karakoc, M., Karagiannis, C., Kiselev, O., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, Mattias, Larsson, K., Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Muentz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Parfenova, Yu., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez Tajes, C., Rossi, D., Schrieder, G., Shulgina, N., Simon, H., Stroth, J., Suemmerer, K., Taylor, J., Tengblad, O., Tengborn, E., Weick, H., Wiescher, M., Wimmer, C., Zhukov, M., Marganiec, J., Wamers, F., Aksouh, F., Aksyutina, Y., Pol, H. Alvarez, Aumann, T., Beceiro, S., Bertulani, C., Boretzky, K., Borge, M. J. G., Chartier, M., Chatillon, A., Chulkov, L., Cortina-Gil, D., Egorova, I., Emling, H., Ershova, O., Forssen, C., Fraile, L. M., Fynbo, H., Galaviz, D., Geissel, H., Grigorenko, L., Heil, M., Hoffmann, D. H. H., Hoffmann, J., Johansson, H., Jonson, B., Karakoc, M., Karagiannis, C., Kiselev, O., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, Mattias, Larsson, K., Le Bleis, T., Lemmon, R., Litvinov, Yu. A., Mahata, K., Muentz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Parfenova, Yu., Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Riisager, K., Rodriguez Tajes, C., Rossi, D., Schrieder, G., Shulgina, N., Simon, H., Stroth, J., Suemmerer, K., Taylor, J., Tengblad, O., Tengborn, E., Weick, H., Wiescher, M., Wimmer, C., and Zhukov, M.

Abstract

The O-15(2p, gamma)Ne-17 cross section has been studied by the inverse reaction, the Coulomb dissociation of Ne-17. The experiment has been performed at the GSI. The Ne-17 excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb dissociation cross sections (sigma(Coul)) have been extracted, which provide a photoabsorption (sigma(photo)) and a radiative capture cross section (sigma(cap)). Additionally, important information about the Ne-17 nuclear structure will be obtained. The analysis is in progress.

Published
2014
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32. Lithium isotopes beyond the drip line

Author

Aksyutina, Y., Johansson, Ht, Adrich, P., Aksouh, F., Aumann, T., Boretzky, K., Borge, Mjg, Chatillon, A., Chulkov, Lv, Cortina-Gil, D., Pramanik, Ud, Emling, H., Forssen, C., Fynbo, Hou, Geissel, H., Hellstrom, M., Ickert, G., Jones, Kl, Jonson, B., Kliemkiewicz, A., Kratz, Jv, Kulessa, R., Lantz, M., Lebleis, T., Lindahl, Ao, Mahata, K., Matos, M., Meister, M., Munzenberg, G., Nilsson, T., Nyman, G., Palit, R., Pantea, M., Paschalis, S., Prokopowicz, W., Reifarth, R., Richter, A., Riisager, K., Schrieder, G., Simon, H., Summerer, K., Tengblad, O., Walus, W., Weick, H., and Zhukov, Mv

Published
2008

33. Thermonuclear reactionS30(p,γ)Cl31studied via Coulomb breakup ofCl31

Author

Langer, C., primary, Lepyoshkina, O., additional, Aksyutina, Y., additional, Aumann, T., additional, Novo, S. Beceiro, additional, Benlliure, J., additional, Boretzky, K., additional, Chartier, M., additional, Cortina, D., additional, Pramanik, U. Datta, additional, Ershova, O., additional, Geissel, H., additional, Gernhäuser, R., additional, Heil, M., additional, Ickert, G., additional, Johansson, H. T., additional, Jonson, B., additional, Kelić-Heil, A., additional, Klimkiewicz, A., additional, Kratz, J. V., additional, Krücken, R., additional, Kulessa, R., additional, Larsson, K., additional, Le Bleis, T., additional, Lemmon, R., additional, Mahata, K., additional, Marganiec, J., additional, Nilsson, T., additional, Panin, V., additional, Plag, R., additional, Prokopowicz, W., additional, Reifarth, R., additional, Ricciardi, V., additional, Rossi, D. M., additional, Schwertel, S., additional, Simon, H., additional, Sümmerer, K., additional, Streicher, B., additional, Taylor, J., additional, Vignote, J. R., additional, Wamers, F., additional, Wimmer, C., additional, and Wu, P. Z., additional

Published
2014
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34. Study of the $^{15}$O$(2p,\gamma )^{17}$Ne Cross Section by Coulomb Dissociation of $^{17}$Ne for the $rp$ Process of Nucleosynthesis

Author

Marganiec, J., primary, Wamers, F., additional, Aksouh, F., additional, Aksyutina, Y., additional, Alvarez Pol, H., additional, Aumann, T., additional, Beceiro, S., additional, Bertulani, C., additional, Boretzky, K., additional, Borge, M.J.G., additional, Chartier, M., additional, Chatillon, A., additional, Chulkov, L., additional, Cortina-Gil, D., additional, Egorova, I., additional, Emling, H., additional, Ershova, O., additional, Forssén, C., additional, Fraile, L.M., additional, Fynbo, H., additional, Galaviz, D., additional, Geissel, H., additional, Grigorenko, L., additional, Heil, M., additional, Hoffmann, D.H.H., additional, Hoffmann, J., additional, Johansson, H., additional, Jonson, B., additional, Karakoç, M., additional, Karagiannis, C., additional, Kiselev, O., additional, Kratz, J.V., additional, Kulessa, R., additional, Kurz, N., additional, Langer, C., additional, Lantz, M., additional, Larsson, K., additional, Le Bleis, T., additional, Lemmon, R., additional, Litvinov, Yu.A., additional, Mahata, K., additional, Müntz, C., additional, Nilsson, T., additional, Nociforo, C., additional, Nyman, G., additional, Ott, W., additional, Panin, V., additional, Parfenova, Yu., additional, Paschalis, S., additional, Perea, A., additional, Plag, R., additional, Reifarth, R., additional, Richter, A., additional, Riisager, K., additional, Rodríguez Tajes, C., additional, Rossi, D., additional, Schrieder, G., additional, Shulgina, N., additional, Simon, H., additional, Stroth, J., additional, Sümmerer, K., additional, Taylor, J., additional, Tengblad, O., additional, Tengborn, E., additional, Weick, H., additional, Wiescher, M., additional, Wimmer, C., additional, and Zhukov, M., additional

Published
2014
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35. Beyond the neutron drip line: The unbound oxygen isotopes O-25 and O-26

Author

Caesar, C, Simonis, J, Adachi, T, Aksyutina, Y, Alcantara, J, Altstadt, S, Alvarez-Pol, H, Ashwood, N, Aumann, T, Avdeichikov, V, Barr, M, Beceiro, S, Bemmerer, D, Benlliure, J, Bertulani, CA, Boretzky, K, Borge, MJG, Burgunder, G, Caamano, M, Casarejos, E, Catford, W, Cederkaell, J, Chakraborty, S, Chartier, M, Chulkov, L, Cortina-Gil, D, Pramanik, UD, Fernandez, PD, Dillmann, I, Elekes, Z, Enders, J, Ershova, O, Estrade, A, Farinon, F, Fraile, LM, Freer, M, Freudenberger, M, Fynbo, HOU, Galaviz, D, Geissel, H, Gernhaeuser, R, Golubev, P, Gonzalez Diaz, D, Hagdahl, J, Heftrich, T, Heil, M, Heine, M, Heinz, A, Henriques, A, Holl, M, Holt, JD, Ickert, G, Ignatov, A, Jakobsson, B, Johansson, HT, Jonson, B, Kalantar-Nayestanaki, N, Kanungo, R, Kelic-Heil, A, Knoebel, R, Kroell, T, Kruecken, R, Kurcewicz, J, Labiche, M, Langer, C, Le Bleis, T, Lemmon, R, Lepyoshkina, O, Lindberg, S, Machado, J, Marganiec, J, Maroussov, V, Menendez, J, Mostazo, M, Movsesyan, A, Najafi, A, Nilsson, T, Nociforo, C, Panin, V, Perea, A, Pietri, S, Plag, R, Prochazka, A, Rahaman, A, Rastrepina, G, Reifarth, R, Ribeiro, G, Ricciardi, MV, Rigollet, C, Riisager, K, Roeder, M, Rossi, D, del Rio, JS, Savran, D, Scheit, H, Schwenk, A, Simon, H, Sorlin, O, Stoica, V, Streicher, B, Taylor, J, Tengblad, O, Terashima, S, Thies, R, Togano, Y, Uberseder, E, Van de Walle, J, Velho, P, Volkov, V, Wagner, A, Wamers, F, Weick, H, Weigand, M, Wheldon, C, Wilson, G, Wimmer, C, Winfield, JS, Woods, P, Yakorev, D, Zhukov, MV, Zilges, A, Zoric, M, Zuber, K, Caesar, C, Simonis, J, Adachi, T, Aksyutina, Y, Alcantara, J, Altstadt, S, Alvarez-Pol, H, Ashwood, N, Aumann, T, Avdeichikov, V, Barr, M, Beceiro, S, Bemmerer, D, Benlliure, J, Bertulani, CA, Boretzky, K, Borge, MJG, Burgunder, G, Caamano, M, Casarejos, E, Catford, W, Cederkaell, J, Chakraborty, S, Chartier, M, Chulkov, L, Cortina-Gil, D, Pramanik, UD, Fernandez, PD, Dillmann, I, Elekes, Z, Enders, J, Ershova, O, Estrade, A, Farinon, F, Fraile, LM, Freer, M, Freudenberger, M, Fynbo, HOU, Galaviz, D, Geissel, H, Gernhaeuser, R, Golubev, P, Gonzalez Diaz, D, Hagdahl, J, Heftrich, T, Heil, M, Heine, M, Heinz, A, Henriques, A, Holl, M, Holt, JD, Ickert, G, Ignatov, A, Jakobsson, B, Johansson, HT, Jonson, B, Kalantar-Nayestanaki, N, Kanungo, R, Kelic-Heil, A, Knoebel, R, Kroell, T, Kruecken, R, Kurcewicz, J, Labiche, M, Langer, C, Le Bleis, T, Lemmon, R, Lepyoshkina, O, Lindberg, S, Machado, J, Marganiec, J, Maroussov, V, Menendez, J, Mostazo, M, Movsesyan, A, Najafi, A, Nilsson, T, Nociforo, C, Panin, V, Perea, A, Pietri, S, Plag, R, Prochazka, A, Rahaman, A, Rastrepina, G, Reifarth, R, Ribeiro, G, Ricciardi, MV, Rigollet, C, Riisager, K, Roeder, M, Rossi, D, del Rio, JS, Savran, D, Scheit, H, Schwenk, A, Simon, H, Sorlin, O, Stoica, V, Streicher, B, Taylor, J, Tengblad, O, Terashima, S, Thies, R, Togano, Y, Uberseder, E, Van de Walle, J, Velho, P, Volkov, V, Wagner, A, Wamers, F, Weick, H, Weigand, M, Wheldon, C, Wilson, G, Wimmer, C, Winfield, JS, Woods, P, Yakorev, D, Zhukov, MV, Zilges, A, Zoric, M, and Zuber, K

Published
2013

36. Momentum profile analysis in one-neutron knockout from Borromean nuclei

Author

SCOAP, Aksyutina, Y., Aumann, T., Boretzky, K., García Borge, María José, Caesar, C., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Datta Pramanik, U., Emling, H., Fynbo, H.O.U., Geissel, H., Ickert, G., Johansson, H.T., Jonson, B., Kulessa, R., Langer, C., LeBleis, T., Mahata, K., Münzenberg, G., Nilsson, T., Nyman, G., Palit, R., Paschalis, S., Prokopowicz, W., Reifarth, R., Rossi, D., Richter, A., Riisager, K., Schrieder, G., Simon, H., Sümmerer, K., Tengblad, Olof, Weick, H., Zhukov, M. V., SCOAP, Aksyutina, Y., Aumann, T., Boretzky, K., García Borge, María José, Caesar, C., Chatillon, A., Chulkov, L. V., Cortina-Gil, D., Datta Pramanik, U., Emling, H., Fynbo, H.O.U., Geissel, H., Ickert, G., Johansson, H.T., Jonson, B., Kulessa, R., Langer, C., LeBleis, T., Mahata, K., Münzenberg, G., Nilsson, T., Nyman, G., Palit, R., Paschalis, S., Prokopowicz, W., Reifarth, R., Rossi, D., Richter, A., Riisager, K., Schrieder, G., Simon, H., Sümmerer, K., Tengblad, Olof, Weick, H., and Zhukov, M. V.

Abstract

One-neutron knockout reactions from Borromean nuclei are analyzed using a profile function analysis technique. The profile function, which is derived as the square root of the variance of the measured fragment + neutron momenta as a function of their relative energy, is shown to be very sensitive to the angular momentum of the knocked out neutron. Three cases are studied here: 7He, where the profile function analysis shows a presence of (s1/2)2 component in the 8He ground-state wave-function, 10Li, where the presence of a 11(2)% d-wave contribution to the relative energy spectrum above 1.5 MeV is found and, finally, the presence of a major s contribution around 0.5 MeV relative energy in the 13Be case and that the observed decay to the 12Be 2+ state originates in a d state in 13Be. © 2012 Elsevier Open access under CC BY license.

Published
2013

37. Direct reactions of light exotic beams measured in complete kinematics at R3B

Author

Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Boretzky, K., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Datta Pramanik, U., Diaz, P., Dillmann, I., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Galaviz Redondo, D., Geissel, H., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Henriques, A., Holl, M., Ignatov, A., Johansson, H., Jonson, B., Kalantar, N., Knöbel, R., Kroell, T., Krücken, R., Kurcewicz, J., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Machado, J., Marganiec, J., Movsesyan, A., Najafi, A., Nilsson, T., Nociforo, C., Panin, V., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez Del Rio, J., Savran, D., Scheit, H., Simon, H., Sorlin, O., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Yasuhiro, T., Uberseder, E., Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J., Woods, P., Yakorev, D., Zoric, M., Zuber, K., Adachi, T., Aksyutina, Y., Alcantara, J., Altstadt, S., Alvarez-Pol, H., Ashwood, N., Aumann, T., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Boretzky, K., Burgunder, G., Caamano, M., Caesar, C., Casarejos, E., Catford, W., Chakraborty, S., Chartier, M., Chulkov, L., Cortina-Gil, D., Datta Pramanik, U., Diaz, P., Dillmann, I., Enders, J., Ershova, O., Estrade, A., Farinon, F., Fraile, L. M., Freer, M., Freudenberger, M., Galaviz Redondo, D., Geissel, H., Gonzalez Diaz, D., Hagdahl, J., Heftrich, T., Heil, M., Heine, M., Henriques, A., Holl, M., Ignatov, A., Johansson, H., Jonson, B., Kalantar, N., Knöbel, R., Kroell, T., Krücken, R., Kurcewicz, J., Labiche, M., Langer, C., Le Bleis, T., Lemmon, R., Machado, J., Marganiec, J., Movsesyan, A., Najafi, A., Nilsson, T., Nociforo, C., Panin, V., Pietri, S., Plag, R., Prochazka, A., Rahaman, A., Rastrepina, G., Reifarth, R., Ribeiro, G., Ricciardi, M. V., Rigollet, C., Riisager, K., Röder, M., Rossi, D., Sanchez Del Rio, J., Savran, D., Scheit, H., Simon, H., Sorlin, O., Streicher, B., Taylor, J., Tengblad, O., Terashima, S., Thies, R., Yasuhiro, T., Uberseder, E., Walle, J., Velho, P., Volkov, V., Wagner, A., Wamers, F., Weick, H., Weigand, M., Wheldon, C., Wilson, G., Wimmer, C., Winfield, J., Woods, P., Yakorev, D., Zoric, M., and Zuber, K.

Abstract

An experiment has been performed by the R3B collaboration aiming at the investigation of light neutron-rich nuclei utilizing kinematically complete measurements of reactions at relativistic energies with the R3 B-LAND reaction setup at Cave C. The physics topics to be studied comprise the measurement of astrophysical reaction rates relevant for r-process nucleosynthesis using heavy-ion induced electromagnetic excitation and quasi-free knockout reactions to study the evolution of shell and cluster structures close to and beyond the dripline.

Published
2011

38. Beyond the neutron drip line: The unbound oxygen isotopes25O and26O

Author

Caesar, C., primary, Simonis, J., additional, Adachi, T., additional, Aksyutina, Y., additional, Alcantara, J., additional, Altstadt, S., additional, Alvarez-Pol, H., additional, Ashwood, N., additional, Aumann, T., additional, Avdeichikov, V., additional, Barr, M., additional, Beceiro, S., additional, Bemmerer, D., additional, Benlliure, J., additional, Bertulani, C. A., additional, Boretzky, K., additional, Borge, M. J. G., additional, Burgunder, G., additional, Caamano, M., additional, Casarejos, E., additional, Catford, W., additional, Cederkäll, J., additional, Chakraborty, S., additional, Chartier, M., additional, Chulkov, L., additional, Cortina-Gil, D., additional, Datta Pramanik, U., additional, Diaz Fernandez, P., additional, Dillmann, I., additional, Elekes, Z., additional, Enders, J., additional, Ershova, O., additional, Estrade, A., additional, Farinon, F., additional, Fraile, L. M., additional, Freer, M., additional, Freudenberger, M., additional, Fynbo, H. O. U., additional, Galaviz, D., additional, Geissel, H., additional, Gernhäuser, R., additional, Golubev, P., additional, Gonzalez Diaz, D., additional, Hagdahl, J., additional, Heftrich, T., additional, Heil, M., additional, Heine, M., additional, Heinz, A., additional, Henriques, A., additional, Holl, M., additional, Holt, J. D., additional, Ickert, G., additional, Ignatov, A., additional, Jakobsson, B., additional, Johansson, H. T., additional, Jonson, B., additional, Kalantar-Nayestanaki, N., additional, Kanungo, R., additional, Kelic-Heil, A., additional, Knöbel, R., additional, Kröll, T., additional, Krücken, R., additional, Kurcewicz, J., additional, Labiche, M., additional, Langer, C., additional, Le Bleis, T., additional, Lemmon, R., additional, Lepyoshkina, O., additional, Lindberg, S., additional, Machado, J., additional, Marganiec, J., additional, Maroussov, V., additional, Menéndez, J., additional, Mostazo, M., additional, Movsesyan, A., additional, Najafi, A., additional, Nilsson, T., additional, Nociforo, C., additional, Panin, V., additional, Perea, A., additional, Pietri, S., additional, Plag, R., additional, Prochazka, A., additional, Rahaman, A., additional, Rastrepina, G., additional, Reifarth, R., additional, Ribeiro, G., additional, Ricciardi, M. V., additional, Rigollet, C., additional, Riisager, K., additional, Röder, M., additional, Rossi, D., additional, Sanchez del Rio, J., additional, Savran, D., additional, Scheit, H., additional, Schwenk, A., additional, Simon, H., additional, Sorlin, O., additional, Stoica, V., additional, Streicher, B., additional, Taylor, J., additional, Tengblad, O., additional, Terashima, S., additional, Thies, R., additional, Togano, Y., additional, Uberseder, E., additional, Van de Walle, J., additional, Velho, P., additional, Volkov, V., additional, Wagner, A., additional, Wamers, F., additional, Weick, H., additional, Weigand, M., additional, Wheldon, C., additional, Wilson, G., additional, Wimmer, C., additional, Winfield, J. S., additional, Woods, P., additional, Yakorev, D., additional, Zhukov, M. V., additional, Zilges, A., additional, Zoric, M., additional, and Zuber, K., additional

Published
2013
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39. STUDY OF THE 15O(2p, γ) 17 Ne CROSS SECTION BY COULOMB DISSOCIATION OF 15Ne FOR THE rp PROCESS OF NUCLEOSYNTHESIS.

Author

MARGANIEC, J., WAMERS, F., AKSOUH, F., AKSYUTINA, Y., POL, H. ALVAREZ, AUMANN, T., BECEIRO, S., BERTULANI, C., BORETZKY, K., BORGE, M. J. G., CHARTIER, M., CHATILLON, A., CHULKOV, L., CORTINA-GIL, D., EGOROVA, I., EMLING, H., ERSHOVA, O., FORSSÉN, C., FRAILE, L. M., and FYNBO, H.

Subjects
COULOMB excitation, OXYGEN isotopes, NEON isotopes, NUCLEAR cross sections, NUCLEOSYNTHESIS, NUCLEAR energy, RADIOACTIVE decay
Abstract

The 15O(2p, γ) 17Ne cross section has been studied by the inverse reaction, the Coulomb dissociation of 17Ne. The experiment has been performed at the GSI. The 17Ne excitation energy prior to decay has been reconstructed by using the invariant-mass method. The preliminary differential and integral Coulomb dissociation cross sections (σCoul) have been extracted, which provide a photoabsorption (σphoto) and a radiative capture cross section (σcap). Additionally, important information about the 17Ne nuclear structure will be obtained. The analysis is in progress. [ABSTRACT FROM AUTHOR]

Published
2014
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40. Coulomb breakup of17Ne from the viewpoint of nuclear astrophysics

Author

Marganiec, J., Aksouh, F., Aksyutina, Y., Alvarez Pol, H., Aumann, T., Beceiro, S., Bertulani, C., Boretzky, K., Borge, M. J., Chartier, M., Chatillon, A., Chulkov, L., Cortina-Gil, D., Egorova, I., Emling, H., Ershova, O., Christian Forssén, Fraile, L. M., Fynbo, H., Galaviz, D., Geissel, H., Grigorenko, L., Heil, M., Hoffmann, D. H. H., Hoffmann, J., Johansson, H., Jonson, B., Karagiannis, C., Kiselev, O., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Larsson, K., Le Bleis, T., Lemmon, R., Lindahl, A., Litvinov, Yu A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Parfenova, Yu, Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Rodríguez Tajes, C., Rossi, D., Schrieder, G., Shulgina, N., Simon, H., Stroth, J., Sümmerer, K., Taylor, J., Tengblad, O., Tengborn, E., Wamers, F., Weick, H., Wimmer, C., and Zhukov, M.

41. Coulomb breakup of 17Ne from the viewpoint of nuclear astrophysics

Author

Marganiec, J., Aksouh, F., Aksyutina, Y., Alvarez Pol, H., Aumann, T., Beceiro, S., Bertulani, C., Boretzky, K., Borge, M. J., Chartier, M., Chatillon, A., Chulkov, L., Dolores Cortina Gil, Egorova, I., Emling, H., Ershova, O., Forssén, C., Fraile, L. M., Fynbo, H., Galaviz, D., Geissel, H., Grigorenko, L., Heil, M., Hoffmann, D. H. H., Hoffmann, J., Johansson, H., Jonson, B., Karagiannis, C., Kiselev, O., Kratz, J. V., Kulessa, R., Kurz, N., Langer, C., Lantz, M., Larsson, K., Le Bleis, T., Lemmon, R., Lindahl, A., Litvinov, Yu A., Mahata, K., Müntz, C., Nilsson, T., Nociforo, C., Nyman, G., Ott, W., Panin, V., Parfenova, Yu, Paschalis, S., Perea, A., Plag, R., Reifarth, R., Richter, A., Rodríguez Tajes, C., Rossi, D., Schrieder, G., Shulgina, N., Simon, H., Stroth, J., Sümmerer, K., Taylor, J., Tengblad, O., Tengborn, E., Wamers, F., Weick, H., Wimmer, C., and Zhukov, M.

Abstract

By the Coulomb breakup of 17Ne, the time-reversed reaction 15O(2p,γ)17Ne has been studied. This reaction might play an important role in the rp process, as a break-out reaction of the hot CNO cycle. The secondary 17Ne ion beam with an energy of 500 MeV/nucleon has been dissociated in a Pb target. The reaction products have been detected with the LAND-R3B experimental setup at GSI. The preliminary differential and integral Coulomb dissociation cross section sCoul has been determined, which then will be converted into a photo-absorption cross section sphot o, and a two-proton radiative capture cross section σcap. Additionally, information about the structure of the 17Ne, a potential two-proton halo nucleus, will be received. The analysis is in progress.

42. 13,14B(n, γ) via Coulomb Dissociation for Nucleosynthesis towards the r-Process.

Author

Altstadt, S. G., Adachi, T., Aksyutina, Y., Alcantara, J., Alvarez-Pol, H., Ashwood, N., Atar, L., Aumann, T., Avdeichikov, V., Barr, M., Beceiro, S., Bemmerer, D., Benlliure, J., Bertulani, C. A., Boretzky, K., Borge, M. J. G., Burgunder, G., Caamano, M., Caesar, C., and Casarejos, E.

Subjects
*BORON isotopes, *NUCLEOSYNTHESIS, *RADIOACTIVE nuclear beams, *ARGON isotopes, *NUCLEAR physics experiments, *NUCLEAR cross sections
Abstract

Radioactive beams of 14,15B produced by fragmentation of a primary 40Ar beam were directed onto a Pb target to investigate the neutron breakup within the Coulomb field. The experiment was performed at the LAND/R³B setup. Preliminary results for the Coulomb dissociation cross sections as well as for the astrophysically interesting inverse reactions, 13,14B(n,γ), are presented. [ABSTRACT FROM AUTHOR]

Published
2014
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43. Thermonuclear reaction 30S(p,y)31CI studied via Coulomb breakup of 31CI.

Author

Langer, C., Lepyoshkina, O., Aksyutina, Y., Aumann, T., Novo, S. Beeeiro, Benlliure, J., Boretzky, K., Chartier, M., Cortina, D., Pramanik, U. Datta, Ershova, O., Geissei, H., Gernhäuser, R., Heil, M., Ickert, G., Johansson, H. T., Jonson, B., Kelić-Heil, A., Klimkiewicz, A., and Kratz, J. V.

Subjects
*KINEMATICS, *PROTONS, *NUCLEOSYNTHESIS, *COULOMB functions, *EXCITATION spectrum
Abstract

Coulomb breakup at high energy in inverse kinematics of proton-rich 3'CI was used to constrain the thermonuclear 30S(p,y)3lCI capture reaction rate under typical Type I x-ray burst conditions. This reaction is a bottleneck during rapid proton-capture nucleosynthesis (rp process), where its rate depends predominantly on the nuclear structure of 31CI. Two low-lying states just above the proton-separation threshold of Sp = 296(50) keV in 3IC1 have been identified experimentally using the R³B-LAND setup at the GSI Helmholtzzentrum für Schwerionenforschung GmbH. Both states are considered to play a key role in the thermonuclear 30S(p,)/)31Cl capture reaction. Excitation energies of the first Jπ = 1 /2+,5/2+ states have been extracted and the reaction rate for proton capture on 30S under typical rp-process temperatures has been investigated. [ABSTRACT FROM AUTHOR]

Published
2014
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44. First observation of the unbound nucleus 15Ne.

Author

Wamers F, Marganiec J, Aksouh F, Aksyutina Y, Álvarez-Pol H, Aumann T, Beceiro-Novo S, Boretzky K, Borge MJ, Chartier M, Chatillon A, Chulkov LV, Cortina-Gil D, Emling H, Ershova O, Fraile LM, Fynbo HO, Galaviz D, Geissel H, Heil M, Hoffmann DH, Johansson HT, Jonson B, Karagiannis C, Kiselev OA, Kratz JV, Kulessa R, Kurz N, Langer C, Lantz M, Le Bleis T, Lemmon R, Litvinov YA, Mahata K, Müntz C, Nilsson T, Nociforo C, Nyman G, Ott W, Panin V, Paschalis S, Perea A, Plag R, Reifarth R, Richter A, Rodriguez-Tajes C, Rossi D, Riisager K, Savran D, Schrieder G, Simon H, Stroth J, Sümmerer K, Tengblad O, Weick H, Wimmer C, and Zhukov MV

Abstract

We report on the first observation of the unbound proton-rich nucleus 15Ne. Its ground state and first excited state were populated in two-neutron knockout reactions from a beam of 500 MeV/u 17Ne. The 15Ne ground state is found to be unbound by 2.522(66) MeV. The decay proceeds directly to 13O with simultaneous two-proton emission. No evidence for sequential decay via the energetically allowed 2- and 1- states in 14F is observed. The 15Ne ground state is shown to have a strong configuration with two protons in the (sd) shell around 13O with a 63(5)% (1s1/2)2 component.

Published
2014
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45. Study of the 14Be continuum: identification and structure of its second 2+ state.

Author

Aksyutina Y, Aumann T, Boretzky K, Borge MJ, Caesar C, Chatillon A, Chulkov LV, Cortina-Gil D, Datta Pramanik U, Emling H, Fynbo HO, Geissel H, Heinz A, Ickert G, Johansson HT, Jonson B, Kulessa R, Langer C, LeBleis T, Mahata K, Münzenberg G, Nilsson T, Nyman G, Palit R, Paschalis S, Prokopowicz W, Reifarth R, Rossi D, Richter A, Riisager K, Schrieder G, Simon H, Sümmerer K, Tengblad O, Thies R, Weick H, and Zhukov MV

Abstract

The coupling between bound quantum states and those in the continuum is of high theoretical interest. Experimental studies of bound drip-line nuclei provide ideal testing grounds for such investigations since they, due to the feeble binding energy of their valence particles, are easy to excite into the continuum. In this Letter, continuum states in the heaviest particle-stable Be isotope, 14Be, are studied by employing the method of inelastic proton scattering in inverse kinematics. New continuum states are found at excitation energies E*=3.54(16)  MeV and E*=5.25(19)  MeV. The structure of the earlier known 2(1)+ state at 1.54(13) MeV was confirmed with a predominantly (0d5/2)2 configuration while there is very clear evidence that the 2(2)+ state has a predominant (1s1/2, 0d5/2) structure with a preferential three-body decay mechanism. The region at about 7 MeV excitation shows distinct features of sequential neutron decay via intermediate states in 13Be. This demonstrates that the increasing availability of energetic beams of exotic nuclei opens up new vistas for experiments leading towards a new understanding of the interplay between bound and continuum states.

Published
2013
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