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Title: Structure of Be 13 studied in proton knockout from B 14

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, particularly 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 γ 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/nucleon 14B beam impinging on a CH 2 target. The 12Be–n relative-energy spectrum dσ/dE fn was obtained from coincidences between 12Be (g.s.) and a neutron, and also as threefold coincidences by adding γ 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 2.11more » MeV is confirmed. Furthermore, an energy independence of the proton-knockout mechanism is found from a comparison with data taken with a 35 MeV/nucleon 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 .« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; R3B Collaboration"" class="biblio-detail-author-link"> « less
Publication Date:
Research Org.:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
[R3B Collaboration]
OSTI Identifier:
1462783
Alternate Identifier(s):
OSTI ID: 1501437
Grant/Contract Number:  
[FG02-08ER41533]
Resource Type:
Published Article
Journal Name:
Physical Review C
Additional Journal Information:
[Journal Name: Physical Review C Journal Volume: 98 Journal Issue: 2]; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

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., and R3B Collaboration. Structure of Be 13 studied in proton knockout from B 14. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.98.024603.
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., & R3B Collaboration. Structure of Be 13 studied in proton knockout from B 14. United States. doi:10.1103/PhysRevC.98.024603.
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., and R3B Collaboration. Fri . "Structure of Be 13 studied in proton knockout from B 14". United States. doi:10.1103/PhysRevC.98.024603.
@article{osti_1462783,
title = {Structure of Be 13 studied in proton knockout from B 14},
author = {Ribeiro, G. and Nácher, E. and Tengblad, O. and Díaz Fernández, P. and Aksyutina, Y. and Alvarez-Pol, H. and Atar, L. and Aumann, T. and Avdeichikov, V. and Beceiro-Novo, S. and Bemmerer, D. and Benlliure, J. and Bertulani, C. A. and Boillos, J. M. and Boretzky, K. and Borge, M. J. G. and Caamano, M. and Caesar, C. and Casarejos, E. and Catford, W. and Cederkäll, J. and Chartier, M. and Chulkov, L. and Cortina-Gil, D. and Cravo, E. and Crespo, R. and Datta Pramanik, U. and Dillmann, I. and Elekes, Z. and Enders, J. and Ershova, O. and Estrade, A. and Farinon, F. and Fraile, L. M. and Freer, M. and Fynbo, H. O. U. and Galaviz, D. and Geissel, H. and Gernhäuser, R. and Golubev, P. and Göbel, K. and Hagdahl, J. and Heftrich, T. and Heil, M. and Heine, M. and Heinz, A. and Henriques, A. and Holl, M. and Hufnagel, A. and Ignatov, A. and Johansson, H. T. and Jonson, B. and Kalantar-Nayestanaki, N. and Kanungo, R. and Kelic-Heil, A. and Kurz, N. and Kröll, T. and Labiche, M. and Langer, C. and Le Bleis, T. and Lemmon, R. and Lindberg, S. and Machado, J. and Marganiec, J. and Movsesyan, A. and Nilsson, T. and Nociforo, C. and Panin, V. and Paschalis, S. and Perea, A. and Petri, M. and Pietri, S. and Plag, R. and Reifarth, R. and Rigollet, C. and Riisager, K. and Rossi, D. and Röder, M. and Savran, D. and Scheit, H. and Simon, H. and Sorlin, O. and Syndikus, I. and Taylor, J. T. and Thies, R. and Velho, P. and Wagner, A. and Wamers, F. and Vandebrouck, M. and Weick, H. and Wheldon, C. and Wilson, G. and Wimmer, C. and Winfield, J. S. and Woods, P. and Zhukov, M. V. and Zilges, A. and Zuber, K. and R3B Collaboration},
abstractNote = {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, particularly 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 γ 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/nucleon 14B beam impinging on a CH2 target. The 12Be–n relative-energy spectrum dσ/dEfn was obtained from coincidences between 12Be (g.s.) and a neutron, and also as threefold coincidences by adding γ 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 confirmed. Furthermore, an energy independence of the proton-knockout mechanism is found from a comparison with data taken with a 35 MeV/nucleon 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 .},
doi = {10.1103/PhysRevC.98.024603},
journal = {Physical Review C},
number = [2],
volume = [98],
place = {United States},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1103/PhysRevC.98.024603

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Figures / Tables:

FIG. 1. FIG. 1. : Schematic view of the experimental setup. The square shaped plastic scintillator (POS) is used as the start signal of the time of-flight measurements and gives also information about the energy loss of the beam particles. The position sensitive silicon pin diode (PSP) detectors are used for trackingmore » of the beam position and for determining the charge of the isotopes from their energy loss. The ROLU is a set of scintillators, which allows one to restrict the active beam size. Any particle that does not pass through the hole defined by the position of the four scintillators gives a signal, which is used as a veto trigger for the data acquisition system. Double-sided silicon strip detectors (DSSDs) in front of and behind the reaction target are used for separating the charge and tracking of the emerging fragments. The two fiber detectors (GFIs) are used for tracking the fragment trajectories. A set of scintillators, the time-of-flight wall (TFW), is used to provide a stop signal for the time-of-flight measurement and as an energy loss detector. The LAND neutron detector and the Crystal Ball, surrounding the target, are discussed in the text. Figure from Ref. [43].« less

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