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Journal articles
Structure of $^{13}$Be probed via secondary beam reactions
G. Randisi
1
A. Leprince
1
H. Al Falou
1
N.A. Orr
1
F.M. Marqués
1
N.L. Achouri
1
J.C. Angélique
1
N. Ashwood
B. Bastin
1, 2
T. Bloxham
B. A. Brown
W. N. Catford
N. Curtis
F. Delaunay
1
M. Freer
E. de Góes Brennand
P. Haigh
F. Hanappe
C. Harlin
B. Laurent
1
J.L. Lecouey
1
A. Ninane
N. Patterson
D. Price
L. Stuttgé
3
J. S. Thomas
G. Randisi 1
Author
A. Leprince 1
Author
H. Al Falou 1
Author
N.A. Orr 1
Mail : Site :
Author Employer institution : Institut National de Physique Nucléaire et de Physique des Particules du CNRS
F.M. Marqués 1
Mail : Site :
Author Employer institution : Institut National de Physique Nucléaire et de Physique des Particules du CNRS
N.L. Achouri 1
Mail : Site :
Author Employer institution : Institut National de Physique Nucléaire et de Physique des Particules du CNRS
J.C. Angélique 1
Mail : Site :
Author Employer institution : École Nationale Supérieure d'Ingénieurs de Caen
N. Ashwood
Author
N. Curtis
Author
F. Delaunay 1
Mail : Site :
Author Employer institution : Université de Caen Normandie
M. Freer
Author
E. de Góes Brennand
Author
J.L. Lecouey 1
Mail : Site :
Author Employer institution : École Nationale Supérieure d'Ingénieurs de Caen
A. Ninane
Author
N. Patterson
Author
D. Price
Author
L. Stuttgé 3
Author
J. S. Thomas
Author
1
LPCC - Laboratoire de physique corpusculaire de Caen (ENSICAEN - 6, boulevard du Marechal Juin 14050 Caen Cedex - France)
- UNICAEN - Université de Caen Normandie (Esplanade de la Paix - CS 14032 - 14032 CAEN Cedex 5 - France)
- NU - Normandie Université (Esplanade de la Paix - CS 14032 - 14032 Caen Cedex 5 - France)
- ENSICAEN - École Nationale Supérieure d'Ingénieurs de Caen (6, Boulevard du Maréchal Juin CS 45053 14050 CAEN cedex 04 - France)
- NU - Normandie Université (Esplanade de la Paix - CS 14032 - 14032 Caen Cedex 5 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR6534 (France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
2
GANIL - Grand Accélérateur National d'Ions Lourds (Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5 - France)
- CEA - Commissariat à l'énergie atomique et aux énergies alternatives : DRF/GANIL (Centre de Saclay Centre de Grenoble Centre de Cadarache etc - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- CNRS - Centre National de la Recherche Scientifique : UPR3266 (France)
3
IPHC - Institut Pluridisciplinaire Hubert Curien (23 rue Loess - BP 28 67037 Strasbourg Cedex - France)
- CNRS - Centre National de la Recherche Scientifique : UMR7178 (France)
- UNISTRA - Université de Strasbourg (4 rue Blaise Pascal - CS 90032 - 67081 Strasbourg cedex - France)
Abstract : The low-lying level structure of the unbound neutron-rich nucleus $^{13}$Be has been investigated via breakup on a carbon target of secondary beams of $^{14,15}$B at 35 MeV/nucleon. The coincident detection of the beam velocity $^{12}$Be fragments and neutrons permitted the invariant mass of the $^{12}$Be+$n$ and $^{12}$Be+$n$+$n$ systems to be reconstructed. In the case of the breakup of $^{15}$B, a very narrow structure at threshold was observed in the $^{12}$Be+$n$ channel. Contrary to earlier stable beam fragmentation studies which identified this as a strongly interacting $s$-wave virtual state in $^{13}$Be, analysis here of the $^{12}$Be+$n$+$n$ events demonstrated that this was an artifact resulting from the sequential-decay of the $^{14}$Be(2$^+$) state. Single-proton removal from $^{14}$B was found to populate a broad low-lying structure some 0.70 MeV above the neutron-decay threshold in addition to a less prominent feature at around 2.4 MeV. Based on the selectivity of the reaction and a comparison with (0-3)$\hbar\omega$ shell-model calculations, the low-lying structure is concluded to most probably arise from closely spaced J$^\pi$=1/2$^+$ and 5/2$^+$ resonances (E$_r$=0.40$\pm$0.03 and 0.85$^{+0.15}_{-0.11}$ MeV), whilst the broad higher-lying feature is a second 5/2$^+$ level (E$_r$=2.35$\pm$0.14 MeV). Taken in conjunction with earlier studies, it would appear that the lowest 1/2$^+$ and 1/2$^-$ levels lie relatively close together below 1 MeV.
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http://hal.in2p3.fr/in2p3-00920222
Contributor : Michel Lion <>
Submitted on : Wednesday, December 18, 2013 - 9:11:47 AM
Last modification on : Tuesday, May 14, 2019 - 10:29:10 AM
Contributor : Michel Lion <>
Submitted on : Wednesday, December 18, 2013 - 9:11:47 AM
Last modification on : Tuesday, May 14, 2019 - 10:29:10 AM
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- HAL Id : in2p3-00920222, version 1
- ARXIV : 1312.2360
- DOI : 10.1103/PhysRevC.89.034320
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Citation
G. Randisi, A. Leprince, H. Al Falou, N.A. Orr, F.M. Marqués, et al.. Structure of $^{13}$Be probed via secondary beam reactions. Physical Review C, American Physical Society, 2014, 89, pp.034320. ⟨10.1103/PhysRevC.89.034320⟩. ⟨in2p3-00920222⟩
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