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Structure of Be 13 studied in proton knockout from B 14

, ; Ribeiro, G.; Avdeichikov, Vladimir LU ; Cederkäll, Joakim LU ; Golubev, Pavel LU and Zuber, K. (2018) In Physical Review C 98(2).
Abstract
The neutron-unbound isotope Be13 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 Be13 structure, is a challenge, particularly in light of its bridging role between Be12, where the N=8 neutron shell breaks down, and the Borromean halo nucleus Be14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be12 after proton knockout from B14, by measuring coincidences between Be12, neutrons, and γ rays... (More)
The neutron-unbound isotope Be13 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 Be13 structure, is a challenge, particularly in light of its bridging role between Be12, where the N=8 neutron shell breaks down, and the Borromean halo nucleus Be14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be12 after proton knockout from B14, by measuring coincidences between Be12, neutrons, and γ rays originating from de-excitation of states fed by neutron decay of Be13. The Be13 isotopes were produced in proton knockout from a 400 MeV/nucleon B14 beam impinging on a CH2 target. The Be12-n relative-energy spectrum dσ/dEfn was obtained from coincidences between Be12(g.s.) and a neutron, and also as threefold coincidences by adding γ rays, from the de-excitation of excited states in Be12. Neutron decay from the first 5/2+ state in Be13 to the 2+ state in Be12 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 B14 beam. A low-lying p-wave resonance in Be13(1/2-) is confirmed by comparing proton- and neutron-knockout data from B14 and Be14. © 2018 authors. Published by the American Physical Society. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
98
issue
2
publisher
American Physical Society
external identifiers
  • scopus:85051442870
ISSN
2469-9985
DOI
10.1103/PhysRevC.98.024603
language
English
LU publication?
yes
id
51742a55-669b-4368-af64-9315e64e81f1
date added to LUP
2018-09-10 13:53:36
date last changed
2018-10-03 12:14:11
@article{51742a55-669b-4368-af64-9315e64e81f1,
  abstract     = {The neutron-unbound isotope Be13 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 Be13 structure, is a challenge, particularly in light of its bridging role between Be12, where the N=8 neutron shell breaks down, and the Borromean halo nucleus Be14. The purpose of the present study is to investigate the role of bound excited states in the reaction product Be12 after proton knockout from B14, by measuring coincidences between Be12, neutrons, and γ rays originating from de-excitation of states fed by neutron decay of Be13. The Be13 isotopes were produced in proton knockout from a 400 MeV/nucleon B14 beam impinging on a CH2 target. The Be12-n relative-energy spectrum dσ/dEfn was obtained from coincidences between Be12(g.s.) and a neutron, and also as threefold coincidences by adding γ rays, from the de-excitation of excited states in Be12. Neutron decay from the first 5/2+ state in Be13 to the 2+ state in Be12 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 B14 beam. A low-lying p-wave resonance in Be13(1/2-) is confirmed by comparing proton- and neutron-knockout data from B14 and Be14. © 2018 authors. Published by the American Physical Society.},
  author       = {,  and Ribeiro, G. and Avdeichikov, Vladimir and Cederkäll, Joakim and Golubev, Pavel and Zuber, K.},
  issn         = {2469-9985},
  language     = {eng},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review C},
  title        = {Structure of Be 13 studied in proton knockout from B 14},
  url          = {http://dx.doi.org/10.1103/PhysRevC.98.024603},
  volume       = {98},
  year         = {2018},
}