Title: Experimental evidence for subshell closure in He-8 and indication of a resonant state in He-7 below 1 MeV
Authors: Skaza, F
Lapoux, V
Keeley, N
Alamanos, N
Pollacco, EC
Auger, F
Drouart, A
Gillibert, A
Beaumel, D
Becheva, E
Blumenfeld, Y
Delaunay, F
Giot, L
Kemper, KW
Nalpas, L
Obertelli, A
Pakou, A
Raabe, Riccardo
Roussel-Chomaz, P
Sida, JL
Scarpaci, JA
Stepantsov, S
Wolski, R
Issue Date: Apr-2006
Publisher: American physical soc
Series Title: Physical Review C vol:73 issue:4 pages:-
Abstract: The spectroscopy of the unstable He-8 and unbound He-7 nuclei is investigated via the p(He-8, d) transfer reaction with a 15.7A MeV He-8 beam from the SPIRAL facility. The emitted deuterons were detected by the telescope array MUST. The results are analyzed within the coupled-channels Born approximation framework, and a spectroscopic factor (CS)-S-2=4.4 +/- 1.3 for neutron pickup to the He-7(g.s.) is deduced. This value is consistent with a full p3/2 subshell for He-8. Tentative evidence for the first excited state of He-7 is found at E-*=0.9 +/- 0.5 MeV (width Gamma=1.0 +/- 0.9 MeV). The second one is observed at a position compatible with previous measurements, E-*=2.9 +/- 0.1 MeV. Both are in agreement with previous separate measurements. The reproduction of the first excited state below 1 MeV would be a challenge for the most sophisticated nuclear theories.
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications

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