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New excited states in the halo nucleus 6He
Mougeot X., Lapoux V., Mittig W., Alamanos N., Auger F. et al
Physics Letters B 718 (2012) 441-446 - http://hal.in2p3.fr/in2p3-00756596
Physique/Physique Nucléaire Expérimentale
New excited states in the halo nucleus 6He
X. Mougeot1, V. Lapoux1, W. Mittig2, N. Alamanos1, F. Auger1, B. Avez1, D. Beaumel3, Y. Blumenfeld3, R. Dayras1, A. Drouart1, C. Force2, L. Gaudefroy4, A. Gillibert1, J. Guillot3, H. Iwasaki1, T. Al Kalanee2, N. Keeley, L. Nalpas1, E.C. Pollacco1, T. Roger2, P. Roussel-Chomaz2, D. Suzuki, K.W. Kemper, T.J. Mertzimekis, A. Pakou, K. Rusek, J.-A. Scarpaci3, C. Simenel1, I. Strojek, R. Wolski
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
CEA : DSM/IRFU
France
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
http://www.ganil-spiral2.eu
CNRS : UPR3266 – IN2P3 – CEA : DSM/GANIL
Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5
France
3 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
4 :  DAM/DIF - DAM Île-de-France
http://www-dam.cea.fr/
CEA : DAM/DIF
CEA Bruyères-le-Châtel 91297 Arpajon cedex
France
The low-lying spectroscopy of 6He was investigated via the 2-neutron transfer reaction p(8He, t) with the 8He beam delivered by the SPIRAL facility at 15.4 A MeV. The light charged particles produced by the direct reactions were measured using the MUST2 Si-strip telescope array. Above the known 2+ state, two new resonances were observed: at E∗ = 2.6±0.3 MeV (width Γ = 1.6±0.4 MeV) and at 5.3±0.3 MeV with Γ = 2 ± 1 MeV. Through the analysis of the angular distributions, they correspond to a 2+ state and to an L = 1 state, respectively. These new states, challenging the nuclear theories, could be used as benchmarks for checking the microscopic inputs of the newly improved structure models, and should trigger development of models including the treatments of both core excitation and continuum coupling effects.

Articles dans des revues avec comité de lecture
2012
Physics Letters B (Phys. Lett. B)
Publisher Elsevier
ISSN 0370-2693 
718
441-446

GANIL 2012-135 A
Expérience GANIL/SPIRAL
8He(p – t) – Transfer reaction – Borromean nucleus – Resonant states