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Properties of the 7He ground state from 8He neutron knockout

AuthorsAksyutina, Yu.; Johansson, H. T.; Aumann, T.; Boretzky, K.; García Borge, María José CSIC ORCID; Chatillon, A.; Chulkov, L. V.; Cortina-Gil, D.; Datta Pramanik, U.; Emling, H.; Forssén, C.; Fynbo, H. O. U.; Geissel, H.; Ickert, G.; Jonson, B.; Kulessa, R.; Langer, C.; Lantz, M.; LeBleis, T.; Lindahl, A. O.; Mahata, K.; Meister, M.; Münzenberg, G.; Nilsson, T.; Nyman, G.; Palit, R.; Paschalis, S.; Prokopowicz, W.; Reifarth, R.; Richter, Achim W.; Riisager, K.; Schrieder, G.; Simon, H.; Sümmerer, K.; Tengblad, Olof CSIC ORCID ; Weick, H.; Zhukov, M. V.
Keywords[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
Issue Date28-Jul-2009
CitationPhysics Letters B 679(3): 191–196 (2009)
AbstractThe unbound nucleus 7He, produced in neutron-knockout reactions with a 240 MeV/u 8He beam in a liquid-hydrogen target, has been studied in an experiment at the ALADIN-LAND setup at GSI. From an R-matrix analysis the resonance parameters for 7He as well as the spectroscopic factor for the 6He(0+)+n configuration in its ground-state have been obtained. The spectroscopic factor is 0.61 confirming that 7He is not a pure single-particle state. An analysis of 5He data from neutron-knockout reactions of 6He in a carbon target reveals the presence of an s-wave component at low energies in the α +n relative energy spectrum. A possible low-lying exited state in 7He observed in neutron knockout data from 8He in a carbon target and tentatively interpreted as a Iπ = 1/2− state, could not be observed in the present experiment. Possible explanations of the shape difference between the 7He resonance obtained in the two knockout reactions are discussed in terms of target-dependence or different reaction mechanisms at relativistic energies.
Description6 pages, 3 tables, 3 figures.--PACS nrs.: 27.20.+n.--Printes version published Aug 24, 2009
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