Evidence for a new low-lying resonance state in 7He

Low-lying resonance states in 7He(6He+n), formed after fragmentation reactions of a 227 MeV/nucleon 8He beam on a carbon target, have been studied. Coincidences between 6He nuclei and neutrons, corresponding to the one-neutron knockout channel in 8He, were selected. The relative energy spectrum in t...

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Published in:Physical review letters 2002-03, Vol.88 (10), p.102501-102501
Main Authors: Meister, M, Markenroth, K, Aleksandrov, D, Aumann, T, Axelsson, L, Baumann, T, Borge, M J G, Chulkov, L V, Dostal, W, Eberlein, B, Elze, Th W, Emling, H, Forssén, C, Geissel, H, Hellström, M, Holzmann, R, Jonson, B, Kratz, J V, Kulessa, R, Leifels, Y, Leistenschneider, A, Mukha, I, Münzenberg, G, Nickel, F, Nilsson, T, Nyman, G, Richter, A, Riisager, K, Scheidenberger, C, Schrieder, G, Simon, H, Tengblad, O, Zhukov, M V
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Language:English
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Summary:Low-lying resonance states in 7He(6He+n), formed after fragmentation reactions of a 227 MeV/nucleon 8He beam on a carbon target, have been studied. Coincidences between 6He nuclei and neutrons, corresponding to the one-neutron knockout channel in 8He, were selected. The relative energy spectrum in the 6He+n system shows a structure, which is interpreted as the 7He ( Ipi = 3/2(-)) ground state, unbound with 0.43(2) MeV relative to the 6He+n system and a width of Gamma = 0.15(8) MeV overlapping with an excited ( Ipi = 1/2(-)) state observed at 1.0(1) MeV with a width of Gamma = 0.75(8) MeV.
ISSN:0031-9007