Phys. Rev. Lett. 88, 102501 (2002) [4 pages]Evidence for a New Low-Lying Resonance State in 7HeReceived 26 February 2001; revised 26 December 2001; published 26 February 2002 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 ( Iπ = 3/2-) ground state, unbound with 0.43(2) MeV relative to the 6He+n system and a width of Γ = 0.15(8)MeV overlapping with an excited ( Iπ = 1/2-) state observed at 1.0(1) MeV with a width of Γ = 0.75(8)MeV. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.102501
DOI:
10.1103/PhysRevLett.88.102501
PACS:
24.30.Gd, 25.60.-t, 27.20.+n
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