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

Summary, in English

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.

• Author: M Meister; Karin Markenroth Bloch; D Aleksandrov; T Aumann; L Axelsson; T Baumann; M J G Borge; L V Chulkov; W Dostal; B Eberlein; Th W Elze; H Emling; C Forssen; H Geissel; Margareta Hellström; R Holzmann; B Jonson; J V Kratz; R Kulessa; Y Leifels; A Leistenschneider; I Mukha; G Münzenberg; F Nickel; T Nilsson; G Nyman; A Richter; K Riisager; C Scheidenberger; G Schrieder; H Simon; O Tengblad; M V Zhukov
• Publishing year: 2002
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 88
• Issue: 10
• Links: http://dx.doi.org/10.1103/PhysRevLett.88.102501
• Document type: Journal article
• Publisher: American Physical Society
• Status: Published
• ISBN/ISSN/Other: ISSN: 1079-7114