Journal
NUCLEAR PHYSICS A
Volume 723, Issue 1-2, Pages 13-31Publisher
ELSEVIER
DOI: 10.1016/S0375-9474(03)01312-5
Keywords
NUCLEAR REACTIONS C(He-6, nt), (He-6, 2nt), E=240 MeV/nucleon; measured triton and neutron relative energy spectra, energy and angular correlations. H-4,H-5 deduced resonance features; hyperspherical harmonic expansion analysis; comparisons with previous results
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The unbound hydrogen isotopes H-4,H-5 have been studied in the one-proton knockout channel of He-6 (240 MeV/u) impinging on a carbon target. The triton fragments originating from this channel were detected in coincidence with neutrons. Relative energy spectra as well as energy and angular correlations have been studied for the t + n and t + n + n systems. The analysis of the energy and angular correlations by the method of hyperspherical harmonic expansion allows to determine the relative weights of the most relevant partial waves in the three-body t + n + n final state. It is shown that the neutrons to a large extent occupy the p-shell and that the I-pi = 1/2(+) state is strongly populated as expected for the H-5 ground state. No evidence for a narrow resonance in the t + n + n system is obtained, instead a broad structure peaked at 3 MeV above the threshold with about 6 MeV as a full width at half maximum is observed. The two-body t + n system reveals a resonance compatible with earlier results for H-4. (C) 2003 Elsevier Science B.V. All rights reserved.
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