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Searching for the H-5 resonance in the t+n+n system

AuthorsMeister, M.; Chulkov, L. V.; Simon, H.; Aumann, T.; García Borge, María José CSIC ORCID; Elze, Th. W.; Emling, H.; Geissel, H.; Hellström, M.; Jonson, B.; Kratz, J. V.; Kulessa, R.; Leifels, Y.; Markenroth, K.; Münzenberg, G.; Nickel, F.; Nilsson, T.; Nyman, G.; Pribora, V.; Richter, Achim W.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Tengblad, Olof CSIC ORCID
KeywordsNuclear Reactions C(6He,nt), (6He,2nt), E=240 MeV/nucleon
Measured, triton and neutron relative energy spectra, energy and angular correlations
4,5H deduced, resonance features
Hyperspherical harmonic expansion analysis
Comparisons with previous results
[PACS] Properties of specific nuclei listed by mass ranges: A ≤ 5
[PACS] Breakup and momentum distributions
Issue Date17-Apr-2003
CitationNuclear Physics A 723(1-2): 13–31 (2003)
AbstractThe 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-π = 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.
Description19 pages, 7 figures, 2 tables, 2 appendices.-- PACS nrs.: 27.10.+h; 25.60.Gc.-- Printed version published Jul 28, 2003.
Erratum to this paper (error in the calculation of resonance parameters) published in Nuclear Physics A 739(3-4): 353-354 (2004),
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