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Title

Invariant mass spectrum and alpha-n correlation function studied in the fragmentation of He-6 on a carbon target

AuthorsAleksandrov, D.; Aumann, T.; Axelsson, L.; Baumann, T.; García Borge, María José ; Chulkov, L. V.; Cub, J.; Dostal, W.; Eberlein, B.; Elze, Th. W.; Emling, H.; Geissel, H.; Goldberg, V. Z.; Golovkov, M.; Grünschloß, A.; Hellström, M.; Holeczek, J.; Holzmann, R.; Jonson, B.; Korshenninikov, A. A.; Kratz, J. V.; Kraus, G.; Kulessa, R.; Leifels, Y.; Leistenschneiderg, A.; Leth, T.; Mukha, I. ; Münzenberg, G.; Nickel, F.; Nilsson, T.; Nyman, G.; Petersen, B.; Pfützner, M.; Richter, Achim W.; Riisager, K.; Scheidenberger, C.; Schrieder, G.; Schwab, W.; Simon, H.; Smedberg, M. H.; Steiner, M.; Stroth, J.; Surowiec, A.; Suzuki, T.; Tengblad, Olof ; Zhukov, M. V.
KeywordsSecondary radioactive beams
Exotic nuclei
Halo nuclei
He-6
He-5
Momentum distributions
Invariant mass spectra
Fragmentation mechanism
Breakup reactions
[PACS] Reactions induced by unstable nuclei
[PACS] Resonances
[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
Issue Date13-Apr-1998
PublisherElsevier
CitationNuclear Physics A 633(2): 234-246 (1998)
AbstractMomentum distributions and invariant mass spectra from the breakup of He-6 ions with an energy of 240 MeV/u interacting with a carbon target have been studied. The data were used to extract information about the reaction mechanism which is influenced by the structure of He-6. It is found that the dominant reaction mechanism is a two-step process: knock out of one neutron followed by the decay of the He-5 resonance. The shape of the (α+n) two-body invariant mass spectrum is interpreted as mainly reflecting the 5He ground state which is a J(π) = 3/2(-) resonance. However, no evidence for correlations between cu particles and neutrons is observed in the momentum widths of the distributions. It is demonstrated that a combined analysis of the two-body invariant mass spectrum and an appropriate correlation function may be used to determine the properties of the intermediate resonance.
Description13 pags, 5 figures.-- PACS nrs.: 24.60.−t; 25.70.Ef; 27.20.+n.
Publisher version (URL)http://dx.doi.org/10.1016/S0375-9474(98)00120-1
URIhttp://hdl.handle.net/10261/10231
DOI10.1016/S0375-9474(98)00120-1
ISSN0375-9474
Appears in Collections:(CFMAC-IEM) Artículos
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