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Título : Invariant mass spectrum and alpha-n correlation function studied in the fragmentation of He-6 on a carbon target
Autor : Aleksandrov, 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.
Palabras clave : Secondary radioactive beams
Exotic nuclei
Halo nuclei
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
Fecha de publicación : 13-Apr-1998
Editor: Elsevier
Resumen: Momentum 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.
Descripción : 13 pags, 5 figures.-- PACS nrs.: 24.60.−t; 25.70.Ef; 27.20.+n.
Versión del editor:
ISSN: 0375-9474
DOI: 10.1016/S0375-9474(98)00120-1
Citación : Nuclear Physics A 633(2): 234-246 (1998)
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