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Título : Evidence for a new low-lying resonance state in He-7
Autor : Meister, M., Markenroth, K., Aleksandrov, D., Aumann, T., Axelsson, L., Baumann, T., García Borge, María José, Chulkov, L. V., Dostal, W., Eberlein, B., Elze, Th. W., Emling, H., Forssén, C., Geissel, H., Hellström, M., Holzmann, R., Jonson, B., Kratz, J. V., Kulessa, R., Leifels, Y., Leistenschneider, A., Mukha, I., Münzenberg, G., Nickel, F., Nilsson, T., Nyman, G., Richter, Achim W., Riisager, K., Scheidenberger, C., Schrieder, G., Simon, H., Tengblad, Olof, Zhukov, M. V.
Palabras clave : [PACS] Other resonances
[PACS] Reactions induced by unstable nuclei
[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19
Fecha de publicación : 26-Feb-2002
Editor: American Physical Society
Resumen: Low-lying resonance states in He-7(He-6 + n), formed after fragmentation reactions of a 227 MeV/nucleon He-8 beam on a carbon target, have been studied. Coincidences between He-6 nuclei and neutrons, corresponding to the one-neutron knockout channel in He-8, were selected. The relative energy spectrum in the He-6 + n system shows a structure, which is interpreted as the He-7 (Iπ = 3/2(-)) ground state, unbound with 0.43(2) MeV relative to the He-6 + n system and a width of Γ = 0.15(8) MeV overlapping with an excited (Iπ = 1/2(-)) state observed at 1.0(1) MeV with a width of Γ = 0.75(8) MeV.
Descripción : 4 pages, 1 table, 4 figures.-- Printed version published Mar 11, 2002.-- PACS nrs: 24.30.Gd; 25.60.-t; 27.20.+n
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ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.88.102501
Citación : Physical Review Letters 88(10): 102501 (2002)
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