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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
EditorAmerican Physical Society
Citación Physical Review Letters 88(10): 102501 (2002)
ResumenLow-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
Versión del editorhttp://dx.doi.org/10.1103/PhysRevLett.88.102501
URI http://hdl.handle.net/10261/7443
DOI10.1103/PhysRevLett.88.102501
ISSN0031-9007
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