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Gamma Decay of Unbound Neutron-Hole States in Sn 133

AutorVaquero, Víctor; Jungclaus, Andrea ; Doornenbal, P.; Wimmer, K.; Gargano, A.; Tostevin, J. A.; Chen, S.; Nácher, Enrique ; Vajta, Z.; Yalcinkaya, M.
Fecha de publicación17-may-2017
EditorAmerican Physical Society
CitaciónPhysical Review Letters 118:202502 (2017)
ResumenExcited states in the nucleus Sn133, with one neutron outside the double magic Sn132 core, were populated following one-neutron knockout from a Sn134 beam on a carbon target at relativistic energies at the Radioactive Isotope Beam Factory at RIKEN. Besides the γ rays emitted in the decay of the known neutron single-particle states in Sn133 additional γ strength in the energy range 3.5-5.5 MeV was observed for the first time. Since the neutron-separation energy of Sn133 is low, Sn=2.402(4) MeV, this observation provides direct evidence for the radiative decay of neutron-unbound states in this nucleus. The ability of electromagnetic decay to compete successfully with neutron emission at energies as high as 3 MeV above threshold is attributed to a mismatch between the wave functions of the initial and final states in the latter case. These findings suggest that in the region southeast of Sn132 nuclear structure effects may play a significant role in the neutron versus γ competition in the decay of unbound states. As a consequence, the common neglect of such effects in the evaluation of the neutron-emission probabilities in calculations of global β-decay properties for astrophysical simulations may have to be reconsidered.
DescripciónV. Vaquero et al. -- 5 pags., 4 figs.
Versión del editorhttps://doi.org/10.1103/PhysRevLett.118.202502
Identificadoresdoi: 10.1103/PhysRevLett.118.202502
issn: 1079-7114
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