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Gamma decay of unbound neutron-hole states in 133Sn

Vaquero, V, Jungclaus, A, Doornenbal, P, Wimmer, K, Gargano, A, Tostevin, Jeffrey, Chen, S, Nacher, E, Sahin, E, Shiga, Y , Steppenbeck, D, Taniuchi, R, Xu, ZY, Ando, T, Baba, H, Bello Garrote, FL, Franchoo, S, Hadynska-Klek, K, Kusoglu, A, Liu, J, Lokotko, T, Momiyama, S, Motobayashi, T, Nagamine, S, Nakatsuka, N, Niikura, M, Orlandi, O, Saito, T, Sakurai, H, Soderstrom, PA, Tveten, GM, Vajta, Z and Yalcinkaya, M (2017) Gamma decay of unbound neutron-hole states in 133Sn Physical Review Letters, 118, 202502.

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Abstract

Excited states in the nucleus 133Sn, with one neutron outside the doubly-magic 132Sn core, were populated following one-neutron knockout from a 134Sn beam on a carbon target at relativistic energies at the Radioactive Isotope Beam Factory at RIKEN. Besides the rays emitted in the decay of the known neutron single-particle states in 133Sn additional strength in the energy range 3.5-5.5 MeV was observed for the fi rst time. Since the neutron-separation energy of 133Sn 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 fi ndings suggest that in the region south-east of 132Sn nuclear structure effects may play a signifi cant role in the neutron vs. 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 b -decay properties for astrophysical simulations may have to be reconsidered.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Vaquero, VUNSPECIFIEDUNSPECIFIED
Jungclaus, AUNSPECIFIEDUNSPECIFIED
Doornenbal, PUNSPECIFIEDUNSPECIFIED
Wimmer, KUNSPECIFIEDUNSPECIFIED
Gargano, AUNSPECIFIEDUNSPECIFIED
Tostevin, JeffreyJ.Tostevin@surrey.ac.ukUNSPECIFIED
Chen, SUNSPECIFIEDUNSPECIFIED
Nacher, EUNSPECIFIEDUNSPECIFIED
Sahin, EUNSPECIFIEDUNSPECIFIED
Shiga, YUNSPECIFIEDUNSPECIFIED
Steppenbeck, DUNSPECIFIEDUNSPECIFIED
Taniuchi, RUNSPECIFIEDUNSPECIFIED
Xu, ZYUNSPECIFIEDUNSPECIFIED
Ando, TUNSPECIFIEDUNSPECIFIED
Baba, HUNSPECIFIEDUNSPECIFIED
Bello Garrote, FLUNSPECIFIEDUNSPECIFIED
Franchoo, SUNSPECIFIEDUNSPECIFIED
Hadynska-Klek, KUNSPECIFIEDUNSPECIFIED
Kusoglu, AUNSPECIFIEDUNSPECIFIED
Liu, JUNSPECIFIEDUNSPECIFIED
Lokotko, TUNSPECIFIEDUNSPECIFIED
Momiyama, SUNSPECIFIEDUNSPECIFIED
Motobayashi, TUNSPECIFIEDUNSPECIFIED
Nagamine, SUNSPECIFIEDUNSPECIFIED
Nakatsuka, NUNSPECIFIEDUNSPECIFIED
Niikura, MUNSPECIFIEDUNSPECIFIED
Orlandi, OUNSPECIFIEDUNSPECIFIED
Saito, TUNSPECIFIEDUNSPECIFIED
Sakurai, HUNSPECIFIEDUNSPECIFIED
Soderstrom, PAUNSPECIFIEDUNSPECIFIED
Tveten, GMUNSPECIFIEDUNSPECIFIED
Vajta, ZUNSPECIFIEDUNSPECIFIED
Yalcinkaya, MUNSPECIFIEDUNSPECIFIED
Date : 17 May 2017
Copyright Disclaimer : Copyright 2017 American Physical Society
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 26 Apr 2017 08:30
Last Modified : 31 Oct 2017 19:19
URI: http://epubs.surrey.ac.uk/id/eprint/814027

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