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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, V
Jungclaus, A
Doornenbal, P
Wimmer, K
Gargano, A
Tostevin, JeffreyJ.Tostevin@surrey.ac.uk
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
Yalcinkaya, M
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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