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Position of the single-particle 3/2− state in 135Sn and the N=90 subshell closure

Jungclaus, A. ; Doornenbal, P. ; Acosta, J. ; Vaquero, V. ; Browne, F. ; Cortes, M. L. ; Gargano, A. ; Koiwai, T. ; Naïdja, H. and Taniuchi, R. , et al. (2024) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 851.
Abstract

The decay of excited states of the nucleus 135Sn, with three neutrons outside the doubly-magic 132Sn core, was studied in an experiment performed at the Radioactive Isotope Beam Factory at RIKEN. Several γ rays emitted from excited 135Sn ions were observed following one-neutron and one-neutron-one-proton removal from 136Sn and 137Sb beams, respectively, on a beryllium target at relativistic energies. Based on the analogy to 133Sn populated via one-neutron removal from 134Sn, an excitation energy of 695(15) keV is assigned to the 3/2− state with strongest single-particle character in 135Sn. This result provides the first direct information... (More)

The decay of excited states of the nucleus 135Sn, with three neutrons outside the doubly-magic 132Sn core, was studied in an experiment performed at the Radioactive Isotope Beam Factory at RIKEN. Several γ rays emitted from excited 135Sn ions were observed following one-neutron and one-neutron-one-proton removal from 136Sn and 137Sb beams, respectively, on a beryllium target at relativistic energies. Based on the analogy to 133Sn populated via one-neutron removal from 134Sn, an excitation energy of 695(15) keV is assigned to the 3/2− state with strongest single-particle character in 135Sn. This result provides the first direct information about the evolution of the neutron shell structure beyond N=82 and thus allows for a crucial test of shell-model calculations in this region. The experimental findings are in full agreement with calculations performed employing microscopic effective two-body interactions derived from CD-Bonn and N3LO nucleon-nucleon potentials, which do not predict a pronounced subshell gap at neutron number N=90. The occurrence of such a gap in 140Sn, i.e., when the 1f7/2 orbital is completely filled, had been proposed in the past, in analogy to the magicity of 48Ca, featuring a completely filled 0f7/2 orbital one harmonic oscillator shell below.

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type
Contribution to journal
publication status
published
subject
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
851
article number
138561
publisher
Elsevier
external identifiers
  • scopus:85187928612
ISSN
0370-2693
DOI
10.1016/j.physletb.2024.138561
language
English
LU publication?
yes
id
f911ada9-8e0d-49b9-8198-362cfcbc218f
date added to LUP
2024-04-04 09:35:14
date last changed
2024-04-04 09:35:28
@article{f911ada9-8e0d-49b9-8198-362cfcbc218f,
  abstract     = {{<p>The decay of excited states of the nucleus <sup>135</sup>Sn, with three neutrons outside the doubly-magic <sup>132</sup>Sn core, was studied in an experiment performed at the Radioactive Isotope Beam Factory at RIKEN. Several γ rays emitted from excited <sup>135</sup>Sn ions were observed following one-neutron and one-neutron-one-proton removal from <sup>136</sup>Sn and <sup>137</sup>Sb beams, respectively, on a beryllium target at relativistic energies. Based on the analogy to <sup>133</sup>Sn populated via one-neutron removal from <sup>134</sup>Sn, an excitation energy of 695(15) keV is assigned to the 3/2<sup>−</sup> state with strongest single-particle character in <sup>135</sup>Sn. This result provides the first direct information about the evolution of the neutron shell structure beyond N=82 and thus allows for a crucial test of shell-model calculations in this region. The experimental findings are in full agreement with calculations performed employing microscopic effective two-body interactions derived from CD-Bonn and N3LO nucleon-nucleon potentials, which do not predict a pronounced subshell gap at neutron number N=90. The occurrence of such a gap in <sup>140</sup>Sn, i.e., when the 1f<sub>7/2</sub> orbital is completely filled, had been proposed in the past, in analogy to the magicity of <sup>48</sup>Ca, featuring a completely filled 0f<sub>7/2</sub> orbital one harmonic oscillator shell below.</p>}},
  author       = {{Jungclaus, A. and Doornenbal, P. and Acosta, J. and Vaquero, V. and Browne, F. and Cortes, M. L. and Gargano, A. and Koiwai, T. and Naïdja, H. and Taniuchi, R. and Tostevin, J. A. and Wimmer, K. and Algora, A. and Baba, H. and Fernández, A. and Lalović, N. and Nácher, E. and Rubio, B. and Sakurai, H.}},
  issn         = {{0370-2693}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Position of the single-particle 3/2<sup>−</sup> state in <sup>135</sup>Sn and the N=90 subshell closure}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2024.138561}},
  doi          = {{10.1016/j.physletb.2024.138561}},
  volume       = {{851}},
  year         = {{2024}},
}