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

A. Jungclaus; P. Doornenbal; J. Acosta; V. Vaquero; F. Browne; M.L. Cortes; A. Gargano; T. Koiwai; H. Naïdja; R. Taniuchi; J.A. Tostevin; K. Wimmer; A. Algora; H. Baba; A. Fernández; N. Lalovic; E. Nacher; B. Rubio; H. Sakurai

doi:10.1016/j.physletb.2024.138561

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

A. Jungclaus, P. Doornenbal, J. Acosta, V. Vaquero, F. Browne, M.L. Cortes, A. Gargano, T. Koiwai, H. Naïdja, R. Taniuchi, J.A. Tostevin, K. Wimmer, A. Algora, H. Baba, A. Fernández, N. Lalovic, E. Nacher, B. Rubio, H. Sakurai

Physics

Research output: Contribution to journal › Article › peer-review

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 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.

Original language	English
Article number	138561
Number of pages	5
Journal	Physics Letters B
Volume	851
Early online date	13 Mar 2024
DOIs	https://doi.org/10.1016/j.physletb.2024.138561
Publication status	Published - 1 Apr 2024

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Position of the single-particle 3/2− state in 135Sn and the 𝑁=90 subshell closure
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Jungclaus, A., Doornenbal, P., Acosta, J., Vaquero, V., Browne, F., Cortes, M. L., Gargano, A., Koiwai, T., Naïdja, H., Taniuchi, R., Tostevin, J. A., Wimmer, K., Algora, A., Baba, H., Fernández, A., Lalovic, N., Nacher, E., Rubio, B., & Sakurai, H. (2024). Position of the single-particle 3/2− state in 135Sn and the N=90 subshell closure. Physics Letters B, 851, Article 138561. https://doi.org/10.1016/j.physletb.2024.138561

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

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 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.",

author = "A. Jungclaus and P. Doornenbal and J. Acosta and V. Vaquero and F. Browne and M.L. Cortes and A. Gargano and T. Koiwai and H. Na{\"i}dja and R. Taniuchi and J.A. Tostevin and K. Wimmer and A. Algora and H. Baba and A. Fern{\'a}ndez and N. Lalovic and E. Nacher and B. Rubio and H. Sakurai",

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year = "2024",

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day = "1",

doi = "10.1016/j.physletb.2024.138561",

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Jungclaus, A, Doornenbal, P, Acosta, J, Vaquero, V, Browne, F, Cortes, ML, Gargano, A, Koiwai, T, Naïdja, H, Taniuchi, R, Tostevin, JA, Wimmer, K, Algora, A, Baba, H, Fernández, A, Lalovic, N, Nacher, E, Rubio, B & Sakurai, H 2024, 'Position of the single-particle 3/2− state in 135Sn and the N=90 subshell closure', Physics Letters B, vol. 851, 138561. https://doi.org/10.1016/j.physletb.2024.138561

TY - JOUR

T1 - Position of the single-particle 3/2− state in 135Sn and the N=90 subshell closure

AU - Jungclaus, A.

AU - Doornenbal, P.

AU - Acosta, J.

AU - Vaquero, V.

AU - Browne, F.

AU - Cortes, M.L.

AU - Gargano, A.

AU - Koiwai, T.

AU - Naïdja, H.

AU - Taniuchi, R.

AU - Tostevin, J.A.

AU - Wimmer, K.

AU - Algora, A.

AU - Baba, H.

AU - Fernández, A.

AU - Lalovic, N.

AU - Nacher, E.

AU - Rubio, B.

AU - Sakurai, H.

PY - 2024/4/1

Y1 - 2024/4/1

N2 - 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.

AB - 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.

U2 - 10.1016/j.physletb.2024.138561

DO - 10.1016/j.physletb.2024.138561

M3 - Article

SN - 0370-2693

VL - 851

JO - Physics Letters B

JF - Physics Letters B

M1 - 138561

ER -