Evidence for an isomeric π1/2+[411] 183Ta

S. Doshi; P. M. Walker; A. M. Bruce; S. Pascu; Zsolt Podolyák; G. Bartram; N. Chandrakumar; J. Chen; J. G. Cubiss; S. Dutt; J. Gada; S. Guo; Y. Hirayama; G. Hudson-Chang; S. Kimura; F. G. Kondev; G. J. Lane; G. Li; Yu A. Litvinov; Z. Liu; P. Ma; P. Schury; A. Takamine; M. Wada; H. Watanabe; Y. X. Watanabe; J. Yap

doi:10.1140/epja/s10050-025-01776-2

Evidence for an isomeric π1/2+[411] 183Ta

S. Doshi
, P. M. Walker
, A. M. Bruce
, S. Pascu
, Zsolt Podolyák
, G. Bartram
, N. Chandrakumar
, J. Chen
, J. G. Cubiss
, S. Dutt
, J. Gada
, S. Guo
, Y. Hirayama
, G. Hudson-Chang
, S. Kimura
, F. G. Kondev
, G. J. Lane
, G. Li
, Yu A. Litvinov
, Z. Liu

P. Ma, P. Schury, A. Takamine, M. Wada, H. Watanabe, Y. X. Watanabe, J. Yap

School of Arch, Tech and Eng

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

Abstract

We report on the identification of a new isomeric state in 183183Ta populated via the ground-state ββ-decay of 183183Hf. The experiment was performed at the KISS setup at RIKEN, where neutron-rich hafnium isotopes were produced via multi-nucleon transfer (MNT) reactions, followed by laser ionization of hafnium atoms, mass separation, and detection using an electron-gamma coincidence system. Isomeric spectroscopy was carried out by gating on different electron-gamma time correlations. A 459.1 keV γγ-ray transition was identified in delayed spectra, and a half-life of 41^{+6}_{-4}~\upmu s was extracted through time-distribution fitting. The 459.1 keV state in 183183Ta is known from previous work and has been assigned a Nilsson orbital configuration of 5/2+[402]5/2+[402], while a proposed new isomeric state above it is interpreted as a 1/2+[411]1/2+[411] configuration that decays to 5/2+[402]5/2+[402] via a low-energy, unobserved E2 transition. This is consistent with the systematic trends in neighbouring odd-A nuclei and transition rate calculations.

Original language	English
Article number	17
Journal	The European Physical Journal A
Volume	62
Issue number	1
DOIs	https://doi.org/10.1140/epja/s10050-025-01776-2
Publication status	Published - 23 Jan 2026

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Doshi, S., Walker, P. M., Bruce, A. M., Pascu, S., Podolyák, Z., Bartram, G., Chandrakumar, N., Chen, J., Cubiss, J. G., Dutt, S., Gada, J., Guo, S., Hirayama, Y., Hudson-Chang, G., Kimura, S., Kondev, F. G., Lane, G. J., Li, G., Litvinov, Y. A., ... Yap, J. (2026). Evidence for an isomeric π1/2+[411] 183Ta. The European Physical Journal A, 62(1), Article 17. https://doi.org/10.1140/epja/s10050-025-01776-2

@article{db32834ec48340bc9b20076e062abf92,

title = "Evidence for an isomeric π1/2+[411] 183Ta",

abstract = "We report on the identification of a new isomeric state in 183183Ta populated via the ground-state ββ-decay of 183183Hf. The experiment was performed at the KISS setup at RIKEN, where neutron-rich hafnium isotopes were produced via multi-nucleon transfer (MNT) reactions, followed by laser ionization of hafnium atoms, mass separation, and detection using an electron-gamma coincidence system. Isomeric spectroscopy was carried out by gating on different electron-gamma time correlations. A 459.1 keV γγ-ray transition was identified in delayed spectra, and a half-life of 41\textasciicircum{}\{+6\}\_\{-4\}\textasciitilde{}\textbackslash{}upmu s was extracted through time-distribution fitting. The 459.1 keV state in 183183Ta is known from previous work and has been assigned a Nilsson orbital configuration of 5/2+[402]5/2+[402], while a proposed new isomeric state above it is interpreted as a 1/2+[411]1/2+[411] configuration that decays to 5/2+[402]5/2+[402] via a low-energy, unobserved E2 transition. This is consistent with the systematic trends in neighbouring odd-A nuclei and transition rate calculations.",

author = "S. Doshi and Walker, \{P. M.\} and Bruce, \{A. M.\} and S. Pascu and Zsolt Podoly{\'a}k and G. Bartram and N. Chandrakumar and J. Chen and Cubiss, \{J. G.\} and S. Dutt and J. Gada and S. Guo and Y. Hirayama and G. Hudson-Chang and S. Kimura and Kondev, \{F. G.\} and Lane, \{G. J.\} and G. Li and Litvinov, \{Yu A.\} and Z. Liu and P. Ma and P. Schury and A. Takamine and M. Wada and H. Watanabe and Watanabe, \{Y. X.\} and J. Yap",

year = "2026",

month = jan,

day = "23",

doi = "10.1140/epja/s10050-025-01776-2",

language = "English",

volume = "62",

number = "1",

}

Doshi, S, Walker, PM, Bruce, AM, Pascu, S, Podolyák, Z, Bartram, G, Chandrakumar, N, Chen, J, Cubiss, JG, Dutt, S, Gada, J, Guo, S, Hirayama, Y, Hudson-Chang, G, Kimura, S, Kondev, FG, Lane, GJ, Li, G, Litvinov, YA, Liu, Z, Ma, P, Schury, P, Takamine, A, Wada, M, Watanabe, H, Watanabe, YX & Yap, J 2026, 'Evidence for an isomeric π1/2+[411] 183Ta', The European Physical Journal A, vol. 62, no. 1, 17. https://doi.org/10.1140/epja/s10050-025-01776-2

TY - JOUR

T1 - Evidence for an isomeric π1/2+[411] 183Ta

AU - Doshi, S.

AU - Walker, P. M.

AU - Bruce, A. M.

AU - Pascu, S.

AU - Podolyák, Zsolt

AU - Bartram, G.

AU - Chandrakumar, N.

AU - Chen, J.

AU - Cubiss, J. G.

AU - Dutt, S.

AU - Gada, J.

AU - Guo, S.

AU - Hirayama, Y.

AU - Hudson-Chang, G.

AU - Kimura, S.

AU - Kondev, F. G.

AU - Lane, G. J.

AU - Li, G.

AU - Litvinov, Yu A.

AU - Liu, Z.

AU - Ma, P.

AU - Schury, P.

AU - Takamine, A.

AU - Wada, M.

AU - Watanabe, H.

AU - Watanabe, Y. X.

AU - Yap, J.

PY - 2026/1/23

Y1 - 2026/1/23

N2 - We report on the identification of a new isomeric state in 183183Ta populated via the ground-state ββ-decay of 183183Hf. The experiment was performed at the KISS setup at RIKEN, where neutron-rich hafnium isotopes were produced via multi-nucleon transfer (MNT) reactions, followed by laser ionization of hafnium atoms, mass separation, and detection using an electron-gamma coincidence system. Isomeric spectroscopy was carried out by gating on different electron-gamma time correlations. A 459.1 keV γγ-ray transition was identified in delayed spectra, and a half-life of 41^{+6}_{-4}~\upmu s was extracted through time-distribution fitting. The 459.1 keV state in 183183Ta is known from previous work and has been assigned a Nilsson orbital configuration of 5/2+[402]5/2+[402], while a proposed new isomeric state above it is interpreted as a 1/2+[411]1/2+[411] configuration that decays to 5/2+[402]5/2+[402] via a low-energy, unobserved E2 transition. This is consistent with the systematic trends in neighbouring odd-A nuclei and transition rate calculations.

AB - We report on the identification of a new isomeric state in 183183Ta populated via the ground-state ββ-decay of 183183Hf. The experiment was performed at the KISS setup at RIKEN, where neutron-rich hafnium isotopes were produced via multi-nucleon transfer (MNT) reactions, followed by laser ionization of hafnium atoms, mass separation, and detection using an electron-gamma coincidence system. Isomeric spectroscopy was carried out by gating on different electron-gamma time correlations. A 459.1 keV γγ-ray transition was identified in delayed spectra, and a half-life of 41^{+6}_{-4}~\upmu s was extracted through time-distribution fitting. The 459.1 keV state in 183183Ta is known from previous work and has been assigned a Nilsson orbital configuration of 5/2+[402]5/2+[402], while a proposed new isomeric state above it is interpreted as a 1/2+[411]1/2+[411] configuration that decays to 5/2+[402]5/2+[402] via a low-energy, unobserved E2 transition. This is consistent with the systematic trends in neighbouring odd-A nuclei and transition rate calculations.

U2 - 10.1140/epja/s10050-025-01776-2

DO - 10.1140/epja/s10050-025-01776-2

M3 - Article

VL - 62

JO - The European Physical Journal A

JF - The European Physical Journal A

IS - 1

M1 - 17

ER -

Evidence for an isomeric π1/2+[411] 183Ta

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