Yrast-state lifetimes in <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Pd</mi><mprescripts></mprescripts><none></none><mn>94</mn></mmultiscripts></math> at the transition between the isoscalar and isovector coupling regimes

Y. Jang; B. Moon; J. Lee; H. Watanabe; S. Nishimura; V. Phong; Q. Zeng; M. Liu; H. Baba; S. Bae; A. M. Bruce; H. Chen; S. Choi; A. Esmaylzadeh; J. Fischer; L. M. Fraile; N. Fukuda; G. Garcia De Lorenzo; S. Go; A. Görgen; M. Górska; S. Guo; K. I. Hahn; J. S. Heines; B. Hong; Y. H. Kim; R. Lozeva; S. Michimasa; M. Mikolajczuk; A. I. Morales; J. Park; S. Pascu; Zs. Podolyàk; P. H. Regan; E. Sahin; H. Sakurai; Y. Shimizu; H. Suzuki; H. Takeda; Y. Togano; T. T. Yeung; M. Yoshimoto; C. Yuan

doi:10.1103/smjm-rplr

Yrast-state lifetimes in ${}^{94}{Pd}$ at the transition between the isoscalar and isovector coupling regimes

Y. Jang ^1,2, B. Moon ^2,3,*, J. Lee ^1,2, H. Watanabe^2,3,4, S. Nishimura³, V. Phong³, Q. Zeng⁵, M. Liu², H. Baba³ et al.

S. Bae ⁶, A. M. Bruce⁷, H. Chen⁵, S. Choi⁸, A. Esmaylzadeh ⁹, J. Fischer ⁹, L. M. Fraile ^10,11, N. Fukuda³, G. Garcia De Lorenzo ¹¹, S. Go³, A. Görgen ^12,13, M. Górska¹⁴, S. Guo ⁵, K. I. Hahn², J. S. Heines ^12,13, B. Hong ¹, Y. H. Kim ², R. Lozeva ¹⁵, S. Michimasa ³, M. Mikolajczuk^14,16, A. I. Morales ^17,3, J. Park ^18,2, S. Pascu ^19,20, Zs. Podolyàk ²⁰, P. H. Regan ^20,21, E. Sahin^12,13, H. Sakurai ³, Y. Shimizu³, H. Suzuki³, H. Takeda³, Y. Togano ³, T. T. Yeung ^22,3, M. Yoshimoto ³, and C. Yuan ²³

¹Department of Physics, Korea University, Seoul 02841, Republic of Korea
²Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea
³RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
⁴School of Physics, Beihang University, Beijing 100191, China
⁵Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
⁶Center for Nuclear Study, University of Tokyo, Saitama 351-0198, Japan
⁷School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
⁸Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
⁹Institut für Kernphysik, Universität zu Köln, D-50937 Cologne, Germany
¹⁰CERN, 1211 Geneva 23, Switzerland
¹¹Grupo de Fìsica Nuclear and IPARCOS, Universidad Complutense de Madrid, 28040 Madrid, Spain
¹²Department of Physics, University of Oslo, 0316 Oslo, Norway
¹³Norwegian Nuclear Research Centre, 0316 Oslo, Norway
¹⁴GSI Helmoltzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
¹⁵Université Paris-Saclay, IJCLab, CNRS/IN2P3, F-91405 Orsay, France
¹⁶Faculty of Physics, University of Warsaw, 00-927 Warsaw, Poland
¹⁷Instituto de Fìsica Corpuscular, Universitat de València, 46010 València, Spain
¹⁸Department of Physics, Hope College, Holland, Michigan 49423, USA
¹⁹Horia Hulubei National Institute of Research and Development in Physics and Nuclear Engineering (IFIN-HH), Magurele 077125, Romania
²⁰Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
²¹Medical, Marine and Nuclear Department, National Physical Laboratory, Teddington TW11 0LW, United Kingdom
²²Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
²³Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China

^*Contact author: mb0316@ibs.re.kr

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Phys. Rev. C 114, 024342 – Published 25 August, 2026

DOI: https://doi.org/10.1103/smjm-rplr

Abstract

Half-lives of yrast excited states in ${}^{94}{Pd}$ were measured using isomeric decay spectroscopy. The experiment was performed at Radioactive Isotope Beam Factory, where ${}^{94}{Pd}$ ions were produced via in-flight fragmentation of a ${}^{124}{Xe}$ beam impinging on a ${}^{9}{Be}$ target. These ions were implanted into the GARi active stopper array, and isomeric delayed $γ$ rays were detected with the IDATEN fast-timing array consisting of 48 ${LaBr}_{3}$ (Ce) detectors. The half-lives were determined using the generalized centroid difference method, yielding the $T_{1 / 2}$ values of $\leq 15$ ps, 13(11) ps, $\leq 13$ ps, 693(72) ps, and $\leq 19$ ps for the $(2_{1}^{+}), (4_{1}^{+}), (6_{1}^{+}), (8_{1}^{+})$ , and $(10_{1}^{+})$ states, respectively. Reduced transition probabilities were deduced from the measured half-lives and discussed in the context of shell-model calculations employing the JUN45 effective interaction. The results indicate that ${}^{94}{Pd}$ , with $N = Z + 2$ , lies in a transitional regime between the $N = Z$ isoscalar-pairing domain ( ${}^{92}{Pd}$ ) and the $N = 50$ isovector-dominated region ( ${}^{96}{Pd}$ ).

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Yrast-state lifetimes in ${}^{94}{Pd}$ at the transition between the isoscalar and isovector coupling regimes

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Yrast-state lifetimes in Pd94 at the transition between the isoscalar and isovector coupling regimes

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Yrast-state lifetimes in ${}^{94}{Pd}$ at the transition between the isoscalar and isovector coupling regimes