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    Beta-Decay Half-Lives beyond Ca54: A Systematic Survey of Decay Properties Approaching the Neutron Dripline

    W.-J. Ong1,*, Z. Y. Xu2, R. Grzywacz2, A. Ravlić3,4, I. Cox2, J. M. Allmond5, T. T. King5, B. C. Rasco5, K. P. Rykaczewski5 et al.

    H. Schatz6,3, B. M. Sherrill6,3, O. B. Tarasov3, B. A. Brown6,3, S. Ajayi7, H. Arora8, A. D. Ayangeakaa9,10, H. C. Berg6,3, J. M. Berkman11,3, D. L. Bleuel1, K. Bosmpotinis6,3, M. P. Carpenter12, G. Cerizza3, A. Chester3, J. M. Christie2, H. L. Crawford13, B. P. Crider14, J. Davis15, A. A. Doetsch6,3, J. G. Duarte1, A. Estrade8, A. Fijalkowska16, C. Frantzis6,3, K. Fukushima3, T. Gaballah14, T. J. Gray2,5, E. Good3,15, K. Haak6,3, S. Hanai17, A. C. Hartley6,3, J. T. Harke1, K. Hermansen6,3, C. Harris6,3, M. Hausmann3, D. E. M. Hoff1, D. Hoskins2, J. Huffman6,3, R. Jain1,6,3, M. Karny16, N. Kitamura2, K. Kolos1, E. Kwan3, A. Laminack5, S. N. Liddick11,3, B. Longfellow1, R. S. Lubna3, S. Lyons15, M. Madurga2, M. Mogannam11,3, S. Neupane2,1, A. Nowicki2, T. H. Ogunbeku1,14,3, G. Owens-Fryar6,3, J. R. Palomino14, M. Portillo3, M. M. Rajabali18, A. L. Richard1,19, I. Richardson6,3, E. Ronning11,3, G. E. Rose20, T. Ruland5, N. D. Scielzo1, D. P. Scriven3, D. Seweryniak12, K. Siegl2, M. Singh2, M. K. Smith3, A. Spyrou6,3, M. Stepaniuk16, A. Sweet1, V. Tripathi7, A. Tsantiri6,3,†, S. Uthayakumaar3, W. B. Walters21, S. Watters6,3, M. Wolinska-Cichocka22, and R. Yokoyama17

    • *Contact author: ong10@llnl.gov
    • †Present address: University of Regina, 3737 Wascana Parkway, Regina, Saskatchewan S4S 0A2, Canada.

    Phys. Rev. Lett. 136, 092502 – Published 4 March, 2026

    DOI: https://doi.org/10.1103/5yrq-s3g5

    Abstract

    In an experiment performed at the Facility for Rare Isotope Beams (FRIB) using the FRIB Decay Station initiator, 15 new half-lives of isotopes near Ca54 were measured. A new method of extracting lifetimes from experimental data, taking into account the unknown β-delayed neutron emission branches of very neutron-rich nuclei, was developed to enable systematic uncertainty analysis. The experiment observed a dramatic change in the half-life systematics for the isotopes with neutron number N=34. Beyond N=34, the decline of nuclear lifetime is much slower, leading to longer than anticipated lifetimes for near-dripline nuclei. State-of-the-art shell-model calculations can explain the experimental results, revealing the imprint of shell effects and the need for modification of single-particle neutron states. The results from a newly developed quasiparticle random phase approximation model with potential for making global predictions were also tested against the experimental results and good agreement was found.

    Physics Subject Headings (PhySH)

    Corrections

    2 April, 2026

    Correction: An error in wording in the last sentence of the Abstract and penultimate sentence of the second paragraph of the Introduction has been fixed.

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