Beta-Decay Half-Lives beyond <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mmultiscripts> <mml:mrow> <mml:mi>Ca</mml:mi> </mml:mrow> <mml:mprescripts/> <mml:none/> <mml:mrow> <mml:mn>54</mml:mn> </mml:mrow
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 ^{54}Ca 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 quasirandom-phase approximation model with potential for making global predictions were also tested against the experimental results and good agreement was found.
Authors
- A. Tsantiri (ORCID: https://orcid.org/0000-0002-9759-3476)
- K. Fukushima (ORCID: https://orcid.org/0000-0002-7124-7591)
- Alexandra Fijalkowska
- S. Hanai
- B. Longfellow (ORCID: https://orcid.org/0000-0001-8743-962X)
- M. Karny (ORCID: https://orcid.org/0000-0002-1050-6203)
- R. Jain (ORCID: https://orcid.org/0000-0001-9859-1512)
- D. Hoskins
- Craig Harris (ORCID: https://orcid.org/0000-0002-4101-6098)
- H. Arora (ORCID: https://orcid.org/0000-0001-6183-658X)
- R. Grzywacz (ORCID: https://orcid.org/0000-0002-0920-2587)
- Sneha Neupane (ORCID: https://orcid.org/0000-0003-1643-2791)
- H. Schatz (ORCID: https://orcid.org/0000-0003-1674-4859)
- Vandana Tripathi (ORCID: https://orcid.org/0000-0002-8850-1357)
- K. Hermansen (ORCID: https://orcid.org/0000-0002-1707-0844)
- M. Wolińska-Cichocka (ORCID: https://orcid.org/0000-0002-7857-7796)
- D. Seweryniak (ORCID: https://orcid.org/0009-0003-3028-9693)
- E. Good (ORCID: https://orcid.org/0000-0001-7765-6188)
- R. Yokoyama
- M. Portillo (ORCID: https://orcid.org/0009-0004-9245-5092)
- S. Watters (ORCID: https://orcid.org/0000-0002-6243-394X)
- K. Siegl (ORCID: https://orcid.org/0000-0002-7778-315X)
- A. Ravlić (ORCID: https://orcid.org/0000-0001-9639-5382)
- M. Stepaniuk (ORCID: https://orcid.org/0000-0002-9631-1713)
- Martin Hausmann (ORCID: https://orcid.org/0000-0002-0696-0251)
- A. Spyrou (ORCID: https://orcid.org/0000-0002-8642-8352)
- S. Lyons (ORCID: https://orcid.org/0000-0002-0194-261X)
- A. Chester (ORCID: https://orcid.org/0000-0002-7625-7772)
- Adriana Sweet
- S. Uthayakumaar (ORCID: https://orcid.org/0000-0002-3154-0734)
- N. Kitamura (ORCID: https://orcid.org/0009-0002-8345-8481)
- Thomas Ruland (ORCID: https://orcid.org/0000-0003-3354-1754)
- I. Cox (ORCID: https://orcid.org/0000-0002-6807-3658)
- Jason A. Davis (ORCID: https://orcid.org/0009-0007-0135-2197)
- Kay Kolos
- Miguel Madurga
- G. Cerizza
- John C. Huffman
- Anonymous
- J. M. Christie
- T. J. Gray
- A. C. Hartley
- G. E. Rose
- J. R. Palomino
- M. M. Rajabali
- W. B. Walters
- M. Singh
- B. P. Crider
- N. D. Scielzo
- R. S. Lubna
- D. L. Bleuel
- B. M. Sherrill
- D. P. Scriven
- M. Mogannam
- I. Richardson
- E. Kwan
- H. C. Berg
- T. Gaballah
- A. L. Richard
- K. P. Rykaczewski
- O. B. Tarasov
- K. Bosmpotinis
- A. A. Doetsch
- A. Nowicki
- S. N. Liddick
- T. T. King
- K. Haak
- B. C. Rasco
- S. Ajayi
- G. Owens-Fryar
- M. K. Smith
- J. M. Allmond
- J. T. Harke
- M. P. Carpenter
- H. L. Crawford
- E. Ronning
- A. D. Ayangeakaa
- Z. Y. Xu
- D. E. M. Hoff
- J. M. Berkman
- J. G. Duarte
- B. A. Brown
- A. Laminack
- A. Estrade
- C. Frantzis
- T. H. Ogunbeku
Institutions
- Florida State University (US)
- Argonne National Laboratory (US)
- Lawrence Livermore National Laboratory (US)
- Oak Ridge National Laboratory (US)
- Pacific Northwest National Laboratory (US)
- Lawrence Berkeley National Laboratory (US)
- Central Michigan University (US)
- Duke University (US)
- University of Zagreb (HR)
- Ohio University (US)
- Facility for Rare Isotope Beams
- University of Warsaw (PL)
- Tennessee Technological University (US)
- University of Maryland, College Park (US)
- The University of Tokyo (JP)
- University of Tennessee at Knoxville (US)
- Michigan State University (US)
- University of California, Berkeley (US)
- Mississippi State University (US)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2026-01-20
- DOI
- https://doi.org/10.1103/5yrq-s3g5
- Primary Topic
- Nuclear physics research studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00