Tawfik Gaballah
(Mississippi state university)
The study of nuclear structure in regions of extreme neutron excess provides stringent tests of shell-model predictions. Experiments at the Facility for Rare Isotope Beams (FRIB) continue to explore nuclei at the limits of stability. On the neutron-rich side, crossing from $N = 20$ toward the $N = 28$ island of inversion, the isotopes $^{31}\mathrm{F}$ and $^{37}\mathrm{Na}$ lie at or very near the neutron drip line in this region. In this work, we report the first $\beta$-decay half-life measurements of $^{31}\mathrm{F}$ and $^{37}\mathrm{Na}$, utilizing the state-of-the-art experimental setup of the FRIB Decay Station Initiator (FDSi).
The reported results represent the shortest $\beta$-decay half-lives measured to date and serve as sensitive benchmarks for theoretical shell-model calculations in the $N = 20\text{--}28$ region. Comparisons with calculations using the sdpf-m [1] and SDPFSDG-MU [2] interactions show overall good agreement within uncertainties associated with the effective interactions and adopted $Q_{\beta}$ values. However, further investigations are ongoing to understand differences between interactions and localized discrepancies with experiment, particularly in relation to the role of cross-shell excitations and intruder configurations.
References
[1] Y. Utsuno et al., Phys. Rev. C 60, 054315 (1999).
[2] S. Yoshida et al., Phys. Rev. C 97, 054321 (2018).
Acknowledgment
This work was supported by the U.S. Department of Energy (DOE) and the National Science Foundation (NSF) under Grant Nos. PHY-1848177 (CAREER) and PHY-2412343.
Tawfik Gaballah
(Mississippi state university)
Ben Crider
(Mississippi State University)
Sean Liddick
(NSCL / MSU)
Heather Crawford
(Lawrence Berkeley National Laboratory)
Rebeka Lubna
(Facility for Rare Isotope Beams)
James Allmond
(ORNL)
Prof.
Vandana Tripathi
(Florida State University)
Robert Grzywacz
(University of Tennessee)
Honey Arora
(Center for Exotic Nuclear Studies, IBS)
Corrigan Appleton
(Lawrence Berkeley National Laboratory)
Samuel Ajayi
(Florida State University)
Peter Bender
(University of Massachusetts)
Caleb Benetti
(Facility for Rare Isotope Beams)
Jessica Berkman
(FRIB/MSU)
Nico Braukman
(University of Tennessee Knoxville)
C. M. Campbell
(Lawrence Berkeley National Laboratory)
Micahel Carpenter
(Argonne National Laboratory,)
James Christie
(University of Tennessee Knoxville)
Roderick Clark
(Lawrence Berkley National Laboratory)
Joseph Dopfer
(FRIB/ MSU)
Amelia Doetsch
(FRIB/MSU)
Paul Fallon
(Lawrence Berkeley National Laboratory)
Rahul Jain
(Lawrence Livermore National Laboratory)
Noritaka Kitamura
(Center for Nuclear Study, University of Tokyo)
Thomas King
(University of Tennessee Knoxville)
Kay Kolos
(Lawrence Livermore National Laboratory)
B. Longfellow
(Lawerence Livermore National Laboratory)
Miguel Madurga
(University of Tennessee, Knoxville)
Mejdi Mogannam
(Air Force Institute of Technology)
Shree Neupane
(Lawrence Livermore National Laboratory (LLNL))
Eleanor Ronning
(INFN Padova)
Krzysztof Rykaczewski
(Oak Ridge National Laboratory)
Dustin Scriven
(Facility for Rare Isotope Beams)
Artemis Spyrou
(Michigan State University)
Sam Tabor
(Florida State University)
Mac Wheeler
(Florida State University)
Catur Wibisono
(Florida State University)
Mathis Wiedeking
(Lawrence Berkley National Laboratory)
Zhengyu Xu
(University of Tennessee, Knoxville)
Yiyi Zhu
(TRIUMF)
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