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Isomers and hindrances in No254: A touchstone for theories of superheavy nuclei

S. G. Wahid1,*, P. Chowdhury1,†, D. Seweryniak2, T. L. Khoo2, F. G. Kondev2, R. M. Clark3, B. B. Back2,‡, P. C. Bender1, M. P. Carpenter2 et al.

P. A. Copp2, K. Hauschild4, G. Henning5, R.-D. Herzberg6, D. E. M. Hoff1,§, T. Huang7,2, H. Jayatissa2, A. Korichi8, T. Lauritsen2, A. Lopez-Martens4, G. Morgan9, C. Morse3,∥, C. Müller-Gatermann2, D. H. Potterveld2, W. Reviol2, A. M. Rogers1, S. Saha1, G. Savard2, K. Sharma1, S. Waniganeththi1, G. L. Wilson2, J. Wu2,∥, and S. Zhu10,‡

  • *Contact author: sgwahid@gmail.com
  • †Contact author: partha_chowdhury@uml.edu
  • ‡Deceased.
  • §Present address: Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
  • ∥Present address: National Nuclear Data Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
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Phys. Rev. C 111, 034320 – Published 13 March, 2025

DOI: https://doi.org/10.1103/PhysRevC.111.034320

Abstract

We report on a new spectroscopic study of the decay of high-K isomers in No152102254, a touchstone nucleus for testing models to understand the structure of superheavy nuclei. The experiment, performed using the Argonne gas-filled analyzer (AGFA), was geared toward resolving long-standing ambiguities in spin-parity and configuration assignments for the two- and four-quasiparticle (qp) intrinsic excitations identified in this nucleus. The isomer decay schemes are firmly established with the help of the highest-statistics γ−γ coincidence data collected to date, providing anchor points for competing theories. A newly measured half-life in the nanosecond range establishes a second 2-qp isomer in No254. The preferred decay pathways for the 2- and 4-qp isomers are discussed, providing new insights into the underlying hindrance mechanisms at play in these heavy nuclei. With firm configuration assignments, the intrinsic excitations in this deformed mass region provide stringent constraints and challenge the different theoretical approaches at play in understanding the structure of superheavy nuclei.

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Outline

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Phys. Rev. C 111, 034320– Published 13 March, 2025
  • Received 13 October 2024
  • Revised 20 January 2025
  • Accepted 26 February 2025
Article part of CHORUS
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