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Approaching 100Sn : Structural evolution in 98,100Cd via lifetime measurements

Zhang, G. ; Zyriliou, A. ; Cox, D. LU ; Hrabar, Y. LU orcid and Sarmiento, L. G. LU orcid (2025) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 863.
Abstract

The lifetimes of low-lying excited states below the 8+ seniority isomer were directly measured using fast timing detectors in the neutron-deficient isotopes 98,100Cd. This experiment was conducted with the DEcay SPECtroscopy (DESPEC) setup at GSI, where the ions of interest were produced via a fragmentation reaction and identified using the FRagment Separator (FRS) before being implanted in the AIDA active stopper system, and the γ rays emitted during the de-excitation of isomeric states were detected by the LaBr3 FATIMA Array. The newly deduced values for the reduced transition probabilities were compared with shell-model calculations using different interactions and effective charges. The results... (More)

The lifetimes of low-lying excited states below the 8+ seniority isomer were directly measured using fast timing detectors in the neutron-deficient isotopes 98,100Cd. This experiment was conducted with the DEcay SPECtroscopy (DESPEC) setup at GSI, where the ions of interest were produced via a fragmentation reaction and identified using the FRagment Separator (FRS) before being implanted in the AIDA active stopper system, and the γ rays emitted during the de-excitation of isomeric states were detected by the LaBr3 FATIMA Array. The newly deduced values for the reduced transition probabilities were compared with shell-model calculations using different interactions and effective charges. The results indicate that, while 98Cd aligns well with a seniority scheme description, in 100Cd the transition strengths among low-lying states are not fully reproduced, and the nature of these states remains an open problem within the present theoretical description. Ultimately, a key element in the description of this region, crucial for nuclear physics and astrophysics, appears to be the proton-neutron term of the nuclear effective interaction.

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author
; ; ; and
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Gamma-ray spectroscopy, Lifetime measurement, Nuclear structure, Radioactive beams
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
863
article number
139378
publisher
Elsevier
external identifiers
  • scopus:86000508900
ISSN
0370-2693
DOI
10.1016/j.physletb.2025.139378
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2025 The Author(s)
id
59dafbea-25ca-4732-9ce6-0a4ff4fa7567
date added to LUP
2025-10-07 14:05:40
date last changed
2025-10-14 11:50:37
@article{59dafbea-25ca-4732-9ce6-0a4ff4fa7567,
  abstract     = {{<p>The lifetimes of low-lying excited states below the 8<sup>+</sup> seniority isomer were directly measured using fast timing detectors in the neutron-deficient isotopes <sup>98,100</sup>Cd. This experiment was conducted with the DEcay SPECtroscopy (DESPEC) setup at GSI, where the ions of interest were produced via a fragmentation reaction and identified using the FRagment Separator (FRS) before being implanted in the AIDA active stopper system, and the γ rays emitted during the de-excitation of isomeric states were detected by the LaBr<sub>3</sub> FATIMA Array. The newly deduced values for the reduced transition probabilities were compared with shell-model calculations using different interactions and effective charges. The results indicate that, while <sup>98</sup>Cd aligns well with a seniority scheme description, in <sup>100</sup>Cd the transition strengths among low-lying states are not fully reproduced, and the nature of these states remains an open problem within the present theoretical description. Ultimately, a key element in the description of this region, crucial for nuclear physics and astrophysics, appears to be the proton-neutron term of the nuclear effective interaction.</p>}},
  author       = {{Zhang, G. and Zyriliou, A. and Cox, D. and Hrabar, Y. and Sarmiento, L. G.}},
  issn         = {{0370-2693}},
  keywords     = {{Gamma-ray spectroscopy; Lifetime measurement; Nuclear structure; Radioactive beams}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics}},
  title        = {{Approaching <sup>100</sup>Sn : Structural evolution in <sup>98,100</sup>Cd via lifetime measurements}},
  url          = {{http://dx.doi.org/10.1016/j.physletb.2025.139378}},
  doi          = {{10.1016/j.physletb.2025.139378}},
  volume       = {{863}},
  year         = {{2025}},
}