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

Summary, in English

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.

• Author: G. Zhang; A. Zyriliou; D. Cox; Y. Hrabar; L. G. Sarmiento
• Department/s: Department of Physics; Particle and nuclear physics
• Publishing year: 2025-04
• Language: English
• Publication/Series: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
• Volume: 863
• Links: http://dx.doi.org/10.1016/j.physletb.2025.139378
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics
• Keywords: Gamma-ray spectroscopy; Lifetime measurement; Nuclear structure; Radioactive beams
• Status: Published
• ISBN/ISSN/Other: ISSN: 0370-2693