Year: 2025
Type: conference-paper
Abstract: The spectroscopic properties of low-lying octupole states, previously proposed to be candidates for isovector (mixed-symmetry) states, were investigated in 95Mo(nth, γ) and 143Nd(nth, γ) thermal neutron capture reactions. The experiments used eight Clover detectors that made up the central ring of the EXILL setup and the high thermal neutron flux of the research reactor at ILL. These measurements allowed a determination of branching ratios and multipole mixing ratios for the transitions of interest connecting the isovector candidate and the lowest-lying Jπ = 3−1 state, the octupole phonon. Furthermore, for 144Nd the lifetime of the third excited 3−3 level was remeasured using the Gamma-Ray Induced Doppler-shift method to be τ = 31+10−25. While calculations in the Quasi-particle Phonon Model indicate that the 3−3 state in 144Nd remains a good candidate for an isovector state, a simple model approach indicates that for 96Mo the isovector state must be higher in energy than the proposed 3−2 candidate at 3178 keV.
Source: EPJ Web of Conferences
Institutions: Scottish Universities Physics Alliance, University of the West of Scotland, Technische Universität Darmstadt, Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy, Yale University, Institut Laue-Langevin, Université Joseph Fourier, Laboratoire de Physique Subatomique et de Cosmologie, Grand Accélérateur National d'Ions Lourds, University of Cologne, Centre National de la Recherche Scientifique, Université Paris-Saclay, Institut National de Physique Nucléaire et de Physique des Particules, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie, University of Warsaw, United States Naval Academy
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4411655546