Candidates for low-lying octupole isovector (mixed-symmetry) excitations
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 t...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2025-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2025/14/epjconf_cgs17_01001.pdf |
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| Summary: | 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. |
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| ISSN: | 2100-014X |