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 95 Mo( n th , γ ) and 143 Nd( n th , 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 J π = 3 − 1 state, the octupole phonon. Furthermore, for 144 Nd 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 144 Nd remains a good candidate for an isovector state, a simple model approach indicates that for 96 Mo the isovector state must be higher in energy than the proposed 3 − 2 candidate at 3178 keV.
Authors
- P. Mutti (ORCID: https://orcid.org/0000-0002-2078-8726)
- K. O. Zell
- R. Chapman (ORCID: https://orcid.org/0000-0001-9338-9905)
- E. Gregor (ORCID: https://orcid.org/0000-0003-2470-9527)
- J. R. Vanhoy (ORCID: https://orcid.org/0000-0002-5700-2563)
- W. Urban (ORCID: https://orcid.org/0000-0003-0002-7636)
- Aurélien Blanc (ORCID: https://orcid.org/0000-0003-4240-3281)
- F. Drouet
- G. de France (ORCID: https://orcid.org/0000-0002-7439-1759)
- D. O’Donnell (ORCID: https://orcid.org/0000-0002-4710-3803)
- V. Werner (ORCID: https://orcid.org/0000-0003-4001-0150)
- M. Scheck (ORCID: https://orcid.org/0000-0002-9624-3909)
- C. Bernards
- M. Jentschel (ORCID: https://orcid.org/0000-0001-8932-4682)
- J. Jolie (ORCID: https://orcid.org/0000-0003-4617-3786)
- U. Köster (ORCID: https://orcid.org/0000-0001-5701-3249)
- Ch. Stoyanov (ORCID: https://orcid.org/0000-0003-0835-9432)
- C. M. Petrache (ORCID: https://orcid.org/0000-0001-8419-1390)
- G. S. Simpson
- M. Thürauf
- Th. Kröll
- A. Vancaeyenest
Institutions
- Centre National de la Recherche Scientifique (FR)
- Université Joseph Fourier (FR)
- University of Cologne (DE)
- United States Naval Academy (US)
- Bulgarian Academy of Sciences (BG)
- Université Paris-Saclay (FR)
- Technische Universität Darmstadt (DE)
- Yale University (US)
- Institut Laue-Langevin (FR)
- Institute for Nuclear Research and Nuclear Energy (BG)
- Scottish Universities Physics Alliance (GB)
- Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR)
- Grand Accélérateur National d'Ions Lourds (FR)
- University of Warsaw (PL)
- University of the West of Scotland (GB)
- Université Grenoble Alpes (FR)
Publication Details
- Journal
- EPJ Web of Conferences
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1051/epjconf/202532901001
- Primary Topic
- Nuclear physics research studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00