1. The shape of the Tz = +1 nucleus 94Pd and the role of proton-neutron interactions on the structure of its excited states.
- Author
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Yaneva, A., Jazrawi, S., Mikołajczuk, M., Górska, M., Regan, P.H., Das, B., Albers, H.M., Alhomaidhi, S., Arici, T., Banerjee, A., Benzoni, G., Cederwall, B., Chishti, M.M.R., Dao, D.D., Davinson, T., Gargano, A., Gerl, J., Hall, O., Hubbard, N., and Jolie, J.
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NEUTRON-proton interactions , *EXCITED states , *COINCIDENCE , *PROBABILITY theory , *CENTROID - Abstract
Reduced transition probabilities have been extracted between excited, yrast states in the N = Z + 2 nucleus 94Pd. The transitions of interest were observed following decays of the I π = 14 + , E x = 2129 -keV isomeric state, which was populated following the projectile fragmentation of a 124Xe primary beam at the GSI Helmholtzzentrum für Schwerionenforschung accelerator facility as part of FAIR Phase-0. Experimental information regarding the reduced E2 transition strengths for the decays of the yrast 8 + and 6 + states was determined following isomer-delayed E γ 1 − E γ 2 − △ T 2 , 1 coincidence method, using the LaBr 3 (Ce)-based FATIMA fast-timing coincidence gamma-ray array, which allowed direct determination of lifetimes of states in 94Pd using the Generalized Centroid Difference (GCD) method. The experimental value for the half-life of the yrast 8+ state of 755(106) ps results in a reduced transition probability of B(E2:8 → + 6+) = 205 − 25 + 34 e2 fm4, which enables a precise verification of shell-model calculations for this unique system, lying directly between the N = Z line and the N = 50 neutron shell closure. The determined B (E 2) value provides an insight into the purity of (g 9 / 2) n configurations in competition with admixtures from excitations between the (lower) N = 3 p f and (higher) N = 4 g d s orbitals for the first time. The results indicate weak collectivity expected for near-zero quadrupole deformation and an increasing importance of the T = 0 proton-neutron interaction at N = 48. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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