Excited levels in the multishaped Pd117 nucleus studied via β decay of Rh117

Abstract

Monoisotopic samples of exotic, neutron-rich 117 Rh nuclei, produced in the proton-induced fission of 238 U and separated using the IGISOL mass separator coupled to the JYFLTRAP Penning trap, were used to perform β and γ coincidence spectroscopy of 117 Pd. The spin parity of the ground state of 117 Pd was determined to be 1/2 + and the 19.1 ms isomer at 203.2 keV was assigned a spin-parity 7/2 − . The 117 Rh β − -decay scheme was considerably extended, and various sequences of the levels were interpreted as resulting from the prolate, oblate, and triaxial nuclear shapes. Some of the β − decays were considered as the allowed Gamow-Teller transitions. The experimental distribution of Gamow-Teller strength is discussed.

β -decay rates of Rh115,117 into Pd115Ferretti1, Kotila2, Vsevolodovna3 et al. 2020Phys. Rev. C11021View full textAdd to dashboardCite

“…ν , c (2) ν , and c (4) ν . They are fitted to reproduce the energy levels of the even-even core nucleus [23,29,44].…”

“…II B, and then to diagonalize the IBFM-2 Hamiltonian. By fitting the IBFM-2 model parameters to reproduce the most recent experimental data for the 115,117 Pd spectra [23,29], one obtains both the IBFM-2 predictions for the 115,117 Pd energy levels and their wave functions. Our results, calculated via the IBFM-2 Hamiltonian of Eq.…”

“…A large amount of experimental data on β decays has been collected during the years; for example, see Refs. [20][21][22][23][24][25][26][27][28][29]. Here, the attention is focused on the experimental results for 115 Rh and 117 Rh isotopes decaying into 115 Pd and 117 Pd [20,21,23,29].…”

“…[20][21][22][23][24][25][26][27][28][29]. Here, the attention is focused on the experimental results for 115 Rh and 117 Rh isotopes decaying into 115 Pd and 117 Pd [20,21,23,29]. The experimental study of these nuclei was motivated by the longstanding prediction of a shape change from prolate to oblate deformation expected in this region [30,31], which is still a rare phenomenon in nuclei.…”

Recent experiments at the JYFLTRAP Penning trap

“…Since the last LASER meeting held in May 2016 in Poznan, several trap-assisted spectroscopy studies employing JYFLTRAP have been published. A beta detector and an array of broad-energy range germanium detectors have been used to study the beta decays of 88 Se [64] and 117 Rh [65]. The TASISpec silicon detector array together with a cluster and clover detectors were employed to study beta decay of 127 Cd [66].…”