Nuclear Data Sheets for A=190

Spectroscopic Analysis of the Energy-Level Structure in Rhenium-190

“…It is highly likely that this peak is the previously measured E = 119.12 ±0.05 keV, J π = (3) − state. As can be seen in figure 4, the spin/parity configuration that best fit the data is J π = 3 − , in agreement with the current literature assignment for this level [7], with the J π = 4 − assignment also showing good agreement. While this is a promising result, such agreement is not currently observed for the vector analysing power of any of the peaks suggesting an error in the extraction of measured quantities or in the calculation input.…”

“…This will be improved upon before full publication of the energies. Previously observed states [7] have been labelled (due to the large uncertainty in the 204 ± 10 keV state, further work is needed to unambiguously assign a peak to this state).…”

Shapes and structure for the lowest states of the 42,44Ca isotopes

“…Starting from this experimental and theoretical information, discussed above, we found more appropriate to consider for the description of the lowest collective states of 42 Ca [66] and 44 Ca [67], the collective model proposed in [27] and adapted in [31,32] to describe shape coexistence and mixing between an approximately spherical shape and a γ-unstable triaxial one. The model is applied here in the following way.…”

“…For the present study of lowest collective states of the 42,44 Ca isotopes [66,67] are involved, in a complementary way, the Bohr-Mottelson Hamiltonian [26] numerically solved for a sextic oscillator potential [27,30] and the Covariant Density Functional Theory (CDFT) [34][35][36] with the Density-Dependent Meson Exchange Model (DD-ME2) interaction [34,35]. The two models are discussed in the next two subsections.…”

“…Free parameters of the model, v 1 , v 2 and v 3 fitted for the experimental data of42 Ca [66] and44 Ca[67]. The wall position b ˜w is determined by the parameters v 1 and v 2 , while β M is extracted from matching the experimental data for the  The root mean square (rms) corresponds to the fit on the dimensionless energy ratios normalized to the first excited energy of the + 2 1 state.…”