@misc{10481/85511,
year = {2023},
month = {9},
url = {https://hdl.handle.net/10481/85511},
abstract = {Background: Even-even isotopes of Mo (Z = 42) and Ru (Z = 44) are nuclei close to the subshell closure at
Z = 40, where shape coexistence plays a significant role. As a result, their spectroscopic properties are expected
to resemble those of Sr (Z = 38) and Zr (Z = 40). Exploring the evolution of these properties as they move away
from the subshell closure is of great interest.
Purpose: The purpose of this study is to reproduce the spectroscopic properties of even-even 96–110
42Mo and
98–114
44Ru isotopes and to determine the influence of shape coexistence.
Method: We employed the interacting boson model with configuration mixing as the framework to calculate
all the observables for Mo and Ru isotopes. We considered two types of configurations: 0-particle–0-hole and
2-particle–2-hole excitations. The model parameters were determined using a least-squares fitting to match the
excitation energies and the B(E2) transition rates.
Results: We obtained the excitation energies, B(E2) values, two-neutron separation energies, nuclear radii, and
isotope shifts for the entire chain of isotopes. Our theoretical results show good agreement with experimental
data. Furthermore, we conducted a detailed analysis of the wave functions and obtained the mean-field energy
surfaces and the nuclear deformation parameter, β, for all considered isotopes.
Conclusions: Our findings reveal that shape coexistence plays a significant role inMo isotopes, with the crossing
of intruder and regular configurations occurring at neutron number 60 (A = 102), which induces a quantum phase
transition. In contrast, in Ru isotopes, the intruder states have minimal influence, remaining at higher energies.
However, at neutron number 60, also a quantum phase transition occurs in Ru isotopes.},
organization = {Consejería de Economía, Conocimiento,
Empresas y Universidad de la Junta de Andalucía (Spain)
under Groups FQM-160},
organization = {FQM-370},
organization = {No. P20-00617},
organization = {No. P20-01247},
organization = {No. US-1380840},
organization = {Projects No. PID2019-104002GB-C21},
organization = {No.
PID2019-104002GB-C22},
organization = {No. PID2020-114687GB-I00},
organization = {No.
PID2022-136228NB-C21},
organization = {No. PID2022-136228NB-C22},
organization = {MCIN/AEI/10.13039/50110001103},
organization = {ERDF
A way of making Europe},
organization = {CEAFMC and the Universidad de
Huelva High Performance Computer (HPC@UHU)},
organization = {ERDF/MINECO Project No. UNHU-15CE-2848},
publisher = {E. Maya-Barbecho, S. Baid, J. M. Arias, and J. E. García-Ramos Phys. Rev. C 108, 034316},
title = {At the borderline of shape coexistence: Mo and Ru},
doi = {10.1103/PhysRevC.108.03431},
author = {Maya Barbecho, Esperanza and Baid, S. and Arias Peñalver, José María and García Ramos, José Enrique},
}