Article
At the Borderline of Shape Coexistence: Mo and Ru
Author/s | Maya Barbecho, E.
Baid, S. Arias Carrasco, José Miguel García Ramos, J. E. |
Department | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Publication Date | 2023 |
Deposit Date | 2024-01-09 |
Published in |
|
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 ... 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 Mo961-4296-110 and Ru961-4498-114 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 in Mo 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. |
Funding agencies | Junta de Andalucía Ministerio de Ciencia e Innovación (MICIN). España Ministerio de Economía y Competitividad (MINECO). España |
Project ID. | P20-00617
P20-01247 US-1380840 PID2019-104002GB-C21 PID2019-104002GB-C22 PID2020-114687GB-I00 PID2022-136228NB-C21 PID2022-136228NB-C22 UNHU-15CE-2848 |
Citation | Maya Barbecho, E., Baid, S., Arias Carrasco, J.M. y García Ramos, J.E. (2023). At the Borderline of Shape Coexistence: Mo and Ru. Physical Review C, 108 (3), 034316. https://doi.org/10.1103/PhysRevC.108.034316. |
Files | Size | Format | View | Description |
---|---|---|---|---|
At the borderline of shape.pdf | 2.050Mb | [PDF] | View/ | |
This item appears in the following collection(s)
This document is protected by intellectual and industrial property rights. Without prejudice to existing legal exemptions, its reproduction, distribution, public communication or transformation is prohibited without the authorization of the rights holder, unless otherwise indicated.