α-cluster structure in even-even nuclei around Mo94

M. A. Souza and H. Miyake
Phys. Rev. C 91, 034320 – Published 19 March 2015

Abstract

[Background] The α-cluster model was successful for describing spectroscopic properties of light nuclei near the shell closures. Evidences of the α-cluster structure in Mo94 were shown, motivating the search for the same structure in other intermediate mass nuclei. [Purpose] The systematic analysis of the α-cluster structure in Mo94 and four even-even neighboring nuclei. [Method] The α-cluster model with the local potential approach. [Results] A good general description of the experimental ground state bands is obtained with only one variable parameter. It is shown that the employed α+core potential is weakly dependent on the angular momentum L and such dependence may be described satisfactorily by a simple L-dependent factor for the five nuclei. The radial parameter of the α+core potential reveals a linear trend in relation to the total nuclear radius and the sum of the α-cluster and core radii. The calculated B(E2) transition rates reproduce correctly the order of magnitude of almost all experimental data without the use of effective charges. The rms intercluster separations and reduced α widths obtained for the ground state bands point to a reduction of the α-cluster intensity with the increasing spin. Negative parity bands are calculated and compared to available experimental levels. The volume integral per nucleon pair and rms radii were calculated for the studied α+core potentials, revealing a similarity with the real parts of the optical potentials used to describe the α+90Zr and α+92Mo elastic scattering at several energies. [Conclusions] This work strongly indicates the presence of similar α+core structures for the N=52 even-even nuclei of the Mo region.

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  • Received 2 August 2014
  • Revised 26 January 2015

DOI:https://doi.org/10.1103/PhysRevC.91.034320

©2015 American Physical Society

Authors & Affiliations

M. A. Souza1,2,* and H. Miyake1,†

  • 1Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R, 187, CEP 05508-090, Cidade Universitária, São Paulo - SP, Brazil
  • 2Instituto Federal de Educação, Ciência e Tecnologia de São Paulo - Campus São Paulo, Rua Pedro Vicente, 625, CEP 01109-010, Canindé, São Paulo - SP, Brazil

  • *marsouza@if.usp.br
  • miyake@if.usp.br

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Vol. 91, Iss. 3 — March 2015

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