The anomalous quadrupole collectivity in Te isotopes

Abstract

We present systematic calculations on the spectroscopy and transition properties of even-even Te isotopes by using the large-scale configuration interaction shell model approach with a realistic interaction. These nuclei are of particular interest since their yrast spectra show a vibrational-like equally-spaced pattern but the few known E2 transitions show anomalous rotational-like behavior, which cannot be reproduced by collective models. Our calculations reproduce well the equally-spaced spectra of those isotopes as well as the constant behavior of the $B(E2)$ values in ${}^{114}$Te. The calculated $B(E2)$ values for neutron-deficient and heavier Te isotopes show contrasting different behaviors along the yrast line. The $B(E2)$ of light isotopes can exhibit a nearly constant bevavior upto high spins. We show that this is related to the enhanced neutron-proton correlation when approaching $N=50$.

7 pages, 4 figures, submitted to PRC

References in corpus (7)

• Overview of Neutron-Proton Pairing
• Evidence for a spin-aligned neutron-proton paired phase from the level structure of ${}^{92}$Pd
• Orbital dependent nucleonic pairing in the lightest known isotopes of tin
• A monopole-optimized effective interaction for tin isotopes
• Collectivity in the light Xenon isotopes: A shell model study
• Shell-model study of quadrupole collectivity in light tin isotopes
• Ratio B(E2, 4\rightarrow2)/B(E2, 2\rightarrow 0) in Even-Even Nuclei:Apparent Anomalous Behavior of the Chromium Isotopes