Effects of proton angular momentum alignment on the two-shears-like mechanism in $^{101}$Pd

TL;DR

This study investigates the antimagnetic rotation band in $^{101}$Pd using a cranked shell model with pairing correlations, revealing the role of proton angular momentum alignment in the two-shears-like mechanism.

Contribution

It introduces a particle-number conserving method to analyze the effects of proton angular momentum alignment on the two-shears-like mechanism in $^{101}$Pd.

Findings

Reproduces experimental moments of inertia and $B(E2)$ transition probabilities.

Clarifies the upbending mechanism of $ u h_{11/2}$ in $^{101}$Pd.

Discusses the influence of proton angular momentum alignment on the two-shears-like mechanism.

Abstract

The recently observed possible antimagnetic rotation band in $^{101}$Pd is investigated by the cranked shell model with pairing correlations treated by a particle-number conserving method, in which the blocking effects are taken into account exactly. The experimental moments of inertia and reduced $B(E2)$ transition probabilities and their variations with the rotational frequency $\omega$ are well reproduced. By analyzing the $\omega$-dependence of the occupation probability of each cranked Nilsson orbital near the Fermi surface and the contributions of valence orbitals in each major shell to the total angular momentum alignment, the upbending mechanism of $\nu h_{11/2}$ in $^{101}$Pd is understood clearly. The proton angular momentum alignment and its influence on the two-shears-like mechanism are also discussed.