Experimental study of $^{53}$Cr via the $(d,p\gamma)$ reaction

TL;DR

This study investigates the excited states of $^{53}$Cr using the $(d,p ightarrow ext{reaction}$, combining gamma-ray measurements and angular correlations to refine energy levels, spin-parity assignments, and single-particle strength fragmentation.

Contribution

The paper provides new gamma-ray decay data, reassigns excitation energies, and offers a detailed reanalysis of neutron single-particle strength fragmentation in $^{53}$Cr.

Findings

Supported previous spin-parity assignments.

Corrected excitation energies of certain states.

Reassessed neutron single-particle strength fragmentation.

Abstract

Excited states in $^{53}$Cr were studied via the $^{52}$Cr$(d,p\gamma)$ reaction up to the neutron-separation threshold. Proton-$\gamma$ angular correlations and $\gamma$ decay branching ratios were measured in particle-$\gamma$ coincidences between the Super-Enge Split-Pole Spectrograph (SE-SPS) and CeBr$_3$ Array (CeBrA) demonstrator of the John D. Fox Accelerator Laboratory at Florida State University. Previous spin-parity assignments from a $(d,p)$ singles experiment at the SE-SPS are supported and $\gamma$-ray transitions in $^{53}$Cr reported. We firmly assign higher-lying excited states to $^{53}$Cr because overlapping excited states and contaminants could be identified better due to the complementary $\gamma$-decay information. We also correct some of the previously reported excitation energies and present a reanalysis of previously measured $^{52}$Cr$(d,p){}^{53}${Cr} angular distributions guided by the complementary $\gamma$-ray information. Based on this reanalysis, the fragmentation of the neutron $2p_{3/2}$, $2p_{1/2}$, $1f_{5/2}$, $1g_{9/2}$, and $2d_{5/2}$ single-particle strengths is reassessed for $^{53}$Cr. A comparison to the corresponding strengths in $^{55}$Fe is presented.