Detailed spectroscopy of ${}^{46}$Ca: A study of the ${\beta }^{-}$ decay of ${}^{46}$K

Abstract

We report on high-statistics data from the ${\beta }^{-}$ decay of the ${}^{46}$K $J^{\pi }$ = 2${}^{-}$ ground state taken with the GRIFFIN spectrometer located at the TRIUMF-ISAC facility. In total, 199 $\gamma$ rays and 42 excited states were placed in the level scheme, and from the observed $\beta$ feeding and angular correlations of pairs of cascading $\gamma$ rays, it was possible to assign spins and parities to excited states and determine mixing ratios for selected $\gamma$ rays. The level structure of ${}^{46}$Ca is compared to theoretical predictions from a microscopic valence-space Hamiltonian derived from two- (NN) and three-nucleon (3N) forces. These calculations are in reasonable agreement with the experimental data and indicate that the protons in this region are not as inert as would be expected for semi-magic nuclei.

References in corpus (11)

• Chiral effective field theory and nuclear forces
• Improved nuclear matter calculations from chiral low-momentum interactions
• Similarity Renormalization Group for Nucleon-Nucleon Interactions
• A nucleus-dependent valence-space approach to nuclear structure
• In-Medium Similarity Renormalization Group for Open-Shell Nuclei
• Ab Initio Multi-Reference In-Medium Similarity Renormalization Group Calculations of Even Calcium and Nickel Isotopes
• Three-nucleon forces and spectroscopy of neutron-rich calcium isotopes
• Ground-State Electromagnetic Moments of Calcium Isotopes
• N=90 region: The decays of {152m,g}Eu to 152Sm
• The GRIFFIN Data Acquisition System
• Half-lives of neutron-rich ${}^{128-130}$Cd

Cited by in corpus (2)

• Structure of ${}^{46,47}$Ca from the ${\beta }^{-}$ decay of ${}^{46,47}$K in the framework of nuclear shell model
• $\beta$ Decay of ${}^{132}$In and Spectroscopy of ${}^{132}$Sn and ${}^{131}$Sb with the GRIFFIN Spectrometer