Spectroscopic study of ${}^{47}$Ca from the ${\beta }^{-}$ decay of ${}^{47}$K

Abstract

The ${\beta }^{-}$ decay of ${}^{47}$K to ${}^{47}$Ca is an appropriate mechanism for benchmarking interactions spanning the $sd$ and $pf$ shells, but current knowledge of the ${\beta }^{-}$-decay scheme is limited. We have performed a high-resolution, high-efficiency study of the ${\beta }^{-}$-decay of ${}^{47}$K with the GRIFFIN spectrometer at TRIUMF-ISAC. The study revealed 48 new transitions, a more precise value for the ${}^{47}$K half-life (17.38(3)~s), and new spin and parity assignments for eight excited states. Levels placed for the first time here raise the highest state observed in ${\beta }^{-}$ decay to within 568(3) keV of the $Q$-value and confirm the previously measured large ${\beta }^{-}$-decay branching ratios to the low-lying states. Previously unobserved ${\beta }^{-}$-feeding to 3/2${}^{+}$ states between 4.5 and 6.1~MeV excitation energy was identified with a total ${\beta }^{-}$-feeding intensity of 1.29(2)\%. The sum of the $B(GT)$ values for these states indicates that the $1s_{1/2}$ proton hole strength near this excitation energy is comparable to the previously known $1s_{1/2}$ proton and neutron hole strengths near 2.6 MeV.

References in corpus (13)

• Discrepancy between experimental and theoretical $\beta$-decay rates resolved from first principles
• A nucleus-dependent valence-space approach to nuclear structure
• Evolution of shell structure in neutron-rich calcium isotopes
• Structure of the lightest tin isotopes
• In-Medium Similarity Renormalization Group with Chiral Two- Plus Three-Nucleon Interactions
• Leading chiral three-nucleon forces along isotope chains in the calcium region
• Three-body forces and shell structure in calcium isotopes
• Structure of ${}^{78}$Ni from first principles computations
• Three-nucleon forces and spectroscopy of neutron-rich calcium isotopes
• Open $sd$-shell nuclei from first principles
• The GRIFFIN Facility for Decay-Spectroscopy Studies at TRIUMF-ISAC
• The GRIFFIN Data Acquisition System
• Gamma-gamma angular correlation analysis techniques with the GRIFFIN spectrometer

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
• Analog-antianalog isospin mixing in ${}^{47}$K ${\beta }^{-}$ decay