Beta decay of the exotic $T_z$ = -2 nuclei ${}^{48}$Fe, ${}^{52}$Ni and ${}^{56}$Zn

Abstract

The results of a study of the beta decays of three proton-rich nuclei with $T_z=\text{-}2$, namely ${}^{48}$Fe, ${}^{52}$Ni and ${}^{56}$Zn, produced in an experiment carried out at GANIL, are reported. In all three cases we have extracted the half-lives and the total $\beta$-delayed proton emission branching ratios. We have measured the individual $\beta$-delayed protons and $\beta$-delayed $\gamma$ rays and the branching ratios of the corresponding levels. Decay schemes have been determined for the three nuclei, and new energy levels are identified in the daughter nuclei. Competition between $\beta$-delayed protons and $\gamma$ rays is observed in the de-excitation of the $T=2$ Isobaric Analogue States in all three cases. Absolute Fermi and Gamow-Teller transition strengths have been determined. The mass excesses of the nuclei under study have been deduced. In addition, we discuss in detail the data analysis taking as a test case ${}^{56}$Zn, where the exotic $\beta$-delayed $\gamma$-proton decay has been observed.

arXiv comment19 pages, 21 figures

References in corpus (4)

• Nuclear weak-interaction processes in stars
• Evaluated Experimental Isobaric Analogue States from $T=1/2$ to $T=3$ and associated IMME coefficients
• Observation of the $\beta$-delayed $\gamma$-proton decay of ${}^{56}$Zn and its impact on the Gamow Teller strength evaluation
• First observation of 55,56Zn

Cited by in corpus (9)

• Isochronous mass measurements of $T_z=-1$ $fp$-shell nuclei from projectile fragmentation of ${}^{58}$Ni
• Identification of the Lowest $T=2$, $J^{\pi =}{0}^{+}$ Isobaric Analog State in ${}^{52}$Co and Its Impact on the Understanding of $\beta$-Decay Properties of ${}^{52}$Ni
• Beta decay of the very neutron-deficient ${}^{60}$Ge and ${}^{62}$Ge nuclei
• High-precision mass measurements for the isobaric multiplet mass equation at A = 52
• Mass measurements for $T_z=-2$ $fp$-shell nuclei ${}^{40}$Ti, ${}^{44}$Cr, ${}^{46}$Mn, ${}^{48}$Fe, ${}^{50}$Co and ${}^{52}$Ni
• Observation of the 2${}^{+}$ isomer in ${}^{52}$Co
• ${}^{57}$Zn $\beta$-delayed proton emission establishes the ${}^{56}$Ni $rp$-process waiting point bypass
• The beta decay of Tz=-2 64Se and its descendants: the T=2 isobaric multiplet
• $\beta$-decay spectroscopy of neutron-deficient nuclei