β-delayed γ-proton decay in 56Zn: analysis of the charged-particle spectrum

A study of the beta decay of the proton-rich T-z = 2 nucleus Zn-56 has been reported in a recent publication. A rare and exotic decay mode, beta-delayed gamma-proton decay, has been observed there for the first time in the fp shell. Here, we expand on some of the details of the data analysis, focussing on the charged particle spectrum

Competition of beta-delayed protons and beta-delayed gamma rays in Zn-56 and the exotic beta-delayed gamma-proton decay

Remarkable results have been published recently on the beta decay of Zn-56. In particular, the rare and exotic beta-delayed gamma-proton emission has been detected for the first time in the fp shell. Here we focus the discussion on this exotic decay mode and on the observed competition between beta-delayed protons and beta-delayed gamma rays from the Isobaric Analogue State

BETA DECAY OF THE EXOTIC T-z =-2, Zn-56 NUCLEUS AND HALF-LIFE OF VARIOUS PROTON-RICH T-z =-1 NUCLEI

Preliminary results of an experimental study of the beta-decay of the exotic T-z = -2, Zn-56 nucleus and other proton-rich T-z = 1 nuclei are presented. The ions were produced at GANIL using fragmentation reactions, separated by the LISE3 spectrometer and implanted in a double-sided silicon strip detector surrounded by Ge detectors. The half-lives of Zn-56 and four T-z= - 1 nuclei in the fp-shell have been measured. While the decay of the Tz = 1 nuclei proceeds essentially by beta-delayed gamma emission, in the case of 56Zn beta-delayed proton emission is also observed. Moreover, the exotic beta-delayed gamma-proton decay is seen for the first time. The information from the decay study has been used to determine the absolute Fermi and Gamow Teller transition strengths. The results for Zn-56 have been compared with the mirror Charge Exchange process, the (He-3,t) reaction on the Tz = +2, Fe-56 target nucleus. This comparison is important for understanding the Zn-56 decay data

Beta decay of the exotic Tz = -1, -2, 56^{56}Zn nucleus and half-life of various proton-rich Tz = -1 nuclei

Expérience GANIL/LISE3/ExogamInternational audiencePreliminary results of an experimental study of the -decay of the exotic Tz = -2, 56Zn nucleus and other proton-rich Tz = -1 nuclei are presented. The ions were produced at GANIL using fragmentation reactions, separated by the LISE3 spectrometer and implanted in a double-sided silicon strip detector surrounded by Ge detectors. The half-lives of 56Zn and four Tz = -1 nuclei in the fp-shell have been measured. While the decay of the Tz = -1 nuclei proceeds essentially by -delayed gamma emission, in the case of 56Zn -delayed proton emission is also observed. Moreover the exotic -delayed gamma-proton decay is seen for the rst time. The information from the decay study has been used to determine the absolute Fermi and Gamow- Teller transition strengths. The results for 56Zn have been compared with the mirror Charge Exchange process, the (3He,t) reaction on the Tz = +2, 56Fe target nucleus. This comparison is important for understanding the 56Zn decay data

Beta decay of exotic T-Z =-1,-2 nuclei: the interesting case of Zn-56

The beta decay properties of the T-z = -2, Zn-56 isotope and other proton-rich nuclei in the fp-shell have been investigated in an experiment performed at GANIL. The ions were produced in fragmentation reactions and implanted in a double-sided silicon strip detector surrounded by Ge EXOGAM clovers. Preliminary results for Zn-56 are presented. The Zn-56 decay proceeds mainly by beta delayed proton emission, but beta delayed gamma rays were also detected. Moreover, the exotic beta delayed gamma-proton decay was observed for the first time. The Zn-56 half-life and the energy levels populated in the Cu-56 daughter have been determined. Knowledge of the gamma de-excitation of the mirror states in Co-56 and the comparison with the results of the mirror charge exchange process, the Fe-56(He-3,t) reaction (where Fe-56 has T-z = +2), were important in the interpretation of the Zn-56 decay data. The absolute Fermi and Gamow-Teller strengths have been deduced

β\beta decay of the exotic TzT_z = -2 nuclei 48^{48}Fe, 52^{52}Ni and 56^{56}Zn

The results of a study of the beta decays of three proton-rich nuclei having $T_z$ = -2, namely $^{48}$Fe, $^{52}$Ni and $^{56}$Zn, produced in an experiment carried out at GANIL, are reported. In all the 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 with their branching ratios. Decay schemes have been determined for the three nuclei, and new energy levels are identified in the corresponding daughter nuclei. Competition between $\beta$-delayed protons and gammas 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