BETA-DELAYED PROTON RADIOACTIVITY OF CR-44, MN-47, FE-48,FE-49 AND CO-50

The proton-rich nuclei Cr-44, Mn-47, Fe-48,Fe-49 and Co-50 have been p roduced by fragmentation of a Ni-58 beam at 650 MeV/u. The isotopic se paration of these nuclei has been achieved with the GSI Projectile-Fra gment Separator FRS. The isotopes have been identified in flight by De lta E-ToF-B rho measurements. After implantation in a stack of seven s ilicon detectors, the signals measured for implantation and radioactiv e decay were unambiguously correlated in time due to low counting rate s. On the basis of the two proton peaks observed for Co-50 at (2034+/- 30) keV and (2740+/-41) keV with a half-life of (44+/-4) ms, a partial decay scheme is proposed for this nucleus. A single proton peak at (9 59+/-33) keV was observed for Fe-48 with a half-life of (44+/-7) ms. T his emission is attributed to the decay of the T = 2 isobaric analog s tate in Mn-48. No deviation from the quadratic form of the isobaric mu ltiplet mass equation is observed. Additional information on beta-dela yed proton branches of Fe-49, Cr-44 and Mn-47 was also obtained.