Extension of the T(z)= -3/2, A = 4n + 1 series of beta-delayed proton emitters to selenium-65 and strontium-73, and low energy beta-delayed proton emission from the T(z) = -3/2, A = 4n + 3 nucleus aluminum-23

The series of known Tz = {dollar}-{dollar}3/2, A = 4n + 1 nuclei has been extended to include the previously undiscovered isotopes {dollar}sp{lcub}65{rcub}{dollar}Se and {dollar}sp{lcub}73{rcub}{dollar}Sr, through the observation of beta-delayed proton emission via the isobaric analog state (IAS) of the beta-daughter (emitter). Due to the relatively large proton energies involved, these experiments were conducted using standard Si-Si {dollar}Delta{dollar}E-E telescopes. Beta-delayed protons arising from {dollar}sp{lcub}65{rcub}{dollar}Se have been observed at an energy (laboratory) of 3.55 {dollar}pm{dollar} 0.03 MeV, corresponding to the decay of the T = 3/2 isobaric analog state in {dollar}sp{lcub}65{rcub}{dollar}As to the ground state of {dollar}sp{lcub}64{rcub}{dollar}Ge. Similarly, beta-delayed protons from {dollar}sp{lcub}73{rcub}{dollar}Sr at an energy of 3.75 {dollar}pm{dollar} 0.04 MeV have been observed, corresponding to decay of the T = 3/2 isobaric analog state in {dollar}sp{lcub}73{rcub}{dollar}Rb to the ground state of {dollar}sp{lcub}72{rcub}{dollar}Kr. From the energies of these proton transitions, an improved prediction of the mass excesses of the two parent nuclei ({dollar}sp{lcub}65{rcub}{dollar}Se and {dollar}sp{lcub}73{rcub}{dollar}Sr) is made through the use of a Coulomb displacement formula. These predictions are {dollar}-33.41pm 0.26{dollar} and {dollar}-31.87pm 0.24{dollar} MeV for {dollar}sp{lcub}65{rcub}{dollar}Se and {dollar}sp{lcub}73{rcub}{dollar}Sr, respectively.; Studies of low energy (down to {dollar}sim{dollar}200 keV) beta-delayed protons from {dollar}sp{lcub}23{rcub}{dollar}Al necessitated that a particle identification telescope with a low energy threshold for observation and identification of protons be developed. {dollar}sp{lcub}23{rcub}{dollar}Al is of interest because of its role in the breakout of the hot CNO cycle leading to the astrophysical rp process. This was accomplished through the use of two gas proportional counters as the {dollar}Delta{dollar}E detectors followed by a Si E detector. Using an array of these low-energy proton telescopes (covering 24% of 4{dollar}pi{dollar}), beta-delayed proton emission (219 {dollar}pm{dollar} 20 keV) from the IAS of {dollar}sp{lcub}23{rcub}{dollar}Al in {dollar}sp{lcub}23{rcub}{dollar}Mg has been observed for the first time with a proton branching ratio of {dollar}sim{dollar}14%. In addition low-energy beta-delayed protons from {dollar}sp{lcub}24{rcub}{dollar}Al have been observed. Previous studies of this nuclide revealed beta-delayed alpha emission. From comparison with these known delayed-alpha transitions, a branching ratio for beta-delayed proton emission has been determined to be {dollar}(7.5pm 0.4)times 10sp{lcub}-6{rcub}.{dollar}...