β-Delayed Proton Emission in the 100Sn Region

Abstract

β-delayed proton emission from nuclides in the neighborhood of 100 Sn was studied at the National Superconducting Cyclotron Laboratory (NSCL). The nuclei were produced by fragmentation of a 120 MeV/nucleon 112 Sn primary beam on a Be target. Beam purification was provided by the A1900 Fragment Separator and the Radio Frequency Fragment Separator. The fragments of interest were identified and their decay was studied with the NSCL Beta Counting System in conjunction with the Segmented Germanium Array. The nuclei 96 Cd, 98 In g , 98 Inm , and 99 In were identified as β-delayed proton emitters, with branching ratios bβp = 5.5(40)%, 5.5 +3 −2%, 19(2)%, and 0.9(4)%, respectively. The branching ratios for 89 Ru, 91,92 Rh, 93 Pd, and 95 Ag were deduced for the first time with bβp = 3 +1.9 −1.7%, 1.3(5)%, 1.9(1)%, 7.5(5)%, and 2.5(3)%, respectively. The bβp = 22(1)% value for 101 Sn was deduced with higher precision than previously reported. The impact of the newly measured bβp values on the composition of the type I x-ray burst ashes was studied