Beta-delayed proton emission in the 100Sn region

TL;DR

This study measured beta-delayed proton emission probabilities in nuclei near 100Sn, providing new data on decay modes and their implications for astrophysical processes like X-ray bursts.

Contribution

The paper reports the first measurements of proton emission branching ratios for several isotopes near 100Sn, improving understanding of nuclear decay properties in this region.

Findings

Identified new beta-delayed proton emitters 96Cd, 98In, 99In.

Measured proton emission branching ratios for multiple isotopes, some for the first time.

Refined the proton emission probability for 101Sn with higher precision.

Abstract

Beta-delayed proton emission from nuclides in the neighborhood of 100Sn was studied at the National Superconducting Cyclotron Laboratory. The nuclei were produced by fragmentation of a 120 MeV/nucleon 112Sn 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 (BCS) in conjunction with the Segmented Germanium Array (SeGA). The nuclei 96Cd, 98Ing, 98Inm and 99In were identified as beta-delayed proton emitters, with branching ratios bp = 5.5(40)%, 5.5+3 -2%, 19(2)% and 0.9(4)%, respectively. The bp for 89Ru, 91,92Rh, 93Pd and 95Ag were deduced for the first time with bp = 3+1.9 -1.7%, 1.3(5)%, 1.9(1)%, 7.5(5)% and 2.5(3)%, respectively. The bp = 22(1)% for 101Sn was deduced with higher precision than previously reported. The impact of the newly measured bp values on the composition of the type-I X-ray burst ashes was studied.