Nuclear Data Sheets for

Isospin Mixing RevealsP30(p,γ)S<

“…30 P(p, γ) 31 S competes with the beta decay of 30 P to 30 Si (T 1/2 = 2.5 min), thereby affecting the final abundance ratio 30 Si / 28 Si and the interpretation of the origins of candidate presolar nova grains based on that ratio [2]. If the 30 P(p, γ) 31 S reaction rate were known, it could also be used to calibrate so-called nova thermometers [11], relationships between model peak temperatures in ONe novae and corresponding simulated elemental abundances that may be compared to abundance observations.…”

“…If the 30 P(p, γ) 31 S reaction rate were known, it could also be used to calibrate so-called nova thermometers [11], relationships between model peak temperatures in ONe novae and corresponding simulated elemental abundances that may be compared to abundance observations. Since sufficiently intense radioactive 30 [26,27].…”

“…Although it is believed that most of the relevant levels have been populated experimentally [28,29], the spin and parity assignments for most of these levels are uncertain and, in many cases, discrepant [19,25,29,30]. For each of these resonances, spin and parity are needed to determine the resonance strength, which in turn determines the rate of proton capture to that resonance.…”

“…Conveniently, the strong population of this resonance in the beta decay of 31 Cl enables measurements of the proton branching ratio, which would yield an experimental value for the resonance strength when combined with measurements of the lifetime. The relatively large resonance strength may also make this resonance accessible by direct measurements with 30 P beams in the future.…”

Toward concordance of $E_{x}$ and $J^{\pi}$ values for proton unbound 31S states

“…These two levels have been observed at excitation energies of 6255.3(5) and 6280.2(3) keV (statistical uncertainties only) in a recent 31 Cl β-delayed γ decay experiment [16,24]. When the data from Doherty et al [17,23] are used for calibration of the 31 P( 3 He,t) 31 S spectra, significantly different values of 6258.4(8), 6283.7(5) keV and 6259.4(7), 6283.7(4) keV are obtained at 1.0 and 1.5 degrees, respectively.…”