Constraining the P30(p,γ)S31 Reaction Rate in ONe Novae via the Weak, Low-Energy, β -Delayed Proton Decay of Cl31 Academic Article uri icon

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  • The ^{30}P(p,γ)^{31}S reaction plays an important role in understanding the nucleosynthesis of A≥30 nuclides in oxygen-neon novae. The Gaseous Detector with Germanium Tagging was used to measure ^{31}Cl β-delayed proton decay through the key J^{π}=3/2^{+}, 260-keV resonance. The intensity I_{βp}^{260}=8.3_{-0.9}^{+1.2}×10^{-6} represents the weakest β-delayed, charged-particle emission ever measured below 400 keV, resulting in a proton branching ratio of Γ_{p}/Γ=2.5_{-0.3}^{+0.4}×10^{-4}. By combining this measurement with shell-model calculations for Γ_{γ} and past work on other resonances, the total ^{30}P(p,γ)^{31}S rate has been determined with reduced uncertainty. The new rate has been used in hydrodynamic simulations to model the composition of nova ejecta, leading to a concrete prediction of ^{30}Si:^{28}Si excesses in presolar nova grains and the calibration of nuclear thermometers.


  • Budner, T
  • Friedman, M
  • Wrede, C
  • Brown, BA
  • José, J
  • Pérez-Loureiro, D
  • Sun, LJ
  • Surbrook, J
  • Ayyad, Y
  • Bardayan, DW
  • Chae, K
  • Chen, Alan
  • Chipps, KA
  • Cortesi, M
  • Glassman, B
  • Hall, MR
  • Janasik, M
  • Liang, J
  • O’Malley, P
  • Pollacco, E
  • Psaltis, A
  • Stomps, J
  • Wheeler, T

publication date

  • May 6, 2022