Speaker
Description
Sensitivity studies have identified $^{30}$P$(p,\gamma)^{31}$S as crucial for understanding nucleosynthesis of $A\geq 30$ nuclides in oxygen-neon (ONe) novae, affecting the calibration of nuclear thermometers and the identification of the origins of $^{30}$Si-enriched presolar grains. A radioactive beam experiment was performed at the National Superconducting Cyclotron Laboratory to measure the weak, low-energy, $\beta$-delayed proton decay of $^{31}$Cl to constrain the large uncertainties in the thermonuclear rate of this reaction. This was the first dedicated science experiment using the Gaseous Detector with Germanium Tagging (GADGET) system, during which the proton branching ratio of the key $J^{\pi}=3/2^{+}$, 260-keV resonance in $^{31}$S was measured. Here, we present the final results of this measurement. We report the weakest $\beta$-delayed, charged-particle emission ever measured below 400 keV. Using a 1D, fully hydrodynamic simulation, we predict nuclear abundances in classical nova ejecta and compare to astronomical observation.
This work was supported by the National Science Foundation under Grants No. PHY-1913554, No. PHY-1102511, No. PHY-1565546, PHY-2110365, No. PHY-2011890; the Department of Energy Office of Science under Award No. DE-SC0016052; the Natural Sciences and Engineering Research Council of Canada (NSERC); the Spanish MINECO Grant No. AYA2017-86274-P, the E. U. FEDER funds, the AGAUR/Generalitat de Catalunya Grant No. SGR-661/2017, the EU Horizon 2020 Grant No. 101008324 ChETEC-INFRA, the ChETEC COST Action (CA16117); and Korean NRF Grants No. 2020R1A2C1005981 and No. 2016R1A5A1013277.
| Length of presentation requested | Oral presentation: 17 min + 3 min questions |
|---|---|
| Please select between one and three keywords related to your abstract | Nuclear physics - experimental |
| 2nd keyword (optional) | Nucleosynthesis |
| 3rd keyword (optional) | Stellar explosions and mergers - observations |
