Journal
PHYSICAL REVIEW C
Volume 105, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.105.025801
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2013M7A1A1075764, 2016R1A5A1013277, 2020R1A2C1005981]
- National Nuclear Security Administration through the U.S. DOE [DE-FG52-08NA28552]
- Rutgers University
- Oak Ridge Associated Universities
- Office of Nuclear Physics, Office of Science of the U.S. DOE [DE-FG02-96ER40955, DE-FG02-96ER40983, DE-AC-05-00OR22725]
- Tennessee Technological University
- University of Tennessee
- Oak Ridge National Laboratory
- National Science Foundation [PHY-2011890, PHY-1812316]
- University of Notre Dame
- Institute for Basic Science [IBS-R031-D1]
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This study aims to determine the proton branching ratios of several Mg-23 excited states that play a role in the high-temperature Na-22(p, gamma)Mg-23 reaction rate. Through experimental measurement and analysis, the proton branching ratios of these excited states have been obtained, providing an experimental foundation for improving the high-temperature reaction rate.
Background: The anomalous Ne-22 abundance measured in certain presolar graphite grains is thought to arise from the decay of Na-22 that was synthesized at high temperatures in core-collapse supernovas. To better interpret this abundance anomaly, the primary destruction mechanism of Na-22, the Na-22(p, gamma)Mg-23 reaction, must be better understood. Purpose: Determine proton branching ratios of several Mg-23 excited states that play a role in the hightemperature Na-22(p, gamma)Mg-23 reaction rate. Methods: Particle decays of Mg-23 excited states populated with the previously reported Mg-24(p, d)Mg-23 transfer reaction measurement [Kwag et al., Fur. Phys. J. A 56. 108 (2020)] were analyzed to extract proton branching ratios. The reaction was studied using a 31-MeV proton beam from the Holifield Radioactive Ion Beam Facility of Oak Ridge National Laboratory and Mg-24 solid targets. Results: Proton branching ratios of several Mg-23 excited states in the energy range E-x = 8.044-9.642 MeV were experimentally determined for the first time for the p0 and p1' (p1 + p2 + p3) decay channels. Conclusions: These new branching ratios for Mg-23 levels can provide an experimental foundation for an improved high-temperature rate of the Na-22(p, gamma)Mg-23 reaction needed to understand production of anomalously high Ne-22 abundance in core-collapse supernovas.
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