The decay property of Na20 was studied using a Mg20 beam to learn better the onset mechanism of the rapid-proton process. The delayed protons were successfully measured, which correspond to one of the possible 1+ states in Na20. There is no clear beta decay to the first excited 1+ state above the proton threshold, suggesting that this state would not be the s-wave resonance in the thermal reaction of Ne19+p as was expected before. The half-life time of Mg20 is determined to be 11417 ms. The stellar reaction rate of Ne19(p,)20Na is also discussed based on the present experimental result.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics