The decay property of was studied using a 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 states in . There is no clear beta decay to the first excited state above the proton threshold, suggesting that this state would not be the s-wave resonance in the thermal reaction of +p as was expected before. The half-life time of is determined to be 114±17 ms. The stellar reaction rate of (p,γNa is also discussed based on the present experimental result.
- Received 12 December 1991
©1992 American Physical Society