α knockout reaction as a new probe for α formation in α -decay nuclei
Abstract
Background: The α -decay phenomenon has been studied for more than a century. Its mechanism is simply explained by two factors: the α formation probability and the penetration process through the potential barrier.
Purpose: As an alternative to the α -decay lifetime measurement, we propose the proton-induced α knockout reaction, (p ,p α ) , as a new probe for the surface α formation probability of α -decay nuclei. Method: The Po,212210(p ,p α )Pb,208206 reaction is described by the distorted-wave impulse approximation framework. Results: It is shown that the 212Po/210Po ratio of the α knockout cross sections agrees with that of the surface α formation probabilities determined by lifetime measurements. Conclusions: It was confirmed that the (p ,p α ) reaction cross sections correspond to the α formation probability of the nuclear surface. The result implies that the (p ,p α ) cross section is a direct probe for the surface α formation probability, which is an essential quantity for complete understanding of the α -decay phenomenon.- Publication:
-
Physical Review C
- Pub Date:
- July 2022
- DOI:
- 10.1103/PhysRevC.106.014621
- arXiv:
- arXiv:2111.07541
- Bibcode:
- 2022PhRvC.106a4621Y
- Keywords:
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- Nuclear Theory;
- Nuclear Experiment
- E-Print:
- 5 pages, 5 figures