$\alpha$ knockout reaction as a new probe for $\alpha$ formation in $\alpha$-decay nuclei
| Autor: | Yoshida, Kazuki, Tanaka, Junki |
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| Rok vydání: | 2021 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.106.014621 |
| Popis: | The $\alpha$-decay phenomennon has been studied for more than a century but the mechanism of the $\alpha$ particle formation and its tunneling process have not yet been fully understood. As an alternative to the $\alpha$-decay lifetime measurement, we propose the proton-induced $\alpha$ knockout reaction, ($p$,$p\alpha$), as a new probe for the surface $\alpha$ formation probability of $\alpha$-decay nuclei. The $^{210,212}$Po($p$,$p\alpha$)$^{206,208}$Pb reaction is described by the distorted-wave impulse approximation framework. It shows that the $^{212}$Po/$^{210}$Po ratio of the $\alpha$ knockout cross sections agrees with that of the surface $\alpha$ formation probabilities determined by lifetime measurements. The result implies that the ($p$,$p\alpha$) cross section is a direct probe for the surface $\alpha$ formation probability, which is an essential quantity to lead us to a complete understanding of the $\alpha$-decay phenomenon. Comment: 5 pages, 5 figures |
| Databáze: | arXiv |
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