Speaker
Description
The proton-induced $\alpha$ knockout reaction, ($p,p\alpha$), is a powerful probe of the $\alpha$ formation in the nucleus [1]. We have shown that a modern theoretical calculation of the $\alpha$ amplitude in the $^{20}$Ne ground state combined with the ($p,p\alpha$) reaction calculation by the distorted wave impulse approximation can quantitatively reproduce the existing experimental data [2]. On the other hand, quantitative reproductions of the $\alpha$ knockout cross section from $^{24}$Mg, $^{28}$Si, $^{32}$S, $^{40}$Ca, $^{48}$Ti, etc., are still theoretically challenging. Stimulated by the $\alpha$ knockout reaction experiment from Sn(tin) isotopes [3], the universality of the $\alpha$ formation throughout the nuclear chart is also an interesting question. In this contribution, from a reaction theory point of view, I will review the recent progress in the $\alpha$ formation phenomena studied by the ($p,p\alpha$) reaction and our recent achievement which showed a possibility that the $\alpha$ knockout reaction may be a good probe for the $\alpha$ formation on the surface of the $\alpha$ decay nuclei [4].
[1] T. A. Carey, P. G. Roos, N. S. Chant, A. Nadasen, and H. L. Chen, Phys. Rev. C 29, 1273 (1984).
[2] K. Yoshida, Y. Chiba, M. Kimura, Y. Taniguchi, Y. Kanada-En’yo, and K. Ogata, Phys. Rev. C 100, 044601 (2019).
[3] J. Tanaka et al., Science 371, 260 (2021).
[4] K. Yoshida and J. Tanaka, Phys. Rev. C 106, 014621 (2022).
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