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The $^{120}$Sn($p$,$palpha$)$^{116}$Cd reaction at 392 MeV is investigated with the distorted wave impulse approximation (DWIA) framework. We show that this reaction is very peripheral mainly because of the strong absorption of $alpha$ by the reaction residue $^{116}$Cd, and the $alpha$-clustering on the nuclear surface can be probed clearly. We investigate also the validity of the so-called factorization approximation that has frequently been used so far. It is shown that the kinematics of $alpha$ in the nuclear interior region is significantly affected by the distortion of $^{116}$Cd, but it has no effect on the reaction observables because of the strong absorption in that region.
The formation of $alpha$ particle on nuclear surface has been a fundamental problem since the early age of nuclear physics. It strongly affects the $alpha$ decay lifetime of heavy and superheavy elements, level scheme of light nuclei, and the synthes
The proton-induced $alpha$ knockout reaction has been utilized for decades to investigate the $alpha$ cluster states of nuclei, of the ground state in particular. However, even in recent years, it is reported that the deduced $alpha$ spectroscopic fa
Direct evidence of the $alpha$-cluster manifestation in bound states has not been obtained yet, although a number of experimental studies were carried out to extract the information of the clustering. In particular in conventional analyses of $alpha$
We have investigated the heaviest one-neutron halo candidate C-19 nucleus. Few-body model calculations of cross section angular distributions for the C-19(p,d)C-18 reaction, together with the test calculations carried out for the C-17(p,d)C-16 reacti
A measurement of the pp --> p p eta reaction at the excess energy of Q = 15.5 +- 0.4 MeV has been carried out at the internal beam facility COSY-11 with an integrated luminosity of 811 nb^-1 The number of ~24000 identified events permits a precise de