Unexpectedly enhanced $\alpha$-particle preformation in ${}^{48}$Ti probed by the $(p,p\alpha )$ reaction

Abstract

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 synthesis of the elements in stars. However, the $\alpha$-particle formation in medium-mass nuclei has been poorly known despite its importance. Here, based on the ${}^{48}\mathrm{Ti}(p,p\alpha {)}^{44}\mathrm{Ca}$ reaction analysis, we report that the $\alpha$-particle formation in a medium-mass nucleus ${}^{48}\mathrm{Ti}$ is much stronger than that expected from a mean-field approximation, and the estimated average distance between $\alpha$ particle and the residue is as large as 4.5 fm. This new result poses a challenge of describing four nucleon correlations by microscopic nuclear models.

arXiv comment6 pages, 4 figures

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Cited by in corpus (9)

• $\alpha$ knockout reaction as a new probe for $\alpha$ formation in $\alpha$-decay nuclei
• Density profiles near nuclear surface of ${}^{44,52}$Ti: An indication of $\alpha$ clustering
• The study of the alpha formation probability in 10Be and 12Be within the microscopic cluster model
• Role of Tensor Interaction as Salvation of Cluster Structure in ${}^{44}$Ti
• Visualization of nuclear many-body correlations with the most probable configuration of nucleons
• Significance of the refraction effect on the $p$-$d$ elementary process in the ($p$,$pd$) reaction
• Three-Dimensional Approach Applied to Quasi-stationary States of Deformed $\alpha$-Emitters
• Effective polarization in proton-induced $\alpha$ knockout reactions
• Systematic analysis of the nuclear absorption effect on the cross section of the knockout reaction