Abstract
Background: Recent theoretical and experimental researches using proton-induced -knockout reactions provide direct manifestation of -cluster formation in nuclei. In recent and future experiments, -knockout data are available for neutron-rich beryllium isotopes. In , rich phenomena are induced by the formation of clusters surrounded by neutrons; for instance, breaking of the neutron magic number .
Purpose: Our objective is to provide direct probing of the -cluster formation in the target through associating the structure information obtained by a microscopic theory with the experimental observables of -knockout reactions.
Method: We formulate a new wave function of the Tohsaki–Horiuchi–Schuck–Röpke (THSR) type for the structure calculation of nucleus and integrate it with the distorted-wave impulse-approximation framework for the -knockout reaction calculation of .
Results: We reproduce the low-lying spectrum of the nucleus by using the THSR wave function and discuss the cluster structure of the ground state. Based on the microscopic wave function, the optical potentials and -cluster wave function are determined and utilized in the calculation of reaction at 250 MeV. The possibility of probing the clustering state of through this reaction is demonstrated by analysis of the triple differential cross sections that depend sensitively on the -cluster amplitude at the nuclear surface.
Conclusions: This study provides a feasible approach to validate directly the theoretical predictions of clustering features in the nucleus through the -knockout reaction.
1 More- Received 8 February 2019
DOI:https://doi.org/10.1103/PhysRevC.99.064610
©2019 American Physical Society