Direct probing of the cluster structure in Be12 via the α-knockout reaction

Mengjiao Lyu, Kazuki Yoshida, Yoshiko Kanada-En'yo, and Kazuyuki Ogata
Phys. Rev. C 99, 064610 – Published 14 June 2019

Abstract

Background: Recent theoretical and experimental researches using proton-induced α-knockout reactions provide direct manifestation of α-cluster formation in nuclei. In recent and future experiments, α-knockout data are available for neutron-rich beryllium isotopes. In Be12, rich phenomena are induced by the formation of α clusters surrounded by neutrons; for instance, breaking of the neutron magic number N=8.

Purpose: Our objective is to provide direct probing of the α-cluster formation in the Be12 target through associating the structure information obtained by a microscopic theory with the experimental observables of α-knockout reactions.

Method: We formulate a new wave function of the Tohsaki–Horiuchi–Schuck–Röpke (THSR) type for the structure calculation of Be12 nucleus and integrate it with the distorted-wave impulse-approximation framework for the α-knockout reaction calculation of Be12(p,pα)He8.

Results: We reproduce the low-lying spectrum of the Be12 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 α-cluster wave function are determined and utilized in the calculation of Be12(p,pα)He8 reaction at 250 MeV. The possibility of probing the clustering state of Be12 through this reaction is demonstrated by analysis of the triple differential cross sections that depend sensitively on the α-cluster amplitude at the nuclear surface.

Conclusions: This study provides a feasible approach to validate directly the theoretical predictions of clustering features in the Be12 nucleus through the α-knockout reaction.

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  • Received 8 February 2019

DOI:https://doi.org/10.1103/PhysRevC.99.064610

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Mengjiao Lyu1,*, Kazuki Yoshida2,†, Yoshiko Kanada-En'yo3,‡, and Kazuyuki Ogata1,4,5,§

  • 1Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
  • 2Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 3Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 4Department of Physics, Osaka City University, Osaka 558-8585, Japan
  • 5Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP), Osaka City University, Osaka 558-8585, Japan

  • *mengjiao@rcnp.osaka-u.ac.jp
  • yoshidak@rcnp.osaka-u.ac.jp
  • yenyo@ruby.scphys.kyoto-u.ac.jp
  • §kazuyuki@rcnp.osaka-u.ac.jp

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Issue

Vol. 99, Iss. 6 — June 2019

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