Asymmetry dependence of reduction factors from single-nucleon knockout of30Ne at ∼ 230 MeV/nucleon

J Lee,T Motobayashi,E Ideguchi,Y Kondo,S Michimasa,Hongna Liu ,M Matsushita,M Takechi,Kazuyuki Ogata ,H Scheit,P Doornenbal,D Steppenbeck,K Li,Handing Wang ,Yutaka Utsuno ,H Baba,Y Togano,H Sakuraï ,Satoshi Takeuchi ,N Kobayashi,N Aoi,Masaaki Kimura ,Kosho Minomo

doi:10.1093/ptep/ptw096

Abstract

Asymmetry dependence of reduction factors from single-nucleon knockout of<sup>30</sup>Ne at ∼ 230 MeV/nucleon

Highlights

A full understanding of nuclear properties requires an accurate knowledge of correlations between the nucleons
The σ−12C target-induced one-nucleon (1N) are multiplied by the spectroscopic factor predicted by the SM or antisymmetrized molecular dynamics (AMD) and the result is compared with the experimental data
The results are significantly smaller than the established systematics of Rs, which is close to unity for loosely bound nucleon removal [40]

Summary

Introduction

A full understanding of nuclear properties requires an accurate knowledge of correlations between the nucleons. The results indicate a strong dependence of Rs on the asymmetry of the Fermi surfaces in each nucleus, which is characterized by S, the difference between the neutron and proton separation energies ( S = Sn − Sp for neutron SF and S = Sp − Sn for proton SF) Such established systematics could suggest that deeply bound nucleons experience additional correlations, which are not taken into account in effective interaction theories [4], a deficiency in the reaction mechanism treatment dependent on the removed-nucleon binding energy cannot be excluded. Being rooted in the eikonal and sudden approximations, the nucleon knockout model is formulated for reactions at energies of about 80 MeV/nucleon or higher [17,18] At such high energies, the nucleon removal mechanism is expected to be surface dominant, which allows the survival of the core nucleus (heavy residue) and eliminates the need to specify the motion of fast nucleons in the nuclear interior [17,18]. To achieve a systematic study covering both extremes of the isospin asymmetry, the cross sections of the loosely bound neutron in 30Ne are measured with the 12C(30Ne, 29Ne)X reaction

Experiments

Theoretical analysis and discussion

Conclusions