E3S Web of Conferences 163, 00040 (2017)
https://doi.org/10.1051/epjconf/201716300040

Cluster structure and Coulomb shift in two-center mirror systems

¹ Department of Pure and Applied Physics, Kansai University, 3-3-35 Yamatecho, Suita, Osaka 564-8680, Japan.
² Nuclear Reaction Data Center, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan.

^* e-mail: itomk@kansai-u.ac.jp

Published online: 22 November 2017

Abstract

The α + ¹⁴C elastic scattering and the nuclear structure of its compound systems, ¹⁸O = α + ¹⁴C, are analyzed on the basis of the semi-microscopic model. The α + ¹⁴C interaction potential is constructed from the double folding (DF) model with the effective nucleon-nucleon interaction of the density-dependent Michigan 3-range Yukawa. The DF potential is applied to the α+¹⁴C elastic scattering in the energy range of E_α/A_α = 5.5 ~ 8.8 MeV, and the observed differential cross sections are reasonably reproduced. The energy spectra of ¹⁸O are calculated by employing the orthogonality condition model (OCM) plus the absorbing boundary condition (ABC). The OCM + ABC calculation predicts the formation of the 0⁺ resonance around E = 3MeV with respect to the α threshold, which seems to correspond to the resonance identified in the recent experiment. We also apply the OCM + ABC calculation to the mirror system, such as ¹⁸Ne = α+¹⁴O, and the Coulomb shift of ¹⁸O - ¹⁸Ne is evaluated. We have found that the Coulomb shift is clearly reduced in the excited 0⁺ state due to the development of the α cluster structure. This result strongly supports that the Coulomb shift is a candidate of new probe to identify the clustering phenomena.