Probing the quadrupole transition strength of <sup>15</sup>C by deuteron inelastic scattering
ORAL
Abstract
Valence-neutron decoupling is expected to happen in one-neutron halo nuclei due to the extended wave function of the valence neutron. The degree of coupling can be described by the difference in the neutron and proton contribution to the quadrupole transition. Core polarization in the transition between the ground state and first excited state in one-neutron halo nucleus 15C might be weakly induced by the valence neutron. In order to investigate it, deuteron elastic scattering from 15C and inelastic scattering reactions to the first excited state of 15C were measured using a radioactive beam of 15C in inverse kinematics using HELIOS. The matter deformation length δd=1.04(10) fm has been extracted from the inelastic scattering differential cross sections. The ratio of neutron and proton matrix element Mn/Mp=3.56(36) has been determined. Neutron and proton effective charges of 15C will be discussed. Results from ab-initio no-core configuration interaction calculations will also be compared with the experimental observations. This result supports a moderated core decoupling effect of the valence neutron in 15C, in line with the interpretation of other carbon isotopes.
*The authors would like to acknowledge the hard work of the support and operations staff at ATLAS. This research used resources of Argonne National Laboratory's ATLAS facility, which is a Department of Energy Office of Science User Facility. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No.~DE-AC02-06CH11357(ANL).
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Presenters
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Jie Chen
- Argonne National Laboratory