Inverse-kinematics proton scattering onCa50: Determining effective charges using complementary probes

Abstract

We have performed measurements of the 0 + g.s. → 2 + 1 excitations in the neutron-rich isotopes 48,50 Ca via inelastic proton scattering on a liquid hydrogen target, using the GRETINA γ -ray tracking array. A comparison of the present results with those from previous measurements of the lifetimes of the 2 + 1 states provides the ratio of the neutron and proton matrix elements for the 0 + g.s. → 2 + 1 transitions. These results allow the determination of the ratio of the proton and neutron effective charges to be used in shell model calculations of neutron-rich isotopes in the vicinity of 48 Ca.

Inelastic scattering of neutron-rich Ni and Zn isotopes off a proton target

“…Measurements of electromagnetic strengths provide access only to the proton transition matrix element but not to the neutron counterparts. However, the contribution of the neutrons to the collectivity, and, more importantly, the ratio between proton and neutron matrix elements, becomes particularly relevant to characterize isotopes with single proton or neutron closed shells [23][24][25]. Therefore, it is desirable to perform measurements that allow us to probe both nucleons, such as proton inelastic scattering.…”

Ab initiomultireference in-medium similarity renormalization group calculations of even calcium and nickel isotopes

“…Such a study is timely, because neutron-rich calcium isotopes have been the focus of ongoing experimental campaigns [23][24][25][26][27][28], and investigations of proton-rich Ca isotopes are planned for the near future. Likewise, there is continued interest in neutron-rich Ni isotopes [29][30][31][32][33][34][35][36].…”

Microscopic calculation of inelastic proton scattering off O18, Be10, Be12Kanada-En’yo1, Ogata2 2019Phys. Rev. C14050View full textAdd to dashboardCite

“…In study of unstable nuclei, the neutron collectivity, i.e., the M n /M p ratio has been investigated ex-tensively with the inelastic proton scattering experiments in inverse kinematics using radioactive ion beam [3,7,9,12,[21][22][23][24][25][26][27][28][29][30][31][32]. However, the reaction analysis still contains model ambiguities, for instance, in the protonnucleus optical potentials, which are phenomenologically adjusted usually to elastic scattering cross sections but the applicability has not been well tested for inelastic scattering off exotic nuclei.…”