Energy dependence of neutron-proton matrix element ratios derived from 25<i>–</i>800 MeV energy proton scattering

Proton inelastic scattering of 72,74 Ni and 76,80 Zn ions at energies around 235 MeV/nucleon was performed at the Radioactive Isotope Beam Factory and studied using γ-ray spectroscopy. Angular integrated cross sections for direct inelastic scattering to the 2 + 1 and 4 + 1 states were measured. The Jeukenne-Lejeune-Mahaux folding model, extended beyond 200 MeV, was used together with neutron and proton densities stemming from quasiparticle random-phase approximation (QRPA) calculations to interpret the experimental cross sections and to infer neutron to proton matrix element ratios. In addition, coupled-channels calculations with a phenomenological potential were used to determine deformation lengths. For the Ni isotopes, correlations favor neutron excitations, thus conserving the Z = 28 gap. A dominance of proton excitation, on the other hand, is observed in the Zn isotopes, pointing to the conservation of the N = 50 gap approaching 78 Ni. These results are in agreement with QRPA and large-scale shell-model calculations.

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“…Experimental data are from Refs [52][53][54]. for elastic scattering and from Refs [55][56][57]. for inelastic scattering.…”

mentioning

confidence: 99%

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

Cortés¹,

Doornenbal²,

Dupuis³

et al. 2018

Phys. Rev. C

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“…The data were obtained in . In addition, we assumed deformation parameter values obtained in several works from inelastic scattering data fits for proton + 208 Pb [47][48][49][50][51][52][53][54][55][56]. The energy spectra of [57,58] were also included in the data set.…”

Section: The Data Setmentioning

confidence: 99%

Role of inelastic couplings in ⁴He + ²⁰⁸Pb elastic scattering in a wide energy range

Chamon¹,

Gasques²,

Zamora³

2022

J. Phys. G: Nucl. Part. Phys.

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The phenomenological strengths of the real part of the optical potential, obtained from elastic scattering data analyses within the optical model approach, present signiﬁcant energy-dependence. This behavior has been associated to the intrinsic energy-dependence of the eﬀective nucleon-nucleon interaction. However, in earlier works, we proposed that at least part of this dependence can arise from the eﬀect of couplings to inelastic states of the nuclei. In order to deepen this study, in this paper we present extensive data analyses for the elastic scattering and inelastic excitation of 111 states of 208Pb, for the 4He + 208Pb system in a wide energy range. With the purpose of comparison, the theoretical cross sections are obtained in diﬀerent approaches for the imaginary part of the potential, and within both contexts: optical model (distorted wave Born approximation) and coupled-channel calculations.

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Dirac Calculations for Proton Inelastic Scattering at Intermediate Energies

et al. 2016

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Energy dependence of neutron-proton matrix element ratios derived from 25–800 MeV energy proton scattering

Cited by 13 publications

References 37 publications

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

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

Role of inelastic couplings in ⁴He + ²⁰⁸Pb elastic scattering in a wide energy range

Dirac Calculations for Proton Inelastic Scattering at Intermediate Energies

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Energy dependence of neutron-proton matrix element ratios derived from 25–800 MeV energy proton scattering

Cited by 13 publications

References 37 publications

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

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

Role of inelastic couplings in 4He + 208Pb elastic scattering in a wide energy range

Dirac Calculations for Proton Inelastic Scattering at Intermediate Energies

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Product

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Role of inelastic couplings in ⁴He + ²⁰⁸Pb elastic scattering in a wide energy range