Neutron transition density for the lowest 2+ state of 18O

doi:10.1016/0370-2693(86)90641-6

Physics Letters B

Volume 169, Issues 2–3, 27 March 1986, Pages 157-160

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Abstract

Scattering of 135 MeV protons is used to fit an expansion in radial basis functions of the neutron transition density for the lowest 2⁺ state of ¹⁸O. The narrow error envelope shows good radial sensitivity. The results are consistent with electromagnetic decay data for the mirror transition in ¹⁸Ne.

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Low-lying 2+ states in neutron-rich oxygen isotopes in quasiparticle random phase approximation
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The properties of the low-lying, collective 2₁⁺ states in neutron-rich oxygen isotopes are investigated in the framework of self-consistent microscopic models with effective Skyrme interactions. In RPA the excitation energies E_2⁺₁ can be well described but the transition probabilities are much too small as compared to experiment. Pairing correlations are then accounted for by performing quasiparticle RPA calculations. This improves considerably the predictions of B(E2) values and it enables one to calculate more reliably the ratios M_n/M_p of neutron-to-proton transition amplitudes. A satisfactory agreement with the existing experimental values of M_n/M_p is obtained.
Inelastic proton scattering as a mean for the determination of neutron and proton matrix element ratios
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The determination of ratio of neutron over proton matrix elements by inelastic proton scattering, for 0⁺→2⁺ transitions, is investigated via the comparison between experimental data and theoretical calculations. Calculations into the context of a macroscopic and a microscopic description are performed for a wide mass range nuclei: ¹⁸O, ³⁰Si, ^32,34S, ⁴⁸Ca, ⁸⁸Sr, for which these ratios were determined previously with an independent technique. At that point the choice of the theoretical model may be very critical. It is thus the purpose of this investigation to point out the most suitable model. It is found that in general both theoretical models can be employed for the reliable determination of neutron over proton matrix element ratios.
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Microscopic analysis of the 88Sr(p, p′) reaction at E<inf>p</inf> = 201.5 MeV
1988, Nuclear Physics, Section A
Differential cross sections for 201.5 MeV proton scattering from ⁸⁸Sr were measured. From the analysis of the elastic data, no unique optical-model potential could be obtained, but the radial moments are well determined. In a macroscopic analysis of the collective states it turns out that if the optical potential and transition potential are chosen consistently, unambiguous potential deformation lengths can be obtained even though the optical potential is not unique. Taking into account the range and density dependence of the underlying effective interaction reliable neutron deformation lengths can be obtained. For inelastic transitions of various character microscopic distorted-wave calculations with a density-dependent interaction based on the Paris potential were performed. The nuclear structure was taken from one broken-pair calculations in a large model space, calibrated by (e,e′) data. In general a good description is obtained for states with spins ranging from 2⁺ to 10⁻. These calculations indicate that the central spin-independent part of the effective interaction is slightly too strong, while the spin-orbit part seems to be too weak or too weakly density dependent.

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¹: Present address: Harris Semiconductor, Mail Stop 51–180, Melbourne, FL 32901, USA.

²: Present address: Department of Physics, College of William and Mary, Williamsburg, VA 23189, USA.

³: Present address: Department of Physics, University of New Hampshire, Durham, NH 03824, USA.

⁴: Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

⁵: Present address: Department of Physics, University of Virginia, Charlottesville, VA 22901, USA.

⁶: Present address: Department of Physics, George Washington University, Washington, DC 20052, USA.

⁷: Present address: Supercomputer Computations Research Institute, Florida State University, Tallahassee, FL 32306, USA.

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Physics Letters B

Abstract

References (15)

Phys. Rev. Lett.

Nucl. Phys.

Phys. Rev. Lett.

Phys. Lett.

Adv. Nucl. Phys.

Neutron-nucleus collisions — a probe of nuclear structure

Advances methods in the evaluation of nuclear scattering data

Cited by (32)

Proton and neutron matrix elements for nuclear transitions in exotic nuclei

Low-lying 2<sup>+</sup> states in neutron-rich oxygen isotopes in quasiparticle random phase approximation

Inelastic proton scattering as a mean for the determination of neutron and proton matrix element ratios

Energy levels of light nuclei A = 18-19

Microscopic analysis of intermediate-energy proton scattering from <sup>58</sup>Ni and <sup>208</sup>Pb

Microscopic analysis of the <sup>88</sup>Sr(p, p′) reaction at E<inf>p</inf> = 201.5 MeV