Microscopic description of isobaric-analog-state transitions induced by 25-, 35-, and 45-MeV protons

Doering, R.R.; Patterson, D. M.; Galonsky, A.

doi:10.1103/physrevc.12.378

Cited by 45 publications

(55 citation statements)

References 47 publications

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“…The question whether a coupled-channel approach, combining the initial and final channels for a QE (p,n) reaction, within a Schrödinger equation set [17,19,50], could bring in some tangible benefits over DWBA, may be addressed by examining data. In Table I, we show the ratios of total QE (p,n) cross sections from the measurements of Doehring et al [37], to estimated geometric nuclear geometric cross sections,…”

Section: B Cross Sectionsmentioning

confidence: 99%

“…In Fig. 3, we show the (p,n) cross sections from the measurements of Doehring et al [15,36,37], normalized with Coulomb (p,n) cross section, for systems that combine large target mass with low incident energy. For those systems the spread of classical trajectories into wide angles is greater and, in the ratios, one can observe plateaus past the grazing angles.…”

Section: B Cross Sectionsmentioning

confidence: 99%

“…3, we fit the geometry of isovector and isoscalar potentials to data. The QE (p,n) data we rely on are those from the measurements by Doering, Patterson and Galonsky [15,36,37] at the incident proton energies of 25, 35 and 45 MeV. We supplement these with elastic data from the EXFOR database [38] for the same target nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Symmetry energy III: Isovector skins

2017

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Isoscalar density is a sum of neutron and proton densities and isovector is a normalized difference.Here, we report on the experimental evidence for the displacement of the isovector and isoscalar surfaces in nuclei, by ∼0.9 fm from each other. We analyze data on quasielastic (QE) charge exchange (p,n) reactions, concurrently with proton and neutron elastic scattering data for the same target nuclei, following the concepts of the isoscalar and isovector potentials combined into Lane optical potential. The elastic data largely probe the geometry of the isoscalar potential and the (p,n) data largely probe a relation between the geometries of the isovector and isoscalar potentials.The targets include 48 Ca, 90 Zr, 120 Sn and 208 Pb and projectile incident energy values span the range of (10-50) MeV. In our fit to elastic and QE charge-exchange data, we allow the values of isoscalar and isovector radii, diffusivities and overall potential normalizations to float away from those in the popular Koning and Delaroche parametrization. We find that the best-fit isovector radii are consistently larger than isoscalar and the best-fit isovector surfaces are steeper. Upon identifying the displacement of the potential surfaces with the displacement of the surfaces for the densities in the Skyrme-Hartree-Fock calculations, and by supplementing the results with those from analysing excitation energies to isobaric analog states in the past, we arrive at the slope and value of the symmetry energy at normal density of 70 < L < 101 MeV and 33.5 < a V a < 36.4 MeV, respectively.

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Section: B Cross Sectionsmentioning

confidence: 99%

Section: B Cross Sectionsmentioning

confidence: 99%

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Symmetry energy III: Isovector skins

2017

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“…The results are shown in Fig. 3 and 4, where they are compared to the data of [12] and [13]. The full curves in Fig.…”

Section: Ill Numerical Calculations and Resultsmentioning

confidence: 96%

Application of the microscopic Lane model to the examination of nuclear density distribution

Deng

Zhao

Ning

1991

Z. Physik A - Hadrons and Nuclei

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The purpose of this work is to present calculations of the (p, n) charge exchange reactions which employ the density dependent interaction derived from the effective two-body interaction, and to study the reliability of a new expression of the nuclear density distribution. The results show that the theoretical framework of microscopic Lane model seems to be suitable for examining nuclear density distribution, and a reasonably good description of the (p, n) reaction can be given by using the new density distribution.

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“…Specifically, direct reaction (p, n) data initiated by 35 MeV protons (Doering et al 1975) to the isobaric analogue of the ground state of 90Zr will be sensitive to the L = 0· central multipole. The ground state of 90Zr is well described by two (valence) protons weakly coupled to an 88Sr core constrained to the 2Pl/2-1g9/2 'shell' and the final state in the reaction, namely the 0+ state in 90Nb, is taken as the isobaric analogue, the details of this description and the resultant spectroscopic factors being given in a previous paper (Rikus et al 1977).…”

Section: -1·7388mentioning

confidence: 99%

A Comparison of Effective Two-nucleon Interactions Appropriate for Use in Analyses of Inelastic Nucleon Scattering

Smith¹,

Amos²

1979

Aust. J. Phys.

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A comparison of the spatial and fourier components of a number of effective two-nucleon interactions, suitable for use in analyses of inelastic nucleon scattering data, is complemented by a comparison of their use in a variety of distorted wave analyses. Specifically, a set of effective interactions derived from 'realistic' potentials have been compared, not only with each other, but also with a semiphenomenological valence interaction that has been developed over recent years and has been used extensively in reaction data analyses.

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Microscopic description of isobaric-analog-state transitions induced by 25-, 35-, and 45-MeV protons

Cited by 45 publications

References 47 publications

Symmetry energy III: Isovector skins

Symmetry energy III: Isovector skins

Application of the microscopic Lane model to the examination of nuclear density distribution

A Comparison of Effective Two-nucleon Interactions Appropriate for Use in Analyses of Inelastic Nucleon Scattering

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