Effect of pion external distortion on low-energy pion double charge exchange

Khankhasayev, M. Kh.; Sarafian, Haiduke; Johnson, Mikkel B.; Kurmanov, Zh. B.

doi:10.1103/physrevc.50.1424

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…For this reason, we consider only the internal distortions in this paper. In a forthcoming paper [11],we give a detailed analysis of the external distorted waves.…”

Section: Fig 2 Energy Dependence Of 0=0' Cross Section (Top Half)mentioning

confidence: 99%

Medium modification of meson propagation between two nucleons in finite nuclei

1993

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We derive simple expressions for the effect of medium modifications (or distortions) on the propagation of a pion between two nucleons in a nucleus. Our results are applicable to pion reactions in a variety of situations, but we are particularly interested in the inhuence of distortions on pion double charge exchange at low energy. We are able to calculate these distortions for a finite nucleus using a realistic choice of optical potential. We represent their effect as a modification of the Sand P-wave pion-nucleon scattering amplitudes that occur at the location of the first (or last) nucleon to be struck. We illustrate our method by showing numerical results for a shematic optical potential. PACS number(s): 25.80.e

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“…For this reason, we consider only the internal distortions in this paper. In a forthcoming paper [11],we give a detailed analysis of the external distorted waves.…”

Section: Fig 2 Energy Dependence Of 0=0' Cross Section (Top Half)mentioning

confidence: 99%

Medium modification of meson propagation between two nucleons in finite nuclei

1993

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“…For heavy and intermediate-heavy nuclei, the pnQRPA [17][18][19] and GSM [20] have been employed to describe the DCX processes. For both heavy and light nuclei, it has been shown that pion distortion plays an important role in the DCX reactions [19,21,22]. On the side of the reaction mechanism, the sequential model [7-9, 13, 17-19] and impulse approximation [10-12, 14, 15] are mainly used (for a review see, for example [2]).…”

Section: Introductionmentioning

confidence: 99%

Pauli principle and pion distortion in the p-wave pionic double charge exchange reaction

Liu

Faessler

Schwieger

et al. 1998

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

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We propose an approach which takes the Pauli principle and pion distortion into account to investigate the p-wave absorption/emission mechanism of the double charge exchange reaction. The ground state to ground-state processes 128 Te(π + , π − ) 128 Xe and 130 Te(π + , π − ) 130 Xe are discussed in the new approach. Excitation functions with a maximum energy distribution at T π ≈ 50 MeV have been obtained. The calculated differential cross sections at θ Lab. = 30 • with T π ≈ 50 MeV and their ratio agree well with experimental data and depend only slightly on the particle-particle interaction parameter g pp . Results indicate that the Pauli principle lowers the cross section and stabilizes its dependence on g pp evidently while pion distortion reduces the cross section in the energy region above the resonance.

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