Nucleon-nucleon potentials and their test with bremsstrahlung

Jetter, M.; Hv, von Geramb

doi:10.1103/physrevc.49.1832

Cited by 22 publications

(14 citation statements)

References 27 publications

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“…This essentially simplifies the evaluation of the phase-space integrals appearing in Eq. (11). In particular, the integration over the energy variables and nucleon angles can be separated in this case.…”

Section: Introductionmentioning

confidence: 97%

In-medium effects at low temperatures in the photon bremsstrahlung

Alm¹,

Bratkovskaya²,

Röpke³

et al. 1995

Phys. Rev. C

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The infIuence of the dense nuclear medium on the process of photon bremsstrahlung in nuclear collisions at low excitation energies is investigated. The in-medium nucleon-nucleon scattering, &~matrix is incorporated in the calculations of photon bremsstrahlung cross section for nucleon-nucleus and nucleus-nucleus scattering cases. Calculations are performed in the soft photon approximation. It is shown that the Pauli blocking of intermediate scattering states and quasiparticle energy shifts due to the mean field interaction essentially suppress the photon bremsstrahlung cross section for temperatures T~10 MeV and densities n~n, (n, being. the nuclear saturation density). In the case of nucleus-nucleus collisions, when the photons are emitted from the thermalized zone, a temperature and density dependent reduction factor for the bremsstrahlung rate is calculated. It implies a typical bremsstrahlung rate which is -15% of that in the free scattering case. PACS number(s): 25.70.Lm, 21.65.+f, 24. 10. -i, 24.90.+d

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Section: Introductionmentioning

confidence: 97%

In-medium effects at low temperatures in the photon bremsstrahlung

Alm¹,

Bratkovskaya²,

Röpke³

et al. 1995

Phys. Rev. C

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“…Bremsstrahlung processes, particularly proton-proton bremsstrahlung, have long been studied as a method of assessing the importance of off-shell effects in low and intermediate energy hadronic scattering. There have been two main theoretical approaches: non-relativistic potential models [1][2][3][4][5][6][7] which include off-shell effects explicitly, and the soft photon approximation [8][9][10][11][12][13] which is written in terms of only on-shell information about the non-radiative scattering process. Soft photon amplitudes therefore give information about off-shell effects only through any discrepancy between their prediction for the bremsstrahlung spectrum and experimental measurements, and even then there is an ambiguity in that some of the discrepancy could arise from higher order on-shell effects.…”

Section: Introductionmentioning

confidence: 99%

Validity of certain soft photon amplitudes

Welsh

Fearing

1996

Phys. Rev. C

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Certain soft photon amplitudes which have been recently suggested as alternatives to the usual Low form of the soft photon approximation are studied and it is demonstrated that problems exist in their relation to the corresponding non-radiative amplitude. The non-radiative amplitude, which is an input to soft photon calculations, is in certain cases required to be evaluated outside of its physical phase space region. Also, for the case of two-body identical particle bremsstrahlung processes, the symmetrized or antisymmetrized form of these soft photon amplitudes cannot be written in terms of the symmetrized or antisymmetrized amplitude for the non-radiative process. It is found that the usual Low form of the soft photon theorem is essentially unaffected by these problems.13.75. Cs, 11.80.Cr,

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“…In detail, Jetter et al [9] calculated cross sections using the boson exchange potentials Paris and Bonn-B [1] as well as inversion potentials from the Nijmegen PWA [12] and phase shifts from the Bonn-B potential. Two kind of calculations for (p, pγ) cross sections were applied.…”

Section: A Cross Sections For (P Pγ) Bremsstrahlungmentioning

confidence: 99%

“…Application of model potentials in (p, pγ) Bremsstrahlung [9], calculations of triton binding energy [10] and -most recently -usage of boson exchange and inversion potentials in an in-medium, full-folding optical potential model for nucleon-nucleus scattering [11].…”

Section: The Quest For Off-shell Effectsmentioning

confidence: 99%

Modeling of nucleon-nucleon potentials, quantum inversion versus meson exchange pictures

Jaede¹,

Sander²,

Geramb

1997

Inverse and Algebraic Quantum Scattering Theory

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The notion of interacting elementary particles for low and medium energy nuclear physics is associated with definitions of potential operators which, inserted into a Lippmann-Schwinger equation, yield the scattering phase shifts and observables. In principle, this potential carries the rich substructure consisting of quarks and gluons and thus may be deduced from some microscopic model. In this spirit we propose a boson exchange potential from a nonlinear quantum field theory. Essentially, the meson propagators and form factors of conventional models are replaced by amplitudes derived from the dynamics of self-interacting mesons in terms of solitary fields. Contrary to deduction, we position the inversion approach. Using Gel'fand-Levitan and Marchenko inversion we compute local, energy-independent potentials from experimental phase shifts for various partial waves. Both potential models give excellent results for on-shell NN scattering data. In the off-shell domain we study both potential models in (p, pγ) Bremsstrahlung, elastic nucleon-nucleus scattering and triton binding energy calculations. It remains surprising that for * Contribution to the International Conference on Inverse and Algebraic Quantum Scattering Theory, Lake Balaton '96.

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Nucleon-nucleon potentials and their test with bremsstrahlung

Cited by 22 publications

References 27 publications

In-medium effects at low temperatures in the photon bremsstrahlung

In-medium effects at low temperatures in the photon bremsstrahlung

Validity of certain soft photon amplitudes

Modeling of nucleon-nucleon potentials, quantum inversion versus meson exchange pictures

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