Nuclear photoabsorption and Compton scattering at intermediate energy

Koch, J.H.; Moniz, Ernest J.; Ohtsuka, N.

doi:10.1016/0003-4916(84)90141-6

Cited by 182 publications

(120 citation statements)

References 37 publications

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“…This observation is important in view of the various parameterizations of the resonance spectral function used in transport models which substantially differ at high Δ masses as discussed in [38]. Our fit supports a parametrization of the total width based on the Moniz model [39] which strongly suppresses the high-mass tail of the resonance (see [38] for details).…”

Section: Acceptance Corrected Cross Sectionssupporting

confidence: 73%

Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

et al. 2014

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Abstract. We report on baryon resonance production and decay in proton-proton collisions at a kinetic energy of 3.5 GeV based on data measured with HADES. The exclusive channels pp → npπ + and pp → ppπ 0 as well as pp → ppe + e − are studied simultaneously for the first time. The invariant masses and angular distributions of the pion-nucleon systems were studied and compared to simulations based on a resonance model ansatz assuming saturation of the pion production by an incoherent sum of baryonic resonances (R) with masses < 2 GeV/c 2 . A very good description of the one-pion production is achieved allowing for an estimate of individual baryon resonance production cross sections which are used as input to calculate the dielectron yields from R → pe + e − decays. Two models of the resonance decays into dielectrons are examined assuming a point-like RN γ * coupling and the dominance of the ρ meson. The results of model calculations are compared to data from the exclusive ppe + e − channel by means of the dielectron and pe + e − invariant mass distributions.

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Section: Acceptance Corrected Cross Sectionssupporting

confidence: 73%

Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

et al. 2014

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“…(10,12,13,15,16 [14] with error bars. For the p-p case, the present parametrization of elastic and inelastic cross sections fits to the data for whole energy range up to 3 GeV except for the some deviation around 1 GeV, which is due to the elastic cross section and does not affect the result.…”

Section: Two-body Collision Termmentioning

confidence: 99%

“…The masses of the resonances are randomly distributed according to the Breit-Wigner distribution with the momentumdependent width [12], i.e.,…”

Section: Two-body Collision Termmentioning

confidence: 99%

Analysis of the (N,xN′) reactions by quantum molecular dynamics plus statistical decay model

et al. 1995

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We propose a model based on quantum molecular dynamics (QMD) incorporated with statistical decay model (SDM) to describe various nuclear reactions in an unified way. In this first part of the work, the basic ingredients of the model are defined and the model is applied systematically to the nucleon(N )-induced reactions. It has been found that our model can give a remarkable agreement in the energy-angle double differential cross sections of (N, xN ′ ) type reactions for incident energies from 100 MeV to 3 GeV with a fixed parameter set. An unified description of the major three reaction mechanisms of (N, xN ′ ) reactions, i.e. compound, pre-equilibrium and spallation processes, is given with our model.

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“…For the modification of the real part of their energies, due to their interaction with the medium, we follow previous work on π-nucleus scattering [26,31], nuclear photo absorption [32], and nuclear response in the ∆ region [33,34], and take V ∆ − V N ≈ 25 MeV at normal nuclear density. Note that in our formalism the potentials only enter as the difference V ∆ − V N .…”

Section: Parameter Valuesmentioning

confidence: 99%

Spin-Isospin Modes in Heavy-Ion Collisions

Helgesson

Randrup

1995

Annals of Physics

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Abstract:With a view towards implementation in microscopic transport simulations of heavyion collisions, the properties of spin-isospin modes are studied in nuclear matter consisting of nucleons and ∆ isobars that interact by the exchange of π and ρ mesons. For a standard p-wave interaction and an effective g ′ short-range interaction, the dispersion relations for the spin-isospin modes, and the associated amplitudes, are calculated at various nuclear densities and temperatures, within the random-phase approximation. Quantities of physical interest are then extracted, including the total and partial ∆ decay widths and the ∆ cross sections in the nuclear medium. The self-consistent inclusion of the ∆ width has a strong effect on the ∆ cross sections at twice normal nuclear density, as compared with the result of ignoring the width. Generally, the obtained quantities exhibit a strong density dependence, but are fairly insensitive to the temperature, at least up to T = 25 MeV. Finally, it is described how these in-medium effects may be consistently included into microscopic transport simulations of nuclear collisions, and the improvements over previous approaches are discussed.

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Nuclear photoabsorption and Compton scattering at intermediate energy

Cited by 182 publications

References 37 publications

Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

Analysis of the (N,xN′) reactions by quantum molecular dynamics plus statistical decay model

Spin-Isospin Modes in Heavy-Ion Collisions

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