Analysis of γn→nπ+π− and γn→pπ−π0 reactions from threshold up to 1 GeV

Carbonara, F.; Chiefari, G.; Drago, E.; Gialanella, G.; Merola, L.; Napolitano, M.; Rinzivillo, R.; Sciacca, G.; Rossi, Valeria; Susinno, G.

doi:10.1007/bf02724576

Cited by 23 publications

(7 citation statements)

References 7 publications

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“…7 that the π + π − n and π − π 0 n cross sections are practically equal to the corresponding π + π − p and π + π 0 p cross sections. Comparison with the old data for π + π − n [31] shows that the theory gives values systematically higher than the experimental results by about 20 % at the maximum of the cross section.…”

Section: The γN → ππN Modelmentioning

confidence: 65%

Double-pion photoproduction on nucleon and deuteron

2005

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Photoproduction of two pions on nucleon and deuteron is studied for photon energies from threshold up to Eγ = 1.5 GeV. For the elementary operator an effective Lagrangean approach is used with resonance and Born contributions. The model parameters are fixed by resonance decay widths and multipole analyses of single pion photoproduction. A satisfactory description of total cross sections of two-pion production on the proton for various charge channels is achieved, except for π 0 π 0 production for which a significant underestimation is found near threshold. The operator then serves for the evaluation of this reaction on the deuteron in the impulse approximation. In addition, N N rescattering in the final state is taken into account, but πN and ππ rescatterings are neglected. Results are presented for total cross sections and target asymmetries.PACS numbers: 13.60.-r, 13.60. Le, 21.45.+v,

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Section: The γN → ππN Modelmentioning

confidence: 65%

Double-pion photoproduction on nucleon and deuteron

2005

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“…More results on the one-π background are presented in [351,58]. [410,416,417,411,412,413,414,415,418,419]; preliminary data have been communicated by [424,425,426]. In the panel, representing γn → nπ 0 π 0 , the shaded area shows the cross-section measurement by [415].…”

Section: Appendix C1 Quasi-elastic Scatteringmentioning

confidence: 99%

“…For the error bars we added the systematical and statistical uncertainties (∆ 2 = ∆ 2stat + ∆ 2 sys ) as quoted by the experiments. The data are taken from[410,416,417,411,412,413,414,415,418,419]; preliminary data have been communicated by[424,425,426]. In the panel, representing γn → nπ 0 π 0 , the shaded area shows the cross-section measurement by[415].…”

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confidence: 99%

Transport-theoretical description of nuclear reactions

et al. 2012

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In this review we first outline the basics of transport theory and its recent generalization to offshell transport. We then present in some detail the main ingredients of any transport method using in particular the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) implementation of this theory as an example. We discuss the potentials used, the ground state initialization and the collision term, including the in-medium modifications of the latter. The central part of this review covers applications of GiBUU to a wide class of reactions, starting from pion-induced reactions over proton and antiproton reactions on nuclei to heavy-ion collisions (up to about 30 AGeV). A major part concerns also the description of photon-, electron-and neutrino-induced reactions (in the energy range from a few 100 MeV to a few 100 GeV). For this wide class of reactions GiBUU gives an excellent description with the same physics input and the same code being used. We argue that GiBUU is an indispensable tool for any investigation of nuclear reactions in which final-state interactions play a role. Studies of pion-nucleus interactions, nuclear fragmentation, heavy-ion reactions, hypernucleus formation, hadronization, color transparency, electronnucleus collisions and neutrino-nucleus interactions are all possible applications of GiBUU and are discussed in this article.

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“…Total cross section of γp −→ π + π − p, γp −→ π + π − π 0 p and γp −→ π + π − p+neutrals. Data are from [55,56,57,58,59,60,61,62,48,63,64,65]. Figure 7: Total cross section of γp −→ π + π − π 0 p in comparison with γp −→ 2π + π − n and γp −→ 3π + 3π − n in comparison with γp −→ 2π + 2π − π 0 p. Data are from [57,56,55,42,48,59,60,61,65].…”

Section: Figurementioning

confidence: 99%

“…Data are from [55,56,57,58,59,60,61,62,48,63,64,65]. Figure 7: Total cross section of γp −→ π + π − π 0 p in comparison with γp −→ 2π + π − n and γp −→ 3π + 3π − n in comparison with γp −→ 2π + 2π − π 0 p. Data are from [57,56,55,42,48,59,60,61,65]. C Compilation of routines/functions function BREITWIGNER(SIGMA 0, GAMMA, DMM, EPS PRIME): calculates cross section (in µbarn) of a resonance with width GAMMA (in GeV), mass DMM (in GeV), maximum cross section SIGMA 0 (in µbarn) and NRF energy of the photon (in GeV) according to the Breit-Wigner formula subroutine CROSSDIR(EPS PRIME): collection of functions (SINGLEBACK, TWOBACK) which calculates the cross section (at the NRF energy EPS PRIME of the incident photon) of the direct channel (not isospincorrected)…”

Section: Figurementioning

confidence: 99%

Monte Carlo simulations of photohadronic processes in astrophysics

Mücke

Engel

Rachen

et al. 2000

Computer Physics Communications

404

430

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A new Monte Carlo program for photohadronic interactions of relativistic nucleons with an ambient photon radiation field is presented. The event generator is designed to fulfil typical astrophysical requirements, but can also be used for radiation and background studies at high energy colliders such as LEP2 and HERA, as well as for simulations of photon induced air showers. We consider the full photopion production cross section from the pion production threshold up to high energies. It includes resonance excitation and decay, direct single pion production and diffractive and non-diffractive multiparticle production. The cross section of each individual process is calculated by fitting experimental data, while the kinematics is determined by the underlying particle production process. We demonstrate that our model is capable of reproducing known accelerator data over a wide energy range.

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Analysis of γn→nπ+π− and γn→pπ−π0 reactions from threshold up to 1 GeV

Cited by 23 publications

References 7 publications

Double-pion photoproduction on nucleon and deuteron

Double-pion photoproduction on nucleon and deuteron

Transport-theoretical description of nuclear reactions

Monte Carlo simulations of photohadronic processes in astrophysics

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