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  • PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions  (2)
  • PACS:13.60.Fz Elastic and Compton scattering – 25.20.-x Photonuclear reactions  (1)
  • 1
    Electronic Resource
    Electronic Resource
    On approaches to measure the electromagnetic polarizabilities of the neutron (1998)
    Springer
    The European physical journal 1 (1998), S. 193-200 
    Details
    ISSN: 1434-601X
    Keywords: PACS:13.60.Fz Elastic and Compton scattering – 25.20.-x Photonuclear reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The present experimental state of the neutron polarizabilities is discussed. Two possibilities to extract the neutron polarizabilities from experiments are considered: i) quasi-free Compton scattering from the bound neutron and ii) scattering of slow neutrons in the Coulomb field of heavy nuclei. The latter experiments have led to an intense discussion from which we conclude that all attempts to measure the neutron polarizabilities using this method have failed. It is shown that quasi-free Compton scattering from the neutron bound in the deuteron at photon energies from 200 MeV to 300 MeV is the most promising method of measuring the neutron polarizabilities. To arrive at an experimental accuracy of ± 2· 10−4fm3 when extracting the electric polarizability ¯α n , one has to measure the differential cross section in the energy range from 200 MeV to 300 MeV at backward photon scattering angles with a precision of 5%. It is shown that theoretical uncertainties of the method are mainly due to the dependence of the cross section on the selection of multipole analysis of single pion photoproduction. At present they prevent the extraction of ¯α n with an accuracy better than ± 2· 10−4fm3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050048
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  • 2
    Electronic Resource
    Electronic Resource
    Double- π0 photoproduction from the deuteron (2000)
    Springer
    The European physical journal 9 (2000), S. 1-4 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The photoproduction of two neutral pions from the deuteron has been studied for incident photon energies from 200 MeV to 820 MeV with the TAPS spectrometer at MAMI (Mainz Microtron). The total cross-section was determined and used to deduce the cross-section from the neutron. Due to the good statistical quality of the data Dalitz plots for the three particles in the exit channel (π0π0 N) could be constructed. The invariant mass distributions derived from them are presented in this paper. They indicate that the important reaction mechanism in the second resonance region is a sequential decay pattern involving the population of the Δ(1232)-resonance as an intermediate state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500070047
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photoproduction of neutral pion pairs from the proton (2000)
    Springer
    The European physical journal 9 (2000), S. 5-8 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 13.60.Le Meson production – 25.20.Lj Photoproduction reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass analysis. From threshold up to 370 MeV the total cross-section does not exceed 30 nb. For higher energies it shows a smooth rise until it reaches a maximum of about 10 μb at E γ = 740 MeV. Dalitz plots of m 2(π0π0) versus m 2(p,π0) for seven bins of incident photon energy have been analysed. For E γ 〉 610 MeV, a strong contribution of a sequential decay is observed with the Δ(1232)-resonance as intermediate state. A comparison to model calculations shows that these sequential decays presumably originate from the D 13(1520) and also the P 11(1440)-resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500070048
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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