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  • 1
    ISSN: 1434-601X
    Keywords: PACS: 13.60.Le Meson production – 14.20.Gk Baryon resonances with S=0 – 14.40.Aq π,K and η mesons – 25.20.Lj Photoproduction reactions – 27.10.+h A 〈 5
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Photoproduction of η mesons from 4He has been measured for the first time. The experiment was performed at the Mainz Microtron (MAMI) using the TAPS photon spectrometer and the Glasgow/Mainz tagged photon facility. η mesons were identified in coincidence with recoil nucleons. Total and differential cross sections are presented in the photon energy range between threshold and 818 MeV. The exclusive data are used to determine the ratio of the elementary production cross sections on bound neutrons and protons, σn/σp= 0.68 ± 0.02 ± 0.09. In addition, upper limits for the total coherent cross section have been derived.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 1 (1998), S. 193-200 
    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
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    International journal of legal medicine 108 (1996), S. 252-255 
    ISSN: 1437-1596
    Keywords: Ballistics ; Gunshot wounds ; Hunting accidents ; Unsafe hunting practices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Law
    Notes: Abstract Accidental hunting firearm injuries and fatalities (257 cases from 1961 to 1992) were evaluated in detail. Most persons responsible for the accident were more than 40 years old and experienced in hunting, and 26% of the gunshot wounds were fatal. In 77% of cases the victim was shot by another person and in 23% the wound was self-inflicted. The firearms/ammunition used were pellets from shotguns (63%), bullets from rifles (31%), shotgun slugs (3.5%) and bullets from handguns (2.5%). In 22% of all accidents from pellets severe eyeball injuries were involved, and 38% of the wounds were caused from a distance of 5 m or less, including all self-inflicted injuries. The most frequent factors responsible for the accident were: improper handling of the firearm (37%), failure to notice the victim (24.1%), covering the victim while swinging on the game (14.8%), ricocheting projectiles (13.6%), inadequate storage of the firearm (11.7%) and mistaking the victim for game (9.3%). In some cases more than one factor contributed to the accident. Defective firearm/ammunition, as the only non-human factor, was involved in only 1.6% of accidents. Some aspects of the prevention and the forensic investigation of hunting accidents are discussed.
    Type of Medium: Electronic Resource
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