Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 28: Nuclear and Particle Astrophysics I
HK 28.5: Vortrag
Mittwoch, 10. März 2004, 12:00–12:15, F
What neutral-current ν−208Pb scattering can tell about supernova neutrinos — •N. Jachowicz, K. Vantournhout, K. Heyde, and J. Ryckebusch — Institute for Subatomic and Radiation Physics, Ghent University, Proeftuinstraat 86, B-9000 Gent, Belgium
In a type II supernova explosion an enormous amount of (anti)neutrinos of all flavours is emitted. They are escaping from very close to the center of the star, carrying away by far the largest part of the released energy. The terrestrial detection of these neutrinos would provide invaluable information on the supernova event. We present cross section calculations for neutral-current neutrino scattering off 208Pb and discuss the relevance of various aspects of these processes for the detection of supernova neutrinos. We examine the influence of the supernova-neutrino energy-spectrum on the response and discuss the importance of the distribution’s average energy and width. We note a large sensitivity of the folded cross sections to the high energy tail of the spectrum. Since a galactic supernova is a rare occurrence, it is crucial to gather as much information as possible in the event. Distinguishing between neutrinos and antineutrinos can give additional information. Therefore, we investigate the spin dependence of nucleon knockout processes and observe considerable asymmetries in the polarization characteristics of the outgoing nucleons. These asymmetries are strongly dependent on the helicity of the incoming neutrino, and hence provide a potential way to distinguish between neutrinos and antineutrinos in neutral current processes.