By the karmen zeitnitz et al 1994 and lsnd

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Unformatted text preview: 7). Since 37 Ar provides a monoenergetic neutrino at slightly higher energies that its 51 Cr counterpart, it provides a much cleaner check on the knowledge of such low-energy cross sections (Barsanov et al., 2007). Experimental measurements are in general in agreement with the theory, although the experimental values are typically lower than the corresponding theoretical predictions. Finally, although the cross section was not measured explicitly using a terrestrial source, neutrino capture on chlorine constitutes an important channel used in experimental neutrino physics. The reaction 37 Clðe ; eÀ Þ37 Ar was the first reaction used to detect solar neutrinos (Cleveland et al., 1998). In summary, the level at which low-energy cross sections are probed using nuclear targets is relatively few, making the ability to test the robustness of theoretical models and techniques somewhat limited. The importance of such low-energy cross sections is continually stressed by advances in astrophysics, particularly in the calculation of elemental abundances and 0 120 140 160 180 200 220 240 E (MeV) FIG. 7. Cross section as a function of neutrino energy for the exclusive reaction 12 Cð ; À Þ12 N measured by the LSND (Auerbach et al., 2002) experiment. Theoretical prediction from Engel et al., 1996. Rev. Mod. Phys., Vol. 84, No. 3, July–September 2012 As we transition from low-energy neutrino interactions to higher energies, the reader may notice that our approach is primarily focused on the scattering off a particular target, whether that target be a nucleus, a nucleon, or a parton. This approach is not accidental, as it is theoretically a much more well-defined problem when the target constituents are treated individually. With that said, we acknowledge that the approach is also limited, as it fails to incorporate the nucleus as a whole. Such departmentalization is part of the reason why the spheres of low-energy and high-energy physics appear so disjointed in both approach and terminology. Until a full, comprehensive model of the entire neutrinotarget interaction is formulated, we are constrained to also follow this approach. V. INTERMEDIATE ENERGY CROSS SECTIONS: E $ 0:1–20 GeV As we move up farther still in energy, the description of neutrino scattering becomes increasingly more diverse and complicated. At these intermediate energies, several distinct neutrino scattering mechanisms start to play a role. The possibilities fall into three main categories:  Elastic and quasielastic scattering: Neutrinos can elastically scatter off an entire nucleon liberating a nucleon (or multiple nucleons) from the target. In the case of charged current neutrino scattering, this process is referred to as ‘‘quasielastic scattering’’ and is a mechanism we first alluded to in Sec. IV.D, whereas for neutral-current scattering this is traditionally referred to as ‘‘elastic scattering.’’  Resonance production: Neutrinos can excite the target nucleon to a...
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This document was uploaded on 09/28/2013.

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