RevModPhys.84.1307

Additionally beneted from a well dened proton beam

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Unformatted text preview: surements to date on the inclusive and exclusive reactions on 12 C at low energies. Estimates of the cross sections using a variety of different techniques (shell model, RPA, QRPA, effective particle theory) 8 Neutrinos from decay-in-flight muons also allowed for cross section measurements for energies below 300 MeV. Rev. Mod. Phys., Vol. 84, No. 3, July–September 2012 demonstrate the robustness of the calculations. Some disagreement can be seen in the inclusive channels; this disagreement is to be expected since the final state is not as well defined as in the exclusive channels. More recent predictions employing extensive shell model calculations appear to show better agreement with the experimental data. A plot showing the collected data from the exclusive reaction 12 Cðe ; eÀ Þ12 N and 12 Cð ; À Þ12 N are shown in Figs. 6 and 7, respectively. Table VII also lists other nuclei that have been under experimental study. Proton beam stops at the Los Alamos Meson Physics Facility have also been utilized to study lowenergy neutrino cross sections on 127 I. Cross sections on iron targets have also been explored with low-energy beams at the KARMEN experiment (Ruf, 2005). Perhaps the most remarkable of such measurements was the use of MCi radiological sources for low-energy electron cross section measurements. Both the Soviet-American Gallium Experiment (SAGE) (Abdurashitov et al., 1999) and GALLium EXperiment (GALLEX) (Anselmann et al., 1995) solar neutrino experiments have made use of a MCi 51 Cr source to study the reaction 71 Gað ; eÀ Þ71 Ge to both e the ground and excited states of 71 Ge. The source strength of 51 Cr is typically determined using calorimetric techniques and the uncertainty on the final activity is constrained to about 1%–2%. The SAGE collaboration subsequently also made use of a gaseous 37 ArMCi source. Its activity, using a Joseph A. Formaggio and G. P. Zeller: From eV to EeV: Neutrino cross sections . . . 12 Ng.s.) (10-42 cm2) 1322 45 supernova physics (Langanke et al., 2004; Heger et al., 2005). Measurements of neutrino cross sections on nuclear targets is currently being revisited now that new high intensity stopped pion and muon sources are once again becoming available (Avignone et al., 2000). KARMEN, PPNP 32, 351 (1994) 40 LSND PRC 64, 065001 (2001) 35 Fukugita, et al. 30 25 e- 20 15 G. Transitioning to higher energy scales 5 ( e 12 C 10 0 20 25 30 35 40 45 50 55 60 E (MeV) FIG. 6. Cross section as a function of neutrino energy for the exclusive reaction 12 Cðe ; eÀ Þ12 N from À decay-at-rest neutrinos. Experimental data measured by the KARMEN (Zeitnitz et al., 1994) and LSND (Athanassopoulos et al., 1997; Auerbach et al., 2001) experiments. Theoretical prediction from Fukugita, Kohyama, and Kubodera, 1988. 140 LSND PRC 66, 015501 (2002) 120 Engel, et al. 100 80 60 40 20 ( 12 C µ µ- 12 Ng.s.) (10-42 cm2) variety of techniques, is constrained to better than 0.5% (Haxton, 1998; Barsanov et al., 200...
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This document was uploaded on 09/28/2013.

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