Search for neutrino oscillations at LAMPF Page: 7 of 10
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vg interaction. Hylar sheets painted with natural Gd^ are located
between all scintillator planes. Neutrons from the interaction may
thermalize in the scintillator and capture on Gd, which deexcites by
emitting 4.5 gamma rays on the average. The detection of these gammas
(total energy is 7.9 HeV) provides a neutron signature. The detection
efficiency of the neutrons is expected to be about 25%, but depends on
requirements imposed on the detection of the resulting gammas.
In Figure 3 we show the expected sensitivity of E-645 to neutrino
oscillations. The vgp interaction cross section is llxlO-41 cm2.4^
Assuming a positron detection efficiency of 50%, the event rate for
maximum oscillation is 47 events/day. Background rates, which limit the
sensitivity of the experiment, are hoped to be kept to less than .1
events/day. For comparison, the best published limits are also shown in
Table I. Backgrounds due to v interactions in the detector.
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Harper, R.W.; Ling, T.Y.; Mitchell, J.W.; Romanowski, T.A.; Smith, E.S.; Timko, M. et al. Search for neutrino oscillations at LAMPF, article, January 1, 1986; United States. (https://digital.library.unt.edu/ark:/67531/metadc1102862/m1/7/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.