Computer Science
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt........16d&link_type=abstract
Thesis (PHD). UNIVERSITY OF PENNSYLVANIA , Source DAI-B 59/04, p. 1694, Oct 1998, 198 pages.
Computer Science
Iodine-127, Neutrino Capture
Scientific paper
We have measured the cross section for the conversion of 127I to 127Xe by electron neutrinos from the decay of stopped muons as 2.54 ± 0.80 (stat) ± 0.14 (sys) ± 0.20 (flux/ uncertainty)× 10-40/ cm2. The measurement was performed at the LAMPF proton beamstop between 1993-95. A tank containing 1540 kg of 127I in the form of NaI solution was placed 8.53 meters from the beamstop where it received a neutrino flux of order 5× 107/ νe/cm2/sec. The 127Xe atoms that resulted from the capture process were extracted from the target solution, placed in miniature proportional counters and counted. Our measured cross section is in good agreement with the theoretical prediction of Engel, et al., (2.1[-]3.1×10-40/ cm2) and constitutes the first determination of the capture cross section from stopped muon decay neutrinos on a nucleus to be used for (radiochemical) solar neutrino detection. The measurement is part of a larger effort to completely calibrate 127I with neutrinos across the entire solar neutrino energy range; which in the future will include a determination of the capture cross section from 7Be neutrinos using an intense 37Ar source; and a determination of the differential cross section dσ/dE on 127I from stopped muon decay neutrinos in an electronic NaI detector. In addition to our calibration efforts, we have begun construction of a prototype iodine solar neutrino detector in the Homestake mine. The detector uses 100 tons of 127I in the form of NaI solution. It is expected to have a signal comparable to that of the 615 ton chlorine detector and an order of magnitude smaller background. We have demonstrated that the detector has a rapid (~1 hour) extraction capability and improved event detection signature. Combined with a fully automated design, these capabilities will enable day versus night comparison of solar neutrino emission to be made. From theoretical calculations, 127I is expected to have an enhanced sensitivity to intermediate energy (~1 MeV) neutrinos as compared with 37Cl. It will, therefore, probe the region of the solar neutrino spectrum where greatest suppression is presently indicated.
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