Feasibility of /sup 81/Br(nu,e/sup -/)/sup 81/Kr solar neutrino experiment

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Several ingenious solutions have been offered for the solar neutrino problem - a defect in the solar model, the appearance of a new type of neutrino physics, the sun is no longer burning, etc. The range of these proffered solutions stresses the need for a new experiment to study the sun. The modern pulsed laser now makes possible a new solar neutrino test which examines an independent neutrino source in the sun. A recently proposed experiment would use the reaction /sup 81/Br(nu,e/sup -/)/sup 81/Kr to measure the flux of /sup 7/Be neutrinos from the sun. When /sup 7/Be decays by ... continued below

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Hurst, G.S.; Allman, S.L.; Chen, C.H.; Kramer, S.D.; Thomson, J.O. & Cleveland, B. May 1, 1985.

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Several ingenious solutions have been offered for the solar neutrino problem - a defect in the solar model, the appearance of a new type of neutrino physics, the sun is no longer burning, etc. The range of these proffered solutions stresses the need for a new experiment to study the sun. The modern pulsed laser now makes possible a new solar neutrino test which examines an independent neutrino source in the sun. A recently proposed experiment would use the reaction /sup 81/Br(nu,e/sup -/)/sup 81/Kr to measure the flux of /sup 7/Be neutrinos from the sun. When /sup 7/Be decays by electron capture to make /sup 7/Li, a neutrino is emitted at 0.862 MeV and the flux of these on the earth is about 4 x 10/sup 9/ cm/sup -2/ s/sup -1/, according to the standard model. Therefore, an experiment based on /sup 81/Br(nu,e/sup -/)/sup 81/Kr which is sensitive to these lower energy neutrinos would be of fundamental importance. To first order, the chlorine experiment detects the /sup 8/B neutrinos while bromine detects the much more abundant /sup 7/Be neutrino source. In practice, the proposed bromine experiment would be very similar to the chlorine radiochemical experiment, except that /sup 81/Kr with a half-life of 2 x 10/sup 5/ years cannot be counted by decay methods. With an experiment of about the same volume as the chlorine experiment (380 m/sup 3/) filled with CH/sub 2/Br/sub 2/, the model predicts about 2 atoms of /sup 81/Kr per day. The bromine experiment depends entirely on the RIS method, implemented with pulsed lasers, for its success. 10 refs., 3 figs.

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Pages: 8

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NTIS, PC A02/MF A01.

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  • 7. international conference on laser spectroscopy, Maui, HI, USA, 24 Jun 1985

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  • Other: DE85016380
  • Report No.: CONF-850605-4
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 5267217
  • Archival Resource Key: ark:/67531/metadc1071231

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  • May 1, 1985

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 23, 2018, 4:03 p.m.

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Hurst, G.S.; Allman, S.L.; Chen, C.H.; Kramer, S.D.; Thomson, J.O. & Cleveland, B. Feasibility of /sup 81/Br(nu,e/sup -/)/sup 81/Kr solar neutrino experiment, article, May 1, 1985; United States. (digital.library.unt.edu/ark:/67531/metadc1071231/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.