Measurement of the ^8B Neutrino Spectrum with a New Technique

Details Measurement of the ^8B Neutrino Spectrum with a New Technique Measurement of the ^8B Neutrino Spectrum with a New Technique

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17114w&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The neutrino spectrum from ^8B decay is a crucial ingredient in interpreting the data from solar neutrinos obtained in the SNO and Superkamiokande detector collaborations. The strength of the beta decay is influenced by the broad continuum of the alpha unstable ^8Be nucleus. A new technique has been used at the ATLAS accelerator at Argonne National Lab to measure this alpha spectrum. A beam of 28 MeV ^8B nuclei was produced by bombarding a ^3He gas cell with a ^6Li beam. ^8B nuclei with the proper energy were separated from the primary beam with a bending magnet and transported to the focal plane of the Enge split pole magnetic spectrograph where they were implanted into a 91 μm thick Si detector. The advantage of this method, compared to earlier work, is that both alpha particles are detected and systematic effects due to energy loss in catcher foils and detector dead layers are eliminated. The effect of the positron energy deposited in the Si detector was minimized by requiring a coincidence with a thin plastic scintillator. To calibrate the detector, 2^0Na ions were produced and implanted with the same technique, and the resulting alpha lines were measured. This work was supported by DOE Contract no. W-31-109-ENG-38 and DE-AC03-76SF00098.

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