25 research outputs found
The Central Temperature of the Sun can be Measured via the Be Solar Neutrino Line
A precise test of the theory of stellar evolution can be performed by
measuring the difference in average energy between the neutrino line produced
by electron capture in the solar interior and the corresponding
neutrino line produced in a terrestrial laboratory. The high temperatures in
the center of the sun broaden the line asymmetrically, FWHM = 1.6~keV, and
cause an average energy shift of 1.3~keV. The width of the Be neutrino line
should be taken into account in calculations of vacuum neutrino oscillations.Comment: RevTeX file, 9 pages. For hardcopy with figure, send to
[email protected]. Institute for Advanced Study number AST 93/4
Solar neutrinos observed by GALLEX at Gran Sasso
International audienceWe have measured the rate of production of Ge from Ga by solar neutrinos. The target consists of 30.3 t of gallium in the form of 8.13 M aqueous gallium chloride solution (101 t), shielded by 3300 m water equivalent of standard rock in the Gran Sasso Underground Laboratory (Italy). In nearly one year of operation, 14 measurements of the production rate of Ge were carried out to give, after corrections for side reactions and other backgrounds, an average value of 8319 (stat.)8 (syst.) SNU (l) due to solar neutrinos. This conclusion constitutes the first observation of solar pp neutrinos. Our result is consistent with the presence of the full pp neutrino flux expected according to the "standard solar model" together with a reduced flux of B+Be neutrinos as observed in the Homestake and Kamiokande experiments. Astrophysical reasons remain as a possible explanation of the solar neutrino problem. On the other hand, if the result is to be interpreted in terms of the MSW effect, it would fix neutrino masses and mixing angles within a very restricted range
Status of the GALLEX solar neutrino experiment with emphasis on error treatment and on blank runs
The status of the GALLEX solar neutrino experiment is presented. Emphasis is given on error treatment and on blank run
The status of GALLEX
The present status of the Gallium Solar Neutrino Experiment to be performed by the International GALLEX collaboration is described. This experiment is now in its implementation phase.After a short introduction and an outline of the basic experimental procedure, details will be given on different parts of the experimentSolar neutrino