Speaker
Yury Malyshkin
(Institute for Nuclear Research RAS, Russia; Pontifical Catholic University of Chile)
Description
A neutrino deficit is observed in radio-chemical solar neutrino experiments GALLEX and SAGE in measurements with radioactive sources. This result can be explained by neutrino transitions to a hypothetical sterile state on a short baseline, corresponding to the squared mass difference of the order of 1 eV^2. A new underground experiment to search for this type of neutrino transition is planed to be carried out at the Baksan Neutrino Observatory on the Gallium-Germanium Neutrino Telescope, which has been used in the solar neutrino experiment SAGE. The idea is to observe the neutrino capture rate at two distances from the source. A Ga target is divided in two concentric zones in a way that the neutrino path lengths in each zone are equal. A statistically significant difference of the neutrino capture rate in these zones, as well as a considerable deficiency of the average rate in both zones in comparison with the expected rate, will indicate to the existence of the neutrino oscillation on a short baseline. The key features of this experiment are the intense compact neutrino source, which provides a high flux of monochromatic neutrinos, low backgrounds (including solar neutrinos), and a well established during decades technique of neutrino detection. The experiment allows to put constraints on squared mass difference and mixing angle corresponding to the oscillations to the hypothetical sterile neutrinos.
Primary author
Yury Malyshkin
(Institute for Nuclear Research RAS, Russia; Pontifical Catholic University of Chile)
Co-authors
Alexander Shikhin
(Institute for Nuclear Research RAS, Russia)
Anatoly Kalikhov
(Institute for Nuclear Research RAS, Russia)
Anatoly Matveev
(Institute for Nuclear Research RAS, Russia)
Bruce Cleveland
(SNO Lab, Canada)
David Sinclair
(SNO Lab, Canada)
Evgeny Veretenkin
(Institute for Nuclear Research RAS, Russia)
Hamish Robertson
(U. of Washington)
Ilya Mirmov
(Institute for Nuclear Research RAS, Russia)
Jeff Nico
(National Institute of Standards and Technology, USA)
John Wilkerson
(University of North Carolina)
Sergei Danshin
(Institute for Nuclear Research RAS, Russia)
Dr
Steven Elliott
(Los Alamos National Laboratory)
Tatiana Ibragimova
(Institute for Nuclear Research RAS, Russia)
Tatiana Knodel
(Institute for Nuclear Research RAS, Russia)
Valery Gorbachev
(Institute for Nuclear Research RAS, Russia)
Prof.
Vladimir Gavrin
(Institute for Nuclear Research RAS, Russia)
Yulia Kozlova
(Institute for Nuclear Research RAS, Russia)