We propose to exploit the angular distribution of the positrons emitted in the reaction <(nu)over bar>(e) + p --> n + e(+) to extract a possible antineutrino signal from the Superkamiokande background. From the statistics collected in just 101.9 days one obtains a model independent upper bound on the antineutrino flux Phi(nu)- (E(nu)-> 8.3 MeV) < 9 . 10(4) cm(-2) s(-1) at the 95% C.L. By assuming the same energy spectrum as for the (8)B neutrinos, the 95% C.L. bound is Phi(nu)- (E(nu)-> 8.3 MeV) < 6 . 10(4) cm(-2) s(-1). Within three years of data taking, the sensitivity to nu(e) --> <(nu)over bar>(e) transition probability will reach the 1% level, thus providing a stringent test of hybrid oscillation models. (C) 1997 Elsevier Science B.V.
Superkamiokande and solar antineutrinos
VILLANTE, FRANCESCO LORENZO
1997
Abstract
We propose to exploit the angular distribution of the positrons emitted in the reaction <(nu)over bar>(e) + p --> n + e(+) to extract a possible antineutrino signal from the Superkamiokande background. From the statistics collected in just 101.9 days one obtains a model independent upper bound on the antineutrino flux Phi(nu)- (E(nu)-> 8.3 MeV) < 9 . 10(4) cm(-2) s(-1) at the 95% C.L. By assuming the same energy spectrum as for the (8)B neutrinos, the 95% C.L. bound is Phi(nu)- (E(nu)-> 8.3 MeV) < 6 . 10(4) cm(-2) s(-1). Within three years of data taking, the sensitivity to nu(e) --> <(nu)over bar>(e) transition probability will reach the 1% level, thus providing a stringent test of hybrid oscillation models. (C) 1997 Elsevier Science B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
