Search for n(n)over-bar oscillation in super-kamiokande I

A search for nn oscillation, a process of JABI = 2 predicted by L-R, symmetric gauge theories, is undertaken using the 24.5 X 1033 neutron-yr exposure of the Super-Kamiokande 1. The lifetime's lower limit for neutron bound in oxygen has been determined to be 1.77 x 1032 yrs at the 90 % confidence level by applying Bayesian statistics to incorporate most major sources of experimental uncertainties. This limit corresponds to the oscillation time for a free neutron, which is calculated to be 2.36 x 108 s by using a theoretical suppression factor of 1.0 x 1023 S-1.