Experimental test of Baryon conservation: A new limit on neutron-antineutron oscillations in oxygen

M. L. Cherry, University of Pennsylvania
K. Lande, University of Pennsylvania
C. K. Lee, University of Pennsylvania
R. I. Steinberg, University of Pennsylvania
B. Cleveland, Brookhaven National Laboratory


This paper reports the result of a search for baryon-number-nonconserving neutron-antineutron transitions in oxygen using a 300-ton water Cherenkov detector located in the Homestake gold mine at a depth of 4200 meters of water equivalent. The 90%-confidence-level upper limit for the neutron partial lifetime for this process is found to be 1.4×1030 yr. According to a recent calculation of neutron-antineutron oscillations in oxygen, this result corresponds to a lower limit on the free-neutron oscillation time of 2×107 sec. © 1983 The American Physical Society.