Search for Neutron-Antineutron Oscillations Using Multiprong Events in Soudan 2

Details Search for Neutron-Antineutron Oscillations Using Multiprong Events in Soudan 2 Search for Neutron-Antineutron Oscillations Using Multiprong Events in Soudan 2

2002-05-28

arxiv.org/abs/hep-ex/0205093v1

Phys.Rev.D66:032004,2002

Physics

High Energy Physics

High Energy Physics - Experiment

21 pages, 7 figures

Scientific paper

10.1103/PhysRevD.66.032004

We have searched for neutron-antineutron oscillations using the 5.56 fiducial kiloton-year exposure of the Soudan 2 iron tracking calorimeter. We require candidate n-nbar occurrences to have .GE. 4 prongs (tracks and showers) and to have kinematics compatible with nbar-N annihilation within a nucleus. We observe five candidate events, with an estimated background from atmospheric neutrino and cosmic ray induced events of 4.5 \pm 1.2 events. Previous experiments with smaller exposures observed no candidates, with estimated background rates similar to this experiment. We set a lifetime lower limit for oscillation time in iron: T_A(Fe) > 7.2x10^{31} years. The corresponding lower limit for oscillation of free neutrons is \tau_{n-nbar} > 1.3x10^8 seconds.

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