Search for the proton decay mode p → ν K+ in Soudan 2

W. W.M. Allison, G. J. Alner, D. S. Ayres, G. Barr, W. L. Barrett, C. Bode, P. M. Border, C. B. Brooks, J. H. Cobb, R. Cotton, H. Courant, D. M. Demuth, T. H. Fields, H. R. Gallagher, C. Garcia-Garcia, M. C. Goodman, R. Gran, T. Joffe-Minor, T. Kafka, S. M.S. KasaharaW. Leeson, P. J. Litchfield, N. P. Longley, W. A. Mann, M. L. Marshak, R. H. Milburn, W. H. Miller, L. Mualem, A. Napier, W. P. Oliver, G. F. Pearce, E. A. Peterson, D. A. Petyt, L. E. Price, K. Ruddick, J. Schneps, M. H. Schub, R. Seidlein, A. Stassinakis, H. Tom, J. L. Thron, V. Vassiliev, G. Villaume, S. Wakeley, D. Wall, N. West, U. M. Wielgosz

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


We have searched for the proton decay mode p → ν K+ using the one-kiloton Soudan 2 high resolution calorimeter. Contained events obtained from a 3.56 kiloton-year fiducial exposure through June 1997 are examined for occurrence of a visible K+ track which decays at rest into μ+ ν or π+ π0. We found one candidate event consistent with background, yielding a limit, τ/B(p → ν K+) > 4.3 × 1031 years at 90% CL with no background subtraction.

Original languageEnglish (US)
Pages (from-to)217-224
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - May 14 1998

Bibliographical note

Funding Information:
This work was undertaken with the support of the US Department of Energy, the State and University of Minnesota and the UK Particle Physics and Astronomy Research Council. We wish to thank the following for their invaluable help with the Soudan 2 experiment: the staffs of the collaborating laboratories; the Minnesota Department of Natural Resources for allowing us to use the facilities of the Soudan Underground Mine State Park; the staff of the Park, particularly Park Managers D. Logan and P. Wannarka, for their day to day support; and Messrs B. Anderson, J. Beaty, G. Benson, D. Carlson, J. Eininger and J. Meier of the Soudan Mine Crew for their work in the installation and running of the experiment.


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