Super-Kamiokande, K2K/T2K Long Baseline Neutrino Oscillation Experiments
APS Rossi Prize in Astrophysics (shared) 1989
Asahi Prize in Physics (shared) 1999
Fellow of American Physical Society 1999
Fellow of AAAS 2008
Pontecorvo Prize 2009
The 2016 Breakthrough Prize in Fundamental Physics
Professor Sobel earned his B. S. from Rensselaer Polytechnic Institute and his Ph. D. (1968) from Case Institute of Technology. He joined the UCI Physics Department in 1968.
My physics interests are focused primarily on tests of conservation laws and studies of fundamental interactions between particles. Historically we have focused on studies of the neutrino and the search for nucleon decay. There is also a significant interest in astrophysics and cosmic rays. My current research consists of the continuation of the Super-Kamiokande experiment, the new long baseline neutrino oscillation experiment, T2K, and the design and planning for a new long baseline neutrino experiment with a neutrino beam from Fermilab to a new massive detector in the Homestake mine in South Dakota.
My group was heavily involved in the planning for the new long-baseline neutrino oscillation experiment in Japan, T2K. The JAERI and KEK Joint Project -- Japan-Proton Accelerator Research Complex (J-PARC, formerly JHF) is now operational in Tokai, Japan. Its high-luminosity, 50-GeV proton synchrotron offers the possibility of creating a very intense neutrino beam with extremely attractive features for precision measurements and direct tests of our understanding of neutrino mixing. The multi-detector experiment (T2K) currently beggining operation is likely to be the first neutrino oscillation experiment to discover a non-zero theta13 via appearance of electron neutrinos. It is optimized to detect electron neutrino interactions at the precise energy of maximum muon neutrino disappearance. This experiment will test what seems to be the only small angle in the neutrino mixing matrix. In addition, this experiment will precisely measure muon neutrino disappearance and may find the first evidence that the large theta23 mixing is not fully maximal. A possible second phase of the experiment, with upgraded beam and far detector, may be able to discover leptonic CP violation.
In the first phase of this experiment, began in 2009, Super-Kamiokande is the far detector target. The newly rebuilt SK has been re-calibrated for this new task.
I continue to be one of the two U.S. co-spokesmen for the Super-Kamiokande experiment and serve on the executive committee for that experiment.
T2K Experiment, 2009 - present
Super-Kamiokande Experiment (US co-spokesman), 1992-present
K2K Neutrino Experiment, 1999-present
Chooz Reactor Neutrino Experiment 1993-1998
IMB Neutrino Experiment, 1979-1992
Bugey Reactor Neutral Current Experiment 1993-1997
Savannah River Reactor Neutrino Experiments 1969-1993
South African Neutrino Experiment (CASEWITS) 1965-1969
•Search for neutrino oscillations on a long base-line at the CHOOZ nuclear power station. M. Apollonio, et. al., The CHOOZ Collaboration. Eur.Phys.J. C27, 331-374 (2003).
•Limit On the Neutrino Magnetic Moment Using 1496 Days of Super- Kamiokande-I Solar Neutrino Data. The Super-Kamiokande Collaboration. Phys.Rev.Lett. 93, 021802 (2004).
•Evidence for an oscillatory signature in atmospheric neutrino oscillation. The Super-Kamiokande Collaboration, Y. Ashie et al. Phys.Rev.Lett. 93, 101801 (2004).
•A Measurement of Atmospheric Neutrino Oscillation Parameters by Super-Kamiokande I. The Super-Kamiokande Collaboration, Y. Ashie et al. Phys. Rev. D71, 112005 (2005).
•Search for Nucleon Decay via Modes Favored by Supersymmetric Grand Unification Models in Super-Kamiokande-I. The Super-Kamiokande Collaboration, K. Kobayashi et al. Phys.Rev.D72:052007,2005
•“Reactor Neutrinos”, Th.Lasserre and H.W.Sobel. Comptes Rendus Physique, French Academy of Sciences 6(2005)749-757, (2005).
•“Solar Neutrino Measurements in Super-Kamiokande-I”, Super-Kamkiokande Collaboration (J. Hosaka et al.), Phys.Rev.D 73, 112001(2006)
•“Measurement of Neutrino Oscillation by the K2K Experiment”, K2K Collaboration: M.H. Ahn, et.al. Phys. Rev. D 74, 072003(2006).
• “A Measurement of Atmospheric Neutrino Flux Consistent with Tau Neutrino Appearance”, The Super-Kamiokande Collaboration, Phys. Rev. Lett. 97, 171801(2006).
Search for Proton Decay via p-->e+, pizero and mu+, pizero in a Large Water Cherenkov Detector, The Super-Kamiokande Collaboration S. Nishino et al.), Phys. Rev. Lett., Vol. 102, 141801 (2009)
“High Energy Neutrino Astronomy Using Upward-Going Muons in Super-Kamiokande-I”, Super-Kamiokande Collaboration (K. Abe et al.), Astrophys.J.; v.652, 198 (2006).
Search for Astrophysical Neutrino Point Sources at Super-Kamiokande
The Super-Kamiokande Collaboration, Astrophys. J. 704 (2009) 503-512, arXiv:0907.1594
Search for Neutrinos from GRB 080319B at Super-Kamiokande, The Super-Kamiokande Collaboration, Astrophys. J. 697, 730-734(2009).
Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification, The Super-Kamiokande Collaboration, Phys. Rev. D79:112010,2009 arXiv:0901.1645
Measurement of single charged pion production in the charged-current interactions of neutrinos in a 1.3 GeV wide band beam, The K2K Collaboration (A. Rodriguez et al.), Phys. Rev. D 78, 032003 (2008).
Solar neutrino measurements in Super-Kamiokande-II, The Super-Kamiokande Collaboration, Phys. Rev. D 78, 032002 (2008), arXiv:0803.4312
Search for Matter-Dependent Atmospheric Neutrino Oscillations in Super-Kamiokande, The Super-Kamiokande Collaboration (K. Abe et al.), Phys. Rev. D 77, 052001(2008).
Experimental study of the atmospheric neutrino backgrounds for p --> e+ pi0 searches in water Cherenkov detectors, S. Mine, et al. K2K Collaboration, Physical Review D, Vol.77, No.3 (2008)
Study of TeV neutrinos with upward showering muons in Super- Kamiokande, Desai S, Abe K, Hayato Y, et al., ASTROPARTICLE PHYSICS Volume: 29 Issue: 1 Pages: 42-54 (2008)
Search for Supernova Neutrino Bursts at Super-Kamiokande, Super-Kamiokande Collaboration, Astrophys.J. v.669, 519(2007)
Search for Neutral Q-Balls in Super-Kamiokande II, The Super-Kamiokande Collaboration, Submitted to Phys. Lett. B647, 18-22(2007); hep-ex/06008057
American Physical Society
American Society of Physics Teachers