KamLAND Announcement of Results:
Reactor Neutrinos Disappear


The Culmination of a Half Century Quest:
KamLAND Nails Neutrino Oscillations
Results Agree with Solar Neutrino Puzzle Solution

The KamLAND collaboration has for the first time measured the disappearance of neutrinos travelling to a detector from a power reactor on earth. For nearly fifty years, since neutrinos were discovered, scientists have been looking for anomalies in the propagation of these electron anti-neutrinos, and as shown in the plot to the left, no evidence has been found before for any discrepancy. Now the KamLAND group has found strong evidence for the apparent disappearance of the neutrinos during their flight over distances of about 180 kilometers. Moreover the parameters that describe this disappearance in terms of the oscillations of one neutrino type into another, serve to explain the long standing solar neutrino problem as well. It would thus seem that the solar neutrino problem is at last solved, and from this work combined with earlier results, it is clear that neutrinos do indeed have mass and all three types intermix. The implications of this result range from elementary particle physics to cosmology and even the origin of matter.


KamLAND Phys. Rev. Lett. draft, 9 Dec 02, 4.1M .ps file

KamLAND Phys. Rev. Lett. draft, 9 Dec 02, 1.2M .pdf file

Also here at the LANL preprint server, /hep-ex/0212021

Preprints Citing KamLAND Results

Public Level Description of KamLAND 12/02 results

The UH Connection to the KamLAND Experiment

Frequently Asked Questions about KamLAND

A Timeline of Neutrino Physics

KamLAND UH Press Release of 6 December 2002

Tohoku KamLAND Collaboration Home Page here

Nice technical figures from LBL web page

Article in Saturday 7 Dec 02 New York Times

Article in Saturday 7 Dec 02 Honolulu Advertiser

"Texas in Tuscany" XXI Symposium on Relativistic Astrophysics, Florence, Italy, 9-13 December 2002, where Atsuto Suzuki made first public presentation of the KamLAND results on 10 Decmber 2002

UH Colloquium of Jelena Maricic, 12 December 2002, with lots of plots and explanatory information.

Giorgio Gratta Dec '02 talk at SLAC with nice figures, photos, and much background material


KamLAND Project Members at University of Hawaii:

Collaboration Links


Back to UH KamLAND web page.

Last modified: 02 December 5

University of Hawaii / jgl@uhheph.phys.hawaii.edu