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Article: Neutrino mass: a positive view.
- Article from:
- Science News
- Article date:
- April 18, 1987
- Author:
CopyrightCOPYRIGHT 1987 Science Service, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Neutrino mass: A positive view
Consideration of the evidence fromsupernova 1987A now leads a number of physicists to conclude that neutrinos probably do have a rest mass, in contrast to previous work that interprets the evidence negatively. One group--Hong-Yee Chiu, Yoji Kondo and Kwing L. Chan of the NASA Goddard Space Flight Center in Greenbelt, Md.--finds a value of about 3.6 electron volts (eV) for a possible neutrino mass. Ramanath Cowsik of Washington University in St. Louis and a group at the Max Planck Institute in West Germany both say they find two values, 4 eV and 20 eV.
Neutrinos were originally thought tohave zero rest mass. Recent ...