New Upper Bound On The Electron Anti-Neutrino Mass

Hiroshi Kawakami,Shuichi Kato, T Ohshima,Sadao Shibata,K Ukai,Naotake Morikawa,Norio Nogawa, Kazunobu Haga,Teruyasu Nagafuchi, Masao Shigeta,Yoshimitsu Fukushima,T Taniguchi

PHYSICS LETTERS B（1991）

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摘要

A new upper bound of m(v) < 13 eV at 95% CL has been obtained on the electron anti-neutrino mass. Thus result is based on a more than tenfold improvement in data relative to our previous measurements of the beta-spectrum in H-3 decay, and is in conflict with the finite mass of 17 < m(v) < 40 eV reported by an ITEP group.

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upper bound,spectrum

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