A NEW UPPER LIMIT OF THE ELECTRON ANTI NEUTRINO REST MASS FROM TRITIUM BETA-DECAY

Authors
BACKE H BARTH H BONN J DEGEN B EDLING T FLEISCHMANN L GROOSS JU HAID R HERMANNI A KUBE G LEIDERER P LOEKEN T MOLZ A MOORE RB OSIPOWICZ A OTTEN EW PICARD A PRZYREMBEL M SCHRADER M STEININGER M WEINHEIMER C
Citation
H. Backe et al., A NEW UPPER LIMIT OF THE ELECTRON ANTI NEUTRINO REST MASS FROM TRITIUM BETA-DECAY, Nuclear physics. B, 31, 1993, pp. 46-49
Citations number
12
Categorie Soggetti
Physics, Nuclear
Journal title
Nuclear physics. B → ACNP
ISSN journal
05503213
Volume
31
Year of publication
1993
Supplement
S
Pages
46 - 49
Database
ISI
SICI code
0550-3213(1993)31:<46:ANULOT>2.0.ZU;2-2
Abstract
A new upper limit of the electron anti neutrino rest mass has been ded uced from the tritium beta-decay spectrum. A source of molecular triti um has been investigated with a new solenoid retarding spectrometer. T he results are m(nu)e2BAR = -38.8 +/- 34.1stat +/- 15.1syst(eV)2/c4 fr om which we conclude m(nu)eBAR) less-than-or-equal-to 7.2 eV/c2 with 9 5% c.l. Our beta-endpoint corresponds to a H-3-He-3 atomic mass differ ence of DELTAm(H-3-He-3) = 18590.8 +/- 3 eV/c2 (1sigma).