Direct search for mass of neutrino and anomaly in the tritium beta-spectrum

Results of the “Troitsk ν-mass” experiment on the search for the neutrino rest mass in the tritium beta-decay are presented. Study of time dependence of anomalious, bump-like structure at the end of beta spectrum reported earlier gives indication of periodic shift of the position of the bump with respect to end-point energy with period of 0.5 year. New upper limit for electron antineutrino rest mass m ν < 2.5 eV c 2 is derived after accounting for the bump.

talk: Cape Town 1999/01/24
tritium: semileptonic decay
electron: energy spectrum
time dependence
neutrino/e: mass
upper limit
experimental results

References(5)

Figures(0)

[1]

Results of the Troitsk experiment on the search for the electron anti-neutrino rest mass in tritium beta decay

A.I. Belesev
(
- Moscow, INR and
- Kurchatov Inst., Moscow
)
,
A.I. Bleule
(
- Moscow, INR and
- Kurchatov Inst., Moscow
)
,
E.V. Geraskin
(
- Moscow, INR and
- Kurchatov Inst., Moscow
)
,
A.A. Golubev
(
- Moscow, INR and
- Kurchatov Inst., Moscow
)
,
N.A. Golubev
(
- Moscow, INR and
- Kurchatov Inst., Moscow
)

et al.

- Phys.Lett.B 350 (1995) 263-272
•
DOI:
- 10.1016/0370-2693(95)00335-I

[2]

Direct search for mass of neutrino and anomaly in the tritium beta spectrum

et al.

- Phys.Lett.B 460 (1999) 227-235
•
DOI:
- 10.1016/S0370-2693(99)00781-9

[3]

High precision measurement of the tritium $\beta$ spectrum near its endpoint and upper limit on the neutrino mass

Ch. Weinheimer
(
- Mainz U., Inst. Phys.
)
,
B. Degenddag
(
- Mainz U., Inst. Phys.
)
,
A. Bleile
(
- Mainz U., Inst. Phys.
)
,
J. Bonn
(
- Mainz U., Inst. Phys.
)
,
L. Bornschein
(
- Mainz U., Inst. Phys.
)

et al.

- Phys.Lett.B 460 (1999) 219-226,
- Phys.Lett.B 464 (1999) 352-352 (erratum)
•
DOI:
- 10.1016/S0370-2693(99)00780-7

[4]

G.J Stephenson
,
T. Goldman
,
B.H.J McKellar

- Int.J.Mod.Phys. AVol.13 (1998) 2765

[5]

Can long range anomalous neutrino interactions account for the measured tritium beta decay spectrum?

Rabindra N. Mohapatra
(
- Maryland U.
)
,
Shmuel Nussinov
(
- Tel Aviv U.
)

- Phys.Lett.B 395 (1997) 63-68
•
e-Print:
- hep-ph/9610311
•
DOI:
- 10.1016/S0370-2693(97)00054-3