Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parametrization of the Energy Spectrum in the Tritium Beta Decay   Taking into account mixings among neutrino states, the end of the energy
spectrum of the electron in the tritium beta decay is investigated. It is shown
that for real energy resolutions of a spectrometer, $ \Delta E > 0.08$ eV, the
effective electron neutrino mass should [not] be taken in the form
$m_\beta^{(1)} = \sqrt{\sum|U_{ei}|^2 m_i^2} [m_\beta^{(2)} = \sum|U_{ei}|^2
m_i$.

20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con