What is the value of charge and mass of beta particles ? Why is beta particle energy spectrum continuous ?

Explanation

Charge of beta particle is `e=1.6xx10^(-19)C`
Mass of beta particle is `m=9.1xx10^(-31)` kg
Continuous spectrum of `beta`-particle
Pauli suggested that in `beta`-particle disintegration, another particle neutrino was simultaneously emiited along with `beta`-particle . The neutrino is supposed to be fundamental particle having :
(i) zero charge, (ii) zero rest mass, and spin `1/2 (h)/(2pi)`.
A `beta`-decay can thus the represented as
`n rarr p+e^(-)+v` (neutrino)
Under neutrino hypothesis, each `beta`-decay is accompanied by disrete energy `E_(beta)` which corresponds to the end point energy in the continuous `beta`-particle spectrum. The disintegration energy is shared by `beta`-particle, neutrino and the recoil nucleus in a continuous range of different ways. The neutrino may take any amount of the available `beta`-disintegration energy so that the energy left at the disposal of the `beta`-particle will be different for each disintegration. Thus `beta`-particles of all possible energies extending from zero to a certain maximum (end point enrgy) shall be emitted as shown in the figure . Thus Pauli.s neutrino hypothesis satisfactorily explains the continuous energy range of `beta`-particle spectrum.