Saved Bookmarks
| 1. |
What is the value of charge and mass of beta particles ? Why is beta particle energy spectrum continuous ? |
|
Answer» Mass of beta particle is `m=9.1xx10^(-31)` kg Continuousspectrum 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 bedifferent 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. |
|