During ~ decay (Beta minus) the emission of anti neutrino particle is supported by which of the following statement (s) ?

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Angular momentum conservation holds good in any nuclear reaction

None of these.

The KE of emitted ~ particle is varying continuously from O to a maximum value.

Linear momentum conseravation holds good in any nuclear reaction

answer is A, B, C.

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Detailed Solution

If the nuclear reaction involving $β^{-}$ decay is

$n \to p + e^{- 1}$ , then the spins on two sides are not equal

as all three neutron, proton and electron have spin of

$\pm \frac{1}{2}$ so to conserve angular momentum (spin) some other particle must be emitted.

Through experiments it has been observed that direction of emitted electron and recoiling nuclei are almost never exactly opposite as required for linear momentum to be conserved. During ~ decay the energies of electron is found to vary continuously from 0 to a maximum value (This maximum value is characteristic of nuclide). To explain this experimental observation also, emission of some other particle is needed which carries away some energy .

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