Question

How do angular momentum and parity change after alpha decay?

Answer 1

I momentum Angular momentum and Parity • Let us consider alpha particle undergoing transition from writical nuclear state of angular momention totalpho ito final state If, the angular momentan of particle can hange between Iit If and (I - Ifl. The mudeas atte consists of two protom and it wo neutron. All as states and cuith their spin coupled pairwire to zero. The spin of the alpha particle is there tore zero, and the total angular carried by an alpha particle inadecay process is 1 purely orbital in a character. We wild designate this by laepha. • We have parity selection rule indicating which transitions are permitted and which are absolutely forbidden by Conservation of parity. If initial and final parities are same The Ialpha must be even, of the parties are different, then I alpha must be odd. we know given initial state can be popular many different final states in the dughter nucleas, this properties properties as called fine structure of alpha decay. Example 2-decay of cm, & initial state is zero and ithus angulon momentum of alpha Particle Ialpha diseaual to the angular momentum of the final monadean state If. 242