Question

Consider the isobaric mass chain A=141. Using NNDC, determine what types of ground-state beta decays are possible for different elements within this chain (?-, ?+, EC, etc.) as well as the nature (allowed, first-forbidden, etc.)

https://www.nndc.bnl.gov/

Answer 1

NNDC : National Nuclear Data Center

Isobaric mass chain A = 141

Isobars have same mass number .

In beta decay; neutron is converted into proton.

Beta electron emission occurs by the transformation of one of the nucleus’s neutrons into a proton, an electron and an antineutrino.

Beta positron decays is a similar process, but involves a proton changing into a neutron, a positron and a neutrino.

The above process gets into motion for unbalanced nucleus where excess proton or neutron is found. The decay process is guided by weak interaction and the parity and angular momentum conservation/non-conservation are guiding principles which determine the transition to be allowed or forbidden.

Negative beta-decay is possible for ground state which is allowed transition.