What is beta decay?
A small introduction about three types of radio-activities see below.
$- Three main types.
@- Five additional types, for sake of completeness.
See this to start with.
Different modes of beta decay are as follows. There is no change of mass number of the daughter nucleus. However the atomic number changes to one greater in case of
$ Electron emission,
Electron capture, In this case the nucleus captures an orbiting electron and emits a neutrino. The daughter nucleus is unstable. Daughter nucleus has atomic number one less.
@ For sake of completeness. Following types of
Bound state beta decay, In this decay free neutron or nucleus beta decays to electron and antineutrino. The electron thus produced is not emitted but is captured by the atom to fill up one of its vacant electronic shells, the daughter nucleus is unstable.
Double beta decay, Similar to single electron case but some nucleus emits two electrons and two antineutrinos. Daughter nucleus has atomic number two more.
Double electron capture, some nucleus absorbs two orbital electrons and emits two neutrinos. The daughter nucleus is unstable and has atomic number two less.
Electron capture with positron emission, the nucleus absorbs one orbital electron, emits one positron and two neutrinos. Daughter nucleus has atomic number two less.
Double positron emission, A nucleus emits two positrons and two neutrinos. Daughter nucleus has atomic number two less.