Everything about Proton Emission totally explained
Proton emission (also known as proton radioactivity) is a type of radioactive decay in which a
proton is ejected from a
nucleus. Proton emission can occur from high-lying excited states in a nucleus following a
beta decay, in which case the process is known as beta-delayed proton emission, or can occur from the ground state (or a low-lying
isomer) of very proton-rich nuclei, in which case the process is very similar to
alpha decay.For a proton to escape a nucleus, the proton separation energy must be negative - the proton is therefore unbound, and
tunnels out of the nucleus in a finite time. Proton emission isn't seen in naturally-occurring isotopes; proton emitters can be produced via
nuclear reactions, usually utilising some kind of
particle accelerator.
Although prompt (for example not beta-delayed) proton emission was observed from an isomer in
Cobalt-53 as early as
1969, no other proton-emitting states were found until
1981, when the proton radioactive ground states of
Lutetium-151 and
Thulium-147 were observed at experiments at the
GSI in West Germany. Research in the field flourished after this breakthrough, and to date more than 25 isotopes have been found to exhibit proton emission. The study of proton emission has aided the understanding of nuclear deformation, masses and structure, and it's a wonderfully pure example of
quantum tunneling.
In
2002, the simultaneous emission of two protons was observed from the nucleus
Iron-45 in experiments at
GSI and GANIL (Grand Accelerateur National d'Ions Lourds, near
Caen). In 2005 it was experimentally determined (at the same facility) that
Zinc-54 can also undergo double proton decay.
Further Information
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