element

Information about Magnesium-21:


Wikipedia	Neutron Cross Sections	X-Ray Transitions	X-Ray Attenuation

Mass-Energy Data:

Atomic Mass:	21.011714	±	0.000018	amu
Excess Mass (Δ):	10.911681	±	0.016416	MeV
Binding Energy:	149.197857	±	0.016416	MeV
β^- Decay Energy:	-15.207000	±	0.299000	MeV #

"The 1995 update to the atomic mass evaluation" by G.Audi and A.H.Wapstra, Nuclear Physics A595 vol. 4 p.409-480, December 25, 1995.

Radioactive Decay Data:

Spin: /2,5/2)+
Half life: 122 ms ( 0.122 sec., λ = 5.68153 s^-1)
Mode of decay:
E.C.
to
21
11
Na
(Q = 13.096 MeV)
Mode of decay: E.C. +
1
1
p⁺ to
20
10
Ne
(Q = 10.665 MeV) Branch ratio: 29.30 %
Possible parent nuclides:
E.C. +
1
1
p⁺ from
22
14
Si

R.R.Kinsey, et al.,The NUDAT/PCNUDAT Program for Nuclear Data,paper submitted to the 9 th International Symposium of Capture-Gamma_raySpectroscopy and Related Topics, Budapest, Hungary, Octover 1996.Data extracted from NUDAT database (Jan. 14/1999)