Information about Americium-242:


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Mass-Energy Data:

Atomic Mass:	242.059543	±	0.000002	amu
Excess Mass (Δ):	55.463975	±	0.001960	MeV
Binding Energy:	1823.472571	±	0.001986	MeV
β^- Decay Energy:	0.664820	±	0.000663	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: 1-
Half life: 16.02 h ( 57672 sec., λ = 1.20188×10^-05 s^-1)
Mode of decay:
β^-
to
242
96
Cm
(Q = 0.665 MeV) Branch ratio: 82.70 %
Mode of decay:
E.C.
to
242
94
Pu
(Q = 0.751 MeV) Branch ratio: 17.30 %
Meta state at 0.048 Mev
Spin: 5- 16.02
Half life: 141 years ( 4.44714×10⁺⁰⁹ sec., λ = 1.55864×10^-10 s^-1)
Mode of decay: γ (IT) (Q = 0.049 MeV) Branch ratio: 99.54 %
Mode of decay:
α
to
238
93
Np
(Q = 5.637 MeV) Branch ratio: 0.46 %
Mode of decay: SF Branch ratio: 1.5E-8 %
Meta state at 2.200 Mev 1412
Half life: 14.0 ms ( 0.014 sec., λ = 49.5105 s^-1)
Mode of decay: SF Branch ratio: ~100.00 %
Mode of decay:
α
to
238
93
Np
(Q = 7.788 MeV) Branch ratio: <1.5 %
Mode of decay: γ (IT) (Q = 2.200 MeV) Branch ratio: >0.00 %

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)

Magnetic Dipole Moments and Electric Quadrupole Moments
Ex(kev)	T_1/2	Spin	m(nm)	Q(b)	Ref. Std.	Method	Reference
0	16.0 h	1-	+0.3879(15)			AB/D	PR 144 994 (66)
				-2.4(7)	[241Am]	AB	PR 144 994 (66)/PR 124 1904 (61)
49	152 y	5-	+1.00(5)		[241Am]	ABLRFS	ZP A330 235 (88)
			+1.00(5)		[241Am]	OGLS	ARKfK-4185 (86)
				+7(2)	[241Am]	ABLRFS	ZP A330 235 (88)
2200	14 ms	unknown	-1.14(8) [I=2]			LRSRD	HFI 97/98 535 (96)
			-1.14(8) [I=3]			LRSRD	HFI 97/98 535 (96)

N. J. Stone, Table of Nuclear Magnetic Dipole and Electric Quadrupole Moments, to be published. 2000 Courtesy of T. Burrows at BNL/NNDC.