Information about Cerium-139:


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

Mass-Energy Data:

Atomic Mass:	138.906647	±	0.000008	amu
Excess Mass (Δ):	-86.958114	±	0.007703	MeV
Binding Energy:	1163.495487	±	0.007706	MeV
β^- Decay Energy:	-2.129000	±	0.003000	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: 3/2+
Half life: 137.640 days ( 1.18921×10⁺⁰⁷ sec., λ = 5.82864×10^-08 s^-1)
Mode of decay:
E.C.
to
139
57
La
(Q = 0.278 MeV)
Meta state at 0.754 Mev
Spin: 11/2- 137.640
Half life: 54.8 s ( 54.8 sec., λ = 0.0126487 s^-1)
Mode of decay: γ (IT) (Q = 0.754 MeV)
Possible parent nuclides:
E.C. from
139
59
Pr

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	137.6 d	3/2+	1.06(4)			NMR/ON	JPJa 60 845 (91)
			1.0(2)			NO/S	PR 129 1601 (63)
			0.85(15)			NO/S	PhMg 7 1087 (62)
2632	70 ns	19/2-	+3.99(6)			TDPAD	PRL 45 1015 (80)
			+3.85(8)			TDPAD	YadF 40 289 (84)

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