Information about Cesium-138:


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

Mass-Energy Data:

Atomic Mass:	137.911011	±	0.000010	amu
Excess Mass (Δ):	-82.893139	±	0.009572	MeV
Binding Energy:	1153.706249	±	0.009574	MeV
β^- Decay Energy:	5.374034	±	0.009095	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-
Half life: 33.41 min ( 2004.6 sec., λ = 0.000345778 s^-1)
Mode of decay:
β^-
to
138
56
Ba
(Q = 5.373 MeV)
Meta state at 0.080 Mev
Spin: 6- 33.41
Half life: 2.91 min ( 174.6 sec., λ = 0.00396992 s^-1)
Mode of decay: γ (IT) (Q = 0.080 MeV) Branch ratio: 81.00 %
Mode of decay:
β^-
to
138
56
Ba
(Q = 5.453 MeV) Branch ratio: 19.00 %
Possible parent nuclides:
β^- from
138
54
Xe

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	32.2 m	3-	+0.700(4)		[133Cs]	ABLS	NP A367 1 (81)
			+0.701(7)		[133Cs]	AB	PS 19 516 (79)
			+0.701(14)		[133Cs]	CFBLS	ZP A289 227 (79)
				+0.13(2) st		CFBLS	ZP A289 227 (79)
				+0.12(2) st		ABLS	NP A367 1 (81)
80	2.9 m	6-	+1.713(9)		[133Cs]	ABLS	NP A367 1 (81)
				-0.40(3)		ABLS	NP A367 1 (81)

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