Information about Lanthanum-137:


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

Mass-Energy Data:

Atomic Mass:	136.906466	±	0.000051	amu
Excess Mass (Δ):	-87.126667	±	0.047782	MeV
Binding Energy:	1148.303748	±	0.047783	MeV
β^- Decay Energy:	-1.222100	±	0.001600	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: 7/2+
Half life: 60000 years ( 1.8924×10⁺¹² sec., λ = 3.66279×10^-13 s^-1)
Mode of decay:
E.C.
to
137
56
Ba
(Q = 0.600 MeV)
Possible parent nuclides:
E.C. from
137
58
Ce

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	6 x 10*4 y	7/2+	+2.695(6)		[139La]	O	ZP 254 127 (72)
				+0.26(8) st	[139La]	O	ZP 254 127 (72)
10	89 ns	5/2+		+0.26(8) st	[137La]	ME	HFI 4 630 (78)
1870	365 ns	19/2-	+2.34(6)			TDPAD	BAPS 27 728 (82)

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