Information about Lanthanum-138:


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Mass-Energy Data:

Atomic Mass:	137.907107	±	0.000004	amu
Excess Mass (Δ):	-86.529421	±	0.004118	MeV
Binding Energy:	1155.777825	±	0.004122	MeV
β^- Decay Energy:	1.044439	±	0.010580	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:

Atomic Percent Abundance: 0.0902%
Spin: 5+
Half life: 1.05E+11 years ( 3.3117×10⁺¹⁸ sec., λ = 2.09303×10^-19 s^-1)
Mode of decay:
E.C.
to
138
56
Ba
(Q = 1.737 MeV) Branch ratio: 66.40 %
Mode of decay:
β^-
to
138
58
Ce
(Q = 1.044 MeV) Branch ratio: 33.60 %

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	1.1x10*11 y	5+	+3.713646(7)		[139La]	N	PL 62A 131 (77)/PR 99 613 (55)
				+0.45(2) st	[139La]	ABLDF	PR A20 1922 (79)
				0.43(2) st	[139La]	QIR	PL 62A 131 (77)
73	116 ns	3+	+2.89(5)		[19F 197]	TDPAD	ZP A291 49 (79)

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