element

Information about Samarium-139:


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

Mass-Energy Data:

Atomic Mass:	138.922302	±	0.000016	amu
Excess Mass (Δ):	-72.375210	±	0.014904	MeV
Binding Energy:	1145.783169	±	0.014905	MeV
β^- Decay Energy:	-7.020000	±	0.150000	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: (1/2)+
Half life: 2.57 min ( 154.2 sec., λ = 0.00449512 s^-1)
Mode of decay:
E.C.
to
139
61
Pm
(Q = 5.460 MeV)
Meta state at 0.458 Mev
Spin: 11/2)- 2.57
Half life: 10.7 s ( 10.7 sec., λ = 0.0647801 s^-1)
Mode of decay: γ (IT) (Q = 0.458 MeV) Branch ratio: 93.70 %
Mode of decay:
E.C.
to
139
61
Pm
(Q = 5.918 MeV) Branch ratio: 6.30 %
Possible parent nuclides:
E.C. from
139
63
Eu

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	2.57 m	1/2+	-0.53(2)		"[145,7,9Sm]"	LRIMS	JP G18 1177 (92)
457	10.7 s	11/2-	1.1(2)		[141Sm176]	NO/S	HFI 75 471 (92)

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