element

Information about Europium-139:


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

Mass-Energy Data:

Atomic Mass:	138.929838	±	0.000162	amu #
Excess Mass (Δ):	-65.355000	±	0.151000	MeV #
Binding Energy:	1137.981000	±	0.151000	MeV #
β^- Decay Energy:	-7.677000	±	0.525000	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: 11/2)-
Half life: 17.9 s ( 17.9 sec., λ = 0.0387233 s^-1)
Mode of decay:
E.C.
to
139
62
Sm
(Q = 6.700 MeV)
Possible parent nuclides:
E.C. +
1
1
p⁺ from
140
65
Tb

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	17.9s	(11/2-)	6.1(8)		[142Eu]	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.