element

Information about Ytterbium-157:


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

Mass-Energy Data:

Atomic Mass:	156.942659	±	0.000055	amu
Excess Mass (Δ):	-53.413115	±	0.051237	MeV
Binding Energy:	1265.846058	±	0.051237	MeV
β^- Decay Energy:	-6.933002	±	0.053463	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: 38.6 s ( 38.6 sec., λ = 0.0179572 s^-1)
Mode of decay:
E.C.
to
157
69
Tm
(Q = 5.500 MeV) Branch ratio: 99.50 %
Mode of decay:
α
to
153
68
Er
(Q = 4.620 MeV) Branch ratio: 0.50 %
Possible parent nuclides:
E.C. from
157
71
Lu

α from
161
72
Hf

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	38.6 s	7/2-	-0.639(8)		[171Yb]	CFBLS	HFI 74 171 (92)
494 + x	45 ns	13/2+	-0.75(8)			TDPAD	PR C30 169 (84)

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