Information about Einsteinium-254:


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Mass-Energy Data:

Atomic Mass:	254.088016	±	0.000005	amu
Excess Mass (Δ):	81.986388	±	0.004388	MeV
Binding Energy:	1890.676618	±	0.004402	MeV
β^- Decay Energy:	1.088200	±	0.003202	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+)
Half life: 275.7 days ( 2.38205×10⁺⁰⁷ sec., λ = 2.90988×10^-08 s^-1)
Mode of decay:
α
to
250
97
Bk
(Q = 6.618 MeV)
Mode of decay:
E.C.
to
254
98
Cf
(Q = 0 0.654 MeV) Branch ratio: <0.00010 %
Mode of decay: SF Branch ratio: <3.0E-6 %
Mode of decay:
β^-
to
254
100
Fm
(Q = 1.090 MeV) Branch ratio: 1.7E-6 %
Meta state at 0.078 Mev
Spin: 2+ 275.7
Half life: 39.3 h ( 141480 sec., λ = 4.89926×10^-06 s^-1)
Mode of decay:
β^-
to
254
100
Fm
(Q = 1.168 MeV) Branch ratio: 98.00 %
Mode of decay: γ (IT) to
254
99
Es
(Q = 0.078 MeV) Branch ratio: <3.00 %
Mode of decay:
α
to
250
97
Bk
(Q = 6.696 MeV) Branch ratio: 0.33 %
Mode of decay:
E.C.
to
254
98
Cf
(Q = 0.732 MeV) Branch ratio: 0.08 %
Mode of decay: SF Branch ratio: <0.05 %
Possible parent nuclides:
α from
258
101
Md

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
78	39.3 h	2+	2.90(7)		[253Es]	AB	PR A11 499 (75)
				3.7(5) st	[253Es]	AB	PR A11 499 (75)

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