Information about Protactinium-231:


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Mass-Energy Data:

Atomic Mass:	231.035879	±	0.000003	amu
Excess Mass (Δ):	33.420973	±	0.002586	MeV
Binding Energy:	1759.860436	±	0.002605	MeV
β^- Decay Energy:	-0.382155	±	0.003220	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: 3/2-
Half life: 32760 years ( 1.03325×10⁺¹² sec., λ = 6.70841×10^-13 s^-1)
Mode of decay:
α
to
227
89
Ac
(Q = 5.149 MeV)
Mode of decay: 24NEC Branch ratio: 13E-10 %
Mode of decay: SF Branch ratio: <=3E-10 %
Possible parent nuclides:
β^- from
231
90
Th

E.C. from
231
92
U

α from
235
93
Np

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	3.3x10*4y	(2-)	2.01(2)			ENDOR	PR 121 1630 (61)
84	44 ns	5/2+		+0.7(2)	[231Pa]	ME	PL 69A 225 (78)

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