Polonium-207m2

Properties and data of the isotope ²⁰⁷Po.

Content

General data

Name of the isotope:Polonium-207m2; Po-207m2Symbol:²⁰⁷Po or 20784PoMass number A:207 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:123Isotopic mass:206.981593(7) u (atomic weight of Polonium-207m2)
Excitation energy: 1115.076(17) keVNuclide mass:206.9355177 u (calculated nuclear mass without electrons)Mass excess:-17.14601 MeVMass defect:1.741494356 u (per nucleus)Nuclear binding energy:1622.19154365 MeV (per nucleus)
7.83667412 MeV (average binding energy per nucleon)Half-life:49(4) μsDecay constant λ:14145.860827754 s^-1Specific activity α:4.13535759659 × 10⁺²⁵ Bq g^-1
1.117664215295 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)13/2+Magnetic dipole moment:μ(μ_N) = -0.910(14)Nuclear g-factor:g_l = -0.14

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
²⁰⁷Po		5.80(2) h	5/2-
^207m1Po	68.557(14) keV	205(10) ns	1/2-
^207m3Po		2.79(8) s	19/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 123) and isobaric (same nucleon number A = 207) with Polonium-207m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 123	Isobar A = 207
74	¹⁹⁷W
75	¹⁹⁸Re
76	¹⁹⁹Os
77	²⁰⁰Ir
78	²⁰¹Pt	²⁰⁷Pt
79	²⁰²Au	²⁰⁷Au
80	²⁰³Hg	²⁰⁷Hg
81	²⁰⁴Tl	²⁰⁷Tl
82	²⁰⁵Pb	²⁰⁷Pb
83	²⁰⁶Bi	²⁰⁷Bi
84	²⁰⁷Po	²⁰⁷Po
85	²⁰⁸At	²⁰⁷At
86	²⁰⁹Rn	²⁰⁷Rn
87	²¹⁰Fr	²⁰⁷Fr
88	²¹¹Ra	²⁰⁷Ra
89	²¹²Ac	²⁰⁷Ac
90	²¹³Th	²⁰⁷Th
91	²¹⁴Pa
92	²¹⁵U