Rhenium-163m

Properties and data of the isotope ¹⁶³Re.

Content

General data

Name of the isotope:Rhenium-163m; Re-163mSymbol:¹⁶³Re or 16375ReMass number A:163 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:88Isotopic mass:162.972085(20) u (atomic weight of Rhenium-163m)
Excitation energy: 115(4) keVNuclide mass:162.9309457 u (calculated nuclear mass without electrons)Mass excess:-26.00266 MeVMass defect:1.377305008 u (per nucleus)Nuclear binding energy:1282.95135112 MeV (per nucleus)
7.87086718 MeV (average binding energy per nucleon)Half-life:214(5) msDecay constant λ:3.2390055166353 s^-1Specific activity α:1.204058485635 × 10⁺²² Bq g^-1
325421212333.84 Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-

Radioactive Decay

Half-life T_½ = 214(5) ms respectively 2.14 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁵⁹Ta	66(4) %
EE/β⁺	¹⁶³W	34(4) %

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
¹⁶³Re		390(72) ms	1/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 163) with Rhenium-163m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 88	Isobar A = 163
49	¹³⁷In
50	¹³⁸Sn
51	¹³⁹Sb
52	¹⁴⁰Te
53	¹⁴¹I
54	¹⁴²Xe
55	¹⁴³Cs
56	¹⁴⁴Ba
57	¹⁴⁵La
58	¹⁴⁶Ce
59	¹⁴⁷Pr
60	¹⁴⁸Nd	¹⁶³Nd
61	¹⁴⁹Pm	¹⁶³Pm
62	¹⁵⁰Sm	¹⁶³Sm
63	¹⁵¹Eu	¹⁶³Eu
64	¹⁵²Gd	¹⁶³Gd
65	¹⁵³Tb	¹⁶³Tb
66	¹⁵⁴Dy	¹⁶³Dy
67	¹⁵⁵Ho	¹⁶³Ho
68	¹⁵⁶Er	¹⁶³Er
69	¹⁵⁷Tm	¹⁶³Tm
70	¹⁵⁸Yb	¹⁶³Yb
71	¹⁵⁹Lu	¹⁶³Lu
72	¹⁶⁰Hf	¹⁶³Hf
73	¹⁶¹Ta	¹⁶³Ta
74	¹⁶²W	¹⁶³W
75	¹⁶³Re	¹⁶³Re
76	¹⁶⁴Os	¹⁶³Os
77	¹⁶⁵Ir
78	¹⁶⁶Pt