Rhenium-164

Properties and data of the isotope ¹⁶⁴Re.

Contents

General data

Name of the isotope:Rhenium-164; Re-164Symbol:¹⁶⁴Re or 16475ReMass number A:164 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:89Isotopic mass:163.97051(6) u (atomic weight of Rhenium-164)Nuclide mass:163.9293707 u (calculated nuclear mass without electrons)Mass excess:-27.46976 MeVMass defect:1.387544924 u (per nucleus)Nuclear binding energy:1292.48977144 MeV (per nucleus)
7.88103519 MeV (average binding energy per nucleon)Separation energy:S_N = 9.54(6) MeV (first neutron)Half-life:0.70(16) sDecay constant λ:0.99021025794278 s^-1Specific activity α:3.658396106923 × 10⁺²¹ Bq g^-1
98875570457.397 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1979

Radioactive Decay

Half-life T_½ = 0.70(16) s respectively 7.0 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁰Ta	ca. 58 %	5.926(5) MeV
EC/β⁺	¹⁶⁴W	ca. 42 %	10.76(6) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶⁸Ir.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 89) and isobaric (same nucleon number A = 164) with Rhenium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 89	Isobar A = 164
50	¹³⁹Sn
51	¹⁴⁰Sb
52	¹⁴¹Te
53	¹⁴²I
54	¹⁴³Xe
55	¹⁴⁴Cs
56	¹⁴⁵Ba
57	¹⁴⁶La
58	¹⁴⁷Ce
59	¹⁴⁸Pr
60	¹⁴⁹Nd
61	¹⁵⁰Pm
62	¹⁵¹Sm	¹⁶⁴Sm
63	¹⁵²Eu	¹⁶⁴Eu
64	¹⁵³Gd	¹⁶⁴Gd
65	¹⁵⁴Tb	¹⁶⁴Tb
66	¹⁵⁵Dy	¹⁶⁴Dy
67	¹⁵⁶Ho	¹⁶⁴Ho
68	¹⁵⁷Er	¹⁶⁴Er
69	¹⁵⁸Tm	¹⁶⁴Tm
70	¹⁵⁹Yb	¹⁶⁴Yb
71	¹⁶⁰Lu	¹⁶⁴Lu
72	¹⁶¹Hf	¹⁶⁴Hf
73	¹⁶²Ta	¹⁶⁴Ta
74	¹⁶³W	¹⁶⁴W
75	¹⁶⁴Re	¹⁶⁴Re
76	¹⁶⁵Os	¹⁶⁴Os
77	¹⁶⁶Ir	¹⁶⁴Ir
78	¹⁶⁷Pt