Rhenium-189

Properties and data of the isotope ¹⁸⁹Re.

Contents

General data

Name of the isotope:Rhenium-189; Re-189Symbol:¹⁸⁹Re or 18975ReMass number A:189 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:114Isotopic mass:188.959228(9) u (atomic weight of Rhenium-189)Nuclide mass:188.9180887 u (calculated nuclear mass without electrons)Mass excess:-37.97887 MeVMass defect:1.615449824 u (per nucleus)Nuclear binding energy:1504.78181836 MeV (per nucleus)
7.96180856 MeV (average binding energy per nucleon)Separation energy:S_N = 7.034(8) MeV (first neutron)
S_P = 6.600(9) MeV (first proton)Half-life:24.3(4) hDecay constant λ:7.923493147690 × 10^-6 s^-1Specific activity α:2.538105948836 × 10⁺¹⁶ Bq g^-1
685974.58076673 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Year of discovery:1963

Radioactive Decay

Half-life T_½ = 24.3(4) h (hours) respectively 8.7480 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁸⁹Os	100 %	1.008(8) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸⁹W.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 114) and isobaric (same nucleon number A = 189) with Rhenium-189. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 114	Isobar A = 189
70	¹⁸⁴Yb
71	¹⁸⁵Lu
72	¹⁸⁶Hf	¹⁸⁹Hf
73	¹⁸⁷Ta	¹⁸⁹Ta
74	¹⁸⁸W	¹⁸⁹W
75	¹⁸⁹Re	¹⁸⁹Re
76	¹⁹⁰Os	¹⁸⁹Os
77	¹⁹¹Ir	¹⁸⁹Ir
78	¹⁹²Pt	¹⁸⁹Pt
79	¹⁹³Au	¹⁸⁹Au
80	¹⁹⁴Hg	¹⁸⁹Hg
81	¹⁹⁵Tl	¹⁸⁹Tl
82	¹⁹⁶Pb	¹⁸⁹Pb
83	¹⁹⁷Bi	¹⁸⁹Bi
84	¹⁹⁸Po	¹⁸⁹Po
85	¹⁹⁹At
86	²⁰⁰Rn
87	²⁰¹Fr
88	²⁰²Ra
89	²⁰³Ac