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Rhenium-181

Properties and data of the isotope 181Re.


Content

See also: list of Rhenium isotopes.

 

General data

Name of the isotope:Rhenium-181; Re-181Symbol:181Re or 18175ReMass number A:181 (= number of nucleons)Atomic number Z:75 (= number of protons)Neutrons N:106Isotopic mass:180.950062(13) u (atomic weight of Rhenium-181)Nuclide mass:180.9089227 u (calculated nuclear mass without electrons)Mass excess:-46.51695 MeVMass defect:1.555296496 u (per nucleus)Nuclear binding energy:1448.74935425 MeV (per nucleus)
8.00414008 MeV (average binding energy per nucleon)
Separation energy:SN = 8.751(25) MeV (first neutron)
SP = 4.170(13) MeV (first proton)
Half-life:19.9(7) hDecay constant λ:9.675421280847 × 10-6 s-1Specific activity α:3.237041657360 × 10+16 Bq g-1
874876.12361105 Ci g-1
Spin and parity:
(nuclear angular momentum)
5/2+Magnetic dipole moment:μ(μN) = 3.19(7)Nuclear g-factor:gl = 1.276Year of discovery:1957

 

Radioactive Decay

Half-life T½ = 19.9(7) h (hours) respectively 7.1640 × 104 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+181W100 %1.716(13) MeV

 

Parent Nuclides

Direct parent isotope is: 181Os.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 181) with Rhenium-181. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 106Isobar A = 181
64170Gd
65171Tb
66172Dy
67173Ho
68174Er
69175Tm
70176Yb181Yb
71177Lu181Lu
72178Hf181Hf
73179Ta181Ta
74180W181W
75181Re181Re
76182Os181Os
77183Ir181Ir
78184Pt181Pt
79185Au181Au
80186Hg181Hg
81187Tl181Tl
82188Pb181Pb
83189Bi
84190Po
85191At

 

External data and identifiers

Adopted Levels, Gammas:NuDat 181Re

 


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Last update: 2020-10-21


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