Bismuth-187
Properties and data of the isotope 187Bi.
See also: list of Bismuth isotopes.
General data
Name of the isotope:Bismuth-187; Bi-187Symbol:187Bi or 18783BiMass number A:187 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:104Isotopic mass:186.993147(11) u (atomic weight of Bismuth-187)Nuclide mass:186.9476201 u (calculated nuclear mass without electrons)Mass excess:-6.38353 MeVMass defect:1.55748192 u (per nucleus)Nuclear binding energy:1450.78506359 MeV (per nucleus)
7.7582089 MeV (average binding energy per nucleon)Separation energy:SN = 11.308(20) MeV (first neutron)
SP = -1.010(15) MeV (first proton)Half-life:37(2) msDecay constant λ:18.733707582701 s-1Specific activity α:6.065431499564 × 10+22 Bq g-1
1639305810693 Ci g-1Spin and parity:
(nuclear angular momentum)(9/2-)Year of discovery:1999
Radioactive Decay
Half-life T½ = 37(2) ms respectively 3.7 × 10-2 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| α | 183Tl | 100 % | 7.779(4) MeV | |
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 |
|---|
| 187m1Bi | 112(20) keV | 0.370(20) ms | (1/2+) |
| 187m2Bi | 252 keV | 3.2 μs | (13/2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 104) and isobaric (same nucleon number A = 187) with Bismuth-187. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 104 | Isobar A = 187 |
|---|
| 62 | 166Sm | |
| 63 | 167Eu | |
| 64 | 168Gd | |
| 65 | 169Tb | |
| 66 | 170Dy | |
| 67 | 171Ho | |
| 68 | 172Er | |
| 69 | 173Tm | |
| 70 | 174Yb | |
| 71 | 175Lu | 187Lu |
| 72 | 176Hf | 187Hf |
| 73 | 177Ta | 187Ta |
| 74 | 178W | 187W |
| 75 | 179Re | 187Re |
| 76 | 180Os | 187Os |
| 77 | 181Ir | 187Ir |
| 78 | 182Pt | 187Pt |
| 79 | 183Au | 187Au |
| 80 | 184Hg | 187Hg |
| 81 | 185Tl | 187Tl |
| 82 | 186Pb | 187Pb |
| 83 | 187Bi | 187Bi |
| 84 | 188Po | 187Po |
External data and identifiers
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/bismuth-187
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