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Krypton-87

Properties and data of the isotope 87Kr.

Contents
General Data
Radioactive Decay
Parent Nuclides
Isotones und Isobares

See also: List of individual Krypton isotopes (and general data sources).

 

General data

Name of the isotope:Krypton-87; Kr-87Symbol:87Kr or 8736KrMass number A:87 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:51Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4166666666667 (= neutron-proton ratio)Neutron excess (N-Z):15Isotopic mass:86.91335476(26) u (atomic weight of Krypton-87)Nuclide mass:86.8936066 u (calculated nuclear mass without electrons)Mass excess:-80.70952 MeVMass defect:0.810257108 u (per nucleus)Nuclear binding energy:754.74963456 MeV (per nucleus)
8.67528316 MeV (average binding energy per nucleon)Separation energy:SN = 5.51517(25) MeV (first neutron)
SP = 12.366(3) MeV (first proton)Half-life:76.3(5) minDecay constant λ:0.00015140829632153 s-1Specific activity α:1.060234985827 × 10+18 Bq g-1
28654999.616949 Ci g-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μN) = - 1.022(2)Quadrupole moment Q:- 0.30(3) barn (100 fm2)Nuclear g-factor:gl = -0.4088Charge radius:4.1984(27) femtometer fmYear of discovery:1940

 

Radioactive Decay

Half-life T½ = 76.3(5) min (minutes) respectively 4.578 × 103 seconds s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
β-87Rb100 %3.88827(25) MeV

 

Parent Nuclides

Direct parent isotopes are: 87Br, 88Br.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 51) and isobaric (same nucleon number A = 87) with Krypton-87. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 51Isobar A = 87
2879Ni
2980Cu
3081Zn
3182Ga87Ga
3283Ge87Ge
3384As87As
3485Se87Se
3586Br87Br
3687Kr87Kr
3788Rb87Rb
3889Sr87Sr
3990Y87Y
4091Zr87Zr
4192Nb87Nb
4293Mo87Mo
4394Tc87Tc
4495Ru87Ru
4596Rh
4697Pd
4798Ag
4899Cd
49100In
50101Sn

 

External data and identifiers

Adopted Levels, Gammas:NuDat 87Kr

 

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Last update: 2020-10-14

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