Krypton-79m
Properties and data of the isotope 79mKr.
See also: List of individual Krypton isotopes (and general data sources).
General data
Name of the isotope:Krypton-79m; Kr-79mSymbol:79mKr or 79m36KrMass number A:79 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:43Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1944444444444 (= neutron-proton ratio)Neutron excess (N-Z):7Excitation energy:129.77(5) keVIsotopic mass:78.920083(4) u (atomic weight of Krypton-79m)Nuclide mass:78.9003349 u (calculated nuclear mass without electrons)Mass excess:-74.44221 MeVMass defect:0.73420953999999 u (per nucleus)Nuclear binding energy:683.91178125 MeV (per nucleus)
8.65711116 MeV (average binding energy per nucleon)Half-life:50(3) sDecay constant λ:0.013862943611199 s-1Specific activity α:1.070315373846 × 10+20 Bq g-1
2892744253.6384 Ci g-1Spin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = - 0.786(2)Quadrupole moment Q:0.404(5) barn (100 fm2)Nuclear g-factor:gl = -0.22457142857143
Radioactive Decay
Half-life T½ = 50(3) s respectively 5.0 × 101 seconds s.
Decay
mode | Daughter | Probability | Decay energy | Details | γ energy
(intensity) |
|---|
| Iso | 79Kr | 100 % | 0.1299 MeV | 0.13001(2) MeV
27.7(6) % | |
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 |
|---|
| 79Kr | | 35.04(10) h | 1/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 79) with Krypton-79m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 43 | Isobar A = 79 |
|---|
| 22 | 65Ti | |
| 23 | 66V | |
| 24 | 67Cr | |
| 25 | 68Mn | |
| 26 | 69Fe | |
| 27 | 70Co | |
| 28 | 71Ni | 79Ni |
| 29 | 72Cu | 79Cu |
| 30 | 73Zn | 79Zn |
| 31 | 74Ga | 79Ga |
| 32 | 75Ge | 79Ge |
| 33 | 76As | 79As |
| 34 | 77Se | 79Se |
| 35 | 78Br | 79Br |
| 36 | 79Kr | 79Kr |
| 37 | 80Rb | 79Rb |
| 38 | 81Sr | 79Sr |
| 39 | 82Y | 79Y |
| 40 | 83Zr | 79Zr |
| 41 | 84Nb | |
| 42 | 85Mo | |
| 43 | 86Tc | |
| 44 | 87Ru | |
External data and identifiers
Last update: 2023-05-31
Perma link: https://www.chemlin.org/isotope/krypton-79m
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