Hafnium-177m1
Properties and data of the isotope 177m1Hf.
See also: List of individual Hafnium isotopes (and general data sources).
General data
Name of the isotope:Hafnium-177m1; Hf-177m1Symbol:177m1Hf or 177m172HfMass number A:177 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:105Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4583333333333 (= neutron-proton ratio)Neutron excess (N-Z):33Excitation energy:1315.4502(8) keVIsotopic mass:176.94323(2) u (atomic weight of Hafnium-177m1)Nuclide mass:176.903736 u (calculated nuclear mass without electrons)Mass excess:-52.88091 MeVMass defect:1.529988484 u (per nucleus)Nuclear binding energy:1425.17509292 MeV (per nucleus)
8.05183668 MeV (average binding energy per nucleon)Half-life:1.09(5) sDecay constant λ:0.63591484455041 s-1Specific activity α:2.175891345913 × 10+21 Bq g-1
58807874213.873 Ci g-1Spin and parity:
(nuclear angular momentum)23/2+
Radioactive Decay
Half-life T½ = 1.09(5) s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| Iso | 177Hf | 100 % | | |
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 |
|---|
| 177Hf | | stable | 7/2- |
| 177m2Hf | 1342.4(10) keV | 55.9(12) μs | (19/2-) |
| 177m3Hf | 2740.02(15) keV | 51.4(5) min | 37/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 105) and isobaric (same nucleon number A = 177) with Hafnium-177m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 105 | Isobar A = 177 |
|---|
| 63 | 168Eu | |
| 64 | 169Gd | |
| 65 | 170Tb | |
| 66 | 171Dy | |
| 67 | 172Ho | |
| 68 | 173Er | 177Er |
| 69 | 174Tm | 177Tm |
| 70 | 175Yb | 177Yb |
| 71 | 176Lu | 177Lu |
| 72 | 177Hf | 177Hf |
| 73 | 178Ta | 177Ta |
| 74 | 179W | 177W |
| 75 | 180Re | 177Re |
| 76 | 181Os | 177Os |
| 77 | 182Ir | 177Ir |
| 78 | 183Pt | 177Pt |
| 79 | 184Au | 177Au |
| 80 | 185Hg | 177Hg |
| 81 | 186Tl | 177Tl |
| 82 | 187Pb | |
| 83 | 188Bi | |
| 84 | 189Po | |
| 85 | 190At | |
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/hafnium-177m1
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