Hafnium-164

Properties and data of the isotope ¹⁶⁴Hf.

Content

General data

Name of the isotope:Hafnium-164; Hf-164Symbol:¹⁶⁴Hf or 16472HfMass number A:164 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:92Isotopic mass:163.944371(17) u (atomic weight of Hafnium-164)Nuclide mass:163.904877 u (calculated nuclear mass without electrons)Mass excess:-51.81808 MeVMass defect:1.416203576 u (per nucleus)Nuclear binding energy:1319.18513382 MeV (per nucleus)
8.04381179 MeV (average binding energy per nucleon)Separation energy:S_N = 10.626(29) MeV (first neutron)
S_P = 4.32(3) MeV (first proton)Half-life:111(8) sDecay constant λ:0.0062445691942337 s^-1Specific activity α:2.30709664400 × 10⁺¹⁹ Bq g^-1
623539633.51514 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1981

Radioactive Decay

Half-life T_½ = 111(8) s respectively 1.11 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁶⁴Lu	100 %	2.82(3) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁶⁸W, ¹⁶⁴Ta.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 92) and isobaric (same nucleon number A = 164) with Hafnium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 92	Isobar A = 164
53	¹⁴⁵I
54	¹⁴⁶Xe
55	¹⁴⁷Cs
56	¹⁴⁸Ba
57	¹⁴⁹La
58	¹⁵⁰Ce
59	¹⁵¹Pr
60	¹⁵²Nd
61	¹⁵³Pm
62	¹⁵⁴Sm	¹⁶⁴Sm
63	¹⁵⁵Eu	¹⁶⁴Eu
64	¹⁵⁶Gd	¹⁶⁴Gd
65	¹⁵⁷Tb	¹⁶⁴Tb
66	¹⁵⁸Dy	¹⁶⁴Dy
67	¹⁵⁹Ho	¹⁶⁴Ho
68	¹⁶⁰Er	¹⁶⁴Er
69	¹⁶¹Tm	¹⁶⁴Tm
70	¹⁶²Yb	¹⁶⁴Yb
71	¹⁶³Lu	¹⁶⁴Lu
72	¹⁶⁴Hf	¹⁶⁴Hf
73	¹⁶⁵Ta	¹⁶⁴Ta
74	¹⁶⁶W	¹⁶⁴W
75	¹⁶⁷Re	¹⁶⁴Re
76	¹⁶⁸Os	¹⁶⁴Os
77	¹⁶⁹Ir	¹⁶⁴Ir
78	¹⁷⁰Pt
79	¹⁷¹Au
80	¹⁷²Hg