Hafnium-163

Properties and data of the isotope ¹⁶³Hf.

Content

General data

Name of the isotope:Hafnium-163; Hf-163Symbol:¹⁶³Hf or 16372HfMass number A:163 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:91Isotopic mass:162.947113(27) u (atomic weight of Hafnium-163)Nuclide mass:162.907619 u (calculated nuclear mass without electrons)Mass excess:-49.26392 MeVMass defect:1.40479666 u (per nucleus)Nuclear binding energy:1308.55966001 MeV (per nucleus)
8.02797337 MeV (average binding energy per nucleon)Separation energy:S_N = 8.166(26) MeV (first neutron)
S_P = 3.72(8) MeV (first proton)Half-life:40.0(6) sDecay constant λ:0.017328679513999 s^-1Specific activity α:6.441712898148 × 10⁺¹⁹ Bq g^-1
1741003485.986 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Year of discovery:1982

Radioactive Decay

Half-life T_½ = 40.0(6) s respectively 4.0 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁶³Lu	> 99.9998 %	5.53(4) MeV
α	¹⁵⁹Yb	< 0.0001 %	4.15(3) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁶⁷W, ¹⁶³Ta.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 163) with Hafnium-163. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 91	Isobar A = 163
52	¹⁴³Te
53	¹⁴⁴I
54	¹⁴⁵Xe
55	¹⁴⁶Cs
56	¹⁴⁷Ba
57	¹⁴⁸La
58	¹⁴⁹Ce
59	¹⁵⁰Pr
60	¹⁵¹Nd	¹⁶³Nd
61	¹⁵²Pm	¹⁶³Pm
62	¹⁵³Sm	¹⁶³Sm
63	¹⁵⁴Eu	¹⁶³Eu
64	¹⁵⁵Gd	¹⁶³Gd
65	¹⁵⁶Tb	¹⁶³Tb
66	¹⁵⁷Dy	¹⁶³Dy
67	¹⁵⁸Ho	¹⁶³Ho
68	¹⁵⁹Er	¹⁶³Er
69	¹⁶⁰Tm	¹⁶³Tm
70	¹⁶¹Yb	¹⁶³Yb
71	¹⁶²Lu	¹⁶³Lu
72	¹⁶³Hf	¹⁶³Hf
73	¹⁶⁴Ta	¹⁶³Ta
74	¹⁶⁵W	¹⁶³W
75	¹⁶⁶Re	¹⁶³Re
76	¹⁶⁷Os	¹⁶³Os
77	¹⁶⁸Ir
78	¹⁶⁹Pt
79	¹⁷⁰Au
80	¹⁷¹Hg