Hafnium-178m2

Properties and data of the isotope ¹⁷⁸Hf.

Content

General data

Name of the isotope:Hafnium-178m2; Hf-178m2Symbol:¹⁷⁸Hf or 17872HfMass number A:178 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:106Isotopic mass:177.94371(2) u (atomic weight of Hafnium-178m2)
Excitation energy: 2446.09(8)Nuclide mass:177.904216 u (calculated nuclear mass without electrons)Mass excess:-52.4338 MeVMass defect:1.5381734 u (per nucleus)Nuclear binding energy:1432.79929306 MeV (per nucleus)
8.04943423 MeV (average binding energy per nucleon)Half-life:31(1) aDecay constant λ:7.090294400163 × 10^-10 s^-1Specific activity α:2412358848373 Bq g^-1
65.198887793865 Ci g^-1Spin and parity:
(nuclear angular momentum)16+

Radioactive Decay

Half-life T_½ = 31(1) a respectively 9.776 × 10⁸ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁷⁸Hf	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
¹⁷⁸Hf		stable	0+
^178m1Hf	1147.416(6) keV	4.0(2) s	8-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 178) with Hafnium-178m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 106	Isobar A = 178
64	¹⁷⁰Gd
65	¹⁷¹Tb
66	¹⁷²Dy
67	¹⁷³Ho
68	¹⁷⁴Er
69	¹⁷⁵Tm	¹⁷⁸Tm
70	¹⁷⁶Yb	¹⁷⁸Yb
71	¹⁷⁷Lu	¹⁷⁸Lu
72	¹⁷⁸Hf	¹⁷⁸Hf
73	¹⁷⁹Ta	¹⁷⁸Ta
74	¹⁸⁰W	¹⁷⁸W
75	¹⁸¹Re	¹⁷⁸Re
76	¹⁸²Os	¹⁷⁸Os
77	¹⁸³Ir	¹⁷⁸Ir
78	¹⁸⁴Pt	¹⁷⁸Pt
79	¹⁸⁵Au	¹⁷⁸Au
80	¹⁸⁶Hg	¹⁷⁸Hg
81	¹⁸⁷Tl	¹⁷⁸Tl
82	¹⁸⁸Pb	¹⁷⁸Pb
83	¹⁸⁹Bi
84	¹⁹⁰Po
85	¹⁹¹At