Hafnium-180

Properties and data of the isotope ¹⁸⁰Hf.

Content

General data

Name of the isotope:Hafnium-180; Hf-180Symbol:¹⁸⁰Hf or 18072HfMass number A:180 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:108Isotopic mass:179.94656(2) u (atomic weight of Hafnium-180)Nuclide mass:179.907066 u (calculated nuclear mass without electrons)Mass excess:-49.77904 MeVMass defect:1.552653232 u (per nucleus)Nuclear binding energy:1446.28716969 MeV (per nucleus)
8.03492872 MeV (average binding energy per nucleon)Separation energy:S_N = 7.38776(15) MeV (first neutron)
S_P = 8.009(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.3470(32) femtometer fmYear of discovery:1934

Parent Nuclides

Direct parent isotopes are: ¹⁸⁰Ta, ¹⁸⁰Lu.

Occurrence

Comparison of the natural Hafnium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Hafnium Isotopic mixture	178.486 u	100 %
Isotope ¹⁷⁴Hf	173.94005(2) u	0.16(12) %	2.0(4) × 10¹⁵ a	0+
Isotope ¹⁷⁶Hf	175.94141(2) u	5.26(70) %	stable	0+
Isotope ¹⁷⁷Hf	176.94323(2) u	18.60(16) %	stable	7/2-
Isotope ¹⁷⁸Hf	177.94371(2) u	27.28(28) %	stable	0+
Isotope ¹⁷⁹Hf	178.94582(2) u	13.62(11) %	stable	9/2+
Isotope ¹⁸⁰Hf	179.94656(2) u	35.08(33) %	stable	0+

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
^180mHf	1141.50(5)	5.53(2) h	8-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 108) and isobaric (same nucleon number A = 180) with Hafnium-180. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 108	Isobar A = 180
66	¹⁷⁴Dy
67	¹⁷⁵Ho
68	¹⁷⁶Er
69	¹⁷⁷Tm
70	¹⁷⁸Yb	¹⁸⁰Yb
71	¹⁷⁹Lu	¹⁸⁰Lu
72	¹⁸⁰Hf	¹⁸⁰Hf
73	¹⁸¹Ta	¹⁸⁰Ta
74	¹⁸²W	¹⁸⁰W
75	¹⁸³Re	¹⁸⁰Re
76	¹⁸⁴Os	¹⁸⁰Os
77	¹⁸⁵Ir	¹⁸⁰Ir
78	¹⁸⁶Pt	¹⁸⁰Pt
79	¹⁸⁷Au	¹⁸⁰Au
80	¹⁸⁸Hg	¹⁸⁰Hg
81	¹⁸⁹Tl	¹⁸⁰Tl
82	¹⁹⁰Pb	¹⁸⁰Pb
83	¹⁹¹Bi
84	¹⁹²Po
85	¹⁹³At
86	¹⁹⁴Rn