Zinc-66

Properties and data of the isotope ⁶⁶Zn.

Contents

See also: List of individual Zinc isotopes (and general data sources).

General data

Name of the isotope:Zinc-66; Zn-66Symbol:⁶⁶Zn or 6630ZnMass number A:66 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:36Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.2 (= neutron-proton ratio)Neutron excess (N-Z):6Isotopic mass:65.926034(6) u (atomic weight of Zinc-66)Nuclide mass:65.9095771 u (calculated nuclear mass without electrons)Mass excess:-68.89889 MeVMass defect:0.62065393600001 u (per nucleus)Nuclear binding energy:578.13541746 MeV (per nucleus)
8.75962754 MeV (average binding energy per nucleon)Separation energy:S_N = 11.0585(9) MeV (first neutron)
S_P = 8.9245(9) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:3.9491(14) femtometer fmYear of discovery:1922

Parent Nuclides

Direct parent isotopes are: ⁶⁶Ga, ⁶⁶Cu.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Zinc Isotopic mixture	65.38 u	100 %
Isotope ⁶⁴Zn	63.929142(5) u	49.17(75) %	stable	0+
Isotope ⁶⁶Zn	65.926034(6) u	27.73(98) %	stable	0+
Isotope ⁶⁸Zn	67.924845(6) u	18.45(63) %	stable	0+
Isotope ⁷⁰Zn	69.92532(2) u	0.61(10) %	3.8 × 10¹⁸ a	0+
Isotope ⁶⁷Zn	66.9271274(8) u	4.04(16) %	stable	5/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 36) and isobaric (same nucleon number A = 66) with Zinc-66. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 36	Isobar A = 66
18	⁵⁴Ar
19	⁵⁵K
20	⁵⁶Ca
21	⁵⁷Sc
22	⁵⁸Ti	⁶⁶Ti
23	⁵⁹V	⁶⁶V
24	⁶⁰Cr	⁶⁶Cr
25	⁶¹Mn	⁶⁶Mn
26	⁶²Fe	⁶⁶Fe
27	⁶³Co	⁶⁶Co
28	⁶⁴Ni	⁶⁶Ni
29	⁶⁵Cu	⁶⁶Cu
30	⁶⁶Zn	⁶⁶Zn
31	⁶⁷Ga	⁶⁶Ga
32	⁶⁸Ge	⁶⁶Ge
33	⁶⁹As	⁶⁶As
34	⁷⁰Se	⁶⁶Se
35	⁷¹Br	⁶⁶Br
36	⁷²Kr
37	⁷³Rb
38	⁷⁴Sr