Zinc-64

Properties and data of the isotope ⁶⁴Zn.

Contents

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

General data

Name of the isotope:Zinc-64; Zn-64Symbol:⁶⁴Zn or 6430ZnMass number A:64 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:34Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1333333333333 (= neutron-proton ratio)Neutron excess (N-Z):4Isotopic mass:63.929142(5) u (atomic weight of Zinc-64)Nuclide mass:63.9126851 u (calculated nuclear mass without electrons)Mass excess:-66.0038 MeVMass defect:0.60021610400001 u (per nucleus)Nuclear binding energy:559.09769958 MeV (per nucleus)
8.73590156 MeV (average binding energy per nucleon)Separation energy:S_N = 11.8619(15) MeV (first neutron)
S_P = 7.7132(6) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:3.9283(15) femtometer fmMirror nucleus:Selenium-64Year of discovery:1922

Parent Nuclides

Direct parent isotopes are: ⁶⁴Ga, ⁶⁴Cu.

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 = 34) and isobaric (same nucleon number A = 64) with Zinc-64. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 34	Isobar A = 64
17	⁵¹Cl
18	⁵²Ar
19	⁵³K
20	⁵⁴Ca
21	⁵⁵Sc
22	⁵⁶Ti	⁶⁴Ti
23	⁵⁷V	⁶⁴V
24	⁵⁸Cr	⁶⁴Cr
25	⁵⁹Mn	⁶⁴Mn
26	⁶⁰Fe	⁶⁴Fe
27	⁶¹Co	⁶⁴Co
28	⁶²Ni	⁶⁴Ni
29	⁶³Cu	⁶⁴Cu
30	⁶⁴Zn	⁶⁴Zn
31	⁶⁵Ga	⁶⁴Ga
32	⁶⁶Ge	⁶⁴Ge
33	⁶⁷As	⁶⁴As
34	⁶⁸Se	⁶⁴Se
35	⁶⁹Br
36	⁷⁰Kr
37	⁷¹Rb