Zinc-70

Properties and data of the isotope ⁷⁰Zn.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Zinc-70; Zn-70Symbol:⁷⁰Zn or 7030ZnMass number A:70 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:40Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3333333333333 (= neutron-proton ratio)Neutron excess (N-Z):10Isotopic mass:69.92532(2) u (atomic weight of Zinc-70)Nuclide mass:69.9088631 u (calculated nuclear mass without electrons)Mass excess:-69.56397 MeVMass defect:0.6560276 u (per nucleus)Nuclear binding energy:611.08577323 MeV (per nucleus)
8.72979676 MeV (average binding energy per nucleon)Separation energy:S_N = 9.2182(20) MeV (first neutron)
S_P = 11.1175(24) MeV (first proton)Half-life:3.8 × 10¹⁸ aDecay constant λ:5.784092870970 × 10^-27 s^-1Specific activity α:5.048206089266 × 10^-5 Bq g^-1
1.364380024126 × 10^-15 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:3.9845(19) femtometer fmYear of discovery:1922

Radioactive Decay

Half-life T_½ = 3.8 × 10¹⁸ a respectively 1.198368 × 10²⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
2 β^-	⁷⁰Ge	100 %

Parent Nuclides

Direct parent isotopes are: ⁷⁰Cu, ⁷⁰Ga.

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 = 40) and isobaric (same nucleon number A = 70) with Zinc-70. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 40	Isobar A = 70
19	⁵⁹K
21	⁶¹Sc
22	⁶²Ti
23	⁶³V
24	⁶⁴Cr
25	⁶⁵Mn	⁷⁰Mn
26	⁶⁶Fe	⁷⁰Fe
27	⁶⁷Co	⁷⁰Co
28	⁶⁸Ni	⁷⁰Ni
29	⁶⁹Cu	⁷⁰Cu
30	⁷⁰Zn	⁷⁰Zn
31	⁷¹Ga	⁷⁰Ga
32	⁷²Ge	⁷⁰Ge
33	⁷³As	⁷⁰As
34	⁷⁴Se	⁷⁰Se
35	⁷⁵Br	⁷⁰Br
36	⁷⁶Kr	⁷⁰Kr
37	⁷⁷Rb
38	⁷⁸Sr
39	⁷⁹Y
40	⁸⁰Zr
41	⁸¹Nb
42	⁸²Mo