Zinc-72

Properties and data of the isotope ⁷²Zn.

Contents

General data

Name of the isotope:Zinc-72; Zn-72Symbol:⁷²Zn or 7230ZnMass number A:72 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:42Isotopic mass:71.9268428(23) u (atomic weight of Zinc-72)Nuclide mass:71.9103859 u (calculated nuclear mass without electrons)Mass excess:-68.14549 MeVMass defect:0.671834632 u (per nucleus)Nuclear binding energy:625.8099287 MeV (per nucleus)
8.69180457 MeV (average binding energy per nucleon)Separation energy:S_N = 8.888(3) MeV (first neutron)
S_P = 12.7233(26) MeV (first proton)Half-life:46.5(1) hDecay constant λ:4.14066416105 × 10^-6 s^-1Specific activity α:3.51206518754 × 10⁺¹⁶ Bq g^-1
949206.80744351 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1951

Radioactive Decay

Half-life T_½ = 46.5(1) h (hours) respectively 1.67400 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷²Ga	100 %	0.4428(23) MeV

Parent Nuclides

Direct parent isotope is: ⁷²Cu.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 42) and isobaric (same nucleon number A = 72) with Zinc-72. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 42	Isobar A = 72
23	⁶⁵V
24	⁶⁶Cr
25	⁶⁷Mn
26	⁶⁸Fe	⁷²Fe
27	⁶⁹Co	⁷²Co
28	⁷⁰Ni	⁷²Ni
29	⁷¹Cu	⁷²Cu
30	⁷²Zn	⁷²Zn
31	⁷³Ga	⁷²Ga
32	⁷⁴Ge	⁷²Ge
33	⁷⁵As	⁷²As
34	⁷⁶Se	⁷²Se
35	⁷⁷Br	⁷²Br
36	⁷⁸Kr	⁷²Kr
37	⁷⁹Rb	⁷²Rb
38	⁸⁰Sr
39	⁸¹Y
40	⁸²Zr
41	⁸³Nb
42	⁸⁴Mo
43	⁸⁵Tc
44	⁸⁶Ru