Zinc-57

Properties and data of the isotope ⁵⁷Zn.

Contents

General data

Name of the isotope:Zinc-57; Zn-57Symbol:⁵⁷Zn or 5730ZnMass number A:57 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:27Isotopic mass:56.96506(21) u (atomic weight of Zinc-57)Nuclide mass:56.9486031 u (calculated nuclear mass without electrons)Mass excess:-32.5464 MeVMass defect:0.503643692 u (per nucleus)Nuclear binding energy:469.14107724 MeV (per nucleus)
8.23054521 MeV (average binding energy per nucleon)Separation energy:S_N = 15.23(45) MeV (first neutron)
S_P = 1.2(2) MeV (first proton)Half-life:40(10) msDecay constant λ:17.328679513999 s^-1Specific activity α:1.863495516964 × 10⁺²³ Bq g^-1
5036474370173.8 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Isobaric spin: 3/2Mirror nucleus:Cobalt-57Year of discovery:1976

Radioactive Decay

Half-life T_½ = 40(10) ms respectively 4.0 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	⁵⁷Cu	≤ 35 %	14.76(20) MeV
β⁺, p	⁵⁶Ni	≥ 65 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 27) and isobaric (same nucleon number A = 57) with Zinc-57. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 27	Isobar A = 57
11	³⁸Na
12	³⁹Mg
13	⁴⁰Al
14	⁴¹Si
15	⁴²P
16	⁴³S
17	⁴⁴Cl
18	⁴⁵Ar
19	⁴⁶K
20	⁴⁷Ca	⁵⁷Ca
21	⁴⁸Sc	⁵⁷Sc
22	⁴⁹Ti	⁵⁷Ti
23	⁵⁰V	⁵⁷V
24	⁵¹Cr	⁵⁷Cr
25	⁵²Mn	⁵⁷Mn
26	⁵³Fe	⁵⁷Fe
27	⁵⁴Co	⁵⁷Co
28	⁵⁵Ni	⁵⁷Ni
29	⁵⁶Cu	⁵⁷Cu
30	⁵⁷Zn	⁵⁷Zn
31	⁵⁸Ga
32	⁵⁹Ge