Zinc-65

Properties and data of the isotope ⁶⁵Zn.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

Zinc-65 is a radioisotope of the chemical element zinc, which has 35 neutrons in its atomic nucleus in addition to the element-specific 30 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 65. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ⁶⁵Zn is exclusively for academic purposes or research.

Zinc-65 can, for example, be produced synthetically by irradiating enriched copper-65 or natural copper with protons (30 MeV):

⁶⁵Cu(p,n)⁶⁵Zn.

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

General data

Name of the isotope:Zinc-65; Zn-65Symbol:⁶⁵Zn or 6530ZnMass number A:65 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:35Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1666666666667 (= neutron-proton ratio)Neutron excess (N-Z):5Isotopic mass:64.9292405(7) u (atomic weight of Zinc-65)Nuclide mass:64.9127836 u (calculated nuclear mass without electrons)Mass excess:-65.91205 MeVMass defect:0.60878251999999 u (per nucleus)Nuclear binding energy:567.07726468 MeV (per nucleus)
8.72426561 MeV (average binding energy per nucleon)Separation energy:S_N = 7.97932(17) MeV (first neutron)
S_P = 7.7766(6) MeV (first proton)Half-life:243.93(9) dDecay constant λ:3.288868450 × 10^-8 s^-1Specific activity α:3.094692043831 × 10⁺¹⁴ Bq g^-1
8364.0325508951 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μ_N) = +0.7690(2)Quadrupole moment Q:- 0.023(2) barn (100 fm²)Nuclear g-factor:g_l = 0.3076Year of discovery:1939

Radioactive Decay

Half-life T_½ = 243.93(9) d respectively 2.1075552 × 10⁷ seconds s.

Decay mode	Daughter	Probability	Decay energy	Details	γ energy (intensity)
EC/β⁺	⁶⁵Cu	100 %	1.3517(9)	β⁺: 0.1425(3) MeV 1.421(7) %	1.115539(2) MeV 0.05004(10) %

Parent Nuclides

Direct parent isotope is: ⁶⁵Ga.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^65mZn	53.928(10) keV	1.6(6) μs	(1/2)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 35) and isobaric (same nucleon number A = 65) with Zinc-65. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 35	Isobar A = 65
17	⁵²Cl
18	⁵³Ar
19	⁵⁴K
20	⁵⁵Ca
21	⁵⁶Sc
22	⁵⁷Ti	⁶⁵Ti
23	⁵⁸V	⁶⁵V
24	⁵⁹Cr	⁶⁵Cr
25	⁶⁰Mn	⁶⁵Mn
26	⁶¹Fe	⁶⁵Fe
27	⁶²Co	⁶⁵Co
28	⁶³Ni	⁶⁵Ni
29	⁶⁴Cu	⁶⁵Cu
30	⁶⁵Zn	⁶⁵Zn
31	⁶⁶Ga	⁶⁵Ga
32	⁶⁷Ge	⁶⁵Ge
33	⁶⁸As	⁶⁵As
34	⁶⁹Se	⁶⁵Se
35	⁷⁰Br
36	⁷¹Kr
37	⁷²Rb
38	⁷³Sr