Zinc-67m2

Properties and data of the isotope ^67m2Zn.

Contents

Zinc-67m2 is an excited nuclear state of the nuclide ⁶⁷Zn, characterized by a defined excitation energy of 604.48 keV. Its spin and parity quantum numbers differ from those of the ground state (gs). Simultaneously, this metastable nuclear isomer possesses an independent, experimentally measurable lifetime: decay occurs via an isomeric transition to Zn-67 in the ground state with a half-life of approximately 333 nanoseconds.

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

General data

Name of the isotope:Zinc-67m2; Zn-67m2Symbol:^67m2Zn or 67m230ZnMass number A:67 (= number of nucleons)Atomic number Z:30 (= number of protons)Neutrons N:37Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2333333333333 (= neutron-proton ratio)Neutron excess (N-Z):7Excitation energy:604.48(5) keVIsotopic mass:66.9271274(8) u (atomic weight of Zinc-67m2)Nuclide mass:66.9106705 u (calculated nuclear mass without electrons)Mass excess:-67.88039 MeVMass defect:0.628225452 u (per nucleus)Nuclear binding energy:585.18823919 MeV (per nucleus)
8.73415282 MeV (average binding energy per nucleon)Half-life:333(14) nsDecay constant λ:2081523.0647446 s^-1Specific activity α:1.899276530166 × 10⁺²⁸ Bq g^-1
5.133179811260 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μ_N) = -1.097(9)Quadrupole moment Q:0.60(6) barn (100 fm²)Nuclear g-factor:g_l = -0.24377777777778Year of discovery:1973

Radioactive Decay

Half-life T_½ = 333(14) ns respectively 3.33 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁶⁷Zn	100 %

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
⁶⁷Zn		stable	5/2-
^67m1Zn	93.312(5) keV	9.15(7) μs	1/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 37) and isobaric (same nucleon number A = 67) with Zinc-67m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 37	Isobar A = 67
19	⁵⁶K
20	⁵⁷Ca
21	⁵⁸Sc
22	⁵⁹Ti
23	⁶⁰V	⁶⁷V
24	⁶¹Cr	⁶⁷Cr
25	⁶²Mn	⁶⁷Mn
26	⁶³Fe	⁶⁷Fe
27	⁶⁴Co	⁶⁷Co
28	⁶⁵Ni	⁶⁷Ni
29	⁶⁶Cu	⁶⁷Cu
30	⁶⁷Zn	⁶⁷Zn
31	⁶⁸Ga	⁶⁷Ga
32	⁶⁹Ge	⁶⁷Ge
33	⁷⁰As	⁶⁷As
34	⁷¹Se	⁶⁷Se
35	⁷²Br	⁶⁷Br
36	⁷³Kr	⁶⁷Kr
37	⁷⁴Rb
38	⁷⁵Sr
39	⁷⁶Y
40	⁷⁷Zr