Krypton-73m

Properties and data of the isotope ^73mKr.

Contents

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

General data

Name of the isotope:Krypton-73m; Kr-73mSymbol:^73mKr or 73m36KrMass number A:73 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:37Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.0277777777778 (= neutron-proton ratio)Neutron excess (N-Z):1Excitation energy:433.55(13) keVIsotopic mass:72.939289(7) u (atomic weight of Krypton-73m)Nuclide mass:72.9195409 u (calculated nuclear mass without electrons)Mass excess:-56.55193 MeVMass defect:0.66301404399999 u (per nucleus)Nuclear binding energy:617.5936039 MeV (per nucleus)
8.46018635 MeV (average binding energy per nucleon)Half-life:107(10) nsDecay constant λ:6478011.0332705 s^-1Specific activity α:5.418263185358 × 10⁺²⁸ Bq g^-1
1.464395455502 × 10⁺¹⁸ Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)

Radioactive Decay

Half-life T_½ = 107(10) ns respectively 1.07 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁷³Kr	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
⁷³Kr		27.3(10) s	(3/2)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 37) and isobaric (same nucleon number A = 73) with Krypton-73m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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