Krypton-69

Properties and data of the isotope ⁶⁹Kr.

Contents

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

General data

Name of the isotope:Krypton-69; Kr-69Symbol:⁶⁹Kr or 6936KrMass number A:69 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:33Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):0.91666666666667 (= neutron-proton ratio)Neutron excess (N-Z):-3Isotopic mass:68.96518(43) u (atomic weight of Krypton-69)Nuclide mass:68.9454319 u (calculated nuclear mass without electrons)Mass excess:-32.43462 MeVMass defect:0.60246337999999 u (per nucleus)Nuclear binding energy:561.19102369 MeV (per nucleus)
8.13320324 MeV (average binding energy per nucleon)Separation energy:
S_P = 0.93(48) MeV (first proton)Half-life:28(1) msDecay constant λ:24.755256448569 s^-1Specific activity α:2.192347667016 × 10⁺²³ Bq g^-1
5925263964910.3 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Isobaric spin: -3/2Mirror nucleus:Arsenic-69Year of discovery:1995

Radioactive Decay

Half-life T_½ = 28(1) ms respectively 2.8 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁶⁹Br		13.82(40) MeV
β⁺, p	⁶⁸Se	99 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 33) and isobaric (same nucleon number A = 69) with Krypton-69. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 33	Isobar A = 69
16	⁴⁹S
17	⁵⁰Cl
18	⁵¹Ar
19	⁵²K
20	⁵³Ca
21	⁵⁴Sc
22	⁵⁵Ti
23	⁵⁶V
24	⁵⁷Cr
25	⁵⁸Mn	⁶⁹Mn
26	⁵⁹Fe	⁶⁹Fe
27	⁶⁰Co	⁶⁹Co
28	⁶¹Ni	⁶⁹Ni
29	⁶²Cu	⁶⁹Cu
30	⁶³Zn	⁶⁹Zn
31	⁶⁴Ga	⁶⁹Ga
32	⁶⁵Ge	⁶⁹Ge
33	⁶⁶As	⁶⁹As
34	⁶⁷Se	⁶⁹Se
35	⁶⁸Br	⁶⁹Br
36	⁶⁹Kr	⁶⁹Kr