Krypton-67

Properties and data of the isotope ⁶⁷Kr.

Contents

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

General data

Name of the isotope:Krypton-67; Kr-67Symbol:⁶⁷Kr or 6736KrMass number A:67 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:31Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):0.86111111111111 (= neutron-proton ratio)Neutron excess (N-Z):-5Isotopic mass:66.98331(46) u (atomic weight of Krypton-67)Nuclide mass:66.9635619 u (calculated nuclear mass without electrons)Mass excess:-15.54663 MeVMass defect:0.56700354799999 u (per nucleus)Nuclear binding energy:528.16040294 MeV (per nucleus)
7.88299109 MeV (average binding energy per nucleon)Half-life:7.4(30) msDecay constant λ:93.668537913506 s^-1Specific activity α:8.546744385749 × 10⁺²³ Bq g^-1
23099309150674 Ci g^-1Spin and parity:
(nuclear angular momentum)Mirror nucleus:Gallium-67Year of discovery:2016

Radioactive Decay

Half-life T_½ = 7.4(30) ms respectively 7.4 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁶⁷Br	63(14) %
2p	⁶⁵Se	27(14) %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 31) and isobaric (same nucleon number A = 67) with Krypton-67. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 31	Isobar A = 67
15	⁴⁶P
16	⁴⁷S
17	⁴⁸Cl
18	⁴⁹Ar
19	⁵⁰K
20	⁵¹Ca
21	⁵²Sc
22	⁵³Ti
23	⁵⁴V	⁶⁷V
24	⁵⁵Cr	⁶⁷Cr
25	⁵⁶Mn	⁶⁷Mn
26	⁵⁷Fe	⁶⁷Fe
27	⁵⁸Co	⁶⁷Co
28	⁵⁹Ni	⁶⁷Ni
29	⁶⁰Cu	⁶⁷Cu
30	⁶¹Zn	⁶⁷Zn
31	⁶²Ga	⁶⁷Ga
32	⁶³Ge	⁶⁷Ge
33	⁶⁴As	⁶⁷As
34	⁶⁵Se	⁶⁷Se
35	⁶⁶Br	⁶⁷Br
36	⁶⁷Kr	⁶⁷Kr