Krypton-74

Properties and data of the isotope ⁷⁴Kr.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Krypton-74; Kr-74Symbol:⁷⁴Kr or 7436KrMass number A:74 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:38Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.0555555555556 (= neutron-proton ratio)Neutron excess (N-Z):2Isotopic mass:73.9330840(22) u (atomic weight of Krypton-74)Nuclide mass:73.9133359 u (calculated nuclear mass without electrons)Mass excess:-62.33185 MeVMass defect:0.67788396 u (per nucleus)Nuclear binding energy:631.44484144 MeV (per nucleus)
8.5330384 MeV (average binding energy per nucleon)Separation energy:S_N = 13.851(7) MeV (first neutron)
S_P = 5.973(8) MeV (first proton)Half-life:11.50(11) minDecay constant λ:0.0010045611312463 s^-1Specific activity α:8.287135116140 × 10⁺¹⁸ Bq g^-1
223976624.76056 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.1870(41) femtometer fmMirror nucleus:Strontium-74Year of discovery:1960

Radioactive Decay

Half-life T_½ = 11.50(11) min (minutes) respectively 6.90 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁴Br	100 %	2.956(6) MeV

Parent Nuclides

Direct parent isotopes are: ⁷⁴Rb, ⁷⁵Sr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 38) and isobaric (same nucleon number A = 74) with Krypton-74. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 38	Isobar A = 74
19	⁵⁷K
20	⁵⁸Ca
21	⁵⁹Sc
22	⁶⁰Ti
23	⁶¹V
24	⁶²Cr
25	⁶³Mn
26	⁶⁴Fe	⁷⁴Fe
27	⁶⁵Co	⁷⁴Co
28	⁶⁶Ni	⁷⁴Ni
29	⁶⁷Cu	⁷⁴Cu
30	⁶⁸Zn	⁷⁴Zn
31	⁶⁹Ga	⁷⁴Ga
32	⁷⁰Ge	⁷⁴Ge
33	⁷¹As	⁷⁴As
34	⁷²Se	⁷⁴Se
35	⁷³Br	⁷⁴Br
36	⁷⁴Kr	⁷⁴Kr
37	⁷⁵Rb	⁷⁴Rb
38	⁷⁶Sr	⁷⁴Sr
39	⁷⁷Y
40	⁷⁸Zr