Krypton-76

Properties and data of the isotope ⁷⁶Kr.

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-76; Kr-76Symbol:⁷⁶Kr or 7636KrMass number A:76 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:40Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1111111111111 (= neutron-proton ratio)Neutron excess (N-Z):4Isotopic mass:75.925911(4) u (atomic weight of Krypton-76)Nuclide mass:75.9061629 u (calculated nuclear mass without electrons)Mass excess:-69.01346 MeVMass defect:0.702386792 u (per nucleus)Nuclear binding energy:654.26908243 MeV (per nucleus)
8.60880372 MeV (average binding energy per nucleon)Separation energy:S_N = 12.761(9) MeV (first neutron)
S_P = 7.196(6) MeV (first proton)Half-life:14.8(1) hDecay constant λ:1.300951915465 × 10^-5 s^-1Specific activity α:1.044602091591 × 10⁺¹⁷ Bq g^-1
2823248.8961935 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.2020(36) femtometer fmYear of discovery:1954

Radioactive Decay

Half-life T_½ = 14.8(1) h (hours) respectively 5.3280 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁶Br	100 %	1.275(10) MeV

Parent Nuclides

Direct parent isotopes are: ⁷⁶Rb, ⁷⁷Sr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 40) and isobaric (same nucleon number A = 76) with Krypton-76. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 40	Isobar A = 76
19	⁵⁹K
21	⁶¹Sc
22	⁶²Ti
23	⁶³V
24	⁶⁴Cr
25	⁶⁵Mn
26	⁶⁶Fe
27	⁶⁷Co	⁷⁶Co
28	⁶⁸Ni	⁷⁶Ni
29	⁶⁹Cu	⁷⁶Cu
30	⁷⁰Zn	⁷⁶Zn
31	⁷¹Ga	⁷⁶Ga
32	⁷²Ge	⁷⁶Ge
33	⁷³As	⁷⁶As
34	⁷⁴Se	⁷⁶Se
35	⁷⁵Br	⁷⁶Br
36	⁷⁶Kr	⁷⁶Kr
37	⁷⁷Rb	⁷⁶Rb
38	⁷⁸Sr	⁷⁶Sr
39	⁷⁹Y	⁷⁶Y
40	⁸⁰Zr
41	⁸¹Nb
42	⁸²Mo