Krypton-75

Properties and data of the isotope ⁷⁵Kr.

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-75; Kr-75Symbol:⁷⁵Kr or 7536KrMass number A:75 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:39Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.0833333333333 (= neutron-proton ratio)Neutron excess (N-Z):3Isotopic mass:74.930946(9) u (atomic weight of Krypton-75)Nuclide mass:74.9111979 u (calculated nuclear mass without electrons)Mass excess:-64.32339 MeVMass defect:0.68868687599999 u (per nucleus)Nuclear binding energy:641.50769287 MeV (per nucleus)
8.5534359 MeV (average binding energy per nucleon)Separation energy:S_N = 10.063(8) MeV (first neutron)
S_P = 6.324(10) MeV (first proton)Half-life:4.60(7) minDecay constant λ:0.0025114028281157 s^-1Specific activity α:2.043786700940 × 10⁺¹⁹ Bq g^-1
552374784.03786 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μ_N) = - 0.531(4)Quadrupole moment Q:+ 1.12(12) barn (100 fm²)Nuclear g-factor:g_l = -0.2124Charge radius:4.2097(41) femtometer fmYear of discovery:1960

Radioactive Decay

Half-life T_½ = 4.60(7) min respectively 2.76 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁵Br	100 %	4.783(9) MeV

Parent Nuclides

Direct parent isotope is: ⁷⁵Rb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 39) and isobaric (same nucleon number A = 75) with Krypton-75. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 39	Isobar A = 75
19	⁵⁸K
21	⁶⁰Sc
22	⁶¹Ti
23	⁶²V
24	⁶³Cr
25	⁶⁴Mn
26	⁶⁵Fe
27	⁶⁶Co	⁷⁵Co
28	⁶⁷Ni	⁷⁵Ni
29	⁶⁸Cu	⁷⁵Cu
30	⁶⁹Zn	⁷⁵Zn
31	⁷⁰Ga	⁷⁵Ga
32	⁷¹Ge	⁷⁵Ge
33	⁷²As	⁷⁵As
34	⁷³Se	⁷⁵Se
35	⁷⁴Br	⁷⁵Br
36	⁷⁵Kr	⁷⁵Kr
37	⁷⁶Rb	⁷⁵Rb
38	⁷⁷Sr	⁷⁵Sr
39	⁷⁸Y
40	⁷⁹Zr
42	⁸¹Mo