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Chlorine-40

Properties and data of the isotope 40Cl.


Content

See also: list of Chlorine isotopes.

 

General data

Name of the isotope:Chlorine-40; Cl-40Symbol:40Cl or 4017ClMass number A:40 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:23Isotopic mass:39.97042(3) u (atomic weight of Chlorine-40)Nuclide mass:39.9610943 u (calculated nuclear mass without electrons)Mass excess:-27.55359 MeVMass defect:0.361898612 u (per nucleus)Nuclear binding energy:337.10638569 MeV (per nucleus)
8.42765964 MeV (average binding energy per nucleon)
Separation energy:SN = 5.83(3) MeV (first neutron)
SP = 8.4278(8) MeV (first proton)
Half-life:1.35(2) minDecay constant λ:0.00085573725995055 s-1Specific activity α:1.321377004748 × 10+19 Bq g-1
357128920.20224 Ci g-1
Spin and parity:
(nuclear angular momentum)
2-Mirror nucleus:Vanadium-40Year of discovery:1956

 

Radioactive Decay

Half-life T½ = 1.35(2) min (minutes) respectively 8.1 × 102 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-40Ar100 %7.48208 MeV

 

Parent Nuclides

Direct parent isotope is: 40S.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 23) and isobaric (same nucleon number A = 40) with Chlorine-40. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 23Isobar A = 40
1033Ne
1134Na
1235Mg40Mg
1336Al40Al
1437Si40Si
1538P40P
1639S40S
1740Cl40Cl
1841Ar40Ar
1942K40K
2043Ca40Ca
2144Sc40Sc
2245Ti40Ti
2346V40V
2447Cr
2548Mn
2649Fe
2750Co
2851Ni

 

External data and identifiers

Adopted Levels, Gammas:NuDat 40Cl

 


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Last update: 2023-10-04


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