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Chlorine-39

Properties and data of the isotope 39Cl.


Content

 

Chlorine-39 isotope

Chlorine-39 is a radioisotope of the chemical element chlorine, which, in addition to the element-specific 17 protons, has 22 neutrons in the atomic nucleus, resulting in the mass number 39. The very short-lived, unstable and therefore radioactive nuclide has no practical significance from a technical point of view.

39Cl is one of the cosmogenic nuclides that are continuously formed in the atmosphere by solar and cosmic radiation: The chlorine isotope is created by the interaction of slow negative muons μ- of cosmic rays with Argon-40 in the lower air layers. The trace radioisotope chlorine-39, which decays quickly into the stable isotope Ar-39, can be detected in small quantities in rainwater samples [2].

See also: list of Chlorine isotopes.

 

General data

Name of the isotope:Chlorine-39; Cl-39Symbol:39Cl or 3917ClMass number A:39 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:22Isotopic mass:38.9680082(19) u (atomic weight of Chlorine-39)Nuclide mass:38.9586825 u (calculated nuclear mass without electrons)Mass excess:-29.80017 MeVMass defect:0.355645496 u (per nucleus)Nuclear binding energy:331.28164565 MeV (per nucleus)
8.49440117 MeV (average binding energy per nucleon)
Separation energy:SN = 8.0734(17) MeV (first neutron)
SP = 10.228(7) MeV (first proton)
Half-life:56.2(6) minDecay constant λ:0.00020555966208777 s-1Specific activity α:3.257655895298 × 10+18 Bq g-1
88044753.926992 Ci g-1
Spin and parity:
(nuclear angular momentum)
3/2+Mirror nucleus:Titanium-39Year of discovery:1949

 

Radioactive Decay

Half-life T½ = 56.2(6) min (minutes) respectively 3.372 × 103 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-39Ar100 %3.44197 MeV

 

Parent Nuclides

Direct parent isotope is: 39S.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 22) and isobaric (same nucleon number A = 39) with Chlorine-39. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 22Isobar A = 39
931F
1032Ne
1133Na39Na
1234Mg39Mg
1335Al39Al
1436Si39Si
1537P39P
1638S39S
1739Cl39Cl
1840Ar39Ar
1941K39K
2042Ca39Ca
2143Sc39Sc
2244Ti39Ti
2345V
2446Cr
2547Mn
2648Fe
2749Co
2850Ni

 

External data and identifiers

Adopted Levels, Gammas:NuDat 39Cl

 

Literature and References

[1] - R. N. H. Haslam, L. Katz, H. E. Johns, H. J. Moody:
Confirmation of 39Cl Activity.
In: Physical Review, 76, 704, (1949), DOI 10.1103/PhysRev.76.704.

[2] - C. Papastefanou:
Chlorine-39 in rainfall at a temperate latitude (40°N).
In: Journal of Environmental Radioactivity, (2007), DOI 10.1016/j.jenvrad.2006.11.005.

 


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Last update: 2023-10-09


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