Chlorine-43

Properties and data of the isotope ⁴³Cl.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

Chlorine-43 is a radioisotope of the chemical element chlorine, which has 26 neutrons in its atomic nucleus in addition to the element-specific 17 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 43. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ⁴³Cl is exclusively for academic purposes.

Chlorine-43 was first observed and characterized – according to a report from 1976 – by irradiating a calcium-48 template with helium-3 ions at an energy of 74 MeV [1]:

⁴⁸Ca(³He,⁸B)⁴³Cl.

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

General data

Name of the isotope:Chlorine-43; Cl-43Symbol:⁴³Cl or 4317ClMass number A:43 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:26Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.5294117647059 (= neutron-proton ratio)Neutron excess (N-Z):9Isotopic mass:42.97406(7) u (atomic weight of Chlorine-43)Nuclide mass:42.9647343 u (calculated nuclear mass without electrons)Mass excess:-24.16295 MeVMass defect:0.38425336 u (per nucleus)Nuclear binding energy:357.92969932 MeV (per nucleus)
8.3239465 MeV (average binding energy per nucleon)Separation energy:S_N = 7.399(86) MeV (first neutron)
S_P = 13.811(62) MeV (first proton)Half-life:3.13(9) sDecay constant λ:0.22145277334184 s^-1Specific activity α:3.175285225924 × 10⁺²¹ Bq g^-1
85818519619.573 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2+)Year of discovery:1976

Radioactive Decay

Half-life T_½ = 3.13(9) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴³Ar	100 %	7.85(6) MeV

Parent Nuclides

Direct parent isotopes are: ⁴³S, ⁴⁴S.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 26) and isobaric (same nucleon number A = 43) with Chlorine-43. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 26	Isobar A = 43
11	³⁷Na
12	³⁸Mg
13	³⁹Al	⁴³Al
14	⁴⁰Si	⁴³Si
15	⁴¹P	⁴³P
16	⁴²S	⁴³S
17	⁴³Cl	⁴³Cl
18	⁴⁴Ar	⁴³Ar
19	⁴⁵K	⁴³K
20	⁴⁶Ca	⁴³Ca
21	⁴⁷Sc	⁴³Sc
22	⁴⁸Ti	⁴³Ti
23	⁴⁹V	⁴³V
24	⁵⁰Cr	⁴³Cr
25	⁵¹Mn	⁴³Mn
26	⁵²Fe
27	⁵³Co
28	⁵⁴Ni
29	⁵⁵Cu
30	⁵⁶Zn

External data and identifiers

Adopted Levels, Gammas:NuDat 43Cl

Literature and References

[1] - E. Kashy, W. Benenson, D. Mueller, H. Nann, L. Robinson:
Observation of highly neutron-rich ⁴³Cl and ⁵⁹Mn.
In: Physical Review C, 14, 1774, (1976), DOI 10.1103/PhysRevC.14.1773.