Chlorine-44

Properties and data of the isotope ⁴⁴Cl.

Content

General data

Name of the isotope:Chlorine-44; Cl-44Symbol:⁴⁴Cl or 4417ClMass number A:44 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:27Isotopic mass:43.97812(15) u (atomic weight of Chlorine-44)Nuclide mass:43.9687943 u (calculated nuclear mass without electrons)Mass excess:-20.38109 MeVMass defect:0.388858276 u (per nucleus)Nuclear binding energy:362.21915094 MeV (per nucleus)
8.23225343 MeV (average binding energy per nucleon)Separation energy:S_N = 4.30(15) MeV (first neutron)
S_P = 15.48(15) MeV (first proton)Half-life:0.56(11) sDecay constant λ:1.2377628224285 s^-1Specific activity α:1.733484201827 × 10⁺²² Bq g^-1
468509243737.08 Ci g^-1Spin and parity:
(nuclear angular momentum)(2-)Magnetic dipole moment:μ(μ_N) = (-) 0.5498(4)Year of discovery:1979

Radioactive Decay

Half-life T_½ = 0.56(11) s respectively 5.6 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁴Ar	> 92 %	12.06806 MeV
β^-, n	⁴³Ar	< 8 %	3.33331 MeV

Parent Nuclides

Direct parent isotope is: ⁴⁴S.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 27) and isobaric (same nucleon number A = 44) with Chlorine-44. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 27	Isobar A = 44
11	³⁸Na
12	³⁹Mg
13	⁴⁰Al
14	⁴¹Si	⁴⁴Si
15	⁴²P	⁴⁴P
16	⁴³S	⁴⁴S
17	⁴⁴Cl	⁴⁴Cl
18	⁴⁵Ar	⁴⁴Ar
19	⁴⁶K	⁴⁴K
20	⁴⁷Ca	⁴⁴Ca
21	⁴⁸Sc	⁴⁴Sc
22	⁴⁹Ti	⁴⁴Ti
23	⁵⁰V	⁴⁴V
24	⁵¹Cr	⁴⁴Cr
25	⁵²Mn	⁴⁴Mn
26	⁵³Fe
27	⁵⁴Co
28	⁵⁵Ni
29	⁵⁶Cu
30	⁵⁷Zn
31	⁵⁸Ga
32	⁵⁹Ge