Chlorine-44

Properties and data of the isotope ⁴⁴Cl.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

Chlorine-44 is a radioisotope of the chemical element chlorine, which has 27 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 44. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ⁴⁴Cl is exclusively for academic purposes.

According to a report from 1979, the neutron-rich isotope chlorine-44 was discovered during the fragmentation of calcium-48 ions - accelerated to 212 MeV per nucleon - on a Be target [1].

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

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:27Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5882352941176 (= neutron-proton ratio)Neutron excess (N-Z):10Isotopic mass:43.97801(9) u (atomic weight of Chlorine-44)Nuclide mass:43.9686843 u (calculated nuclear mass without electrons)Mass excess:-20.48355 MeVMass defect:0.388968276 u (per nucleus)Nuclear binding energy:362.32161528 MeV (per nucleus)
8.23458217 MeV (average binding energy per nucleon)Separation energy:S_N = 4.391(106) MeV (first neutron)
S_P = 15.572(86) MeV (first proton)Half-life:0.54(11) sDecay constant λ:1.2836058899258 s^-1Specific activity α:1.757709216378 × 10⁺²² Bq g^-1
475056544967.16 Ci g^-1Spin and parity:
(nuclear angular momentum)(2-)Magnetic dipole moment:μ(μ_N) = -0.5498(4)Nuclear g-factor:g_l = -0.2749Year of discovery:1979

Radioactive Decay

Half-life T_½ = 0.54(11) s respectively 5.4 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁴Ar	> 92 %	12.19(9) MeV
β^-, n	⁴³Ar	< 8 %	3.460(86) 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.

Z	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

External data and identifiers

Adopted Levels, Gammas:NuDat 44Cl

Literature and References

[1] - G. D. Westfall, T. J. M. Symons, D. E. Greiner et al.:
Production of Neutron-Rich Nuclides by Fragmentation of 212-MeV/amu ⁴⁸Ca.
In: Physical Review Letters,43, 1859, (1979), DOI 10.1103/PhysRevLett.43.1859.