Chlorine-32

Properties and data of the isotope ³²Cl.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

Chlorine-32 is a radioisotope of the chemical element chlorine, which has 15 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 32. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ³²Cl is exclusively for academic purposes.

The isotope chlorine was first produced by the charge exchange reaction ³²S(p,n)³²Cl during the irradiation of natural S samples with protons accelerated to 20 MeV [1, (1953)].

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

General data

Name of the isotope:Chlorine-32; Cl-32Symbol:³²Cl or 3217ClMass number A:32 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:15Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):0.88235294117647 (= neutron-proton ratio)Neutron excess (N-Z):-2Isotopic mass:31.9856846(6) u (atomic weight of Chlorine-32)Nuclide mass:31.9763589 u (calculated nuclear mass without electrons)Mass excess:-13.33471 MeVMass defect:0.277314684 u (per nucleus)Nuclear binding energy:258.31696426 MeV (per nucleus)
8.07240513 MeV (average binding energy per nucleon)Separation energy:S_N = 14.371(3) MeV (first neutron)
S_P = 1.5811(5) MeV (first proton)Half-life:298(1) msDecay constant λ:2.3259972502012 s^-1Specific activity α:4.518542929205 × 10⁺²² Bq g^-1
1221227818704.2 Ci g^-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μ_N) = 1.114(6)Nuclear g-factor:g_l = 1.114Mirror nucleus:Phosphorus-32Year of discovery:1953

Radioactive Decay

Half-life T_½ = 298(1) ms respectively 2.98 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy
EC/β⁺	³²S	99.92 %	12.6808(6) MeV
β⁺ p	³¹P	0.26(5) %	3.822 MeV
β⁺ α	²⁸Si	0.054(8) %	5,738 MeV

Parent Nuclides

Direct parent isotope is: ³²Ar.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 15) and isobaric (same nucleon number A = 32) with Chlorine-32. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 15	Isobar A = 32
5	²⁰B
6	²¹C
7	²²N
8	²³O
9	²⁴F
10	²⁵Ne	³²Ne
11	²⁶Na	³²Na
12	²⁷Mg	³²Mg
13	²⁸Al	³²Al
14	²⁹Si	³²Si
15	³⁰P	³²P
16	³¹S	³²S
17	³²Cl	³²Cl
18	³³Ar	³²Ar
19	³⁴K	³²K
20	³⁵Ca
21	³⁶Sc

External data and identifiers

Adopted Levels, Gammas:NuDat 32Cl

Literature and References

[1] - Neel W. Glass, Louis K. Jensen, J. Reginald Richardson:
The Short-Lived Radioisotopes P²⁸ and Cl³².
In: Physical Review, 90, 320, (1953), DOI 10.1103/PhysRev.90.320.2.

[2] - S. W. Breckon, A. Henrikson, J. S. Foster, W. M. Martin:
The Radioactive Isotopes Al²⁴, P²⁸, Cl³².
In: Canadian Journal of Physics, 32, 3, (1954), DOI 10.1139/p54-020.

[3] - W. F. Rogers et al.:
Ground-state magnetic moment of the T=1 nucleus ³²Cl using on-line β-NMR spectroscopy.
In: Physical Review C, 62, 044312, (2000), DOI 10.1103/PhysRevC.62.044312.