Chlorine-41

Properties and data of the isotope ⁴¹Cl.

Contents

General data

Name of the isotope:Chlorine-41; Cl-41Symbol:⁴¹Cl or 4117ClMass number A:41 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:24Isotopic mass:40.97068(7) u (atomic weight of Chlorine-41)Nuclide mass:40.9613543 u (calculated nuclear mass without electrons)Mass excess:-27.3114 MeVMass defect:0.370303528 u (per nucleus)Nuclear binding energy:344.93551451 MeV (per nucleus)
8.41306133 MeV (average binding energy per nucleon)Separation energy:S_N = 7.821(76) MeV (first neutron)
S_P = 11.758(69) MeV (first proton)Half-life:38.4(8) sDecay constant λ:0.018050707827082 s^-1Specific activity α:2.717597628906 × 10⁺²⁰ Bq g^-1
7344858456.5032 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)Mirror nucleus:Chromium-41Year of discovery:1971

Radioactive Decay

Half-life T_½ = 38.4(8) s respectively 3.84 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴¹Ar	100 %	5.76031 MeV

Parent Nuclides

Direct parent isotopes are: ⁴¹S, ⁴²S.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 24) and isobaric (same nucleon number A = 41) with Chlorine-41. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 24	Isobar A = 41
10	³⁴Ne
11	³⁵Na
12	³⁶Mg
13	³⁷Al	⁴¹Al
14	³⁸Si	⁴¹Si
15	³⁹P	⁴¹P
16	⁴⁰S	⁴¹S
17	⁴¹Cl	⁴¹Cl
18	⁴²Ar	⁴¹Ar
19	⁴³K	⁴¹K
20	⁴⁴Ca	⁴¹Ca
21	⁴⁵Sc	⁴¹Sc
22	⁴⁶Ti	⁴¹Ti
23	⁴⁷V	⁴¹V
24	⁴⁸Cr	⁴¹Cr
25	⁴⁹Mn
26	⁵⁰Fe
27	⁵¹Co
28	⁵²Ni
29	⁵³Cu
30	⁵⁴Zn