Chlorine-47

Properties and data of the isotope ⁴⁷Cl.

Contents

General data

Name of the isotope:Chlorine-47; Cl-47Symbol:⁴⁷Cl or 4717ClMass number A:47 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:30Isotopic mass:46.98950(43) u (atomic weight of Chlorine-47)Nuclide mass:46.9801743 u (calculated nuclear mass without electrons)Mass excess:-9.78069 MeVMass defect:0.403473024 u (per nucleus)Nuclear binding energy:375.83270102 MeV (per nucleus)
7.99644045 MeV (average binding energy per nucleon)Separation energy:S_N = 3.99(45) MeV (first neutron)
S_P = 17.41(64) MeV (first proton)Half-life:101(6) msDecay constant λ:6.8628433718806 s^-1Specific activity α:8.984567279380 × 10⁺²² Bq g^-1
2428261426859.5 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Year of discovery:1989

Radioactive Decay

Half-life T_½ = 101(6) ms respectively 1.01 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁷Ar	97 %	15.59(40) MeV
β^-, n	⁴⁶Ar	< 3 %	11.92(40) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 30) and isobaric (same nucleon number A = 47) with Chlorine-47. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 30	Isobar A = 47
13	⁴³Al
14	⁴⁴Si
15	⁴⁵P
16	⁴⁶S	⁴⁷S
17	⁴⁷Cl	⁴⁷Cl
18	⁴⁸Ar	⁴⁷Ar
19	⁴⁹K	⁴⁷K
20	⁵⁰Ca	⁴⁷Ca
21	⁵¹Sc	⁴⁷Sc
22	⁵²Ti	⁴⁷Ti
23	⁵³V	⁴⁷V
24	⁵⁴Cr	⁴⁷Cr
25	⁵⁵Mn	⁴⁷Mn
26	⁵⁶Fe	⁴⁷Fe
27	⁵⁷Co	⁴⁷Co
28	⁵⁸Ni
29	⁵⁹Cu
30	⁶⁰Zn
31	⁶¹Ga
32	⁶²Ge
33	⁶³As
34	⁶⁴Se