Chlorine-49

Properties and data of the isotope ⁴⁹Cl.

Contents

General data

Name of the isotope:Chlorine-49; Cl-49Symbol:⁴⁹Cl or 4917ClMass number A:49 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:32Isotopic mass:49.00101(64) u (atomic weight of Chlorine-49)Nuclide mass:48.9916843 u (calculated nuclear mass without electrons)Mass excess:0.94081 MeVMass defect:0.409292856 u (per nucleus)Nuclear binding energy:381.25383961 MeV (per nucleus)
7.7806906 MeV (average binding energy per nucleon)Separation energy:S_N = 2.85(78) MeV (first neutron)
S_P = 19.11(85) MeV (first proton)Half-life:170 nsDecay constant λ:4077336.356235 s^-1Specific activity α:5.011080381752 × 10⁺²⁸ Bq g^-1
1.354346049122 × 10⁺¹⁸ Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Year of discovery:1989

Radioactive Decay

Half-life T_½ = 170 ns respectively 1.70 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁹Ar	?	18.13(72) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 32) and isobaric (same nucleon number A = 49) with Chlorine-49. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 32	Isobar A = 49
16	⁴⁸S	⁴⁹S
17	⁴⁹Cl	⁴⁹Cl
18	⁵⁰Ar	⁴⁹Ar
19	⁵¹K	⁴⁹K
20	⁵²Ca	⁴⁹Ca
21	⁵³Sc	⁴⁹Sc
22	⁵⁴Ti	⁴⁹Ti
23	⁵⁵V	⁴⁹V
24	⁵⁶Cr	⁴⁹Cr
25	⁵⁷Mn	⁴⁹Mn
26	⁵⁸Fe	⁴⁹Fe
27	⁵⁹Co	⁴⁹Co
28	⁶⁰Ni	⁴⁹Ni
29	⁶¹Cu
30	⁶²Zn
31	⁶³Ga
32	⁶⁴Ge
33	⁶⁵As
34	⁶⁶Se
35	⁶⁷Br
36	⁶⁸Kr