Chlorine-37

Properties and data of the isotope ³⁷Cl.

Contents

General data

Name of the isotope:Chlorine-37; Cl-37Symbol:³⁷Cl or 3717ClMass number A:37 (= number of nucleons)Atomic number Z:17 (= number of protons)Neutrons N:20Isotopic mass:36.9659026(4) u (atomic weight of Chlorine-37)Nuclide mass:36.9565769 u (calculated nuclear mass without electrons)Mass excess:-31.76152 MeVMass defect:0.340421264 u (per nucleus)Nuclear binding energy:317.10036489 MeV (per nucleus)
8.57028013 MeV (average binding energy per nucleon)Separation energy:S_N = 10.31085(6) MeV (first neutron)
S_P = 8.38638(19) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = +0.68400(1)Charge radius:3.3840(170) femtometer fmMirror nucleus:Calcium-37Year of discovery:1919

Parent Nuclides

Direct parent isotopes are: ³⁷Ar, ³⁷S.

Occurrence

Comparison of the natural Chlorine isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Chlorine Isotopic mixture	35.45 u	100 %
Isotope ³⁶Cl	35.96830682(4) u	[trace]	3.013(15) × 10⁵ a	2+
Isotope ³⁷Cl	36.9659026(4) u	24.2 % [23.9 - 24.5 %]	stable	3/2+
Isotope ³⁵Cl	34.9688527(3) u	75.80(17) % [75.5 - 76.1 %]	stable	3/2+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ³⁷Cl

Isotope:³⁷Cl-NMRQuantity:24.2 % [23.9 - 24.5 %]Spin:3/2+Nuclearmagnetic moment
μ/μ_N:+0.68400(1)Gyromagnetic ratio γ:2.1842 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 0.456Quadrupole moment Q:- 0.06393 barn (100 fm²)Resonance frequency:v₀ = 3.4765 at 1 TRelative Sensitivity:0.00272 (H₀ = const.)
0.4083 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 20) and isobaric (same nucleon number A = 37) with Chlorine-37. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 20	Isobar A = 37
8	²⁸O
9	²⁹F
10	³⁰Ne
11	³¹Na	³⁷Na
12	³²Mg	³⁷Mg
13	³³Al	³⁷Al
14	³⁴Si	³⁷Si
15	³⁵P	³⁷P
16	³⁶S	³⁷S
17	³⁷Cl	³⁷Cl
18	³⁸Ar	³⁷Ar
19	³⁹K	³⁷K
20	⁴⁰Ca	³⁷Ca
21	⁴¹Sc	³⁷Sc
22	⁴²Ti
23	⁴³V
24	⁴⁴Cr
25	⁴⁵Mn
26	⁴⁶Fe
27	⁴⁷Co
28	⁴⁸Ni