Calcium-43

Properties and data of the isotope ⁴³Ca.

Contents

General data

Name of the isotope:Calcium-43; Ca-43Symbol:⁴³Ca or 4320CaMass number A:43 (= number of nucleons)Atomic number Z:20 (= number of protons)Neutrons N:23Isotopic mass:42.958766(2) u (atomic weight of Calcium-43)Nuclide mass:42.9477946 u (calculated nuclear mass without electrons)Mass excess:-38.40922 MeVMass defect:0.397027708 u (per nucleus)Nuclear binding energy:369.82892784 MeV (per nucleus)
8.60067274 MeV (average binding energy per nucleon)Separation energy:S_N = 7.93289(17) MeV (first neutron)
S_P = 10.67577(25) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μ_N) = -1.31733(6)Charge radius:3.4954(19) femtometer fmMirror nucleus:Vanadium-43Year of discovery:1934

Parent Nuclides

Direct parent isotopes are: ⁴³K, ⁴³Sc.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Calcium Isotopic mixture	40.078 u	100 %
Isotope ⁴⁰Ca	39.9625909(2) u	96.941(156) %	stable	0+
Isotope ⁴¹Ca	40.96227792(15) u	[trace]	9.94(15) × 10⁴ a	7/2-
Isotope ⁴²Ca	41.958618(1) u	0.647(23) %	stable	0+
Isotope ⁴³Ca	42.958766(2) u	0.135(10) %	stable	7/2-
Isotope ⁴⁴Ca	43.955482(2) u	2.086(110) %	stable	0+
Isotope ⁴⁶Ca	45.95369(2) u	0.004(3) %	stable	0+
Isotope ⁴⁸Ca	47.952522654(19) u	0.187(21) %	5.3 × 10¹⁹ a	0+

NMR data

Nuclear magnetic properties of the NMR active Nuclide ⁴³Ca

Isotope:⁴³Ca-NMRQuantity:0.135(10) %Spin:7/2-Nuclearmagnetic moment
μ/μ_N:-1.31733(6)Gyromagnetic ratio γ:- 1.8025 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = -0.37638Quadrupole moment Q:- 0.0408(8) barn (100 fm²)Resonance frequency:v₀ = 2.8697 at 1 TRelative Sensitivity:0.00643 (H₀ = const.)
1.4154 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 23) and isobaric (same nucleon number A = 43) with Calcium-43. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 23	Isobar A = 43
10	³³Ne
11	³⁴Na
12	³⁵Mg
13	³⁶Al	⁴³Al
14	³⁷Si	⁴³Si
15	³⁸P	⁴³P
16	³⁹S	⁴³S
17	⁴⁰Cl	⁴³Cl
18	⁴¹Ar	⁴³Ar
19	⁴²K	⁴³K
20	⁴³Ca	⁴³Ca
21	⁴⁴Sc	⁴³Sc
22	⁴⁵Ti	⁴³Ti
23	⁴⁶V	⁴³V
24	⁴⁷Cr	⁴³Cr
25	⁴⁸Mn	⁴³Mn
26	⁴⁹Fe
27	⁵⁰Co
28	⁵¹Ni