Scandium-46

Properties and data of the isotope ⁴⁶Sc.

Contents

See also: List of individual Scandium isotopes (and general data sources).

General data

Name of the isotope:Scandium-46; Sc-46Symbol:⁴⁶Sc or 4621ScMass number A:46 (= number of nucleons)Atomic number Z:21 (= number of protons)Neutrons N:25Isotopic mass:45.9551719(9) u (atomic weight of Scandium-46)Nuclide mass:45.9436519 u (calculated nuclear mass without electrons)Mass excess:-41.75711 MeVMass defect:0.425776672 u (per nucleus)Nuclear binding energy:396.60841531 MeV (per nucleus)
8.62192207 MeV (average binding energy per nucleon)Separation energy:S_N = 8.76064(10) MeV (first neutron)
S_P = 8.2380(7) MeV (first proton)Half-life:83.79(4) dDecay constant λ:9.574575500699 × 10^-8 s^-1Specific activity α:1.281320940873 × 10⁺¹⁵ Bq g^-1
34630.295699286 Ci g^-1Spin and parity:
(nuclear angular momentum)4+Magnetic dipole moment:μ(μ_N) = +3.040(8)Quadrupole moment Q:0.119(6) barn (100 fm²)Nuclear g-factor:g_l = 0.76Charge radius:3.5243(89) femtometer fmMirror nucleus:Manganese-46Year of discovery:1936

Radioactive Decay

Half-life T_½ = 83.79(4) d respectively 7.239456 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁶Ti	100 %	2.3666(7) MeV

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^46m1Sc	52.011(1) keV	9.4(8) μs	6+
^46m2Sc	142.528(7) keV	18.75(4) s	1-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 25) and isobaric (same nucleon number A = 46) with Scandium-46. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 25	Isobar A = 46
11	³⁶Na
12	³⁷Mg
13	³⁸Al
14	³⁹Si
15	⁴⁰P	⁴⁶P
16	⁴¹S	⁴⁶S
17	⁴²Cl	⁴⁶Cl
18	⁴³Ar	⁴⁶Ar
19	⁴⁴K	⁴⁶K
20	⁴⁵Ca	⁴⁶Ca
21	⁴⁶Sc	⁴⁶Sc
22	⁴⁷Ti	⁴⁶Ti
23	⁴⁸V	⁴⁶V
24	⁴⁹Cr	⁴⁶Cr
25	⁵⁰Mn	⁴⁶Mn
26	⁵¹Fe	⁴⁶Fe
27	⁵²Co	⁴⁶Co
28	⁵³Ni
29	⁵⁴Cu
30	⁵⁵Zn