Scandium-46m2

Properties and data of the isotope ⁴⁶Sc.

Content

General data

Name of the isotope:Scandium-46m2; Sc-46m2Symbol: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-46m2)
Excitation energy: 142.528(7) keVNuclide 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)Half-life:18.75(4) sDecay constant λ:0.036967849629864 s^-1Specific activity α:4.947235505777 × 10⁺²⁰ Bq g^-1
13370906772.372 Ci g^-1Spin and parity:
(nuclear angular momentum)1-

Radioactive Decay

Half-life T_½ = 18.75(4) s respectively 1.875 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁴⁶Sc	100 %

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
⁴⁶Sc		83.79(4) d	4+
^46m1Sc	52.011(1) keV	9.4(8) μs	6+

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-46m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	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