Scandium-44m3

Properties and data of the isotope ⁴⁴Sc.

Content

General data

Name of the isotope:Scandium-44m3; Sc-44m3Symbol:⁴⁴Sc or 4421ScMass number A:44 (= number of nucleons)Atomic number Z:21 (= number of protons)Neutrons N:23Isotopic mass:43.9594029(19) u (atomic weight of Scandium-44m3)
Excitation energy: 271.24(1) keVNuclide mass:43.9478829 u (calculated nuclear mass without electrons)Mass excess:-37.81596 MeVMass defect:0.40421584000001 u (per nucleus)Nuclear binding energy:376.52462966 MeV (per nucleus)
8.55737795 MeV (average binding energy per nucleon)Half-life:58.61(10) hDecay constant λ:3.285120004928 × 10^-6 s^-1Specific activity α:4.600803584064 × 10⁺¹⁶ Bq g^-1
1243460.4281255 Ci g^-1Spin and parity:
(nuclear angular momentum)6+Magnetic dipole moment:μ(μ_N) = + 3.831(12)Quadrupole moment Q:- 0.21(9) barn (100 fm²)Nuclear g-factor:g_l = 0.6385

Radioactive Decay

Half-life T_½ = 58.61(10) h (hours) respectively 2.10996 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁴⁴Sc	98.80(7) %	0.271 MeV
EE β⁺	⁴⁴Ca	1.20(7) %	3.924 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
⁴⁴Sc		3.97(4) h	2+
^44m1Sc	67.8679(14) keV	154.8(8) ns	1-
^44m2Sc	146.1914(20) keV	51.0(3) μs	0-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 23) and isobaric (same nucleon number A = 44) with Scandium-44m3. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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