Aluminium-38

Properties and data of the isotope ³⁸Al.

Content

General data

Name of the isotope:Aluminium-38; Al-38Symbol:³⁸Al or 3813AlMass number A:38 (= number of nucleons)Atomic number Z:13 (= number of protons)Neutrons N:25Isotopic mass:38.0174(4) u (atomic weight of Aluminium-38)Nuclide mass:38.0102685 u (calculated nuclear mass without electrons)Mass excess:16.208 MeVMass defect:0.300948316 u (per nucleus)Nuclear binding energy:280.33155066 MeV (per nucleus)
7.37714607 MeV (average binding energy per nucleon)Separation energy:S_N = 1.67(42) MeV (first neutron)
S_P = 19.29(79) MeV (first proton)Half-life:9.0(7) msDecay constant λ:77.016353395549 s^-1Specific activity α:1.220535075438 × 10⁺²⁴ Bq g^-1
32987434471314 Ci g^-1Spin and parity:
(nuclear angular momentum)(0-)Year of discovery:1989

Radioactive Decay

Half-life T_½ = 9.0(7) ms respectively 9.0 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	³⁸Si	?	20.38(39) MeV
β^-, n	³⁷Si	?	14.71(39) MeV
β^-, 2n	³⁶Si	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 25) and isobaric (same nucleon number A = 38) with Aluminium-38. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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