Titanium-40

Properties and data of the isotope ⁴⁰Ti.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Titanium-40; Ti-40Symbol:⁴⁰Ti or 4022TiMass number A:40 (= number of nucleons)Atomic number Z:22 (= number of protons)Neutrons N:18Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):0.81818181818182 (= neutron-proton ratio)Neutron excess (N-Z):-4Isotopic mass:39.99050(17) u (atomic weight of Titanium-40)Nuclide mass:39.9784315 u (calculated nuclear mass without electrons)Mass excess:-8.84919 MeVMass defect:0.33761919200001 u (per nucleus)Nuclear binding energy:314.49025163 MeV (per nucleus)
7.86225629 MeV (average binding energy per nucleon)Separation energy:S_N = 19.12(26) MeV (first neutron)
S_P = 1.97(16) MeV (first proton)Half-life:52.4(3) msDecay constant λ:13.227999629007 s^-1Specific activity α:2.042586591309 × 10⁺²³ Bq g^-1
5520504300836.5 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Mirror nucleus:Argon-40Year of discovery:1982

Radioactive Decay

Half-life T_½ = 52.4(3) ms respectively 5.24 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	⁴⁰Sc	56.99 %	11.67(16) MeV
EC, p	³⁹Ca	43.01 %

Parent Nuclides

Direct parent isotopes are: ⁴¹V, ⁴²Cr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 18) and isobaric (same nucleon number A = 40) with Titanium-40. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 18	Isobar A = 40
7	²⁵N
8	²⁶O
9	²⁷F
10	²⁸Ne
11	²⁹Na
12	³⁰Mg	⁴⁰Mg
13	³¹Al	⁴⁰Al
14	³²Si	⁴⁰Si
15	³³P	⁴⁰P
16	³⁴S	⁴⁰S
17	³⁵Cl	⁴⁰Cl
18	³⁶Ar	⁴⁰Ar
19	³⁷K	⁴⁰K
20	³⁸Ca	⁴⁰Ca
21	³⁹Sc	⁴⁰Sc
22	⁴⁰Ti	⁴⁰Ti
23	⁴¹V	⁴⁰V
24	⁴²Cr
25	⁴³Mn