Titanium-42

Properties and data of the isotope ⁴²Ti.

Content

General data

Name of the isotope:Titanium-42; Ti-42Symbol:⁴²Ti or 4222TiMass number A:42 (= number of nucleons)Atomic number Z:22 (= number of protons)Neutrons N:20Isotopic mass:41.9730490(3) u (atomic weight of Titanium-42)Nuclide mass:41.9609805 u (calculated nuclear mass without electrons)Mass excess:-25.10469 MeVMass defect:0.372400024 u (per nucleus)Nuclear binding energy:346.88838796 MeV (per nucleus)
8.25924733 MeV (average binding energy per nucleon)Separation energy:S_N = 17.478(28) MeV (first neutron)
S_P = 3.75123(27) MeV (first proton)Half-life:208.65(80) msDecay constant λ:3.3220569401387 s^-1Specific activity α:4.879486545913 × 10⁺²² Bq g^-1
1318780147544.2 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Mirror nucleus:Calcium-42Year of discovery:1964

Radioactive Decay

Half-life T_½ = 208.65(80) ms respectively 2.0865 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	⁴²Sc	100 %	7.0165(3) MeV

Parent Nuclides

Direct parent isotope is: ⁴³Cr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 20) and isobaric (same nucleon number A = 42) with Titanium-42. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 20	Isobar A = 42
8	²⁸O
9	²⁹F
10	³⁰Ne
11	³¹Na
12	³²Mg
13	³³Al	⁴²Al
14	³⁴Si	⁴²Si
15	³⁵P	⁴²P
16	³⁶S	⁴²S
17	³⁷Cl	⁴²Cl
18	³⁸Ar	⁴²Ar
19	³⁹K	⁴²K
20	⁴⁰Ca	⁴²Ca
21	⁴¹Sc	⁴²Sc
22	⁴²Ti	⁴²Ti
23	⁴³V	⁴²V
24	⁴⁴Cr	⁴²Cr
25	⁴⁵Mn	⁴²Mn
26	⁴⁶Fe
27	⁴⁷Co
28	⁴⁸Ni