Titanium-66

Properties and data of the isotope ⁶⁶Ti.

Contents

Titanium-66 is a radioisotope of the chemical element titanium, which has 44 neutrons in its atomic nucleus in addition to the element-specific 22 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 66. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ⁶⁶Ti is exclusively for academic purposes.

The discovery or first observation of the neutron-rich Ti nuclide was first reported in 2025; accordingly, titanium-66 was produced, separated, and identified by irradiating a carbon template with selenium-82 ions at an energy of 228 MeV/u [1].

The values given here are preliminary (estimated) values (mass, spin).

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

General data

Name of the isotope:Titanium-66; Ti-66Symbol:⁶⁶Ti or 6622TiMass number A:66 (= number of nucleons)Atomic number Z:22 (= number of protons)Neutrons N:44Isotopic mass:66.015 u (atomic weight of Titanium-66)Nuclide mass:66.0029315 u (calculated nuclear mass without electrons)Mass excess:13.97241 MeVMass defect:0.53840700800001 u (per nucleus)Nuclear binding energy:501.52289751 MeV (per nucleus)
7.59883178 MeV (average binding energy per nucleon)Half-life:Spin and parity:
(nuclear angular momentum)0+Year of discovery:2025

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 44) and isobaric (same nucleon number A = 66) with Titanium-66. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 44	Isobar A = 66
22	⁶⁶Ti	⁶⁶Ti
23	⁶⁷V	⁶⁶V
24	⁶⁸Cr	⁶⁶Cr
25	⁶⁹Mn	⁶⁶Mn
26	⁷⁰Fe	⁶⁶Fe
27	⁷¹Co	⁶⁶Co
28	⁷²Ni	⁶⁶Ni
29	⁷³Cu	⁶⁶Cu
30	⁷⁴Zn	⁶⁶Zn
31	⁷⁵Ga	⁶⁶Ga
32	⁷⁶Ge	⁶⁶Ge
33	⁷⁷As	⁶⁶As
34	⁷⁸Se	⁶⁶Se
35	⁷⁹Br	⁶⁶Br
36	⁸⁰Kr
37	⁸¹Rb
38	⁸²Sr
39	⁸³Y
40	⁸⁴Zr
41	⁸⁵Nb
42	⁸⁶Mo
43	⁸⁷Tc
44	⁸⁸Ru
45	⁸⁹Rh
46	⁹⁰Pd