Titanium-65

Properties and data of the isotope ⁶⁵Ti.

Contents

Titanium-65 is a radioisotope of the chemical element titanium, which has 43 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 65. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical significance; the study of ⁶⁵Ti is exclusively for academic purposes.

The discovery or first observation of the neutron-rich Ti nuclide was first reported in 2025; accordingly, titanium-65 was produced, separated, and identified by irradiating a carbon template with selenium-82 ions at an energy of 228 MeV/u [1].

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

General data

Name of the isotope:Titanium-65; Ti-65Symbol:⁶⁵Ti or 6522TiMass number A:65 (= number of nucleons)Atomic number Z:22 (= number of protons)Neutrons N:43Isotopic mass:65.005590(750) u (atomic weight of Titanium-65)Nuclide mass:64.9935215 u (calculated nuclear mass without electrons)Mass excess:5.20705 MeVMass defect:0.53915209200001 u (per nucleus)Nuclear binding energy:502.21693879 MeV (per nucleus)
7.72641444 MeV (average binding energy per nucleon)Separation energy:S_N = 1.381(922) MeV (first neutron)Half-life:1 msDecay constant λ:693.14718055995 s^-1Specific activity α:6.421892243076 × 10⁺²⁴ Bq g^-1
1.735646552182 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2-)Year of discovery:2025

Radioactive Decay

Half-life T_½ = 1 ms respectively 1 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-, xn		?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 65) with Titanium-65. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 43	Isobar A = 65
22	⁶⁵Ti	⁶⁵Ti
23	⁶⁶V	⁶⁵V
24	⁶⁷Cr	⁶⁵Cr
25	⁶⁸Mn	⁶⁵Mn
26	⁶⁹Fe	⁶⁵Fe
27	⁷⁰Co	⁶⁵Co
28	⁷¹Ni	⁶⁵Ni
29	⁷²Cu	⁶⁵Cu
30	⁷³Zn	⁶⁵Zn
31	⁷⁴Ga	⁶⁵Ga
32	⁷⁵Ge	⁶⁵Ge
33	⁷⁶As	⁶⁵As
34	⁷⁷Se	⁶⁵Se
35	⁷⁸Br
36	⁷⁹Kr
37	⁸⁰Rb
38	⁸¹Sr
39	⁸²Y
40	⁸³Zr
41	⁸⁴Nb
42	⁸⁵Mo
43	⁸⁶Tc
44	⁸⁷Ru