Titanium-55

Properties and data of the isotope ⁵⁵Ti.

Content

General data

Name of the isotope:Titanium-55; Ti-55Symbol:⁵⁵Ti or 5522TiMass number A:55 (= number of nucleons)Atomic number Z:22 (= number of protons)Neutrons N:33Isotopic mass:54.95527(17) u (atomic weight of Titanium-55)Nuclide mass:54.9432015 u (calculated nuclear mass without electrons)Mass excess:-41.66573 MeVMass defect:0.502822932 u (per nucleus)Nuclear binding energy:468.37654422 MeV (per nucleus)
8.51593717 MeV (average binding energy per nucleon)Separation energy:S_N = 4.12(18) MeV (first neutron)
S_P = 15.07(32) MeV (first proton)Half-life:1.3(1) sDecay constant λ:0.53319013889227 s^-1Specific activity α:5.946196521367 × 10⁺²¹ Bq g^-1
160708014091.01 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2)-Year of discovery:1980

Radioactive Decay

Half-life T_½ = 1.3(1) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁵⁵V	100 %	7.48(16) MeV

Parent Nuclides

Direct parent isotope is: ⁵⁵Sc.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 33) and isobaric (same nucleon number A = 55) with Titanium-55. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 33	Isobar A = 55
16	⁴⁹S
17	⁵⁰Cl
18	⁵¹Ar
19	⁵²K	⁵⁵K
20	⁵³Ca	⁵⁵Ca
21	⁵⁴Sc	⁵⁵Sc
22	⁵⁵Ti	⁵⁵Ti
23	⁵⁶V	⁵⁵V
24	⁵⁷Cr	⁵⁵Cr
25	⁵⁸Mn	⁵⁵Mn
26	⁵⁹Fe	⁵⁵Fe
27	⁶⁰Co	⁵⁵Co
28	⁶¹Ni	⁵⁵Ni
29	⁶²Cu	⁵⁵Cu
30	⁶³Zn	⁵⁵Zn
31	⁶⁴Ga
32	⁶⁵Ge
33	⁶⁶As
34	⁶⁷Se
35	⁶⁸Br
36	⁶⁹Kr