Vanadium-55

Properties and data of the isotope ⁵⁵V.

Contents

General data

Name of the isotope:Vanadium-55; V-55Symbol:⁵⁵V or 5523VMass number A:55 (= number of nucleons)Atomic number Z:23 (= number of protons)Neutrons N:32Isotopic mass:54.94724(10) u (atomic weight of Vanadium-55)Nuclide mass:54.9346229 u (calculated nuclear mass without electrons)Mass excess:-49.14562 MeVMass defect:0.510013048 u (per nucleus)Nuclear binding energy:475.07409413 MeV (per nucleus)
8.6377108 MeV (average binding energy per nucleon)Separation energy:S_N = 7.32(10) MeV (first neutron)
S_P = 10.81(13) MeV (first proton)Half-life:6.54(15) sDecay constant λ:0.10598580742507 s^-1Specific activity α:1.18196566938 × 10⁺²¹ Bq g^-1
31945018091.486 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Year of discovery:1977

Radioactive Decay

Half-life T_½ = 6.54(15) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁵⁵Cr	100 %	5.97(10) MeV

Parent Nuclides

Direct parent isotope is: ⁵⁵Ti.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 32) and isobaric (same nucleon number A = 55) with Vanadium-55. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 32	Isobar A = 55
16	⁴⁸S
17	⁴⁹Cl
18	⁵⁰Ar
19	⁵¹K	⁵⁵K
20	⁵²Ca	⁵⁵Ca
21	⁵³Sc	⁵⁵Sc
22	⁵⁴Ti	⁵⁵Ti
23	⁵⁵V	⁵⁵V
24	⁵⁶Cr	⁵⁵Cr
25	⁵⁷Mn	⁵⁵Mn
26	⁵⁸Fe	⁵⁵Fe
27	⁵⁹Co	⁵⁵Co
28	⁶⁰Ni	⁵⁵Ni
29	⁶¹Cu	⁵⁵Cu
30	⁶²Zn	⁵⁵Zn
31	⁶³Ga
32	⁶⁴Ge
33	⁶⁵As
34	⁶⁶Se
35	⁶⁷Br
36	⁶⁸Kr