About   |   More   |   Search

Actinium-219

Properties and data of the isotope 219Ac.

 

Actinium-219 is the very short-lived radioisotope of the element Actinium, whose atomic nucleus has 130 neutrons in addition to the element-specific 89 protons, resulting in a mass number of 219: 219 sup>Ac.

See also: list of Actinium isotopes.

 

General data

Name of the isotope:Actinium-219; Ac-219Symbol:219AcMass number A:219Atomic number Z:89 (= number of protons)Neutrons N:130Isotopic mass:219.01242(5) u (atomic weight of Actinium-219)Nuclide mass:218.9636026 u (calculated nuclear mass without electrons)Mass excess:11.56916 MeVMass defect:1.810446928 u (per nucleus)Nuclear binding energy:1686.42045075 MeV (per nucleus)
7.70055 MeV (average binding energy per nucleon)
Separation energy:SN = 7.35(7) MeV (first neutron)
SP = 2.37(5) MeV (first proton)
Half-life:11.8(15) μsDecay constant λ:58741.286488131 s-1Spin and parity:9/2-Year of discovery:1970

 

Radioactive Decay

Half-life T½ = 11.8(15) μs respectively 1.18 × 10-5 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α215Fr100 %8,83(5) MeV

 

Actinium-219 decay scheme

 

Parent Nuclides

Direct parent isotope is: 223Pa.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 130) and isobaric (same nucleon number A = 219) with Actinium-219. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 130Isobar A = 219
78208Pt
79209Au
80210Hg
81211Tl
82212Pb219Pb
83213Bi219Bi
84214Po219Po
85215At219At
86216Rn219Rn
87217Fr219Fr
88218Ra219Ra
89219Ac219Ac
90220Th219Th
91221Pa219Pa
92222U219U

 

External data and identifiers

Adopted Levels, Gammas:NuDat 219Ac

 


Category: Isotopes

Last update: 26.11.2022



© 1996 - 2022 Internetchemistry

 

 




I agree!

This site uses cookies. By using this website, you agree to the use of cookies! Learn more ...