Arsenic-73m

Properties and data of the isotope ⁷³As.

Content

General data

Name of the isotope:Arsenic-73m; As-73mSymbol:⁷³As or 7333AsMass number A:73 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:40Isotopic mass:72.923829(4) u (atomic weight of Arsenic-73m)
Excitation energy: 427.902(21) keVNuclide mass:72.9057265 u (calculated nuclear mass without electrons)Mass excess:-70.95283 MeVMass defect:0.680993696 u (per nucleus)Nuclear binding energy:634.34154186 MeV (per nucleus)
8.68961016 MeV (average binding energy per nucleon)Half-life:5.7(2) μsDecay constant λ:121604.76851929 s^-1Specific activity α:1.017112562865 × 10⁺²⁷ Bq g^-1
2.748952872609 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μ_N) = + 5.234(14)Nuclear g-factor:g_l = 1.1631111111111

Radioactive Decay

Half-life T_½ = 5.7(2) μs respectively 5.7 × 10^-6 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	⁷³As

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
⁷³As		80.30(6) d	3/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 40) and isobaric (same nucleon number A = 73) with Arsenic-73m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 40	Isobar A = 73
21	⁶¹Sc
22	⁶²Ti
23	⁶³V
24	⁶⁴Cr
25	⁶⁵Mn
26	⁶⁶Fe	⁷³Fe
27	⁶⁷Co	⁷³Co
28	⁶⁸Ni	⁷³Ni
29	⁶⁹Cu	⁷³Cu
30	⁷⁰Zn	⁷³Zn
31	⁷¹Ga	⁷³Ga
32	⁷²Ge	⁷³Ge
33	⁷³As	⁷³As
34	⁷⁴Se	⁷³Se
35	⁷⁵Br	⁷³Br
36	⁷⁶Kr	⁷³Kr
37	⁷⁷Rb	⁷³Rb
38	⁷⁸Sr	⁷³Sr
39	⁷⁹Y
40	⁸⁰Zr
41	⁸¹Nb
42	⁸²Mo