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Arsenic-70

Properties and data of the isotope 70As.


Contents

See also: list of Arsenic isotopes.

 

General data

Name of the isotope:Arsenic-70; As-70Symbol:70As or 7033AsMass number A:70 (= number of nucleons)Atomic number Z:33 (= number of protons)Neutrons N:37Isotopic mass:69.93093(5) u (atomic weight of Arsenic-70)Nuclide mass:69.9128275 u (calculated nuclear mass without electrons)Mass excess:-64.33829 MeVMass defect:0.64789794799999 u (per nucleus)Nuclear binding energy:603.51305117 MeV (per nucleus)
8.62161502 MeV (average binding energy per nucleon)
Separation energy:SN = 9.30(60) MeV (first neutron)
SP = 4.53(50) MeV (first proton)
Half-life:52.6(3) minDecay constant λ:0.00021962838420784 s-1Specific activity α:1.916859516724 × 10+18 Bq g-1
51807013.965527 Ci g-1
Spin and parity:
(nuclear angular momentum)
4+Magnetic dipole moment:μ(μN) = +2.1104(5)Quadrupole moment Q:0.09(2) barn (100 fm2)Nuclear g-factor:gl = 0.5276Year of discovery:1950

 

Radioactive Decay

Half-life T½ = 52.6(3) min (minutes) respectively 3.156 × 103 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC/β+70Ge100 %6.22(5) MeV

 

Parent Nuclides

Direct parent isotope is: 70Se.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
70mAs32.046(23) keV96(3) μs2+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 37) and isobaric (same nucleon number A = 70) with Arsenic-70. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 37Isobar A = 70
1956K
2057Ca
2158Sc
2259Ti
2360V
2461Cr
2562Mn70Mn
2663Fe70Fe
2764Co70Co
2865Ni70Ni
2966Cu70Cu
3067Zn70Zn
3168Ga70Ga
3269Ge70Ge
3370As70As
3471Se70Se
3572Br70Br
3673Kr70Kr
3774Rb
3875Sr
3976Y
4077Zr

 

External data and identifiers

Adopted Levels, Gammas:NuDat 70As

 


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Last update: 2020-10-14


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