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Yttrium-87

Properties and data of the isotope 87Y.


Content

See also: list of Yttrium isotopes.

 

General data

Name of the isotope:Yttrium-87; Y-87Symbol:87Y or 8739YMass number A:87 (= number of nucleons)Atomic number Z:39 (= number of protons)Neutrons N:48Isotopic mass:86.9108761(12) u (atomic weight of Yttrium-87)Nuclide mass:86.8894824 u (calculated nuclear mass without electrons)Mass excess:-83.01838 MeVMass defect:0.81021611600001 u (per nucleus)Nuclear binding energy:754.71145076 MeV (per nucleus)
8.67484426 MeV (average binding energy per nucleon)
Separation energy:SN = 11.807(14) MeV (first neutron)
SP = 5.7843(11) MeV (first proton)
Half-life:79.8(3) hDecay constant λ:2.412793026176 × 10-6 s-1Specific activity α:1.689555752268 × 10+16 Bq g-1
456636.68980224 Ci g-1
Spin and parity:
(nuclear angular momentum)
1/2-Magnetic dipole moment:μ(μN) = - 0.19(2)Nuclear g-factor:gl = -0.38Charge radius:4.2498(22) femtometer fmYear of discovery:1940

 

Radioactive Decay

Half-life T½ = 79.8(3) h (hours) respectively 2.87280 × 105 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+87Sr100 %1.8617(11) MeV

 

Parent Nuclides

Direct parent isotope is: 87Zr.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
87mY380.82(7) keV13.37(3) h9/2+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 87) with Yttrium-87. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 48Isobar A = 87
2674Fe
2775Co
2876Ni
2977Cu
3078Zn
3179Ga87Ga
3280Ge87Ge
3381As87As
3482Se87Se
3583Br87Br
3684Kr87Kr
3785Rb87Rb
3886Sr87Sr
3987Y87Y
4088Zr87Zr
4189Nb87Nb
4290Mo87Mo
4391Tc87Tc
4492Ru87Ru
4593Rh
4694Pd
4795Ag
4896Cd
4997In

 

External data and identifiers

Adopted Levels, Gammas:NuDat 87Y

 


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Last update: 2020-10-14


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