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Strontium-85

Properties and data of the isotope 85Sr.


Contents

See also: list of Strontium isotopes.

 

General data

Name of the isotope:Strontium-85; Sr-85Symbol:85Sr or 8538SrMass number A:85 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:47Isotopic mass:84.912932(3) u (atomic weight of Strontium-85)Nuclide mass:84.8920868 u (calculated nuclear mass without electrons)Mass excess:-81.10332 MeVMass defect:0.791670268 u (per nucleus)Nuclear binding energy:737.43610462 MeV (per nucleus)
8.67571888 MeV (average binding energy per nucleon)
Separation energy:SN = 8.525(3) MeV (first neutron)
SP = 8.633(4) MeV (first proton)
Half-life:64.849(7) dDecay constant λ:1.237110335091 × 10-7 s-1Specific activity α:8.869110353816 × 10+14 Bq g-1
23970.568523829 Ci g-1
Spin and parity:
(nuclear angular momentum)
9/2+Magnetic dipole moment:μ(μN) = -1.0001(7)Quadrupole moment Q:+0.282(15) barn (100 fm2)Nuclear g-factor:gl = -0.22224444444444Charge radius:4.2304(21) femtometer fmYear of discovery:1940

 

Radioactive Decay

Half-life T½ = 64.849(7) d respectively 5.6029536 × 106 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
EC85Rb100%1.0640(28) MeV

 

Parent Nuclides

Direct parent isotope is: 85Y.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
85mSr238.79(5) keV67.63(4) min1/2-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 47) and isobaric (same nucleon number A = 85) with Strontium-85. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 47Isobar A = 85
2673Fe
2774Co
2875Ni
2976Cu
3077Zn85Zn
3178Ga85Ga
3279Ge85Ge
3380As85As
3481Se85Se
3582Br85Br
3683Kr85Kr
3784Rb85Rb
3885Sr85Sr
3986Y85Y
4087Zr85Zr
4188Nb85Nb
4289Mo85Mo
4390Tc85Tc
4491Ru85Ru
4592Rh
4693Pd
4794Ag
4895Cd
4996In

 

External data and identifiers

Adopted Levels, Gammas:NuDat 85Sr

 


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Last update: 2020-10-14


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