Strontium-85
Properties and data of the isotope 85Sr.
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-1Spin 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 | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC | 85Rb | 100% | 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 Isomer | Excitation Energy | Half-life | Spin |
---|
85mSr | 238.79(5) keV | 67.63(4) min | 1/2- |
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.
Z | Isotone N = 47 | Isobar A = 85 |
26 | 73Fe | |
27 | 74Co | |
28 | 75Ni | |
29 | 76Cu | |
30 | 77Zn | 85Zn |
31 | 78Ga | 85Ga |
32 | 79Ge | 85Ge |
33 | 80As | 85As |
34 | 81Se | 85Se |
35 | 82Br | 85Br |
36 | 83Kr | 85Kr |
37 | 84Rb | 85Rb |
38 | 85Sr | 85Sr |
39 | 86Y | 85Y |
40 | 87Zr | 85Zr |
41 | 88Nb | 85Nb |
42 | 89Mo | 85Mo |
43 | 90Tc | 85Tc |
44 | 91Ru | 85Ru |
45 | 92Rh | |
46 | 93Pd | |
47 | 94Ag | |
48 | 95Cd | |
49 | 96In | |
External data and identifiers
Last update: 2020-10-14
Perma link: https://www.chemlin.org/isotope/strontium-85
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