Strontium-78
Properties and data of the isotope 78Sr.
See also: list of Strontium isotopes.
General data
Name of the isotope:Strontium-78; Sr-78Symbol:78Sr or 7838SrMass number A:78 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:40Isotopic mass:77.932180(8) u (atomic weight of Strontium-78)Nuclide mass:77.9113348 u (calculated nuclear mass without electrons)Mass excess:-63.17392 MeVMass defect:0.71176785599999 u (per nucleus)Nuclear binding energy:663.00748726 MeV (per nucleus)
8.50009599 MeV (average binding energy per nucleon)Separation energy:SN = 13.442(11) MeV (first neutron)
SP = 5.632(8) MeV (first proton)Half-life:160(8) sDecay constant λ:0.0043321698784997 s-1Specific activity α:3.388173667207 × 10+19 Bq g-1
915722612.75886 Ci g-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.2561(40) femtometer fmMirror nucleus:Zirconium-78Year of discovery:1982
Radioactive Decay
Half-life T½ = 160(8) s respectively 1.60 × 102 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 78Rb | 100 % | 3.761(8) MeV | |
Parent Nuclides
Direct parent isotope is: 78Y.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 40) and isobaric (same nucleon number A = 78) with Strontium-78. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 40 | Isobar A = 78 |
21 | 61Sc | |
22 | 62Ti | |
23 | 63V | |
24 | 64Cr | |
25 | 65Mn | |
26 | 66Fe | |
27 | 67Co | |
28 | 68Ni | 78Ni |
29 | 69Cu | 78Cu |
30 | 70Zn | 78Zn |
31 | 71Ga | 78Ga |
32 | 72Ge | 78Ge |
33 | 73As | 78As |
34 | 74Se | 78Se |
35 | 75Br | 78Br |
36 | 76Kr | 78Kr |
37 | 77Rb | 78Rb |
38 | 78Sr | 78Sr |
39 | 79Y | 78Y |
40 | 80Zr | 78Zr |
41 | 81Nb | |
42 | 82Mo | |
External data and identifiers
Last update: 2023-10-04
Perma link: https://www.chemlin.org/isotope/strontium-78
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