Strontium-79

Properties and data of the isotope ⁷⁹Sr.

Contents

General data

Name of the isotope:Strontium-79; Sr-79Symbol:⁷⁹Sr or 7938SrMass number A:79 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:41Isotopic mass:78.929708(9) u (atomic weight of Strontium-79)Nuclide mass:78.9088628 u (calculated nuclear mass without electrons)Mass excess:-65.47658 MeVMass defect:0.72290477199999 u (per nucleus)Nuclear binding energy:673.38145769 MeV (per nucleus)
8.52381592 MeV (average binding energy per nucleon)Separation energy:S_N = 10.374(11) MeV (first neutron)
S_P = 5.830(9) MeV (first proton)Half-life:2.25(10) minDecay constant λ:0.0051344235597033 s^-1Specific activity α:3.96413101424 × 10⁺¹⁹ Bq g^-1
1071386760.6068 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2(-)Magnetic dipole moment:μ(μ_N) = -0.474(4)Quadrupole moment Q:+0.661(6) barn (100 fm²)Nuclear g-factor:g_l = -0.316Charge radius:4.2586(39) femtometer fmYear of discovery:1972

Radioactive Decay

Half-life T_½ = 2.25(10) min (minutes) respectively 1.35 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁹Rb	100 %	5.326(9) MeV

Parent Nuclides

Direct parent isotope is: ⁷⁹Y.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 41) and isobaric (same nucleon number A = 79) with Strontium-79. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 41	Isobar A = 79
22	⁶³Ti
23	⁶⁴V
24	⁶⁵Cr
25	⁶⁶Mn
26	⁶⁷Fe
27	⁶⁸Co
28	⁶⁹Ni	⁷⁹Ni
29	⁷⁰Cu	⁷⁹Cu
30	⁷¹Zn	⁷⁹Zn
31	⁷²Ga	⁷⁹Ga
32	⁷³Ge	⁷⁹Ge
33	⁷⁴As	⁷⁹As
34	⁷⁵Se	⁷⁹Se
35	⁷⁶Br	⁷⁹Br
36	⁷⁷Kr	⁷⁹Kr
37	⁷⁸Rb	⁷⁹Rb
38	⁷⁹Sr	⁷⁹Sr
39	⁸⁰Y	⁷⁹Y
40	⁸¹Zr	⁷⁹Zr
41	⁸²Nb
42	⁸³Mo
44	⁸⁵Ru