Strontium-75

Properties and data of the isotope ⁷⁵Sr.

Contents

General data

Name of the isotope:Strontium-75; Sr-75Symbol:⁷⁵Sr or 7538SrMass number A:75 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:37Isotopic mass:74.94995(24) u (atomic weight of Strontium-75)Nuclide mass:74.9291048 u (calculated nuclear mass without electrons)Mass excess:-46.62127 MeVMass defect:0.66800310799999 u (per nucleus)Nuclear binding energy:622.24088708 MeV (per nucleus)
8.29654516 MeV (average binding energy per nucleon)Separation energy:S_N = 13.86(24) MeV (first neutron)
S_P = 1.99(22) MeV (first proton)Half-life:88(3) msDecay constant λ:7.876672506363 s^-1Specific activity α:6.41005828931 × 10⁺²² Bq g^-1
1732448186300.5 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Mirror nucleus:Rubidium-75Year of discovery:1991

Radioactive Decay

Half-life T_½ = 88(3) ms respectively 8.8 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁵Rb	94.8 %	10.60(22) MeV
EC, p	⁷⁴Kr	5.2(9) %

Parent Nuclides

Direct parent isotope is: ⁷⁶Y.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 37) and isobaric (same nucleon number A = 75) with Strontium-75. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 37	Isobar A = 75
19	⁵⁶K
20	⁵⁷Ca
21	⁵⁸Sc
22	⁵⁹Ti
23	⁶⁰V
24	⁶¹Cr
25	⁶²Mn
26	⁶³Fe
27	⁶⁴Co	⁷⁵Co
28	⁶⁵Ni	⁷⁵Ni
29	⁶⁶Cu	⁷⁵Cu
30	⁶⁷Zn	⁷⁵Zn
31	⁶⁸Ga	⁷⁵Ga
32	⁶⁹Ge	⁷⁵Ge
33	⁷⁰As	⁷⁵As
34	⁷¹Se	⁷⁵Se
35	⁷²Br	⁷⁵Br
36	⁷³Kr	⁷⁵Kr
37	⁷⁴Rb	⁷⁵Rb
38	⁷⁵Sr	⁷⁵Sr
39	⁷⁶Y
40	⁷⁷Zr