Strontium-73

Properties and data of the isotope ⁷³Sr.

Contents

General data

Name of the isotope:Strontium-73; Sr-73Symbol:⁷³Sr or 7338SrMass number A:73 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:35Isotopic mass:72.96570(43) u (atomic weight of Strontium-73)Nuclide mass:72.9448548 u (calculated nuclear mass without electrons)Mass excess:-31.95024 MeVMass defect:0.63492327599999 u (per nucleus)Nuclear binding energy:591.42722205 MeV (per nucleus)
8.10174277 MeV (average binding energy per nucleon)Separation energy:
S_P = 0.909(641) MeV (first proton)Half-life:28 msDecay constant λ:24.755256448569 s^-1Specific activity α:2.070550574404 × 10⁺²³ Bq g^-1
5596082633526.5 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Mirror nucleus:Bromine-73Year of discovery:1993

Radioactive Decay

Half-life T_½ = 28 ms respectively 2.8 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	⁷³Rb	< 100 %	14.062(403) MeV
EC, p	⁷²Kr	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 35) and isobaric (same nucleon number A = 73) with Strontium-73. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 35	Isobar A = 73
18	⁵³Ar
19	⁵⁴K
20	⁵⁵Ca
21	⁵⁶Sc
22	⁵⁷Ti
23	⁵⁸V
24	⁵⁹Cr
25	⁶⁰Mn
26	⁶¹Fe	⁷³Fe
27	⁶²Co	⁷³Co
28	⁶³Ni	⁷³Ni
29	⁶⁴Cu	⁷³Cu
30	⁶⁵Zn	⁷³Zn
31	⁶⁶Ga	⁷³Ga
32	⁶⁷Ge	⁷³Ge
33	⁶⁸As	⁷³As
34	⁶⁹Se	⁷³Se
35	⁷⁰Br	⁷³Br
36	⁷¹Kr	⁷³Kr
37	⁷²Rb	⁷³Rb
38	⁷³Sr	⁷³Sr

External data and identifiers

Adopted Levels, Gammas:NuDat 73Sr

Literature and References

[1] - J. C. Batchelder, D. M. Moltz, T. J. Ognibene, M. W. Rowe, R. J. Tighe, Joseph Cerny:
Beta-delayed proton decay of ⁷³Sr.
In: Physical Review C, 48, 2593, (1993), DOI 10.1103/PhysRevC.48.2593.

[2] - D. E. M. Hoff, A. M. Rogers, S. M. Wang et al.:
Mirror-symmetry violation in bound nuclear ground states.
In: Nature, 580, 52–55, (2020), DOI 10.1038/s41586-020-2123-1.

[3] - L. Sinclair et al.:
Half-lives of ⁷³Sr and ⁷⁶Y and the consequences for the proton dripline.
In: Physical Review C, 100, 044311, (2019), DOI 10.1103/PhysRevC.100.044311.