Strontium-74

Properties and data of the isotope ⁷⁴Sr.

Contents

See also: List of individual Strontium isotopes (and general data sources).

General data

Name of the isotope:Strontium-74; Sr-74Symbol:⁷⁴Sr or 7438SrMass number A:74 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:36Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):0.94736842105263 (= neutron-proton ratio)Neutron excess (N-Z):-2Isotopic mass:73.95617(11) u (atomic weight of Strontium-74)Nuclide mass:73.9353248 u (calculated nuclear mass without electrons)Mass excess:-40.82738 MeVMass defect:0.65311819200001 u (per nucleus)Nuclear binding energy:608.37567714 MeV (per nucleus)
8.22129293 MeV (average binding energy per nucleon)Separation energy:S_N = 16.95(41) MeV (first neutron)
S_P = 2.030(22) MeV (first proton)Half-life:27(8) msDecay constant λ:25.672117798516 s^-1Specific activity α:2.117823418569 × 10⁺²³ Bq g^-1
5723847077214.3 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Mirror nucleus:Krypton-74Year of discovery:1995

Radioactive Decay

Half-life T_½ = 27(8) ms respectively 2.7 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁴Rb		11.09(10) MeV
EC, p	⁷³Kr	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 36) and isobaric (same nucleon number A = 74) with Strontium-74. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 36	Isobar A = 74
18	⁵⁴Ar
19	⁵⁵K
20	⁵⁶Ca
21	⁵⁷Sc
22	⁵⁸Ti
23	⁵⁹V
24	⁶⁰Cr
25	⁶¹Mn
26	⁶²Fe	⁷⁴Fe
27	⁶³Co	⁷⁴Co
28	⁶⁴Ni	⁷⁴Ni
29	⁶⁵Cu	⁷⁴Cu
30	⁶⁶Zn	⁷⁴Zn
31	⁶⁷Ga	⁷⁴Ga
32	⁶⁸Ge	⁷⁴Ge
33	⁶⁹As	⁷⁴As
34	⁷⁰Se	⁷⁴Se
35	⁷¹Br	⁷⁴Br
36	⁷²Kr	⁷⁴Kr
37	⁷³Rb	⁷⁴Rb
38	⁷⁴Sr	⁷⁴Sr