Search for the “missing” α-decay branch in 239Cm
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Summary
A search for the α-decay of 239Cm was carried out via the fusion reaction 232Th(12C,5n) 239Cm at GSI, applying nuclear chemistry techniques. The 239Cm α-decay would provide a link between known nuclear masses and α-decay energies measured in the region of the superheavy elements. Three different 12C beam energies were chosen in the present experiments. The α peaks of 238,240Cm were observed clearly at a 12C energy of 74 MeV, while 238Cm disappeared at 70 MeV to provide an undisturbed α-spectrum for a sensitive search of 239Cm decay. No α-events between 6.34 and 6.50 MeV, which could be assigned to 239Cm with confidence, were observed in this experiment. The upper limit of the α-branch of 239Cm was less than 1.0×10−5.
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Artikel in diesem Heft
- Precise isotope ratio measurements by MC-ICP-MS and application of the isotope dilution technique for the determination of germanium in the Gallium Neutrino Observatory
- Search for the “missing” α-decay branch in 239Cm
- Cross sections of proton induced nuclear reactions on natural cadmium leading to the formation of radionuclides of indium
- Comparative studies on the dissolution of ceramic UO2 pellets in nitric acid by microwave and conventional heating
- Selenide retention onto pyrite under reducing conditions
- Kinetics and thermodynamics of adsorption of trace amount of uranium on activated carbon
- Characterization of Lin'an montmorillonite and its application in the removal of Ni2+ from aqueous solutions
- Effect of ozone on ruthenium species in alkaline medium – Part III: Oxidative dissolution of ruthenium deposits onto stainless steel
- Computer-aided design of new metal binders
Artikel in diesem Heft
- Precise isotope ratio measurements by MC-ICP-MS and application of the isotope dilution technique for the determination of germanium in the Gallium Neutrino Observatory
- Search for the “missing” α-decay branch in 239Cm
- Cross sections of proton induced nuclear reactions on natural cadmium leading to the formation of radionuclides of indium
- Comparative studies on the dissolution of ceramic UO2 pellets in nitric acid by microwave and conventional heating
- Selenide retention onto pyrite under reducing conditions
- Kinetics and thermodynamics of adsorption of trace amount of uranium on activated carbon
- Characterization of Lin'an montmorillonite and its application in the removal of Ni2+ from aqueous solutions
- Effect of ozone on ruthenium species in alkaline medium – Part III: Oxidative dissolution of ruthenium deposits onto stainless steel
- Computer-aided design of new metal binders
