| Autor: |
I. N. Ruskov, S. B. Borzakov, S. Yu. Zamyatnin, V. Yu. Konovalov, M. Florek, Sh.S. Zeinalov |
| Rok vydání: |
1998 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| Popis: |
The results of measurements of the fission cross-sections and resonance parameters {sigma}{sub 0}{gamma}{sub f} and {gamma}{sub f} of {sup 234}U and {sup 237}Np together with the preliminary results of {sup 243}Am fission cross-section measurements carried out in the framework of the program of studying subthreshold fission at the IBR-30 pulsed neutron source in Dubna are presented. The measurements were conducted by the time-of-flight technique. Fission events in {sup 234}U and {sup 237}Np were detected by two multisectional ionisation chambers containing {sup 234}U (about 100 mg) and {sup 237}Np (about 1.5 g) highly purified from isotopes with a large fission cross-section, such as {sup 235}U and {sup 239}Pu. Each chamber also contains a {sup 235}U target for neutron flux measurements. {sup 243}Am cross-section measurements are conducted with a back-to-back ionisation chamber containing about 2 mg of {sup 243}Am and 1 mg of {sup 235}U. The fission width is calculated in the region where the TOF resolution is sufficient to resolve most resonances at the energy up to 200 eV for {sup 234}U and below 50 eV for {sup 237}Np. The cross-sections in the energy region from 1 to 1000 eV are shown. The new upper limit for the thermal neutron inducedmore » fission of {sup 234}U is reported.« less |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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