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Measurements of subthreshold photofission angular distributions of238U and fission channel analysis

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Il Nuovo Cimento A (1965-1970)

Summary

Measurements of photofission fragment angular distributions of238U between 5.1 and 6.0 MeV are presented. As γ-source the intense bremsstrahlung beam from the Catania University Microtron is used. The results are analysed within the framework of the double-humped barrier model with a potential constructed with three smoothly joined parabolae and a damping term in the second well. The values of the fission barrier parameters for the involved 2+0, 1−0 and 1−11 channels are extracted and a comparison with the theoretical predictions and experimental results in the literature is made. Delayed-fission contributions for the involved channels are taken into account in the 1−1 channel parameter determination.

Riassunto

Sono presentate misure di distribuzioni angolari dei frammenti della fotofissione del238U tra 5.1 e 6.0 MeV. Come sorgente γ è stato usato l’intenso fascio di bremsstrahlung ottenuto dal microtrone dell’Università di Catania. I risultati sono analizzati nell’ambito di un modello a doppia barriera con un potenziale costruito con tre parabole tangenti ed un termine di smorzamento in seconda buca. Si estraggono i valori dei parametri di barriera per i canali coinvolti 2+ 0, 1−0, 1−1 e si fa un confronto con previsioni teoriche e risultati sperimentali esistenti in letteratura. Nella determinazione dei parametri per il canale 1−1 si tiene conto dei contributi da fissione ritardata per i canali coinvolti.

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Authors and Affiliations

  1. Istituto di Fisica dell’Università, Catania

    R. Alba, G. Bellia, L. Calabretta, A. Del Zoppo, E. Migneco & G. Russo

  2. Istituto Nazionale di Fisica Nucleare, Sezione di Catania, Catania, Italy

    R. Alba, G. Bellia, L. Calabretta, A. Del Zoppo, E. Migneco & G. Russo

  3. Centro Siciliano di Fisica Nucleare e di Struttura della Materia, Catania, Italy

    R. Alba, G. Bellia, L. Calabretta, A. Del Zoppo, E. Migneco & G. Russo

  4. Istituto di Fisica dell’Università, Messina, Italy

    R. C. Barnà & D. De Pasquale

  5. Istituto Nazionale di Fisica Nucleare, Gruppo di Messina, Messina, Italy

    R. C. Barnà & D. De Pasquale

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  1. R. Alba
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  2. G. Bellia
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  3. L. Calabretta
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  4. A. Del Zoppo
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  5. E. Migneco
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  6. G. Russo
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  7. R. C. Barnà
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  8. D. De Pasquale
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Alba, R., Bellia, G., Calabretta, L. et al. Measurements of subthreshold photofission angular distributions of238U and fission channel analysis. Nuov Cim A 62, 145–163 (1981). https://doi.org/10.1007/BF02904447

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  • DOI: https://doi.org/10.1007/BF02904447

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