Summary
The possible presence of molecular structures in the21Ne composite system has been investigated by means of9Be+12C elastic scattering in the energy rangeE c.m.=(6.23÷12.06) MeV at θc.m.=127.7°. The SDM analysis of the excitation function has pointed out the existence of intermediate-width statistical fluctuations of molecular nature together with compound-nucleus fluctuations. The intermediate coherence energies of about 300 keV correspond to a mean lifetime τ≈2.2·10−21 s for the overlapping molecular states.
Riassunto
L'eventuale presenza di strutture di tipo molecolare nel sistema composto21Ne è stata studiata mediante la diffusione elastica di9Be su12C ad energie comprese tra 6.23 e 12.06 MeV nel centro di massa ad un angolo θc.m.=127.7°. La funzione di eccitazione è stata analizzata utilizzando il metodo della densità spettrale che ha permesso di rilevare l'esistenza di fluttuazioni statistiche di natura molecolare insieme con fluttuazioni di nucleo composto. Per gli stati molecolari sovrapposti si hanno energie di coerenza intermedie di circa 300 keV, corrispondenti ad una vita media τ≈2.2·10−21 s.
Резюме
С помощью упругого рассеяния9Be+12C в области энергийE c.m.=(6.23÷12.06) МэВ при θc.m.=127.7° исследуется возможное присутствие молекулярных структур в составной системе21Ne. Используя метод спектральной плотности, анализируется функция возбуждения. Результаты анализа указывают на сушествование статистических флуктуаций молекулярной природы вместе с флуктуациями компаунд-ядер. Промежуточные энергии порядка 300 кэВ соответствуют среднему времени жизни τ≈2.2·10−21 с для перекрываюшихся молекулярных состояний.
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De Rosa, A., Inglima, G., Sandoli, M. et al. Molecular behaviour of the9Be+12C system from elastic-cross-section fluctuation analysis. Nuov Cim A 85, 269–279 (1985). https://doi.org/10.1007/BF02902453
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DOI: https://doi.org/10.1007/BF02902453