Summary
The25Mg(3He,α)24Mg reaction has been studied at\(E_{3_{He} } \)=(9÷13) MeV for the α-groups leading to the ground state and to the first five excited levels of the residual nucleus. The excitation functions have been measured in steps of 100 keV. Differential cross-sections have been obtained in the angular range (15÷150)° in steps of 5°. The statistical contribution, estimated by a standard statistical analysis and by Hauser-Feshbach calculations, is quite relevant. The angular distributions averaged after subtraction of the statistical contribution have been compared with the DWBA calculations and with a diffraction model. Relative spectroscopic ratios have been derived with both models.
Riassunto
La reazione25Mg(3He,α)24Mg è stata studiata per i gruppi α che lasciano il nucleo residuo nello stato fondamentale ed nei primi cinque livelli eccitati, nell’intervallo di energia (9÷13) MeV. Sono state misurate le funzioni di eccitazione a passi di 100 keV e le distribuzioni angolari nell’intervallo (15÷150)° a passi di 5°. Il contributo di nucleo composto, dedotto da un’analisi statistica e da calcoli di Hauser-Feshbach, risulta essere abbastanza rilevante. Le distribuzioni angolari mediate e da cui è stato sottratto il contributo statistico sono state confrontate con calcoli DWBA et con un modello di tipo diffrazionale. I rapporti spettroscopici relativi sono stati dedotti con entrambi i modelli.
Реэюме
Исследуется реакция25Mg(3He,α)24Mg при\(E_{3_{He} } \)=(9÷13) МзВ для групп альфа-частиц, приводяших к основному состоянию и к первым пяти воэбужденным уровням остаточного ядра. Функции воэбуждения иэмерены с щагом 100 KзB. Дифференциальное поперечное сечение получено в угловой области от 15° до 150° с щагом 5°. Статистический вклад оценивается с помошью стандартного статистического аналиэа и с помошью вычислений Хауэера-Фещбаха. Угловые распределения, усредненные после вычитания статистического вклада, сравниваются с вычислениями DWBA и с дифракционной моделью. С помошью обеих моделей определяются относительные спектроскопические отнощения.
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This work has been financially supported partially by CRRN, CSFN/SM and INFN.
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Notarrigo, S., Porto, F., Rubbino, A. et al. The25Mg(3He,α)24Mg reaction at incident energies between 9 and 13 MeV. Nuov Cim A 35, 33–44 (1976). https://doi.org/10.1007/BF02730058
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DOI: https://doi.org/10.1007/BF02730058