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Transfer of neutron-proton pairs in heavy-ion interactions

Передача нейтрон-протонных пар при вэаимодействиях тяжелых ионов

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Il Nuovo Cimento A (1965-1970)

Summary

Neutron-proton transfer reactions have been studied on12C,13C,14N,15N,16O and20Ne targets in the (11B,9Be) reaction induced by 116 MeV11B ions. The reactions are characterized by a high degree of selectivity, and evidence has been obtained for a particularly simple direct mechanism involving simultaneous surface transfer of the nucleon pair. TheT = 1 reaction channel is significantly inhibited, and the reaction spectra and angular distributions are similar to those of the corresponding alpha-particle-induced neutron-proton transfer reactions. DWBA calculations including finite range and full recoil reproduce the observed angular distributions, and a Hauser-Feshbach analysis confirms the dominant direct character of these reactions.

Riassunto

Si sono studiate le reazioni di trasferimento neutrone-protone su bersagli di12C,13C,14N,15N,16O e20Ne nella reazione (11B,9Be) indotta dagli ioni11B di 116MeV. Le reazioni sono caratterizzate da un alto grado di selettività e si è ottenuta la prova di un meccanismo diretto particolarmente semplice che coinvolge il simultaneo trasferimento superficiale della coppia di nucleoni. Il canaleT = 1 della reazione è stato inibito in modo significativo, e gli spettri della reazione e le distribuzioni angolari sono simili a quelli delle corrispondenti reazioni di trasferimento neutrone-protone indotte da particelle alfa. I calcoli DWBA che includono l’intervallo finito e il pieno rinculo riproducono le distribuzioni angolari osservate, e un’analisi di Hauser-Feshbach conferma il carattere diretto predominante di queste reazioni.

Реэюме

Исследуются реакции с передачей нейтрон-протонной пары на мищенях12C,13C,14N,15N,16O и20Ne в реакции (11B,9Be), индуцированной ионами11B с знергией 116 МзВ. Рассматриваемые реакции характериэуются высокой степенью селективности. Получено подтверждение для особенно простого прямого механиэма, включаюшего спонтанную поверхностную передачу пары нуклонов. Канал реакцииT = 1 окаэывается сушественно подавленным и спектры реакции и угловые распределения соответствуют спектрам и распределениям в реакциях с передачей нейтрон-протонных пар, которые индуцированы альфа-частицами. Вычисления DWВА, учитываюшие конечный радиус и полную отдачу, воспроиэводят наблюденные угловые распределения. Аналиэ Хауэера-Фещбаха подтверждает прямой характер зтих реакций.

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Author notes

  1. J. E. Poth

    Present address: Department of Physics, Miami University, O. 45056, Oxford

Authors and Affiliations

  1. Wright Nuclear Structure Laboratory, Yale University, New Haven, Conn

    J. E. Poth, M. W. Sachs & D. A. Bromley

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  1. J. E. Poth
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  2. M. W. Sachs
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  3. D. A. Bromley
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Additional information

Work supported by U.S. Atomic Energy Commission Contract AT(11-1)-3074.

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Poth, J.E., Sachs, M.W. & Bromley, D.A. Transfer of neutron-proton pairs in heavy-ion interactions. Nuov Cim A 28, 215–239 (1975). https://doi.org/10.1007/BF02820881

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