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Title of Journal: Nuov Cim A

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Abbravation: Il Nuovo Cimento A (1965-1970)

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Società Italiana di Fisica

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DOI

10.1016/0378-1097(77)90029-5

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1826-9869

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TheSuperscript12/SuperscriptC+Superscript12

Authors: A D Panagiotou
Publish Date: 2008/06/03
Volume: 37, Issue: 4, Pages: 370-384
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Abstract

The reaction12C+12C→α+20Ne was studied in the energy range of 45 to 52 MeV Energy spectra were obtained and compared Excitation functions for the first three levels in20Ne recorded in the energy range of 48 to 522 MeV exhibited strong fluctuations but also average crosssections larger than those expected by the 2I+1 rule Angular distributions to levels up to 1333 MeV excitation were obtained For some states with 8p4h configuration in particular they exhibited directtransfer characteristics Highspin states showed spin and configurationindependent distributions Evidence for a 10+state in24Mg at 39 MeV excitation is reported It is inferred that the reaction proceeds via directtransfer or doorway state and compoundnucleus mechanisms with the compoundsystem contribution being about 25 to 50 The existence of critical angular momenta in the formation of the compound nucleus24Mg is observed and discussedИсследуется реакция12C+12C→α+20Ne в области энергий от 45 до 52 МэВ Анализируются энергетические спектры Функции возбуждения для первых уровней в20Ne исследованные в области знергий от 48 до 522 МэВ обнаруживают сильные флуктуации но средние поперечные сечения оказываются больше чем следовало бы из правила 2I+1 Получаются угловые распределения вплоть до возбуждения 1333 МэВ Для некоторых состояний с 8p4h конфигурацией распределения обнаруживают характерные черты прямой передачи Для состояний с высшими спинами характерны распределения которые не зависят от конфигурации Обнаружено состояние 10+ в24Mg при возбуждении 39 МэВ Делается утверждение что рассматриваемая реакция происходит через прямую передачу и механизм компаундядра причем вклад компаундсистемы составляет от 25 до 50 Отмечается и обсуждается существование критического момента при образовании составного ядра24MgSi è studiata la reazione12C+12C→α+20Ne nellintervallo di energia da 45 a 52 MeV Si sono ottenuti e confrontati gli spettri di energia Le funzioni di eccitazione per i primi tre livelli in20Ne registrate nellintervallo denergia da 48 a 522 MeV hanno mostrato forti fluttuazioni ma anche sezioni durto medie più ampie di quelle aspettate dalla regola 2I+1 Si sono ottenute distribuzioni angolari a livelli fino a eccitazioni di 1333 MeV Per alcuni stati in particolare con configurazione 8p4h essi mostrano caratteristiche di trasferimento diretto Gli stati a spin alto mostrano distribuzioni indipendenti dalla configurazione e dallo spin Si fornisce una prova dello stato 10+ in24Mg ad uneccitazione di 39 MeV Si deduce che la reazione procede attraverso meccanismi di trasferimento diretto o stato della porta e di nucleo composto essendo il contributo del sistema composto circa dal 25 al 50 Si discute e si osserva lesistenza dellimpulso angolare critico nella formazione del nucleo composto24Mg

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