Cross sections of exotic light nuclei
Authors
Date
2019Copyright
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Tässä pro gradu-tutkielmassa perehdytään kokeeseen, jossa eksoottisten 6He, 7−9Li,
10−12Be ja 14B ytimien vaikutusaloja 28Si, 181Ta ja 59Co kohtioihin, mitattiin 10–60
AMeV alueella. Tutkimuksen tavoitteena oli kerätä lisää dataa aiemmin havaituista
poikkeavuuksista, näiden ytimien kokonaisvaikutusaloissa. Erityisesti mielenkiinnon
kohteena olivat äkillisesti pienillä energioilla kohoavat vaikutusalat, tietyissä eksoottisissa
helium ja litium ytimissä. Nämä poikkeamat ovat oletettavasti ytimien halo-
ja klusteri-rakenteiden seurausta. Tuloksia voidaan käyttää tarkempien mikroskooppisten
ydinmallien kehittämisessä. Lisäksi niitä on mahdollista hyödyntää uusien ja paremmin säteilyä kestävien puolijohteiden suunnittelussa.
Tutkielman pääpainona on käytetty koeasetelma ja analyysimenetelmät. Cross sections for 6 He, 7−9Li, 10−12Be and 14B nuclei on 28Si, 181Ta and 59Co targets
were measured at 10 – 60 AMeV energy range using modified transmission method.
In total, 120 cross sections were extracted. The purpose of the experiment was to
investigate an unexpected behavior of cross sections found in certain exotic nuclei.
Especially of interest was a sudden growth, observed in heavy helium and lithium
isotopes at low energies. These features are presumably manifestations of a halo and
cluster-like structures in these nuclei. Obtained results may yield relevant data for
the development of more accurate microscopic nuclear models and radiation resistant
electronics. In this work, a detailed description is given of the measuring setup and
the methods used in the experiment.
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- Pro gradu -tutkielmat [29060]
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