Pionic fusion in light-ion systems

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In order to study the role of pions in the nuclear interaction, two pionic fusion experiments have been performed using the AGOR accelerator facility at KVI. Pionic fusion is a highly coherent process in which two nuclei fuse to a united nucleus and the available centre-of-mass energy is emitted in the pion channel. The examined reactions were 3He+4He-->pi0+7Be and 4He+6Li-->pi0+10B* and both reactions were performed at beam energies about 10 MeV above the coherent pion production threshold (256 MeV and 236.4 MeV, respectively). In order to provide sensitivity to the full dynamics and relevant processes involved in the pionic fusion reaction, almost the full angular distributions of neutral pions have been determined. Using a phenomenological analysis of the angular distribution, the contributions of the Legendre Polynomials to produce the behaviour of the angular distribution have been studied. The results of this analysis confirm the importance of the clustering correlations for both reactions. The mass dependence of the pionic fusion reactions is in agreement
with the extrapolated results of the existing models to these reactions. In this thesis, the results of the 4He+6Li-->pi0+10B* measurement will be discussed.

	Title and contents
	Chapter 1
	Chapter 2
	Chapter 3
	Chapter 4
	Chapter 5
	Chapter 6
	Discussion and outlook
	Summary
	Samenvatting
	Publications
	Acknowledgements
	Bibliography
	Complete thesis

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