Giant resonance study by 6li scattering
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Nuclear incompressibility Knm is an important parameter in the nuclear matter equation of state (EOS). The locations of the isocalar giant monopole resonance (ISGMR) and giant dipole resonance (ISGDR) of nuclei are directly related to Knm and thus can give the most effective constraint on the value of the Knm. In order to determine Knm accurately, a systematic study of the ISGMR and ISGDR over a wide range of nuclei is necessary. Alpha inelastic scattering at small angles has been successfully used to study the ISGMR of heavy and medium nuclei where the monopole resonance is concentrated in a broad peak. For light nuclei (A<40), however, ISGMR strengths are more elusive because the resonance is fragmented and extends to excitation energies above 35 MeV. Other processes give a large physical background at high excitation energy in α inelastic scattering, which makes it difficult to extract strength distributions in this range. As an isoscalar projectile (N=Z), 6Li scattering could be an alternate way to study giant resonances. A better ratio between the resonance peak and the continuum is expected in 6Li scattering due to the low particle emitting threshold. Another important motivation for 6Li scattering study is to explore the possibility of expanding current research from stable nuclei to radioactive nuclei with inverse reactions using 6Li as a target. Data for elastic scattering of 240 MeV 6Li ions and inelastic scattering to low-lying states and giant resonances was taken for 24Mg, 28Si and 116Sn. A data analysis procedure was developed for double folding calculations. The optical potential parameters for 6Li + 24Mg, 6Li + 28Si and 6Li + 116Sn scattering systems were obtained by fitting elastic scattering data. Multipole analyses were carried out for inelastic scattering to high lying isoscalar giant resonances with multipolarities L=0 - 3. The results for the ISGMR and ISGQR are in agreement with those obtained with 240 MeV α scattering, however the agreement for the ISGDR and HEOR is not so good, indicating the uncertainty in extracting these strengths. This work has shown that 240 MeV 6Li scattering is a viable way to study the ISGMR and ISGQR and can be particularly useful in rare isotope studies where 6Li can be used as the target.
Chen, Xinfeng (2008). Giant resonance study by 6li scattering. Doctoral dissertation, Texas A&M University. Available electronically from