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.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2812 |
| Date | 15 May 2009 |
| Creators | Chen, Xinfeng |
| Contributors | Youngblood, Dave H. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation, text |
| Format | electronic, application/pdf, born digital |
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