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HK: Physik der Hadronen und Kerne

HK 5: Kernphysik/Spektroskopie I - Exotische Kerne

HK 5.7: Gruppenbericht

Montag, 19. März 2001, 18:30–19:00, D

Nuclear Matter Distributions of Neutron-Rich Li-Isotopes from Elastic Proton Scattering in Inverse Kinematics — • A.V. Dobrovolsky — PNPI, St. Petersburg, Gatchina — GSI Darmstadt

The method of proton elastic scattering at intermediate energies, which was already proven for neutron-rich helium isotopes to be well suited for obtaining accurate and detailed information on nuclear matter distributions of halo nuclei, was recently applied for the investigation of neutron-rich Li-isotopes using secondary beams from Fragment Separator at GSI at an energy near 700 MeV/u. Along with the radioactive ^8,9,11Li isotopes the stable ⁶Li nucleus was investigated to allow for a comparison of matter distributions between the A=6 nuclei ⁶Li and ⁶He. The experimental setup consisted of the ionization chamber IKAR which served simultaneously as high-pressure hydrogen target and as recoil proton detector, and a forward spectrometer for tracking and identifying the projectile nuclei.

For establishing the nuclear matter distributions measured differential cross-sections have been compared to those calculated with the aid of the Glauber multiple scattering theory, using various parametrizations for the nucleon density distributions as the input. The results on the nuclear matter radii and the matter distributions are presented, and the significance of the data for the halo structure is discussed. The nuclear matter distribution deduced for the ¹¹Li nucleus exhibits a very pronounced halo structure. The present data allow also for a sensitive test of theoretical model calculations on the structure of the neutron-rich nuclei. A few examples are presented.