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HK: Fachverband Hadronen und Kerne

HK 36: Nuclear Structure and Dynamics I

HK 36.7: Talk

Tuesday, March 17, 2009, 18:00–18:15, H-ZO 40

Halo effects in the Scattering of 11Li on heavy target — •Olof Tengblad¹, Maria Jose Garcia Borge¹, Joaquin Gomez Camacho², and Ismael Martel Bravo³ — ¹IEM-CSIC, Madrid, Spain — ²Univ. Sevilla, Spain — ³Univ. Huelva, Spain

Halo nuclei are composed by a core nucleus and one or two loosely bound neutrons. Due to the loosely bound structure, they should be easily polarizable. Thus, in the presence of a strong electric field, the nucleus will be distorted, so that, with respect to the centre of mass of the nucleus, the halo neutrons will move opposite to the electric field, while the positively charged core will move in the direction of the field. The B(E1) distribution is a measurement of the importance of polarizability.

The phenomenon of dipole polarizability affect strongly the elastic scattering of halo nuclei on heavy targets, even at energies below the Coulomb barrier, where the nuclear force should not be important. Two effects are relevant: First, Coulomb break-up will reduce the elastic cross sections. Second, the distortion of the wave function generated by the displacement of the charged core with respect to the centre of mass of the nucleus will reduce the Coulomb repulsion, and with it the elastic cross sections.

We report here on an experiment, performed in October 2008 at the ISAC-II facility at TRIUMF Vancouver Canada, measuring the elastic differential cross section of 11Li on 208Pb at 2.2 to 3.0 MeV/u laboratory energy. We have observed and quantified the reduction of the differential cross sections compared to the Rutherford cross section.