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HK: Fachverband Hadronen und Kerne

HK 36: Nuclear Structure and Dynamics I

HK 36.6: Vortrag

Dienstag, 17. März 2009, 17:45–18:00, H-ZO 40

Transfer reactions with ⁸Li — •Elisabeth Tengborn — Subatomic Physics, Chalmers University of Technology, Sweden

Exotic light nuclei are being studied through a campaign of transfer-reaction experiments at REX-ISOLDE, CERN. The present aim is to investigate the structure of neutron-rich lithium isotopes. The scientific motivation for these studies is manifold. First, the isotopic chain of lithium ends in the emblematic two-neutron halo nucleus ¹¹Li. Second, spectroscopic factors for known and hitherto unobserved excited states are being predicted by ab-initio and shell model calculations and can thus be tested experimentally. Third, these loosely bound systems present a challenge to our modelling of reaction mechanisms.

The project described here is a benchmark experiment where a beam of ⁸Li was impinging on a deuterated polypropylene target in inverse kinematics. This mainly gives information on ⁹Li through a one neutron pick-up reaction, which in the inverse kinematics corresponds to a (d,p)-reaction. However, the reaction channels (d,d) and (d,t) can also be studied. The goal of the experiment is to study the reaction mechanism and the coupling to the continuum.

All steps (calibration of the detectors, background subtraction, acceptance corrections, excitation energies and simulations) leading up to angular distributions on an absolute scale have been performed. The angular distributions have been compared with theoretical models and the presentation will include a discussion about the reaction mechanism of direct versus compound reactions.