Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 66: Struktur und Dynamik von Kernen
HK 66.4: Vortrag
Freitag, 23. März 2012, 15:00–15:15, P 4
Decay spectroscopy of neutron-rich nuclei with the CAITEN detector — •Konrad Steiger — Physik-Department E12, Technische Universität München
An experiment in fall 2010 at the RIBF (Radioactive Ion Beam Factory at RIKEN, Japan) investigated the neutron-rich nuclei in the neighborhood of 30Ne and 36Mg. These nuclei were produced by relativistic projectile fragmentation of a 345 AMeV 48Ca primary beam which was delivered from the superconducting ring cyclotron SRC with an average intensity of 70 pnA. The secondary cocktail beam was separated and identified with the BigRIPS fragment separator and the ZeroDegree spectrometer. The unambiguous particle identification was achieved by measuring the energy loss, time of flight and magnetic rigidity event-by-event. The identified fragments were implanted in the CAITEN detector (Cylindrical Active Implantation Target for Efficient Nuclear-decay study). The main part of this detector is a 4 × 104-fold segmented plastic scintillator with the shape of a hollow cylinder. To reduce background events the scintillator was moved continuously in axial and vertical direction (similar to a tape-transporting system). Implantations and decays were correlated in time and space. γ-rays were detected with three germanium clover detectors. For the first time β-delayed gammas were measured in the neutron-rich isotopes 36−38Si. The status of the analysis and preliminary results including new half-life values and tentative level schemes for these very exotic nuclei will be presented. Supported by BMBF (06MT9156) and DFG (EXC 153, KR2326/2-1).