Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 23: Kernphysik/Spektroskopie III

HK 23.6: Vortrag

Mittwoch, 19. März 2003, 12:15–12:30, A

Two Neutron Transfer Reactions with ¹⁰Be Targets* — •W. Schwerdtfeger¹, C. Alvarez¹, A. Bergmaier², G. Dollinger², T. Faestermann², D. Habs¹, T. Kröll², R. Krücken², H.J. Maier¹, T. Morgan¹, P. Thirolf¹, W. von Oertzen³, and H. Wolter¹ — ¹Sektion Physik, Ludwig Maximilians Universität München — ²E12, Technische Universität München — ³Hahn Meitner Institut, Berlin

Transfer reactions enable to investigate the shape coexistence of e.g. deformed and spherical 0⁺ states in Mg isotopes around the island of inversion at N ≈ 20. 2n transfer reactions from a radioactive ¹⁰Be target provide a distinct trigger via the two α particles ejected from the intermediate ⁸Be reaction product. The ¹⁰Be targets (t_1/2 = 1.6 · 10⁶ a) with a thickness of ≈ 110 µ g/cm² were produced by micro-evaporation module onto a carbon backing of ≈ 40 µ g/cm². These ¹⁰Be targets will also enable a wide range of transfer experiments, e.g. on the isospin dependance of the 2n pairing gap or resonances in ¹⁰He. In order to estimate the cross section of the 2n transfer ¹⁰Be(³⁰Mg,³²Mg)⁸Be which is intended to be performed at REX-ISOLDE the preparatory reactions ¹⁰Be(²⁶Mg,²⁸Mg)⁸Be and ¹⁰Be(¹⁶O,¹⁸O)⁸Be have been studied at the Q3D magnet spectrograph in Garching. For a better understanding theoretical DWBA-calculations using the Coupled-Channel Code FRESCO [1] have been performed. *Supported by DFG under contract number HA 1101/6-1

[1] I.J. Thompson, Comp. Phys. Rep. 7 (1987) pp 167-212