München 2006 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Physik der Hadronen und Kerne

HK 26: Kern- und Teilchen-Astrophysik

HK 26.4: Vortrag

Dienstag, 21. März 2006, 17:45–18:00, E

β-decay properties of r-process nuclei in the ¹³²Sn region — •R. Kessler¹, J. Pereira², H. Schatz², M. Hellström³, T. Faestermann⁴, and K.-L. Kratz¹ — ¹Inst. für Kernchemie & HGF-VISTARS, Univ. Mainz, Germany — ²NSCL/MSU & JINA, USA — ³GSI, Germany — ⁴TU München, Germany

Masses and β-decay properties of extremely neutron-rich nuclei in the region around the doubly-magical ¹³²Sn are important for the understanding and modeling of the r-process, especially with respect to the A≃130 solar-system abundance peak. For this purpose, under E040 two experiments have been performed at FRS and ESR at GSI, using projectile fission of a 750 MeV/u ²³⁸U beam impinging on a Pb target. We report here on the measurements of T_1/2 and P_n values at the FRS with the Munich β-detector system and the Mainz 4π neutron longcounter. Several new isotopes north-east of ¹³²Sn have been identified, among them the r-process “waiting pointss” ¹³⁶Sn, ¹³⁷Sb and ¹⁴⁰Te.