München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 37: Kern- und Teilchen-Astrophysik

HK 37.2: Vortrag

Mittwoch, 22. März 2006, 16:45–17:00, E

The "weak" r-process around doubly semi-magic ¹¹⁰Zr — •F. Schertz^1,2, J. Pereira², H. Schatz², A. Wöhr³, and K.-L. Kratz^1,3 — ¹Inst. für Kernchemie & HGF-VISTARS, Univ. Mainz, Germany — ²NSCL/MSU & JINA, USA — ³ISNAP, Univ. of Notre Dame, USA

Independently, the phenomenon of ”shell quenching” far from β-stability as well as the possible local occurrance of tetrahedral shapes, predict a new subshell at N=70. Combined with the well-known subshell-closure at Z=40, ¹¹⁰Zr would become a (quasi-) spherical r-process isotope, replacing the classical N=82 ”waiting point” ¹²²Zr. In order to verify these predictions, a dedicated experiment has been performed at the A1900 fragment separator of NSCL/MSU. First results and their implications on the ”weak” r-process will be presented.