Tübingen 2003 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 7: Kern- und Teilchen-Astrophysik I

HK 7.9: Vortrag

Montag, 17. März 2003, 18:15–18:30, F

At the limits: Very neutron-rich isotopes in the ¹³²Sn region — •Oliver Arndt¹, B.A. Brown², I. Dillmann¹, K.-L. Kratz¹, P. Möller³, B. Pfeiffer¹, W.B. Walters⁴, and A. Wöhr⁴ — ¹Inst. f. Kernchemie, Univ. Mainz — ²Dept. of Physics & Astronomy and NSCL, MSU, USA — ³Theortical Division, LANL, USA — ⁴Dept. of Chemistry, Univ. of Maryland, USA

Using highest possible selectivity in isotope production and detection at the CERN-ISOLDE facility, we have measured beta-decay properties of a number of new r-process nuclides in the Z-region below doubly-magic ¹³²Sn. Delayed-neutron data on ^129,130Ag, ^129−133Cd and ^133−135In [1-3] will be compared to new QRPA and OXBASH predictions. We have also deduced the half-life of the long predicted isomer of ¹²⁹Cd.

Consequences for the formation of the A≃130 solar-system r-abundance peak will be discussed.

[1] K.-L. Kratz et al., Hyperfine Interactions 129 (2000) 185

[2] M. Hannawald et al., Phys. Rev. C 62 (2000) 054301

[3] I.Dillmann et al., Eur. Phys. J. A 13 (2002) 281