Münster 2002 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HK: Physik der Hadronen und Kerne
HK 45: Nuclear Physics / Spectroscopy VII
HK 45.1: Gruppenbericht
Donnerstag, 14. März 2002, 16:00–16:30, B
β-decay studies of exotic nuclei and states close to 100Sn : 94Ag and 100In — •C. Plettner — GSI, Darmstadt, Germany
Nuclei along the N=Z line up to the doubly-magic 100Sn have been subject to extensive experimental studies both in β decay and in-beam experiments. In various theoretical approaches the proton-neutron (πν) interaction in identical orbits has been addressed, which gives rise to a new S=1 pairing mode and, in stretched configurations, to spin-gap isomers. The interplay of mean field (single-particle energies), residual πν-interaction (empirical vs. realistic) and model space (core excitation) will be demonstrated for two key examples: •94Ag is the heaviest N=Z nucleus studied in detailed β-decay spectroscopy. It exhibits three β-decay parent states, namely the T=1, Iπ=0+, T1/2=29±1029 ms ground state [1], a T=0, Iπ=(7+), T1/2=0.36±3 s isomer and a T1/2=0.3±2 s, I>15 high-spin isomer. The latter is suspect to establish records both in spin (Iπ=21+) and excitation energy Ex>6 MeV among the known part of the Segré chart. •100In is the closest neighbour to 100Sn studied both in high-resolution and total absorption spectroscopy. Spin Iπ=7+ and T1/2=6.2±4 s were determined for its ground state, which is at variance with various shell model predictions.
[1] A. Stolz et al., Proc. PINGST 2000, Selected Topics on N=Z Nuclei, eds. D. Rudolph, M. Hellström, Lund, Sweden, LUIP003, Bloms i Lund, 2000, p.113