Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 29: Nuclear Structure/Spectroscopy V
HK 29.6: Vortrag
Mittwoch, 10. März 2004, 16:00–16:15, A
Complex nuclear-structure phenomena revealed from the nuclide production in fragmentation reactions — •Maria Valentina Ricciardi1, Anatoly V. Ignatyuk2, Aleksandra Kelic1, Paolo Napolitani1, Fanny Rejmund3, Karl-Heinz Schmidt1, and Orlin Yordanov1 — 1GSI, Planckstr. 1, 64291 Darmstadt, Germany — 2IPPE, Bondarenko Squ. 1, 249020 Obninsk, Russia — 3IPN, 91406 Orsay, France
We report on a fine structure, manifested as an odd-even effect, observed in the formation cross sections of light residual nuclei produced from the projectile fragmentation of 1 A GeV 238U nuclei in a titanium target at GSI. The structure was analysed for cuts along different values of N-Z, revealing a very complex behaviour. In contrast to the prominent structural features found in nuclear fission and in transfer reactions, this structure seems to be insensitive to the excitation energy induced in the reaction. We suggest that the structure is created at the end of the evaporation process due to structural effects in nuclear binding and in the nuclear level density. The vanishing of the even-odd staggering for heavy nuclei is explained by gamma emission. Finally we discuss the peculiarity of the N=Z chain of residues.