In-beam spectroscopy in the actinide region using an evaporation residue detector

W. Reviol, D. G. Sarantites, C. J. Chiara, M. Montero, O. L. Pechenaya

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations


The evaporation-residue counter HERCULES, an auxiliary detector for GAMMASPHERE to perform spectroscopy in the presence of a large fission background, is described. Results from a typical experiment using the 26Mg + 198Pt → 224Th* reaction at 128 MeV are discussed. The discussion focuses on the new 220Th level scheme. The simplex feature (alternating-parity levels) persists up to the highest spins observed. However, 220Th exhibits a more vibrational-like behavior than the heavier Th isotopes. A novel interpretation for 220Th based on a picture of tidal waves on a reflection- asymmetric nuclear surface is briefly reviewed. Finally, the identification of excited states in 219Th is discussed.

Original languageEnglish
Pages (from-to)1547-1555
Number of pages9
JournalActa Physica Polonica B
Issue number4
StatePublished - Apr 1 2007
Event41st Zakopane Conference on Nuclear Physics - Trends in Nuclear Physics - Zakopane, Poland
Duration: Sep 4 2006Sep 10 2006


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