Showing papers by "Benedicte Million published in 2007"
TL;DR: In this article, the first excited 2 + state of 36Ca was identified by its γ-decay, exploiting the two-step fragmentation technique at the FRS-RISING setup at GSI.
24 citations
Journal Article•
University of Copenhagen1, Autonomous University of Madrid2, University of Oslo3, University of Bonn4, Hungarian Academy of Sciences5, University of Debrecen6, University of Milan7, Centre national de la recherche scientifique8, Lawrence Berkeley National Laboratory9, Polish Academy of Sciences10, University of Manchester11, Royal Institute of Technology12, University of Liverpool13, University of Naples Federico II14, University of Camerino15
TL;DR: In this paper, the Euroball-IV γ-gamma detector array with ancillary charged particle detector array DIAMANT was used to study the residues of the fusion reaction and verify the existence of predicted hyperdeformed rotational bands.
Abstract: The Euroball-IV \gamma -detector array, equipped with the ancillary charged particle detector array DIAMANT was used to study the residues of the fusion reaction $^{64}$Ni + $^{64}$Ni \Rightarrow $^{128}$Ba at E_{beam} = 255 and 261 MeV, in an attempt to reach the highest angular momentum and verify the existence of predicted hyperdeformed rotational bands. No discrete hyperdeformed bands were identified, but nevertheless a breakthrough was obtained through a systematic search for rotational ridge structures with very large moments of inertia J(2) \ge 100 {\mathchar h}^2 MeV^(-1), in agreement with theoretical predictions for hyperdeformed shapes. Evidence for hyperdeformation was obtained by charged particle + \gamma -ray gating, selecting triple correlated ridge structures in the continuum of each of the nuclei, $^ {118}$Te, $^{124}$Xe and $^{124,125}$Cs. In 7 additional nuclei, rotational ridges were also identified with J(2) = 71--77 {\mathchar h}^2 MeV^(-1), which most probably correspond to superdeformed shape. The angular distributions of the emitted charged particles show an excess in forward direction over expectations from pure compound evaporation, which may indicate that in-complete fusion plays an important role in the population of very elongated shapes.
1 citations