Study of Deformation Effects in the Charged Particle Emission from 46Ti.pdf

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Study of Deformation Effects in the Charged Particle Emission from 46Ti.pdf

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Study of Deformation Effects in the Charged Particle Emission from 46Ti

a r X i v : n u c l - e x / 0 4 1 2 0 4 2 v 1 2 0 D e c 2 0 0 4 Study of Deformation Effects in the Charged Particle Emission from 46Ti? ? M. Brekiesza, P. Papkab,c, A. Maja, M. Kmiecika, C. Beckb, P. Bednarczyka,d, J. Gre?bosza, F. Haasb, W. Me?czyn?skia, V. Rauchb, M. Rousseaub, A. Sa?nchez i Zafrab, J. Styczen?a, S. Thummerere, M. Zie?blin?skia and K. Zubera aThe Niewodniczan?ski Institute of Nuclear Physics, PAN, Krako?w, Poland bIReS IN2P3-CNRS/Universite? Louis Pasteur, Strasbourg, France cDepartment of Physics, University of York, Heslington, United Kingdom dGesellschaft fu?r Schwerionenforschung, Darmstadt, Germany eHahn-Meitner Institute, Berlin, Germany The 46Ti? compound nucleus, as populated by the fusion-evaporation reaction 27Al + 19F at the bombarding energy of 144 MeV, has been in- vestigated by charged particle spectroscopy using the multidetector array ICARE at the VIVITRON tandem facility of the IReS (Strasbourg). The light charged particles have been measured in coincidence with evaporation residues. The CACARIZO code, a Monte Carlo implementation of the statistical-model code CASCADE, has been used to calculate the spectral shapes of evaporated α-particles which are compared with the experimental spectra. This comparison indicates the possible signature of large deforma- tions of the compound nucleus. PACS numbers: 25.70.Gh, 25.70.Jj, 25.70.Mn, 24.60.Dr 1. Introduction In the recent years, there have been a number of experimental and the- oretical studies aimed at understanding the effects of large deformations in the case of light-mass nuclei. The very elongated prolate or triaxial shapes were deduced from the spectra of the Giant Dipole Resonance (GDR) from the decay of 46Ti? [1, 2] and 45Sc? [3]. The results were consistent with predictions of the LSD (Lublin-Strasbourg Drop) model [4, 5], in which the ? Presented at the XXXIX Zakopane School of Physics - International Symposium ”Atomic nuclei at extreme values of temperature, spin and i