Scattering of He on Pb at energies around the Coulomb barrier
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1 Scattering of on Pb at energies around the Coulomb barrier 20 G. Marquínez-Durán1, I. Martel1, K. Rusek2, A.M. Sánchez-Benítez1, L. Acosta3 1 University of Huelva, Spain A. Soltan Institute for Nuclear Studies Warsaw, Poland 2 3 Laboratori Nazionali del Sud, INFN Catania, Italy
2 Contents - INTRODUCTION AND MOTIVATIONS - EXPERIMENTAL SETUP - PRELIMINARY RESULTS - CONCLUSIONS
3 Motivations: why? is the lightest skin nucleus. Its structure and dynamics is not very well known. - Few scattering data at barrier energies is available at present. - There is still a lack of information concerning collective aspects as characteristic nuclear excitations, coupling between different reaction channels and neutron-core correlations. Previous works: - A. Navin et al., Phys. Rev. C70, (2004) - N. Keeley et al., Pyhs. Lett. B 646 (2007) A. Lemasson et al., Phys. Rev. C 2, (2010) - A. Lemasson et al., Phys. Lett. B 697 (2011)
4 Motivations: why? As compared to 6 (previously studied by our group): - Neutron layer larger but tighter. RMS Radius (fm) Rn Rp Rm ± ± ± ± ± ± ± ± ±0.03 Nucleus Tanihata et al., Phys. Lett. B 29 (1992) Binding energy for 1n and 2n systems are similar whereas in 6 the breakup of the 2n system from the alpha core is energetically favored. 1n and 2n separation energies (MeV) Nucleus S1n S2n These differences in geometry and binding energies should be reflected in the elastic and reaction cross sections.
5 What are we expecting for? - From energy and angular distribution of elastic scattered and 4 and 6 yields: - role of transfer and breakup channels Omitting coupling to the continuum states Coupling to the continuum states - coupling to continuum A.M. Sánchez-Benítez et al., Nucl. Phys. A 03, 30 (200) L. Acosta et al., Phys. Rev. C 4, (2011) - Information about spectroscopic factors for 1n and 2n.
6
7 Scattering of +20Pb at energies around the Coulomb barrier Investigate the differences in the dynamics of skin ( ) and halo (6) nuclei at energies around the Coulomb barrier. Possible reaction channels: Elastic scattering 4n+4 n+7* { n+n+6 n+n+6* n+n+2n+4 2n+6 +20Pb 2n+6* 2n+2n+4 t+213bi t+5h+20pb 216 G. Marquínez-Durán DREB12 Po { 4n+212Po 4+20Pb 3n+213Po 4+209Pb
8 Experiment E57S GANIL (I.Martel & K.Rusek) Study of the + 20Pb system at energies around the Coulomb barrier (1 and 22 MeV) PIP detector + Collimators I ~ 105 pps Target thickness ~ 1.7 mg/cm2 3 slits rotary collimator Pb Target 20 PIP detector + Fusion stack
9 Detection system concept Detection system developed at the University of Huelva (UHU) with the aim of studying structure and dynamics of exotic nuclei using nuclear reactions. Design requirements: - Symmetric position of telescopes (scattering angles / beam alignment) - Maximum angular range - Angular range overlapping between telescopes - Large solid angle Good angular resolution - Small size Plug & Play Concept 12 DSSSD Si detectors arranged in 6 particle telescopes (40 mm DE & 1 mm E) Total solid angle for the system: 26 % (4π srad)
10 Preliminary Results Forward Telescope lab=[21º,25º] Bottom Telescope lab=[73º,77º] 4 6 Prompt fusion 4 6 p,d,t G. Marquínez-Durán DREB12 4
11 Preliminary Results: Elastic scattering OM 23.5MeV J.S. Lilley NPA 342 (190) Mev A. Sánchez-Benítez et al. NPA 03 (200) 30 / L. Acosta et al. PRC 4, (2011) +20Pb New data!! CM!!!
12
13 Preliminary Results: 4 and 6 yields - - CDCC 6+20Pb 22MeV / K.Rusek (Private communication) DWBA (1) 6+20Pb 4 / A.Moro DWBA (1) 6+20Pb 4 / A.Moro 6 +20Pb 22MeV +20Pb 22MeV +20Pb 22Mev L. Acosta / PRC (2011) PRC 4, (2011). D. Escrig / NPA 792 (2007) 2. New data / 6 New data / 4
14 Summary and Conclusions In order to investigate the dynamics we studied the reaction +20Pb at energies around the Coulomb barrier at SPIRAL/GANIL in October A new detection system developed at the University of Huelva for the study of nuclear reactions induced by exotic nuclei was used for the first time during the experiment showing excellent performances. The preliminary analysis of the data shows: Strong absorption up to small angles which can be interpreted as a signature of long range reaction channels. Large production of 6 and 4 fragments via neutron transfer and breakup. Breakup channel seems to dominate at very forward angles whereas neutron transfer operates in most of the angular range.
15 Thanks to the E57S collaboration I. Martel1, K. Rusek5, L. Acosta1, M.A.G. Álvarez2, R. Berjillos1, M.J.G. Borge3, A. Chbihi4, C. Cruz3, M. Cubero3, J. Dueñas1, J.P. Fernández García2, B. Fernández Martínez2, J.L. Flores1, J. Gómez Camacho2, N. Keeley5, J.A. Labrador2, G. Marquínez-Durán1, M. Marques6, M.Mazzocco7, A. Pakou, V.V. Parkar1, N. Patronis, V. Pesudo3, D. Pierroutsakou9, R. Raabe10, A.M. Sánchez-Benítez1, R. Silvestri9, L.Standylo5, I. Strojek5, N.Soic11, O. Tengblad3, R. Wolski12, A.H. Ziad2 University of Huelva (Spain), 2CNA, Sevilla (Spain), 3CSIC, Madrid (Spain), 4GANIL (France), 5 University of Warsaw (Poland), 6LPC, Caen (France), 7INFN-LNL, Legnaro (Italy), University of Ioannina (Greece), 9INFN Napoli (Italy), 10Instituut voor Kern-en Stralingsfysica, Leuven (Belgium), 11 Rudjer Boskovic Institute (Croatia), 12Institute of Nuclear Physics (Poland) 1
16 Previous works Lemasson et al., PRC 2, (2010)
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