Probing proton halo effects in the 8B+64Zn collision around the Coulomb barrier

Physics Letters B

M.J.G. Borge¹  P. Figuera²  A. Di Pietro³  T. Davinson⁴  A. Perea⁵  A.M. Sánchez-Benítez⁶  J.P. Fernández-García⁷  L. Acosta⁷  Jin Lei⁸  S. Viñals⁹  L.M. Fraile^1,10  R. Spartà^1,11  M. La Cognata^1,12  G. Bruni^1,13  A.M. Moro^1,14  O. Tengblad^1,14  B. Jonson^1,15  I. Martel^1,15  J.D. Ovejas^1,15  J. Cederkäll^1,16  N. Soić^1,17  D. Galaviz^1,18  J. Halkjaer Jensen^1,19 

[1]Centro Nacional de Aceleradores, Universidad de Sevilla, Junta de Andalucía-CSIC, 41092 Sevilla, Spain

[2]Corresponding author at: Dipartamento di Fisica e Astronomia, Universitá di Catania, via S. Sofia 64, I-95123 Catania, Italy.

[3]INFN, Laboratori Nazionali del Sud, via S. Sofia 62, 1-95123 Catania, Italy

[4]INFN, Sezione di Catania, via S. Sofia 64, 1-95125 Catania, Italy

[5]IPARCOS, Facultad de Ciencias Físicas, CEI Moncloa, 28040 Madrid, Spain

[6]ISOLDE, EP Department, CERN, CH-1211 Geneva-23, Switzerland

[7]Departamento de FAMN, Universidad de Sevilla, Apartado 1065, 41080 Sevilla, Spain

[8]Departamento de Física Aplicada, Universidad de Huelva, Campus de El Carmen, E-21071 Huelva, Spain

[9]Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus, Denmark

[10]Department of Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden

[11]Dipartamento di Fisica e Astronomia, Universitá di Catania, via S. Sofia 64, I-95123 Catania, Italy

[12]

[13]Grupo de Física Nuclear &INFN Sezione di Pisa, Largo Bruno Pontecorvo 3, 56127 Pisa, Italy

[14]INFN, Laboratori Nazionali del Sud, via S. Sofia 62, 1-95123 Catania, Italy

[15]Instituto de Estructura de la Materia, CSIC, Serrano 113 bis, E-28006 Madrid, Spain

[16]Instituto de Física, Universidad Nacional Autónoma de México, A.P. 20-364, Mexico City 01000, Mexico

[17]LIP - Laboratory for Instrumentation and Experimental Particle Physics, Lisbon, Portugal

[18]Physics Department, Lund University, Box 118, SE-221 00, Lund, Sweden

[19]School of Physics and Astronomy, University of Edinburgh, JCMB, Peter Guthrie Tait Road, Edinburgh EH9 3FD, United Kingdom of Great Britain and Northern Ireland

关键词: Halo nuclei;    Elastic scattering;    Breakup;   

DOI  :  

来源: DOAJ

【 摘 要 】

Proton halo effects in the 8B+64Zn reaction at an energy around 1.5 times the Coulomb barrier have been studied at HIE-ISOLDE CERN using, for the first time, the only existing postaccelerated 8B beam. This, together with the use of a high granularity and large solid angle detection system, allowed for a careful mapping of the elastic angular distribution, especially in the Coulomb-nuclear interference region. Contrary to what is observed for the one-neutron halo nucleus 11Be on the same target in a similar energy range, the analysis of the elastic scattering angular distribution shows only a modest suppression of the Coulomb-nuclear interference peak, with no remarkable enhancement of the total reaction cross-section. Inclusive angular and energy distributions of 7Be produced in direct reaction processes have also been measured. The comparison of these data with the results of theoretical calculations for the elastic and non-elastic breakup contributions indicate that both processes are important. Overall, the experimental data suggest a 8B collision dynamics at the barrier very different from the one of neutron halo nuclei, showing only modest effects of coupling to continuum. This behaviour can be interpreted as due to the presence of the additional Coulomb interactions halo-core and halo-target together with the presence of the centrifugal barrier felt by the valence proton of 8B.

【 授权许可】

Unknown