4.7 Article

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

Journal

PHYSICS LETTERS B
Volume 820, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.physletb.2021.136477

Keywords

Halo nuclei; Elastic scattering; Breakup

Funding

  1. European Com-mission Horizon 2020 framework trans-national access program of the EU project ENSAR2 [654002]
  2. Istituto Nazionale di Fisica Nucleare (INFN)
  3. UKRI STFC
  4. Spanish Funding Agency [PGC2018-095640-B-100, FIS2017-88410-P, PDI2019-104390GB-100, FPA2016-77689-C2-1-R, PGC2018-096994-B-C21, PGC2018-096994-B-C22, RTI2018-098868-B-I00]
  5. DGAPA [PAPIIT-IN107820]
  6. CONACYT [314857]
  7. CERN associates program
  8. Portuguese FCT [CERN/FIS-PAR/0005/2017]

Ask authors/readers for more resources

The proton halo effects in the B-8+Zn-64 reaction at an energy around 1.5 times the Coulomb barrier were studied. The results show that the collision dynamics of B-8 at the barrier is very different from neutron halo nuclei, with only modest effects of coupling to continuum.
Proton halo effects in the B-8+Zn-64 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 B-8 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 Be-11 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 Be-7 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 B-8 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 B-8. (C) 2021 The Authors. Published by Elsevier B.V.

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