Speaker
Christoph Seiffert
(Technische Universitaet Darmstadt (DE))
Description
Even though ISOLDE can provide a wide range of isotopes from many different elements,
extraction of some elements still proves to be difficult. This is especially true for refractory
and chemically reactive elements like carbon, boron and refractory metals. Although
extraction of these elements as more volatile molecules was suggested many decades ago,
extraction has only been successful for some of these elements up to now. In particular
beams of 8B are requested for a long time by a variety of experiments. However, until
recently extraction of sufficient yields was not achieved at any ISOL facility.
This talk will present important considerations for the development of new ISOL beams and
will give detailed information on investigations performed for the development of boron
beams.
These considerations include calculations of production cross sections, the chemical
equilibrium between boron and materials present in the target container as well as diffusion
and ionization characteristics.
The results obtained from these studies were exploited in two prototype targets and tested at
ISOLDE during the online period 2015, leading to the first ever ISOL beam extraction of 8B
as 8BF_2^+.
Author
Christoph Seiffert
(Technische Universitaet Darmstadt (DE))
Co-authors
Alexander Gottberg
(CERN / CENBG / CSIC)
Basil Chacko Gonsalves
(University of Huddersfield (GB))
Frank Wienholtz
(Ernst-Moritz-Arndt-Universitaet (DE))
Joao Pedro Ramos
(Ecole Polytechnique Federale de Lausanne (CH))
Jochen Ballof
(Johannes-Gutenberg-Universitaet Mainz (DE))
Melanie Delonca
(CERN)
Miguel Madurga Flores
(CERN)
Olof Tengblad
(Consejo Superior de Investigaciones Cientificas (CSIC) (ES))
Razvan Lica
(IFIN-HH Bucharest (RO))
Ricardo Manuel Dos Santos Augusto
(Ludwig-Maximilians-Univ. Muenchen (DE))
Tania Manuela De Melo Mendonca
(CERN)
Thierry Stora
(CERN)
Thorsten Kroell
(Technische Universitaet Darmstadt (DE))
Yisel Martinez Palenzuela
(KU Leuven (BE))
alessia di pietro
(INFN)
