Accelerated radioactive beams from REX-ISOLDE

O. Kester; T. Sieber; S. Emhofer; F. Ames; K. Reisinger; P. Reiter; P. G. Thirolf; R. Lutter; D. Habs; B. H. Wolf; G. Huber; P. Schmidt; A. N. Ostrowski; R. von Hahn; R. Repnow; J. Fitting; M. Lauer; H. Scheit; D. Schwalm; H. Podlech; A. Schempp; U. Ratzinger; O. Forstner; Fredrik Wenander; J. Cederkall; Thomas Nilsson; Mats Lindroos; H. O. U. Fynbo; S. Franchoo; U. C. Bergmann; M. Oinonen; J. Aysto; P. Van den Bergh; P. Van Duppen; M. Huyse; N. Warr; D. Weisshaar; J. Eberth; Björn Jonson; Göran Hugo Nyman; M. Pantea; H. Simon; G. Shrieder; A. Richter; Olof Tengblad; T. Davinson; P. J. Woods; G. Bollen; L. Weissmann; L. Liljeby; K. G. Rensfelt

doi:10.1016/S0168-583X(02)01886-4

Accelerated radioactive beams from REX-ISOLDE
Paper in proceedings, 2003

In 2001 the linear accelerator of the Radioactive beam EXperiment (REX-ISOLDE) delivered for the first time accelerated radioactive ion beams, at a beam energy of 2 MeV/u. REX-ISOLDE uses the method of charge-state breeding, in order to enhance the charge state of the ions before injection into the LINAC. Radioactive singly-charged ions from the on-line mass separator ISOLDE are first accumulated in a Penning trap, then charge bred to an A/q < 4.5 in an electron beam ion source (EBIS) and finally accelerated in a LINAC from 5 keV/u to energies between 0.8 and 2.2 MeV/u. Dedicated measurements with REXTRAP, the transfer line and the EBIS have been carried out in conjunction with the first commissioning of the accelerator. Thus the properties of the different elements could be determined for further optimization of the system. In two test beam times in 2001 stable and radioactive Na isotopes (Na-23-Na-26) have been accelerated and transmitted to a preliminary target station. There Ni-58- and Be-9- and H-2-targets have been used to study exited states via Coulomb excitation and neutron transfer reactions. One MINIBALL triple cluster detector was used together with a double sided silicon strip detector to detect scattered particles in coincidence with gamma-rays. The aim was to study the operation of the detector under realistic conditions with gamma-background from the beta-decay of the radioactive ions and from the cavities. Recently for efficient detection eight tripple Ge-detectors of MINIBALL and a double sided silicon strip detector have been installed. We will present the first results obtained in the commissioning experiments and will give an overview of realistic beam parameters for future experiments to be started in the spring 2002.

RIB facilities

ion

IONS

charge breeding

PENNING TRAP

REXTRAP

sources

radioactive beams

Penning trap

linear accelerator

beam transport

NONNEUTRAL PLASMAS

Author

O. Kester

Ludwig-Maximilians-Universität München

T. Sieber

Ludwig-Maximilians-Universität München

S. Emhofer

Ludwig-Maximilians-Universität München

F. Ames

Ludwig-Maximilians-Universität München

K. Reisinger

Ludwig-Maximilians-Universität München

P. Reiter

Ludwig-Maximilians-Universität München

P. G. Thirolf

Ludwig-Maximilians-Universität München

R. Lutter

Ludwig-Maximilians-Universität München

D. Habs

Ludwig-Maximilians-Universität München

B. H. Wolf

Johannes Gutenberg University Mainz

G. Huber

Johannes Gutenberg University Mainz

P. Schmidt

Johannes Gutenberg University Mainz

A. N. Ostrowski

Johannes Gutenberg University Mainz

R. von Hahn

Max Planck Society

R. Repnow

Max Planck Society

J. Fitting

Max Planck Society

M. Lauer

Max Planck Society

H. Scheit

Max Planck Society

D. Schwalm

Max Planck Society

H. Podlech

Goethe University Frankfurt

A. Schempp

Goethe University Frankfurt