Speaker
Mirko von Schmid
(Institut für Kernphysik, Technische Universität Darmstadt, Germany)
Description
EXL (EXotic nuclei studied in Light-ion induced reactions at storage rings) is a project within NUSTAR at FAIR [1, 2]. It aims for the investigation of light-ion induced direct reactions in inverse kinematics with radioactive ions in storage rings at GSI and at the future FAIR facility.
The heart of EXL will be its recoil detector array, a 4π-array of several layers of silicon detectors surrounding the internal target of a storage ring. Because of the demanding vacuum conditions inside a storage ring, all components have to be UHV (Ultra-High Vacuum) compatible. At the same time, an energy threshold as low as possible is vital for EXL which excludes the use of detector pockets with vacuum-window foils as these dead layers would inevitably raise the low-energy threshold. To meet both demands at the same time, we have developed a solution in which a first layer of DSSDs (Double-sided Silicon Strip Detectors) is used as the actual vacuum window – hence, an active vacuum window – which separates the UHV from an auxiliary vacuum with less demanding vacuum conditions where additional detectors, cablings and read-out electronics can be placed [3, 4]. With a first implementation of this concept using two DSSDs, we have performed an experiment at the ESR (Experimental Storage Ring) at GSI using 58Ni as well as radioactive 56Ni beams in which we have successfully measured the nuclear matter distribution of 56Ni by investigating elastic proton scattering in inverse kinematics [5, 6]. The experiment marks the first successful investigation of a nuclear reaction with a stored radioactive beam ever.
The contribution will detail the development of the UHV compatible detector array and discuss the performance of the detectors in the experiment.
This work was supported by BMBF (06DA9040I, 05P12RDFN8, 05P15RDFN1), the European Community FP7-Capacities, contract ENSAR № 262010, HIC for FAIR, GSI-RUG/KVI collaboration agreement and TU Darmstadt-GSI cooperation contract.
References
[1] http://www.rug.nl/kvi/Research/hnp/Research/EXL/index
[2] H.H. Gutbrod et al. (Eds.), FAIR Baseline Technical Report, ISBN-3-9811298-0-6, 2006.
[3] B. Streicher et al., Nucl. Instrum. Methods Phys. Res., Sect. A, 654(1):604, 2011.
[4] M. Mutterer et al., Physica Scripta T166, 014053.
[5] M. von Schmid et al., Physica Scripta T166, 014005.
[6] M. von Schmid, doctoral thesis (TU Darmstadt), 2015. http://tuprints.ulb.tu-darmstadt.de/5028/
Primary author
Mirko von Schmid
(Institut für Kernphysik, Technische Universität Darmstadt, Germany)
Co-authors
A. Krasznahorkay
(Institute for Nuclear Research, MTA-Atomki, Debrecen, Hungary)
A. L. Hartig
(Institut für Kernphysik, Technische Universität Darmstadt, Germany)
B. Streicher
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
C. Dimopoulou
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
C. Kozhuharov
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
C. Nociforo
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
C. Rigollet
(KVI-CART, University of Groningen, The Netherlands)
C. Scheidenberger
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
D. Nagae
(Department of Physics, University of Tsukuba, Japan)
D. Winters
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
F. Nolden
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
H. Geissel
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
H. Kollmus
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
H. Weick
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
I. Dillmann
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
J. C. Zamora Cardona
(Institut für Kernphysik, Technische Universität Darmstadt, Germany)
J. S. Winfield
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
J. Zenihiro
(RIKEN Nishina Center, Wako, Saitama, Japan)
K. Yue
(Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China)
L. Stuhl
(Institute for Nuclear Research, MTA-Atomki, Debrecen, Hungary)
M. A. Najafi
(KVI-CART, University of Groningen, The Netherlands)
M. Csatlós
(Institute for Nuclear Research, MTA-Atomki, Debrecen, Hungary)
M. Kuilman
(KVI-CART, University of Groningen, The Netherlands)
M. Mahjour Shafiei
(Department of Physics, University of Tehran, Iran)
M. Mutterer
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
M. N. Harakeh
(KVI-CART, University of Groningen, The Netherlands)
M. Steck
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
M. Thürauf
(Institut für Kernphysik, Technische Universität Darmstadt, Germany)
M. Träger
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
N. Kalantar Nayestanaki
(KVI-CART, University of Groningen, The Netherlands)
O. Kiselev
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
P. Egelhof
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
P. J. Woods
(Institute for Particle and Nuclear Physics, University of Edinburgh, UK)
R. Gernhäuser
(Physik-Department E12, Technische Universität München, Germany)
S. Bagchi
(KVI-CART, University of Groningen, Netherlands)
S. Bönig
(Institut für Kernphysik, Technische Universität Darmstadt, Germany)
S. Ilieva
(Institut für Kernphysik, Technische Universität Darmstadt, Germany)
S. Litvinov
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
S. Roy
(KVI-CART, University of Groningen, The Netherlands)
T. Furuno
(Division of Physics and Astronomy, Kyoto University, Japan)
T. Kröll
(Institut für Kernphysik, Technische Universität Darmstadt, Germany)
T. Uesaka
(RIKEN Nishina Center, Wako, Saitama, Japan)
T. Yamaguchi
(Department of Physics, Saitama University, Sakura-ku, Saitama, Japan)
U. Popp
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
V. Eremin
(Ioffe Physical-Technical Institute, St. Petersburg, Russia)
X. C. Le
(Institute for Nuclear Science and Technology, Vietnam Atomic Energy Institute, Vietnam)
Y. A. Litvinov
(GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany)
