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Recoil separator ERNA: ion beam specifications

Rogalla, D. and Aliotta, M. and Barnes, C. A. and Campajola, L. and D'Onofrio, A. and Fritz, E. and Gialanella, L. and Greife, U. and Imbriani, G. and Ordine, A. and Ossmann, J. and Roca, V. and Rolfs, C. and Romanova, M. M. and Sabbarese, C. and Schürmann, D. and Schümann, F. and Strieder, F. and Theis, S. and Terrasi, F. and Trautvetter, H.P. (1999) Recoil separator ERNA: ion beam specifications. European Physical Journal A: Hadrons and Nuclei, 6 (4). pp. 471-477. ISSN 1434-6001. doi:10.1007/s100500050371.

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For improved measurements of the key astrophysical reaction ^(12)C(α,γ)^(16)O in inverted kinematics, a recoil separator ERNA is being developed at the 4 MV Dynamitron tandem accelerator in Bochum to detect directly the ^(16)O recoils with about 50% efficiency. Calculations of the ion beam optics including all filtering and focusing elements of ERNA are presented. Since the ^(12)C projectiles and the ^(16)O recoils have essentially the same momentum, and since the ^(12)C ion beam emerging from the accelerator passes through a momentum filter (analysing magnet), the ^(12)C ion beam must be as free as possible from ^(16)O contamination for ERNA to succeed. In the present work, the 16O contamination was reduced from a level of 1 × 10^(−11) to a level below 2 × 10^(−29) by the installation of Wien filters both before and after the analysing magnet. The measurement of these and other beam specifications involved other parts of the final ERNA layout – sequentially a Wien filter, a 60˚ dipole magnet, another Wien filter, and a ΔE-E telescope. The setup led to a measured suppression factor of 5 × 10^(−18) for the ^(12)C ion beam. The experiments also indicate that an almost free choice of the charge state for the ^(16)O recoils is possible in the separator.

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Additional Information:© 1999 Springer-Verlag. Received: 25 October 1999. Communicated by B. Povh. Supported in part by the Deutsche Forschungsgemeinschaft (Ro429/35-1) and the Istituto Nazionale di Fisica Nucleare (INFN).
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)Ro429/35-1
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20150915-072243717
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60237
Deposited By: Ruth Sustaita
Deposited On:15 Sep 2015 18:44
Last Modified:10 Nov 2021 22:31

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