Production, separation and target preparation of 171Tm and 147Pm for neutron cross section measurements
Author:
Heinitz Stephan1, Maugeri Emilio A.1, Schumann Dorothea1, Dressler Rugard1, Kivel Niko1, Guerrero Carlos2, Köster Ullrich3, Tessler Moshe4, Paul Michael4, Halfon Shlomi5
Affiliation:
1. Paul Scherrer Institute , 5232 Villigen PSI , Switzerland 2. Universidad de Sevilla , Av. Reina Mercedes , 41012 Sevilla , Spain 3. Institut Laue-Langevin , 71 Av. de Martyrs , 38042 Grenoble , France 4. The Hebrew University of Jerusalem , 91904 Jerusalem , Israel 5. Soreq Nuclear Research Center , 81800 Yavne , Israel
Abstract
Abstract
The knowledge of the neutron capture cross sections of s-process branching point isotopes represents a basic requirement for the understanding of star evolution. Since such branching point isotopes are by definition radioactive, the measurement of their cross sections from thermal to stellar energies becomes a challenging task. Considerable amounts of material have to be produced, representing a significant radioactive hazard. We report here on the production and separation of 3.5 mg 171Tm from 240 mg 170Er2O3 and 72 μg 147Pm from 100 mg 146Nd2O3 irradiated at the ILL high flux reactor. Thin targets were prepared with high chemical and radioisotopic purity suitable for neutron capture measurements at n_TOF CERN and the SARAF-LiLiT facility.
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry
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