Time-of-flight and activation experiments on 147Pm and 171Tm for astrophysics

Guerrero, C. and Lerendegui-Marco, J. and Domingo-Pardo, C. and Casanovas, A. and Dressler, R. and Halfon, S. and Heinitz, S. and Kivel, N. and Köster, U. and Paul, M. and Quesada-Molina, J. M. and Schumann, D. and Tarifeño-Saldivia, A. and Tessler, M. and Weissman, L. and Aberle, O. and Andrzejewski, J. and Audouin, L. and Bacak, M. and Balibrea, J. and Barbagallo, M. and Becvar, F. and Berthoumieux, E. and Billowes, J. and Bosnar, Damir and Brown, A. and Caamaño, M. and Calviño, F. and Calviani, M. and Cano-Ott, D. and Cardella, R. and Cerutti, F. and Chen, Y. H. and Chiaveri, E. and Colonna, N. and Cortés, G. and Cortés-Giraldo, M. A. and Cosentino, L. and Damone, L. A. and Diakaki, M. and Dupont, E. and Durán, I. and Fernández-Domínguez, B. and Ferrari, A. and Ferreira, P. and Finocchiaro, P. and Göbel, K. and García, A. R. and Gawlik, A. and Gilardoni, S. and Glodariu, T. and Gonçalves, I. F. and González, E. and Griesmayer, E. and Gunsing, F. and Harada, H. and Heyse, J. and Jenkins, D. G. and Jericha, E. and Käppeler, F. and Kadi, Y. and Kalamara, A. and Kavrigin, P. and Kimura, A. and Kivel, N. and Kokkoris, M. and Krticka, M. and Kurtulgil, D. and Leal-Cidoncha, E. and Lederer, C. and Leeb, H. and Lo Meo, S. and Lonsdale, S. J. and Macina, D. and Marganiec, J. and Martínez, T. and Masi, A. and Massimi, C. and Mastinu, P. and Mastromarco, M. and Maugeri, E. A. and Mazzone, A. and Mendoza, E. and Mengoni, A. and Milazzo, P. M. and Mingrone, F. and Musumarra, A. and Negret, A. and Nolte, R. and Oprea, A. and Patronis, N. and Pavlik, A. and Perkowski, J. and Porras, I. and Praena, J. and Radeck, D. and Rauscher, T. and Reifarth, R. and Rout, P. C. and Rubbia, C. and Ryan, J. A. and Sabaté-Gilarte, M. and Saxena, A. and Schillebeeckx, P. and Smith, A. G. and Sosnin, N. V. and Stamatopoulos, A. and Tagliente, G. and Tain, J. L. and Tassan-Got, L. and Tsinganis, A. and Valenta, S. and Vannini, G. and Variale, V. and Vaz, P. and Ventura, A. and Vlachoudis, V. and Vlastou, R. and Wallner, A. and Warren, S. and Weiss, C. and Woods, P. J. and Wright, T. and Žugec, Petar (n_TOF Collaboration) (2017) Time-of-flight and activation experiments on 147Pm and 171Tm for astrophysics. In: ND 2016: International Conference on Nuclear Data for Science and Technology. EPJ Web of Conferences. No. 146. Art. No. 01007, September 11–16, 2016, Bruges, Belgija.

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Abstract

The neutron capture cross section of several key unstable isotopes acting as branching points in the s-process are crucial for stellar nucleosynthesis studies, but they are very challenging to measure due to the difficult production of sufficient sample material, the high activity of the resulting samples, and the actual (n, γ) measurement, for which high neutron fluxes and effective background rejection capabilities are required. As part of a new program to measure some of these important branching points, radioactive targets of 147Pm and 171Tm have been produced by irradiation of stable isotopes at the ILL high flux reactor. Neutron capture on 146Nd and 170Er at the reactor was followed by beta decay and the resulting matrix was purified via radiochemical separation at PSI. The radioactive targets have been used for time-of-flight measurements at the CERN n_TOF facility using the 19 and 185 m beam lines during 2014 and 2015. The capture cascades were detected using a set of four C6D6 scintillators, allowing to observe the associated neutron capture resonances. The results presented in this work are the first ever determination of the resonance capture cross section of 147Pm and 171Tm. Activation experiments on the same 147Pm and 171Tm targets with a high-intensity 30 keV quasi-Maxwellian flux of neutrons will be performed using the SARAF accelerator and the Liquid-Lithium Target (LiLiT) in order to extract the corresponding Maxwellian Average Cross Section (MACS). The status of these experiments and preliminary results will be presented and discussed as well.

Item Type: Conference or Workshop Item (Lecture)
Keywords: n_TOF, CERN, time-of-flight, activation, neutron capture, 147Pm, 171Tm
Date: 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: © The Authors, published by EDP Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 20 Nov 2017 09:02
Last Modified: 20 Nov 2017 09:02
URI: http://digre.pmf.unizg.hr/id/eprint/5711

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