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Radiative neutron capture on Pu-242 in the resonance region at the CERN n_TOF-EAR1 facility

Lerendegui-Marco, J. and Guerrero, C. and Mendoza, E. and Quesada, J. M. and Eberhardt, K. and Junghans, A. R. and Krticka, M. and Aberle, O. and Andrzejewski, J. and Audouin, L. and Becares, V. and Bacak, M. and Balibrea, J. and Barbagallo, M. and Barros, S. and Becvar, F. and Beinrucker, C. and Berthoumieux, E. and Billowes, J. and Bosnar, D. and Brugger, M. and Caamano, M. and Calvino, F. and Calviani, M. and Cano-Ott, D. and Cardella, R. and Casanovas, A. and Castelluccio, D. M. and Cerutti, F. and Chen, Y. H. and Chiaveri, E. and Colonna, N. and Cortes, G. and Cortes-Giraldo, M. A. and Cosentino, L. and Damone, L. A. and Diakaki, M. and Dietz, M. and Domingo-Pardo, C. and Dressler, R. and Dupont, E. and Duran, I. and Fernandez-Dominguez, B. and Ferrari, A. and Ferreira, P. and Finocchiaro, P. and Furman, V. and Goebel, K. and Garcia, A. R. and Gawlik, A. and Glodariu, T. and Goncalves, I. F. and Gonzalez-Romero, E. and Goverdovski, A. and Griesmayer, E. and Gunsing, F. and Harada, H. and Heftrich, T. and Heinitz, S. and Heyse, J. and Jenkins, D. G. and Jericha, E. and Kaeppeler, F. and Kadi, Y. and Katabuchi, T. and Kavrigin, P. and Ketlerov, V. and Khryachkov, V. and Kimura, A. and Kivel, N. and Kokkoris, M. and Leal-Cidoncha, E. and Lederer, C. and Leeb, H. and Lo Meo, S. and Lonsdale, S. J. and Losito, R. and Macina, D. and Marganiec, J. and Martinez, T. and Massimi, C. and Mastinu, P. and Mastromarco, M. and Matteucci, F. and Maugeri, E. A. and Mengoni, A. and Milazzo, P. M. and Mingrone, F. and Mirea, M. and Montesano, S. and Musumarra, A. and Nolte, R. and Oprea, A. and Patronis, N. and Pavlik, A. and Perkowski, J. and Porras, J. I. and Praena, J. and Rajeev, K. and Rauscher, T. and Reifarth, R. and Riego-Perez, A. and Rout, P. C. and Rubbia, C. and Ryan, J. A. and Sabate-Gilarte, M. and Saxena, A. and Schillebeeckx, P. and Schmidt, S. and Schumann, D. and Sedyshev, P. and Smith, A. G. and Stamatopoulos, A. and Tagliente, G. and Tain, J. L. and Tarifeno-Saldivia, A. 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 Weigand, M. and Weiss, C. and Wolf, C. and Woods, P. J. and Wright, T. and Zugec, P.. (2018) Radiative neutron capture on Pu-242 in the resonance region at the CERN n_TOF-EAR1 facility. Physical Review C, 97 (2). 024605.

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Abstract

The spent fuel of current nuclear reactors contains fissile plutonium isotopes that can be combined with uranium to make mixed oxide (MOX) fuel. In this way the Pu from spent fuel is used in a new reactor cycle, contributing to the long-term sustainability of nuclear energy. However, an extensive use of MOX fuels, in particular in fast reactors, requires more accurate capture and fission cross sections for some Pu isotopes. In the case of Pu-242 there are sizable discrepancies among the existing capture cross-section measurements included in the evaluations (all from the 1970s) resulting in an uncertainty as high as 35% in the fast energy region. Moreover, postirradiation experiments evaluated with JEFF-3.1 indicate an overestimation of 14% in the capture cross section in the fast neutron energy region. In this context, the Nuclear Energy Agency (NEA) requested an accuracy of 8% in this cross section in the energy region between 500 meV and 500 keV. This paper presents a new time-of-flight capture measurement on Pu-242 carried out at n_TOF-EAR1 (CERN), focusing on the analysis and statistical properties of the resonance region, below 4 keV. The Pu-242(n, gamma) reaction on a sample containing 95(4) mg enriched to 99.959% was measured with an array of four C6D6 detectors and applying the total energy detection technique. The high neutron energy resolution of n_TOF-EAR1 and the good statistics accumulated have allowed us to extend the resonance analysis up to 4 keV, obtaining new individual and average resonance parameters from a capture cross section featuring a systematic uncertainty of 5%, fulfilling the request of the NEA.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:2469-9985
e-ISSN:2469-9993
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:28 May 2018 06:51
Deposited On:28 May 2018 06:51

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