Measurement of the 235 U(n,f) cross section at n_TOF from thermal to 170 keV

被引：0

作者：

Amaducci, S. ^{[1
,35
]}

Aberle, O. ^{[6
]}

Andrzejewski, J. ^{[7
]}

Audouin, L. ^{[8
]}

Bacak, M. ^{[6
,9
,10
]}

Balibrea, J. ^{[11
]}

Barbagallo, M. ^{[2
]}

Becvar, F. ^{[12
]}

Berthoumieux, E. ^{[10
]}

Billowes, J. ^{[13
]}

Bosnar, D. ^{[14
]}

Brown, A. ^{[15
]}

Caamano, M. ^{[16
]}

Calvino, F. ^{[17
]}

Calviani, M. ^{[6
]}

Cano-Ott, D. ^{[11
]}

Cardella, R. ^{[6
]}

Casanovas, A. ^{[17
]}

Cerutti, F. ^{[6
]}

Chen, Y. H. ^{[8
]}

Chiaveri, E. ^{[6
,13
,18
]}

Colonna, N. ^{[2
]}

Cortes, G. ^{[17
]}

Cortes-Giraldo, M. A. ^{[18
]}

Cosentino, L. ^{[1
]}

Damone, L. A. ^{[2
,19
]}

Diakaki, M. ^{[10
]}

Domingo-Pardo, C. ^{[20
]}

Dressler, R. ^{[21
]}

Dupont, E. ^{[10
]}

Duran, I ^{[16
]}

Fernandez-Dominguez, B. ^{[16
]}

Ferrari, A. ^{[6
]}

Ferreira, P. ^{[22
]}

Finocchiaro, P. ^{[1
]}

Furman, V ^{[23
]}

Gobel, K. ^{[24
]}

Garcia, A. R. ^{[11
]}

Gawlik, A. ^{[7
]}

Gilardoni, S. ^{[6
]}

Glodariu, T. ^{[25
]}

Goncalves, I. F. ^{[22
]}

Gonzalez-Romero, E. ^{[11
]}

Griesmayer, E. ^{[9
]}

Guerrero, C. ^{[18
]}

Gunsing, F. ^{[6
,10
]}

Harada, H. ^{[26
]}

Heinitz, S. ^{[21
]}

Heyse, J. ^{[27
]}

Jenkins, D. G. ^{[15
]}

机构：

[1] Ist Nazl Fis Nucl, Lab Nazl Sud, Catania, Italy

[2] Ist Nazl Fis Nucl, Sez Bari, Bari, Italy

[3] Agenzia Nazl Nuove Tecnol ENEA, Bologna, Italy

[4] Ist Nazl Fis Nucl, Sez Bologna, Bologna, Italy

[5] Univ Bologna, Dipartimento Fis & Astron, Bologna, Italy

[6] European Org Nucl Res CERN, Geneva, Switzerland

[7] Univ Lodz, Lodz, Poland

[8] Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France

[9] Tech Univ Wien, Vienna, Austria

[10] Univ Paris Saclay, CEA Irfu, F-91191 Gif Sur Yvette, France

[11] Ctr Invest Energet Medioambientales & Tecnol CIEM, Madrid, Spain

[12] Charles Univ Prague, Prague, Czech Republic

[13] Univ Manchester, Manchester, Lancs, England

[14] Univ Zagreb, Fac Sci, Dept Phys, Zagreb, Croatia

[15] Univ York, York, N Yorkshire, England

[16] Univ Santiago de Compostela, Santiago De Compostela, Spain

[17] Univ Politecn Cataluna, Madrid, Spain

[18] Univ Seville, Seville, Spain

[19] Univ Bari, Dipartimento Fis, Bari, Italy

[20] Univ Valencia, CSIC, Inst Fis Corpuscular, Valencia, Spain

[21] Paul Scherrer Inst PSI, Villigen, Switzerland

[22] Inst Super Tecn, Lisbon, Portugal

[23] Joint Inst Nucl Res JINR, Dubna, Russia

[24] Goethe Univ Frankfurt, Frankfurt, Germany

[25] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania

[26] Japan Atom Energy Agcy JAEA, Tokai, Ibaraki, Japan

[27] European Commiss, Joint Res Ctr, Retieseweg 111, B-2440 Geel, Belgium

[28] Karlsruhe Inst Technol, IKP, Campus North, D-76021 Karlsruhe, Germany

[29] Natl Tech Univ Athens, Athens, Greece

[30] Univ Edinburgh, Sch Phys & Astron, Edinburgh, Midlothian, Scotland

[31] Phys Tech Bundesanstalt PTB, Bundesallee 100, D-38116 Braunschweig, Germany

[32] Ist Nazl Fis Nucl, Sez Legnaro, Legnaro, Italy

[33] CNR, Bari, Italy

[34] Ist Nazl Fis Nucl, Sez Trieste, Trieste, Italy

[35] Univ Catania, Dipartimento Fis & Astron, Catania, Italy

[36] Univ Ioannina, Ioannina, Greece

[37] Univ Vienna, Fac Phys, Vienna, Austria

[38] Univ Granada, Granada, Spain

[39] Univ Basel, Dept Phys, Basel, Switzerland

[40] Univ Hertfordshire, Ctr Astrophys Res, Hatfield, Herts, England

[41] Bhabha Atom Res Ctr BARC, Mumbai, Maharashtra, India

[42] Australian Natl Univ, Canberra, ACT, Australia

来源：

PROCEEDINGS OF THE 2019 INTERNATIONAL CONFERENCE ON APPLICATIONS OF NUCLEAR TECHNIQUES (CRETE19) | 2020年 / 50卷

关键词：

Standard; cross-section; neutrons; uranium; fission; n_TOF;

D O I：

10.1142/S2010194520600113

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The U-235(n, f) cross section plays a key role for nuclear physics due to its widespread use as a standard reference for neutron cross section measurements and for neutron flux measurements. Recent experimental data of the fission cross section have suggested the presence of discrepancies around 6-8% with respect to the most used libraries, precisely in the range between 10 keV and 30 keV. In order to shed light on this disagreement, an accurate measurement of the U-235(n,f) fission cross section has been performed at n_TOF facility @CERN, using the standard reactions Li-6(n,t) and B-10(n,alpha) as reference. A custom experimental setup based on a stack of silicon detectors sandwiched between pairs of U-235, Li-6 and B-10 targets, has been installed along the neutron beam line to intercept the same neutron flux, allowing the detection of the fission fragments and the products of the reference reactions at the same time. Such a technique allows calculation of the cross section via the "ratio method", by normalizing the U-235(n,f) reaction yields with respect to the reference reactions and to the recommended data in the IAEA libraries; in particular, the integral between 7.8 and 11 eV has been chosen. Accurate Monte Carlo simulations have allowed evaluation of the neutron absorption in the different layers, as well as the detection efficiency of each detector. The data are in excellent agreement with the standard values and highlight the overestimation of the U-235(n,f) cross section between 9 and 18 keV in the most recent libraries.

引用

页数：9

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