Measurement of the 235U(n, f) cross section relative to the 6Li(n, t) and 10B(n,α) standards from thermal to 170 keV neutron energy range at n_TOF

被引：0

作者：

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

Cosentino, L. ^{[1
]}

Barbagallo, M. ^{[2
]}

Colonna, N. ^{[2
]}

Mengoni, A. ^{[3
,4
]}

Massimi, C. ^{[4
,5
]}

Lo Meo, S. ^{[3
,4
]}

Finocchiaro, P. ^{[1
]}

Aberle, O. ^{[6
]}

Andrzejewski, J. ^{[7
]}

Audouin, L. ^{[8
]}

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

Balibrea, J. ^{[11
]}

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
]}

Cortes, G. ^{[17
]}

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

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
]}

Furman, V. ^{[23
]}

Goebel, 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
]}

机构：

[1] INFN, 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] CERN, European Org Nucl Res, Geneva, Switzerland

[7] Univ Lodz, Lodz, Poland

[8] Univ Paris Saclay, Univ Paris Sud, CNRS, Inst Phys Nucl,IN2P3, 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, Barcelona, Spain

[18] Univ Seville, Seville, Spain

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

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

[21] PSI, Villigen, Switzerland

[22] Inst Super Tecn, Lisbon, Portugal

[23] JINR, Dubna, Russia

[24] Goethe Univ Frankfurt, Frankfurt, Germany

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

[26] JAEA, Tokai, Ibaraki, Japan

[27] Joint Res Ctr, European Commiss, 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] PTB, Bundesallee 100, D-38116 Braunschweig, Germany

[32] INFN, Lab Nazl Legnaro, Legnaro, PD, 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] BARC, Mumbai, Maharashtra, India

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

来源：

EUROPEAN PHYSICAL JOURNAL A | 2019年 / 55卷 / 07期

基金：

英国工程与自然科学研究理事会;

关键词：

NUCLEAR-DATA; SCIENCE;

D O I：

10.1140/epja/i2019-12802-7

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

.The U-235(n, f ) cross section was measured at n_TOF relative to Li-6(n, t) and B-10(n,alpha) , with high resolution ( L=183.49(2) m) and in a wide energy range (25meV-170keV) with 1.5% systematic uncertainty, making use of a stack of six samples and six silicon detectors placed in the neutron beam. This allowed us to make a direct comparison of the yields of the U-235(n, f ) and of the two reference reactions under the same experimental conditions, and taking into account the forward/backward emission asymmetry. A hint of an anomaly in the 10-30keV neutron energy range had been previously observed in other experiments, indicating a cross section systematically lower by several percent relative to major evaluations. The present results indicate that the cross section in the 9-18keV neutron energy range is indeed overestimated by almost 5% in the recently released evaluated data files ENDF/B-VIII.0 and JEFF3.3, as a consequence of a 7% overestimate in a single GMA node in the IAEA reference file. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. The results here reported may lead to a reduction of the uncertainty in the 1-100keV neutron energy region. Finally, from the present data, a value of 249.7 +/- 1.4( stat )+/- 0.94( syst ) beV has been extracted for the cross section integral between 7.8 and 11eV, confirming the value of 247.5 +/- 3 beV recently established as a standard.

引用

页数：19

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