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

S. Amaducci; L. Cosentino; M. Barbagallo; N. Colonna; A. Mengoni; C. Massimi; S. Lo Meo; P. Finocchiaro; O. Aberle; J. Andrzejewski; L. Audouin; M. Bacak; J. Balibrea; F. Bečvář; E. Berthoumieux; J. Billowes; D. Bosnar; A. Brown; M. Caamaño; F. Calviño; M. Calviani; D. Cano-Ott; R. Cardella; A. Casanovas; F. Cerutti; Y. H. Chen; E. Chiaveri; G. Cortés; M. A. Cortés-Giraldo; L. A. Damone; M. Diakaki; C. Domingo-Pardo; R. Dressler; E. Dupont; I. Durán; B. Fernández-Domínguez; A. Ferrari; P. Ferreira; V. Furman; K. Göbel; A. R. García; A. Gawlik; S. Gilardoni; T. Glodariu; I. F. Gonçalves; E. González-Romero; E. Griesmayer; C. Guerrero; F. Gunsing; H. Harada; S. Heinitz; J. Heyse; D. G. Jenkins; E. Jericha; F. Käppeler; Y. Kadi; A. Kalamara; P. Kavrigin; A. Kimura; N. Kivel; I. Knapova; M. Kokkoris; M. Krtička; D. Kurtulgil; E. Leal-Cidoncha; C. Lederer; H. Leeb; J. Lerendegui-Marco; S. J. Lonsdale; D. Macina; A. Manna; J. Marganiec; T. Martínez; A. Masi; P. Mastinu; M. Mastromarco; E. A. Maugeri; A. Mazzone; E. Mendoza; P. M. Milazzo; F. Mingrone; A. Musumarra; A. Negret; R. Nolte; A. Oprea; N. Patronis; A. Pavlik; J. Perkowski; I. Porras; J. Praena; J. M. Quesada; D. Radeck; T. Rauscher; R. Reifarth; C. Rubbia; J. A. Ryan; M. Sabaté-Gilarte; A. Saxena; P. Schillebeeckx; D. Schumann; P. Sedyshev; A. G. Smith; N. V. Sosnin; A. Stamatopoulos; G. Tagliente; J. L. Tain; A. Tarifeño-Saldivia; L. Tassan-Got; S. Valenta; G. Vannini; V. Variale; P. Vaz; A. Ventura; V. Vlachoudis; R. Vlastou; A. Wallner; S. Warren; C. Weiss; P. J. Woods; T. Wright; P. Žugec

doi:10.1140/epja/i2019-12802-7

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

S. Amaducci, L. Cosentino, M. Barbagallo, N. Colonna, A. Mengoni, C. Massimi, S. Lo Meo, P. Finocchiaro, O. Aberle, J. Andrzejewski, L. Audouin, M. Bacak, J. Balibrea, F. Bečvář, E. Berthoumieux, J. Billowes, D. Bosnar, A. Brown, M. Caamaño, F. CalviñoM. Calviani, D. Cano-Ott, R. Cardella, A. Casanovas, F. Cerutti, Y. H. Chen, E. Chiaveri, G. Cortés, M. A. Cortés-Giraldo, L. A. Damone, M. Diakaki, C. Domingo-Pardo, R. Dressler, E. Dupont, I. Durán, B. Fernández-Domínguez, A. Ferrari, P. Ferreira, V. Furman, K. Göbel, A. R. García, A. Gawlik, S. Gilardoni, T. Glodariu, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, H. Harada, S. Heinitz, J. Heyse, D. G. Jenkins, E. Jericha, F. Käppeler, Y. Kadi, A. Kalamara, P. Kavrigin, A. Kimura, N. Kivel, I. Knapova, M. Kokkoris, M. Krtička, D. Kurtulgil, E. Leal-Cidoncha, C. Lederer, H. Leeb, J. Lerendegui-Marco, S. J. Lonsdale, D. Macina, A. Manna, J. Marganiec, T. Martínez, A. Masi, P. Mastinu, M. Mastromarco, E. A. Maugeri, A. Mazzone, E. Mendoza, P. M. Milazzo, F. Mingrone, A. Musumarra, A. Negret, R. Nolte, A. Oprea, N. Patronis, A. Pavlik, J. Perkowski, I. Porras, J. Praena, J. M. Quesada, D. Radeck, T. Rauscher, R. Reifarth, C. Rubbia, J. A. Ryan, M. Sabaté-Gilarte, A. Saxena, P. Schillebeeckx, D. Schumann, P. Sedyshev, A. G. Smith, N. V. Sosnin, A. Stamatopoulos, G. Tagliente, J. L. Tain, A. Tarifeño-Saldivia, L. Tassan-Got, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, V. Vlachoudis, R. Vlastou, A. Wallner, S. Warren, C. Weiss, P. J. Woods, T. Wright, P. Žugec

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Abstract

The 235U(n, f) cross section was measured at n_TOF relative to 6Li(n, t) and 10B(n,α) , 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 235U(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) b·eV has been extracted for the cross section integral between 7.8 and 11eV, confirming the value of 247. 5 ± 3 b·eV recently established as a standard.

Original language	English
Article number	120
Number of pages	19
Journal	The European Physical Journal A (EPJ A)
Volume	55
Issue number	7
DOIs	https://doi.org/10.1140/epja/i2019-12802-7
Publication status	Published - 1 Jul 2019

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Amaducci, S., Cosentino, L., Barbagallo, M., Colonna, N., Mengoni, A., Massimi, C., Lo Meo, S., Finocchiaro, P., Aberle, O., Andrzejewski, J., Audouin, L., Bacak, M., Balibrea, J., Bečvář, F., Berthoumieux, E., Billowes, J., Bosnar, D., Brown, A., Caamaño, M., ... Žugec, P. (2019). 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. The European Physical Journal A (EPJ A), 55(7), Article 120. https://doi.org/10.1140/epja/i2019-12802-7

@article{07cb5f74effa438d803d3773ce0e6f03,

title = "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",

abstract = "The 235U(n, f) cross section was measured at n_TOF relative to 6Li(n, t) and 10B(n,α) , 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 235U(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) b·eV has been extracted for the cross section integral between 7.8 and 11eV, confirming the value of 247. 5 ± 3 b·eV recently established as a standard.",

author = "S. Amaducci and L. Cosentino and M. Barbagallo and N. Colonna and A. Mengoni and C. Massimi and {Lo Meo}, S. and P. Finocchiaro and O. Aberle and J. Andrzejewski and L. Audouin and M. Bacak and J. Balibrea and F. Be{\v c}v{\'a}{\v r} and E. Berthoumieux and J. Billowes and D. Bosnar and A. Brown and M. Caama{\~n}o and F. Calvi{\~n}o and M. Calviani and D. Cano-Ott and R. Cardella and A. Casanovas and F. Cerutti and Chen, {Y. H.} and E. Chiaveri and G. Cort{\'e}s and Cort{\'e}s-Giraldo, {M. A.} and Damone, {L. A.} and M. Diakaki and C. Domingo-Pardo and R. Dressler and E. Dupont and I. Dur{\'a}n and B. Fern{\'a}ndez-Dom{\'i}nguez and A. Ferrari and P. Ferreira and V. Furman and K. G{\"o}bel and Garc{\'i}a, {A. R.} and A. Gawlik and S. Gilardoni and T. Glodariu and Gon{\c c}alves, {I. F.} and E. Gonz{\'a}lez-Romero and E. Griesmayer and C. Guerrero and F. Gunsing and H. Harada and S. Heinitz and J. Heyse and Jenkins, {D. G.} and E. Jericha and F. K{\"a}ppeler and Y. Kadi and A. Kalamara and P. Kavrigin and A. Kimura and N. Kivel and I. Knapova and M. Kokkoris and M. Krti{\v c}ka and D. Kurtulgil and E. Leal-Cidoncha and C. Lederer and H. Leeb and J. Lerendegui-Marco and Lonsdale, {S. J.} and D. Macina and A. Manna and J. Marganiec and T. Mart{\'i}nez and A. Masi and P. Mastinu and M. Mastromarco and Maugeri, {E. A.} and A. Mazzone and E. Mendoza and Milazzo, {P. M.} and F. Mingrone and A. Musumarra and A. Negret and R. Nolte and A. Oprea and N. Patronis and A. Pavlik and J. Perkowski and I. Porras and J. Praena and Quesada, {J. M.} and D. Radeck and T. Rauscher and R. Reifarth and C. Rubbia and Ryan, {J. A.} and M. Sabat{\'e}-Gilarte and A. Saxena and P. Schillebeeckx and D. Schumann and P. Sedyshev and Smith, {A. G.} and Sosnin, {N. V.} and A. Stamatopoulos and G. Tagliente and Tain, {J. L.} and A. Tarife{\~n}o-Saldivia and L. Tassan-Got and S. Valenta and G. Vannini and V. Variale and P. Vaz and A. Ventura and V. Vlachoudis and R. Vlastou and A. Wallner and S. Warren and C. Weiss and Woods, {P. J.} and T. Wright and P. {\v Z}ugec",

year = "2019",

month = jul,

day = "1",

doi = "10.1140/epja/i2019-12802-7",

language = "English",

volume = "55",

journal = "The European Physical Journal A (EPJ A)",

issn = "1434-6001",

publisher = "Springer Nature Link",

number = "7",

}

Amaducci, S, Cosentino, L, Barbagallo, M, Colonna, N, Mengoni, A, Massimi, C, Lo Meo, S, Finocchiaro, P, Aberle, O, Andrzejewski, J, Audouin, L, Bacak, M, Balibrea, J, Bečvář, F, Berthoumieux, E, Billowes, J, Bosnar, D, Brown, A, Caamaño, M, Calviño, F, Calviani, M, Cano-Ott, D, Cardella, R, Casanovas, A, Cerutti, F, Chen, YH, Chiaveri, E, Cortés, G, Cortés-Giraldo, MA, Damone, LA, Diakaki, M, Domingo-Pardo, C, Dressler, R, Dupont, E, Durán, I, Fernández-Domínguez, B, Ferrari, A, Ferreira, P, Furman, V, Göbel, K, García, AR, Gawlik, A, Gilardoni, S, Glodariu, T, Gonçalves, IF, González-Romero, E, Griesmayer, E, Guerrero, C, Gunsing, F, Harada, H, Heinitz, S, Heyse, J, Jenkins, DG, Jericha, E, Käppeler, F, Kadi, Y, Kalamara, A, Kavrigin, P, Kimura, A, Kivel, N, Knapova, I, Kokkoris, M, Krtička, M, Kurtulgil, D, Leal-Cidoncha, E, Lederer, C, Leeb, H, Lerendegui-Marco, J, Lonsdale, SJ, Macina, D, Manna, A, Marganiec, J, Martínez, T, Masi, A, Mastinu, P, Mastromarco, M, Maugeri, EA, Mazzone, A, Mendoza, E, Milazzo, PM, Mingrone, F, Musumarra, A, Negret, A, Nolte, R, Oprea, A, Patronis, N, Pavlik, A, Perkowski, J, Porras, I, Praena, J, Quesada, JM, Radeck, D, Rauscher, T, Reifarth, R, Rubbia, C, Ryan, JA, Sabaté-Gilarte, M, Saxena, A, Schillebeeckx, P, Schumann, D, Sedyshev, P, Smith, AG, Sosnin, NV, Stamatopoulos, A, Tagliente, G, Tain, JL, Tarifeño-Saldivia, A, Tassan-Got, L, Valenta, S, Vannini, G, Variale, V, Vaz, P, Ventura, A, Vlachoudis, V, Vlastou, R, Wallner, A, Warren, S, Weiss, C, Woods, PJ, Wright, T & Žugec, P 2019, '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', The European Physical Journal A (EPJ A), vol. 55, no. 7, 120. https://doi.org/10.1140/epja/i2019-12802-7

TY - JOUR

T1 - 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

AU - Amaducci, S.

AU - Cosentino, L.

AU - Barbagallo, M.

AU - Colonna, N.

AU - Mengoni, A.

AU - Massimi, C.

AU - Lo Meo, S.

AU - Finocchiaro, P.

AU - Aberle, O.

AU - Andrzejewski, J.

AU - Audouin, L.

AU - Bacak, M.

AU - Balibrea, J.

AU - Bečvář, F.

AU - Berthoumieux, E.

AU - Billowes, J.

AU - Bosnar, D.

AU - Brown, A.

AU - Caamaño, M.

AU - Calviño, F.

AU - Calviani, M.

AU - Cano-Ott, D.

AU - Cardella, R.

AU - Casanovas, A.

AU - Cerutti, F.

AU - Chen, Y. H.

AU - Chiaveri, E.

AU - Cortés, G.

AU - Cortés-Giraldo, M. A.

AU - Damone, L. A.

AU - Diakaki, M.

AU - Domingo-Pardo, C.

AU - Dressler, R.

AU - Dupont, E.

AU - Durán, I.

AU - Fernández-Domínguez, B.

AU - Ferrari, A.

AU - Ferreira, P.

AU - Furman, V.

AU - Göbel, K.

AU - García, A. R.

AU - Gawlik, A.

AU - Gilardoni, S.

AU - Glodariu, T.

AU - Gonçalves, I. F.

AU - González-Romero, E.

AU - Griesmayer, E.

AU - Guerrero, C.

AU - Gunsing, F.

AU - Harada, H.

AU - Heinitz, S.

AU - Heyse, J.

AU - Jenkins, D. G.

AU - Jericha, E.

AU - Käppeler, F.

AU - Kadi, Y.

AU - Kalamara, A.

AU - Kavrigin, P.

AU - Kimura, A.

AU - Kivel, N.

AU - Knapova, I.

AU - Kokkoris, M.

AU - Krtička, M.

AU - Kurtulgil, D.

AU - Leal-Cidoncha, E.

AU - Lederer, C.

AU - Leeb, H.

AU - Lerendegui-Marco, J.

AU - Lonsdale, S. J.

AU - Macina, D.

AU - Manna, A.

AU - Marganiec, J.

AU - Martínez, T.

AU - Masi, A.

AU - Mastinu, P.

AU - Mastromarco, M.

AU - Maugeri, E. A.

AU - Mazzone, A.

AU - Mendoza, E.

AU - Milazzo, P. M.

AU - Mingrone, F.

AU - Musumarra, A.

AU - Negret, A.

AU - Nolte, R.

AU - Oprea, A.

AU - Patronis, N.

AU - Pavlik, A.

AU - Perkowski, J.

AU - Porras, I.

AU - Praena, J.

AU - Quesada, J. M.

AU - Radeck, D.

AU - Rauscher, T.

AU - Reifarth, R.

AU - Rubbia, C.

AU - Ryan, J. A.

AU - Sabaté-Gilarte, M.

AU - Saxena, A.

AU - Schillebeeckx, P.

AU - Schumann, D.

AU - Sedyshev, P.

AU - Smith, A. G.

AU - Sosnin, N. V.

AU - Stamatopoulos, A.

AU - Tagliente, G.

AU - Tain, J. L.

AU - Tarifeño-Saldivia, A.

AU - Tassan-Got, L.

AU - Valenta, S.

AU - Vannini, G.

AU - Variale, V.

AU - Vaz, P.

AU - Ventura, A.

AU - Vlachoudis, V.

AU - Vlastou, R.

AU - Wallner, A.

AU - Warren, S.

AU - Weiss, C.

AU - Woods, P. J.

AU - Wright, T.

AU - Žugec, P.

PY - 2019/7/1

Y1 - 2019/7/1

N2 - The 235U(n, f) cross section was measured at n_TOF relative to 6Li(n, t) and 10B(n,α) , 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 235U(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) b·eV has been extracted for the cross section integral between 7.8 and 11eV, confirming the value of 247. 5 ± 3 b·eV recently established as a standard.

AB - The 235U(n, f) cross section was measured at n_TOF relative to 6Li(n, t) and 10B(n,α) , 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 235U(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) b·eV has been extracted for the cross section integral between 7.8 and 11eV, confirming the value of 247. 5 ± 3 b·eV recently established as a standard.

UR - http://www.scopus.com/inward/record.url?scp=85069686674&partnerID=8YFLogxK

U2 - 10.1140/epja/i2019-12802-7

DO - 10.1140/epja/i2019-12802-7

M3 - Article

AN - SCOPUS:85069686674

SN - 1434-6001

VL - 55

JO - The European Physical Journal A (EPJ A)

JF - The European Physical Journal A (EPJ A)

IS - 7

M1 - 120

ER -

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

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