A Medley with over ten years of (mostly) light-ion production measurements at The Svedberg Laboratory

Pomp, Stephan; Bevilacqua, Riccardo; Hayashi, Masateru; Hirayama, S.; Lecolley, F.R.; Marie, N.; Naitou, Y.; Tippawan, U.; Watanabe, Yukinobu; Andersson, Peter; Blomgren, J.; Gustavsson, Cecilia; Hjalmarsson, Anders; Prokofiev, Alexander V.; Simutkin, Vasily; Tengborn, Elisabeth; Tesinsky, Milan; Österlund, Michael; Kolozhvari, Anatoly

doi:10.1051/epjconf/20100807013

Cited by 9 publications

(8 citation statements)

References 7 publications

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“…For this, we will use the white neutron beam that is to be produced via the C(d,n) reaction and will allow accessing a neutron energy region stretching from about 1 to 30 MeV. The measurements are planned with an upgraded version of Medley [15,16] which will include PPAC detectors with good time resolution to determine the energy of the neutrons impinging on the sandwich target. The target is planned to consist of three layers: 235 U, CH 2 , and 238 U.…”

Section: Experimental Activitiesmentioning

confidence: 99%

Experiments and Theoretical Data for Studying the Impact of Fission Yield Uncertainties on the Nuclear Fuel Cycle with TALYS/GEF and the Total Monte Carlo Method

Pomp¹,

Al-Adili²,

Alhassan³

et al. 2015

Nuclear Data Sheets

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Section: Experimental Activitiesmentioning

confidence: 99%

Experiments and Theoretical Data for Studying the Impact of Fission Yield Uncertainties on the Nuclear Fuel Cycle with TALYS/GEF and the Total Monte Carlo Method

Pomp¹,

Al-Adili²,

Alhassan³

et al. 2015

Nuclear Data Sheets

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“…The Medley setup which has been used earlier at 96 and 175 MeV quasi-mono-energetic neutron energies [3][4][5] will have to be upgraded to cope with the continuous energy spectrum. Medley consists of a chamber about 1 m in diameter with eight detector telescopes at adjustable distances (typically ∼15 cm from target) and viewing angles ( Fig.…”

Section: Setup and Upgradementioning

confidence: 99%

Measuring Light-ion Production and Fission Cross Sections Normalised to H(n,p) Scattering at the Upcoming NFS Facility

Jansson

Gustavsson

Pomp

et al. 2014

Nuclear Data Sheets

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The Medley setup is planned to be moved to and used at the new neutron facility NFS where measurements of light-ion production and fission cross-sections are planned at 1-40 MeV. Medley has eight detector telescopes providing ∆E-∆E-E data, each consisting of two silicon detectors and a CsI(Tl) detector at the back. The telescope setup is rotatable and can be made to cover any angle. Medley has previously been used in many measurements at The Svedberg Laboratory (TSL) in Uppsala mainly with a quasi-mono-energetic neutron beam at 96 and 175 MeV.To be able to do measurements at NFS, which will have a white neutron beam, Medley needs to detect the reaction products with a high temporal resolution providing the ToF of the primary neutron. In this paper we discuss the design of the Medley upgrade along with simulations of the setup. We explore the use of Parallel Plate Avalanche Counters (PPACs) which work very well for detecting fission fragments but require more consideration for detecting deeply penetrating particles.

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“…The experimental setup, called Medley [1], is planned to be used to measure neutron-induced fission cross sections and light-ion production in two different experimental campaigns at the Neutrons For Science (NFS) facility [2]. Although the experiments share parts of their setups and share some experimental conditions, they also differ in some important aspects and are therefore to be regarded as two separate experiments.…”

Section: Introductionmentioning

confidence: 99%

“…Medley has previously been used with quasi-monoenergetic neutron (QMN) beams at the The Svedberg Laboratory (TSL) facility [4] measuring light-ion production on, e.g. C, O, Si, Fe, Pb at 96 MeV [1,5] and C, O, Si, Fe, Pb, Bi at 175 MeV [1,6]. In the energy-region above 14 MeV to a few tens of MeVs little data exists.…”

Section: Introductionmentioning

confidence: 99%

Designing an upgrade of the Medley setup for light-ion production and fission cross-section measurements

Jansson

Gustavsson

Al-Adili

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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Measurements of neutron-induced fission cross sections and light-ion production are planned in the energy range 1-40 MeV at the upcoming Neutrons For Science (NFS) facility. In order to prepare our detector setup for the neutron beam with continuous energy spectrum, a simulation software was written using the Geant4 toolkit for both measurement situations. The neutron energy range around 20 MeV is troublesome when it comes to the cross sections used by Geant4 since data-driven cross sections are only available below 20 MeV but not above, where they are based on semi-empirical models. Several customisations were made to the standard classes in Geant4 in order to produce consistent results over the whole simulated energy range.Expected uncertainties are reported for both types of measurements. The simulations have shown that a simultaneous precision measurement of the three standard cross sections H(n,n), 235 U(n,f) and 238 U(n,f) relative to each other is feasible using a triple layered target. As high resolution timing detectors for fission fragments we plan to use Parallel Plate Avalanche Counters (PPACs). The simulation results have put some restrictions on the design of these detectors as well as on the target design. This study suggests a fissile target no thicker than 2 µm (1.7 mg/cm 2 ) and a PPAC foil thickness preferably less than 1 µm. We also comment on the usability of Geant4 for simulation studies of neutron reactions in this energy range.

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A Medley with over ten years of (mostly) light-ion production measurements at The Svedberg Laboratory

Cited by 9 publications

References 7 publications

Experiments and Theoretical Data for Studying the Impact of Fission Yield Uncertainties on the Nuclear Fuel Cycle with TALYS/GEF and the Total Monte Carlo Method

Experiments and Theoretical Data for Studying the Impact of Fission Yield Uncertainties on the Nuclear Fuel Cycle with TALYS/GEF and the Total Monte Carlo Method

Measuring Light-ion Production and Fission Cross Sections Normalised to H(n,p) Scattering at the Upcoming NFS Facility

Designing an upgrade of the Medley setup for light-ion production and fission cross-section measurements

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