Measurement of light-ion production at the new Uppsala neutron beam facility

Double-differential cross sections for light-ion (p, d, t, 3He and alpha) production in carbon induced by 96 MeV neutrons have been measured at eight laboratory angles from 20 degrees to 160 degrees in steps of 20 degrees. Experimental techniques are presented as well as procedures for data taking and data reduction. Deduced energy-differential, angle-differential and production cross sections are reported. Experimental cross sections are compared with theoretical reaction model calculations and experimental data in the literature. The measured particle data show marked discrepancies from the results of the model calculations in spectral shape and magnitude. The measured production cross sections for protons, deuterons, tritons, 3He, and alpha particles support the trends suggested by data at lower energies.Comment: 40 pages, 18 figures, 3 table

show abstract

“…Thus far, we have collected data on 12 C(n, lcp) and presented preliminary double-differential cross sections at the ND2007 conference [57].…”

Section: Discussionmentioning

confidence: 99%

“…Using MEDLEY at the new Uppsala neutron beam facility [56], we plan to measure double-differential cross sections for light-ion production on oxygen, silicon, iron, lead, bismuth and uranium at 175 MeV. Thus far, we have collected data on 12 C(n,lcp) and presented preliminary double-differential cross sections at the ND2007 conference [57].…”

Section: Discussionmentioning

confidence: 99%

Light-ion production in the interaction of 96 MeV neutrons with carbon

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…Preliminary double-differential cross sections for carbon are presented in another contribution to this conference by M. Hayashi et al [16].…”

Section: Data-taking and Analysismentioning

confidence: 99%

“…The crystals, toghether with the PDs, are mounted inside an aluminum tube and have been manufactured by Saint-Gobain, France. The CsI response function has been tested with 170 MeV proton beam and compared with Monte Carlo simulations, which is decribed elsewhere at this conference [16].…”

Section: The Medley Facilitymentioning

confidence: 99%

Studies of neutron-induced light-ion production with the MEDLEY facility

Tippawan

Pomp

Andersson

et al. 2007

Nd2007

Self Cite

View full text Add to dashboard Cite

Abstract. The growing interest in applications involving high-energy neutrons (E > 20 MeV) demands high-quality experimental data on neutron-induced reactions. Such data have been measured with the MEDLEY setup at the The Svedberg Laboratory (TSL), Uppsala, Sweden. It has been used to measure differential cross sections for elastic nd scattering and double-differential cross sections for light-ion production (A ≤ 4) with targets ranging from C to U and at incident neutron energies around 96 MeV. We summarize the experimental results obtained so far and compared with theoretical reaction model calculations. A new method for correcting charged-particle spectra for thick target effects has been used for data obtained with the MEDLEY facility. The new quasi-monoenergetic neutron beam facility of TSL offers the possibility to extend these measurements up to neutron energies of 175 MeV. In January 2007, the neutron beam facility at TSL has been equipped with improved shielding and pre-collimator to reduce the background observed with MEDLEY during the first experimental campaigns at 175 MeV to an acceptable level. We present the current status of the MEDLEY facility after the shielding upgrade. We summarize also our ongoing projects including both measurements of light-ion production at 175 MeV from C to U targets and fission studies of U-238 in the energy region of 11 to 175 MeV.

show abstract

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:

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Measurement of light-ion production at the new Uppsala neutron beam facility

Cited by 3 publications

References 8 publications

Light-ion production in the interaction of 96 MeV neutrons with carbon

Light-ion production in the interaction of 96 MeV neutrons with carbon

Studies of neutron-induced light-ion production with the MEDLEY facility

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

Contact Info

Product

Resources

About