Characterization of a Be(p,xn) Neutron Source for Fission Yields Measurements

Mattera, A.; Lantz, Mattias; Pomp, Stephan; Rakopoulos, Vasileios; Solders, Andreas; Andersson, P.; Hjalmarsson, Anders; Valldor-Blücher, J.; Prokofiev, Alexander V.; Passoth, E.; Gorelov, D.; Penttilä, H.; Rinta‐Antila, S.; Bedogni, R.; Gentile, A.; Bortot, D.; Esposito, A.; Introini, M.V.; Pola, A.

doi:10.1016/j.nds.2014.08.117

Cited by 9 publications

(13 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A characterisation measurement of the neutron flux from a prototype of the Be converter was performed at the TSL facility in Uppsala by means of two different measurement techniques, time- of-flight measurement (ToF) and Bonner sphere spectroscopy [19][20][21][22]. In 2014 the first tests with a prototype at IGISOL were performed.…”

Section: Neutron Induced Fission Yieldsmentioning

confidence: 99%

Fission yield measurements at IGISOL

Lantz

Al-Adili

Gorelov

et al. 2016

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

Abstract. The fission product yields are an important characteristic of the fission process. In fundamental physics, knowledge of the yield distributions is needed to better understand the fission process. For nuclear energy applications good knowledge of neutroninduced fission-product yields is important for the safe and efficient operation of nuclear power plants. With the Ion Guide Isotope Separator On-Line (IGISOL) technique, products of nuclear reactions are stopped in a buffer gas and then extracted and separated by mass. Thanks to the high resolving power of the JYFLTRAP Penning trap, at University of Jyväskylä, fission products can be isobarically separated, making it possible to measure relative independent fission yields. In some cases it is even possible to resolve isomeric states from the ground state, permitting measurements of isomeric yield ratios. So far the reactions U(p,f) and Th(p,f) have been studied using the IGISOL-JYFLTRAP facility. Recently, a neutron converter target has been developed utilizing the Be(p,xn) reaction. We here present the IGISOL-technique for fission yield measurements and some of the results from the measurements on proton induced fission. We also present the development of the neutron converter target, the characterization of the neutron field and the first tests with neutron-induced fission.

show abstract

Section: Neutron Induced Fission Yieldsmentioning

confidence: 99%

Fission yield measurements at IGISOL

Lantz

Al-Adili

Gorelov

et al. 2016

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

show abstract

“…At the same time it reduces the requirements for heat removal, since a part of the proton energy is deposited in the cooling water. Production of neutrons in the water is not expected to give a considerable contribution to the total flux; on the other hand, activation in the water will be induced both by the protons directly and by the neutrons produced in the beryllium converter [14].…”

Section: Heat Dissipationmentioning

confidence: 99%

“…Pulses corresponding to neutrons were selected based on both a PSD parameter and the pulse height, the procedure is described in more detail in ref. [14].…”

Section: Tof With a Liquid Scintillatormentioning

confidence: 99%

See 1 more Smart Citation

A neutron source for IGISOL-JYFLTRAP: Design and characterisation

et al. 2017

Self Cite

View full text Add to dashboard Cite

Abstract.A white neutron source based on the Be(p, nx) reaction for fission studies at the IGISOL-JYFLTRAP facility has been designed and tested. 30 MeV protons impinge on a 5 mm thick water-cooled beryllium disc. The source was designed to produce at least 10 12 fast neutrons/s on a secondary fission target, in order to reach competitive production rates of fission products far from the valley of stability. The Monte Carlo codes MCNPX and FLUKA were used in the design phase to simulate the neutron energy spectra. Two experiments to characterise the neutron field were performed: the first was carried out at The Svedberg Laboratory in Uppsala (SE), using an Extended-Range Bonner Sphere Spectrometer and a liquid scintillator which used the time-of-flight (TOF) method to determine the energy of the neutrons; the second employed Thin-Film Breakdown Counters for the measurement of the TOF, and activation foils, at the IGISOL facility in Jyväskylä (FI). Design considerations and the results of the two characterisation measurements are presented, providing benchmarks for the simulations.

show abstract

“…Neutron induced fission also produces more neutron rich products, of interest in the studies of nuclides far from the line of stability. To facilitate this reaction at IGISOL a Be(p,xn) neutron converter and a dedicated ion guide for neutron induced fission has been developed [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Simulations of the stopping efficiencies of fission ion guides

et al. 2017

View full text Add to dashboard Cite

Abstract. With the Ion Guide Isotope Separator On-Line (IGISOL) facility, located at the University of Jyväskylä, products of nuclear reactions are separated by mass. The high resolving power of the JYFLTRAP Penning trap, with full separation of individual nuclides, capacitates the study of nuclides far from the line of stability. For the production of neutron-rich medium-heavy nuclides, fissioning of actinides is a feasible reaction. This can be achieved with protons from an in-house accelerator or, alternatively, with neutrons through the addition of a newly developed Be(p,xn)-converter. The hereby-obtained fission products are used in nuclear data measurements, for example fission yields, nuclear masses, Q-values and decay spectroscopy.Prior to separation, the ionized reaction products are stopped in a helium-filled gas cell, referred to as the ion-guide. In this work we present simulations of the stopping of fission products in an ion guide developed for neutron-induced fission. The production and extraction rates are evaluated and compared against experimental values.

show abstract

Characterization of a Be(p,xn) Neutron Source for Fission Yields Measurements

Cited by 9 publications

References 4 publications

Fission yield measurements at IGISOL

Fission yield measurements at IGISOL

A neutron source for IGISOL-JYFLTRAP: Design and characterisation

Simulations of the stopping efficiencies of fission ion guides

Contact Info

Product

Resources

About