Comparison of digital and analogue data acquisition systems for nuclear spectroscopy

Al-Adili, Ali; Hambsch, F.‐J.; Oberstedt, S.; Pomp, Stephan; Zeynalov, Shakir

doi:10.1016/j.nima.2010.09.126

Cited by 31 publications

(19 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The induced signals on each electrode were recorded by a 100 MHz digitiser. In theory one can calculate the third knowing two of the signals, but in practise it is better to record all of them in order to reduce uncertainties due to electronic drift [11]. The purpose of the grids is to shield the anodes and in this experiment they consist of conductive meshes (rather than parallel wires, which is another option).…”

Section: Gridded Ionisation Chambermentioning

confidence: 99%

Measurement of the⁶Li(n,α) neutron standard cross-section at the GELINA facility

Jansson

Al-Adili

Bevilacqua

et al. 2016

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The 6 Li(n,α) reaction cross-section is commonly used as a reference cross section. However, it is only considered a neutron standard up to 1 MeV. For higher energies, there are discrepancies of several per cents between recent measurements and evaluated data files. In order to extend and establish 6 Li(n,α) as a neutron standard above 1 MeV these discrepancies must be resolved. Our measurement at the GELINA facility at JRC-IRMM in Geel, Belgium is ongoing. We are using a double twin Frisch-grid setup to detect both α-particles from two 6 Li targets and fission products from two 235 U reference targets. Our targets have thick backings but are employed in pairs, one forward facing and one backward facing. In this way we still cover, in principle, a solid angle of 4π. We present some preliminary results showing that the existing cross-section data is well reproduced around the resonance at 240 keV. The final data taking will start in the beginning of 2016, when the GELINA facility goes online again after a few months of shut down.

show abstract

Section: Gridded Ionisation Chambermentioning

confidence: 99%

Measurement of the⁶Li(n,α) neutron standard cross-section at the GELINA facility

Jansson

Al-Adili

Bevilacqua

et al. 2016

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…[10], to obtain the FF energies and angles. The data are corrected for grid inefficiency [11,12] and baseline fluctuations.…”

Section: Analysis Of Fission Fragment (Ff) Datamentioning

confidence: 99%

Neutron-multiplicity experiments for enhanced fission modelling

et al. 2017

View full text Add to dashboard Cite

Abstract. The nuclear de-excitation process of fission fragments (FF) provides fundamental information for the understanding of nuclear fission and nuclear structure in neutron-rich isotopes. The variation of the prompt-neutron multiplicity, ν(A), as a function of the incident neutron energy (E n ) is one of many open questions. It leads to significantly different treatments in various fission models and implies that experimental data are analyzed based on contradicting assumptions. One critical question is whether the additional excitation energy (E exc ) is manifested through an increase of ν(A) for all fragments or for the heavy ones only. A systematic investigation of ν(A) as a function of E n has been initiated. Correlations between prompt-fission neutrons and fission fragments are obtained by using liquid scintillators in conjunction with a Frisch-grid ionization chamber. The proof-of-principle has been achieved on the reaction 235 U(n th ,f) at the Van De Graff (VdG) accelerator of the JRC-Geel using a fully digital data acquisition system. Neutrons from 252 Cf(sf) were measured separately to quantify the neutron-scattering component due to surrounding shielding material and to determine the intrinsic detector efficiency. Prelimenary results on ν(A) and spectrum in correlation with FF properties are presented.

show abstract

“…For instance in the case of non-fissile (fertile) actinides nearly complete emission yield data were measured for 234,238 U(n,f) [1][2][3] in the En range where only the first fission chance is involved. A surprising discovery was that the characteristics of fission fragments (FF) show remarkable variation in the En range close to vibrational resonances in the sub-barrier fission cross-section.…”

Section: Properties Of Fission Fragments and Prompt Neutrons At Subthmentioning

confidence: 99%

Sub-barrier resonance fission and its effects on fission fragment properties, exemplified on^234,238U(n,f)

Tudora

Hambsch

Oberstedt

2013

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

Abstract. The correlation between the sub-barrier resonant behaviour of fission crosssection of non-fissile actinides (pre-scission stage) and the visible fluctuations of their fission fragment and prompt neutron data (post-scission stage) around the incident energies of sub-barrier resonances is outlined and supported by quantitative results for two fissioning systems 234,238 U(n,f). These quantitative results refer to both stages of the fission process: a) The pre-scission stage including the calculation of neutron induced cross-sections with focus on fission. Calculations are done in the frame of the refined statistical model for fission with sub-barrier effects also extended to take into account the multi-modal fission. b) The post-scission stage including the prompt neutron emission treated in the frame of the Point-by-Point model. Total quantities characterizing the fission fragments and the prompt neutrons obtained by averaging the Point-by-Point results as a function of fragment over the fission fragment distributions reveal variations around the energies of sub-barrier resonances in the fission crosssection.

show abstract

Comparison of digital and analogue data acquisition systems for nuclear spectroscopy

Cited by 31 publications

References 11 publications

Measurement of the⁶Li(n,α) neutron standard cross-section at the GELINA facility

Measurement of the⁶Li(n,α) neutron standard cross-section at the GELINA facility

Neutron-multiplicity experiments for enhanced fission modelling

Sub-barrier resonance fission and its effects on fission fragment properties, exemplified on^234,238U(n,f)

Contact Info

Product

Resources

About

Comparison of digital and analogue data acquisition systems for nuclear spectroscopy

Cited by 31 publications

References 11 publications

Measurement of the6Li(n,α) neutron standard cross-section at the GELINA facility

Measurement of the6Li(n,α) neutron standard cross-section at the GELINA facility

Neutron-multiplicity experiments for enhanced fission modelling

Sub-barrier resonance fission and its effects on fission fragment properties, exemplified on234,238U(n,f)

Contact Info

Product

Resources

About

Measurement of the⁶Li(n,α) neutron standard cross-section at the GELINA facility

Measurement of the⁶Li(n,α) neutron standard cross-section at the GELINA facility

Sub-barrier resonance fission and its effects on fission fragment properties, exemplified on^234,238U(n,f)