M. Krtička
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View article: Characterisation of the neutron beam in the n_TOF-EAR2 experimental area at CERN following the spallation target upgrade
Characterisation of the neutron beam in the n_TOF-EAR2 experimental area at CERN following the spallation target upgrade Open
The n_TOF facility at CERN has undergone a major upgrade after the installation of a new spallation target, designed to improve the performance of both neutron beamlines at the experimental areas 1 and 2 (EAR1 and EAR2) and the commissioni…
View article: On fluctuation properties of MACS
On fluctuation properties of MACS Open
The Maxwellian Average Cross Section (MACS) is usually calculated with help of the statistical codes that do not take into account fluctuations of individual resonance parameters. The actual MACS can substantially deviate from its expectat…
View article: Constraining calculations of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Pu</mml:mi><mml:mprescripts/><mml:none/><mml:mn>239</mml:mn></mml:mmultiscripts><mml:mo>(</mml:mo><mml:mi>n</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> cross sections with multistep cascade <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math>-ray spectra measured at the DANCE facility
Constraining calculations of cross sections with multistep cascade -ray spectra measured at the DANCE facility Open
Measurements of multistep cascade gamma-ray spectra from several low-lying 1+ resonances in the Pu239(n,γ) reaction were made using the DANCE detector. The measured spectra are compared to spectra simulated using several models for the pho…
View article: Recent highlights and prospects on (n,<i>γ</i>) measurements at the CERN n_TOF facility
Recent highlights and prospects on (n,<i>γ</i>) measurements at the CERN n_TOF facility Open
Neutron capture cross-section measurements are fundamental in the study of the slow neutron capture (s-) process of nucleosynthesis and for the development of innovative nuclear technologies. One of the best suited methods to measure radia…
View article: Measurement and analysis of the $$^{246}$$Cm and $$^{248}$$Cm neutron capture cross-sections at the EAR2 of the n_TOF facility at CERN
Measurement and analysis of the $$^{246}$$Cm and $$^{248}$$Cm neutron capture cross-sections at the EAR2 of the n_TOF facility at CERN Open
The $$^{246}$$ Cm(n, $$\gamma $$ ) and $$^{248}$$ Cm(n, $$\gamma $$ ) cross-sections have been measured at the Experimental Area 2 (EAR2) of the n_TOF facility at CERN with three C $$_6$$ D $$_6$$ detectors. This measuremen…
View article: Radiative neutron capture cross section of $^{242}$Pu measured at n_TOF-EAR1 in the unresolved resonance region up to 600 keV
Radiative neutron capture cross section of $^{242}$Pu measured at n_TOF-EAR1 in the unresolved resonance region up to 600 keV Open
The design of fast reactors burning MOX fuels requires accurate capture and fission cross sections. For the particular case of neutron capture on 242Pu, the NEA recommends that an accuracy of 8-12% should be achieved in the fast energy reg…
View article: Measurement and analysis of the $^{246}$Cm and $^{248}$Cm neutron capture cross-sections at the EAR2 of the n TOF facility
Measurement and analysis of the $^{246}$Cm and $^{248}$Cm neutron capture cross-sections at the EAR2 of the n TOF facility Open
The $^{246}$Cm(n,$\gamma$) and $^{248}$Cm(n,$\gamma$) cross-sections have been measured at the Experimental Area 2 (EAR2) of the n_TOF facility at CERN with three C$_6$D$_6$ detectors. This measurement is part of a collective effort to imp…
View article: Measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ce</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>140</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo stretchy="false">(</mml:mo><mml:mi mathvariant="normal">n</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe
Measurement of the Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe Open
Ce140(n,γ) is a key reaction for slow neutron-capture (s-process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty ≈5%) at the n_TOF facility, with an unpreced…
View article: Measurement of the prompt fission $$\gamma $$-rays from slow neutron-induced fission of $$^{235}$$U with STEFF
Measurement of the prompt fission $$\gamma $$-rays from slow neutron-induced fission of $$^{235}$$U with STEFF Open
The average energy and multiplicity of prompt $$\gamma $$ -rays from slow neutron-induced fission of $$^{235}$$ U have been measured using the STEFF spectrometer at the neutron time-of-flight facility n_TOF. The individual responses f…
View article: Gamma-Ray Emission Spectra as a Constraint on Calculations of <sup>234,236,238</sup>U Neutron-Capture Cross Sections
Gamma-Ray Emission Spectra as a Constraint on Calculations of <sup>234,236,238</sup>U Neutron-Capture Cross Sections Open
Neutron capture cross sections in the “continuum” region (>≈1 keV) and gamma-emission spectra are of importance to basic science and many applied fields. Careful measurements have been made on most common stable nuclides, but physicists mu…
View article: The n_TOF facility at CERN
The n_TOF facility at CERN Open
The neutron Time-of-Flight facility (n_TOF) is an innovative facility operative since 2001 at CERN, with three experimental areas. In this paper the n_TOF facility will be described, together with the upgrade of the facility during the Lon…
View article: Description and outlook of the <sup>50,53</sup>Cr(n,γ) cross section measurement at n_TOF and HiSPANoS
Description and outlook of the <sup>50,53</sup>Cr(n,γ) cross section measurement at n_TOF and HiSPANoS Open
Chromium is a very relevant element regarding criticality safety in nuclear reactors because of its presence in stainless steel, an important structural material. Currently, there are serious discrepancies between the different evaluations…
View article: Experimental setup of the <sup>239</sup>Pu neutron capture and fission cross-section measurements at n_TOF, CERN
Experimental setup of the <sup>239</sup>Pu neutron capture and fission cross-section measurements at n_TOF, CERN Open
The experimental setup of the new measurement of 239 Pu fission and capture cross-section in the n_TOF time-of-flight facility at CERN is presented. The measurement aims to address the needs and demands of nuclear data users. The experimen…
View article: Pushing the high count rate limits of scintillation detectors for challenging neutron-capture experiments
Pushing the high count rate limits of scintillation detectors for challenging neutron-capture experiments Open
One of the critical aspects for the accurate determination of neutron capture cross sections when combining time-of-flight and total energy detector techniques is the characterization and control of systematic uncertainties associated to t…
View article: The neutron time-of-flight facility n_TOF at CERN Recent facility upgrades and detector developments
The neutron time-of-flight facility n_TOF at CERN Recent facility upgrades and detector developments Open
Based on an idea by Carlo Rubbia, the n_TOF facility at CERN has been operating for over 20 years. It is a neutron spallation source, driven by the 20 GeV/c proton beam from the CERN PS accelerator. Neutrons in a very wide energy range (fr…
View article: Measurement of total and partial cross sections of the $$^{90}$$Zr(p,$$\gamma $$)$$^{91}$$Nb reaction with in-beam $$\gamma $$-ray spectroscopy
Measurement of total and partial cross sections of the $$^{90}$$Zr(p,$$\gamma $$)$$^{91}$$Nb reaction with in-beam $$\gamma $$-ray spectroscopy Open
The origin of many p-nuclei remains an unsolved problem in nuclear astrophysics. While photo-dissociation reactions in the $$\gamma $$ -process can explain the production of many p-nuclei, some, notably $$^{92,94}$$ Mo and $$^{96,9…
View article: Neutron capture cross section of $$^{83}$$Kr
Neutron capture cross section of $$^{83}$$Kr Open
The neutron capture cross section of $$^{83}$$ Kr has been measured via the time-of-flight technique between 25 meV and 500 keV. The experiment used the DANCE array at the Los Alamos National Laboratory. Maxwellian Averaged Cross Sectio…
View article: Measurement of the <sup>241</sup>Am(n,γ) cross section at the n_TOF facility at CERN
Measurement of the <sup>241</sup>Am(n,γ) cross section at the n_TOF facility at CERN Open
The neutron capture cross section of 241 Am is an important quantity for nuclear energy production and fuel cycle scenarios. Several measurements have been performed in recent years with the aim to reduce existing uncertainties in evaluate…
View article: New detection systems for an enhanced sensitivity in key stellar (n,γ) measurements
New detection systems for an enhanced sensitivity in key stellar (n,γ) measurements Open
Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant and massive stars. However, neutron capture measure…
View article: The n_TOF NEAR Station Commissioning and first physics case
The n_TOF NEAR Station Commissioning and first physics case Open
The NEAR Station is a new experimental area developed at the n_TOF Facility at CERN. The activation station of NEAR underwent a characterization of the beam following the installation of the new n_TOF Spallation Target. The commissioning o…