A5052282558- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Nuclear Materials and Properties
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Radiation Therapy and Dosimetry
- Astronomical and nuclear sciences
- Astro and Planetary Science
- Fusion materials and technologies
- Radioactivity and Radon Measurements
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Radioactive contamination and transfer
- Quantum Chromodynamics and Particle Interactions
- Advanced NMR Techniques and Applications
- Nuclear and radioactivity studies
- Magnetic confinement fusion research
- Graphite, nuclear technology, radiation studies
- X-ray Spectroscopy and Fluorescence Analysis
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
Universitat Politècnica de Catalunya
2015-2024
University of Edinburgh
2023
European Organization for Nuclear Research
2021
Fusion for Energy
2017
Universitat de València
2015
Instituto de Física Corpuscular
2015
University of Basel
2014
Goethe University Frankfurt
2013
The neutron time-of-flight facility n_TOF features a white source produced by spallation through 20GeV/c protons impinging on lead target. facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating CERN between 2001 and 2004, then underwent major upgrade in 2008. This paper presents detail all characteristics new beam currently available configurations, which correspond to two different collimation systems choices moderator. discussed include...
The $\beta$-delayed neutron emission probabilities of rich Hg and Tl nuclei have been measured together with $\beta$-decay half-lives for 20 isotopes Au, Hg, Tl, Pb Bi in the mass region N$\gtrsim$126. These are heaviest species where has observed so far. measurements provide key information to evaluate performance nuclear microscopic phenomenological models reproducing high-energy part strength distribution. In doing so, it provides important constraints global theoretical currently used...
The $^{63}$Ni($n, \gamma$) cross section has been measured for the first time at neutron time-of-flight facility n\_TOF CERN from thermal energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian Averaged Cross Sections calculated kT = 5 keV 100 with uncertainties around 20%. Stellar model calculations a 25 M$_\odot$ star show that new data have significant effect on $s$-process production $^{63}$Cu, $^{64}$Ni, and $^{64}$Zn in massive stars,...
The neutron sensitivity of the C$_6$D$_6$ detector setup used at n_TOF for capture measurements has been studied by means detailed GEANT4 simulations. A realistic software replica entire experimental hall, including beam line, sample, supports and walls area implemented in simulations have analyzed same manner as data, particular applying Pulse Height Weighting Technique. validated against a measurement background performed with $^\mathrm{nat}$C showing an excellent agreement above 1 keV. At...
The conceptual design of the BRIKEN neutron detector at radioactive ion beam factory (RIBF) RIKEN Nishina Center is reported. setup a complex system aimed detecting heavy-ion implants, β particles, γ rays and β-delayed neutrons. whole includes Advanced Implantation Detection Array (AIDA), two HPGe Clover detectors up to 166 3He-filled counters embedded in high-density polyethylene moderator. quite due large number different types 3He-tubes involved additional constraints introduced by...
This work reports on accurate, high-resolution measurements of the $^{25}$Mg($n, \gamma$)$^{26}$Mg and tot$) cross sections in neutron energy range from thermal to about 300 keV, leading a significantly improved parametrization. The relevant resonances for $n+^{25}$Mg were characterized combined R-matrix analysis experimental data. resulted an unambiguous spin/parity assignment corresponding excited states $^{26}$Mg. With this information upper limits reaction rates $^{22}$Ne($\alpha,...
The cross section of the $^{62}$Ni($n,\gamma$) reaction was measured with time-of-flight technique at neutron facility n_TOF CERN. Capture kernels 42 resonances were analyzed up to 200~keV energy and Maxwellian averaged sections (MACS) from $kT=5-100$ keV calculated. With a total uncertainty 4.5%, stellar is in excellent agreement KADoNiS compilation $kT=30$ keV, while being systematically lower factor 1.6 higher temperatures. $^{63}$Ni($n,\gamma$) for first time n_TOF. We determined...
The $^{58}$Ni $(n,\gamma)$ cross section has been measured at the neutron time of flight facility n_TOF CERN, in energy range from 27 meV up to 400 keV. In total, 51 resonances have analyzed 122 Maxwellian averaged sections (MACS) calculated for stellar temperatures kT$=$5-100 keV with uncertainties less than 6%, showing fair agreement recent experimental and evaluated data kT = 50 MACS extracted present work 30 is 34.2$\pm$0.6$_\mathrm{stat}\pm$1.8$_\mathrm{sys}$ mb, latest results...
A fission reaction chamber based on Parallel Plate Avalanche Counters (PPACs) was built for measuring angular distributions of fragments emitted in neutron-induced actinides at the neutron beam available Neutron Time-Of-Flight (n_TOF) facility CERN. The detectors and samples were tilted 45° with respect to direction cover all possible values emission angle fragments. main features this setup are discussed results fragment distribution provided 232Th(n,f) around threshold. compared data...
Background: There have been measurements on roughly 230 nuclei that are $\ensuremath{\beta}$-delayed neutron emitters. They range from $^{8}\mathrm{He}$ up to $^{150}\mathrm{La}$. Apart $^{210}\mathrm{Tl}$, with a branching ratio of only 0.007%, no other emitter has measured beyond $A=150$. Therefore, new data needed, particularly in the region heavy around $N=126$, order guide theoretical models and help understand formation third $r$-process peak at $A\ensuremath{\sim}195$.Purpose: To...
The 241Am(n,γ) cross section has been measured at the n_TOF facility CERN using deuterated benzene liquid scintillators, commonly known as C6D6 detectors, and time-of-flight spectrometry. results in resolved resonance range bring new constraints to evaluations below 150 eV, energy upper limit was extended from 320 eV with a total of 172 resonances not present current evaluations. thermal capture found be σth=678±68 b, which is good agreement most previous measurements. unresolved region...
An ambitious program to measure decay properties, primarily β-delayed neutron emission probabilities and half-lives, for a significant number of nuclei near or on the path rapid capture process, has been launched at RIKEN Nishina Center.We give here an overview status project.
The integral cross section of the ${}^{12}\mathrm{C}(n,p){}^{12}\mathrm{B}$ reaction has been determined for first time in neutron energy range from threshold to several GeV at n_TOF facility CERN. measurement relies on activation technique with $\ensuremath{\beta}$ decay ${}^{12}\mathrm{B}$ measured over a period four half-lives within same bunch which occurs. results indicate that model predictions, used variety applications, are mostly inadequate. value reported here can be as benchmark...
Neutron-induced fission cross sections of 238U and 235U are used as standards in the fast neutron region up to 200 MeV. A high accuracy is relevant experimentally determine other reaction sections. Therefore, detection effciency should be corrected by using angular distribution fragments (FFAD), which barely known above 20 In addition, produced highly excited deformed nuclei an important observable investigate nuclear process.
The aim of this work is to provide a precise and accurate measurement the $^{238}\mathrm{U}$($n,\ensuremath{\gamma}$) reaction cross section in energy region from 1 eV 700 keV. This fundamental importance for design calculations nuclear reactors, governing behavior reactor core. In particular, fast which are experiencing growing interest their ability burn radioactive waste, operate high neutron spectrum. most recent evaluations disagree due inconsistencies existing measurements up 15%....
The neutron-induced fission cross sections of $^{232}\mathrm{Th}$ and $^{233}\mathrm{U}$ were measured relative to $^{235}\mathrm{U}$ in a wide neutron energy range up 1 GeV (and from threshold the case $^{232}\mathrm{Th}$, 0.7 eV $^{233}\mathrm{U}$), using white-spectrum source at CERN Neutron Time-of-Flight (n_TOF) facility. Parallel plate avalanche counters (PPACs) used, installed Experimental Area (EAR1), which is located 185 m spallation target. anisotropic emission fragments taken into...