Conveners
Parallel Session 2: Nuclear data for applied and scientific purposes/Neutron detection & Methodical aspects: (1)
- Changlin Lan (Lanzhou University)
Parallel Session 2: Nuclear data for applied and scientific purposes/Neutron detection & Methodical aspects: (2)
- Wei Jiang (高能所)
Parallel Session 2: Nuclear data for applied and scientific purposes/Neutron detection & Methodical aspects: (3)
- Pavel Prusachenko (FLNP JINR)
Parallel Session 2: Nuclear data for applied and scientific purposes/Neutron detection & Methodical aspects: (4)
- Jifeng Han (四川大学)
The cross section of 6Li(n, t)4He reaction is adopted as standards up to 1 MeV due to its relatively high cross-section. However, in the neutron energy above 0.5 MeV, it was indicated that the cross section might be overestimated by evaluated data, such as ENDF/B-VIII.0 and JEFF-3.3 [1]. Besides, due to the high Q value (4.78 MeV), the 6Li(n, t)4He reaction is widely used in neutron detection...
The characteristics of various nuclear processes are rather simple to calculate in statistical model [1,2]. In particular, the transition-width distribution is described by the Porter–Thomas equation, there are no correlations between different partial widths, the strength function of $\beta$-transitions $S_\beta (E)$ depends smoothly on energy, and the ratios of the amplitudes for decay via...
The Back-n white neutron beam line, which uses back-streaming white neutrons from the spallation target of the China Spallation Neutron Source, is used for nuclear data measurements. A Micromegas-based neutron detector with two variants was specially developed to measure the beam spot distribution for this beam line. In this article, the design, fabrication, and characterization of the...
The neutron capture cross section data for $^{165}$Ho were measured at the Back-streaming White neutron beam line (Back-n) of China Spallation Neutron Source (CSNS) using total energy detection systems, which is comprise a set four C$_6$D$_6$ scintillator detectors coupled with pulse height weighting techniques.
The resonance parameters were extracted using the multilevel, multichannel...
Since the foundation of Back-n beam line in CSNS, the capture cross section of $^{197}Au(n,\gamma)$ had been measured twice. Considering the lower energy zone and high level of background of previous results, however, we aim to process the yield result to 1 MeV, and analyze the resonance parameters: resonance peak, Gamma width and incident neutron width from 1 eV to 2 keV that belongs to the...
Efficient and practical neutron detectors are crucial in many areas, including national security, medicine, crystallography, and astronomy. As commonly used neutron detectors, 3He-gas-filled proportional counters still play an irreplaceable role in neutron fluence monitoring. 3He tubes are used directly to detect the thermal neutron, but the measurable neutron energy range is often extended by...
Model of experiments for applied research at the Nica facility are developed and manufactured. Model includes two ionization chambers IK-1, IK-2, strip and phosphor chambers for measure profile with coordinate and intensity of beam and various sample holders with different geometry. At those chambers, the materials of electrodes are used different, at the IK-1 it is foil-clad fiberglass, for...
Cosmic muon-induced fast neutrons are one of the main sources of neutron background in deep underground environments. Due to the high energy and low flux of cosmic muons, it is challenging to directly measure the neutron yield. According to the Weizsäcker-Williams virtual photon method, when the energy transfer is less than one-tenth of the kinetic energy of the lepton, the Coulomb excitation...
Neutron-induced reaction 6Li(n,t)4He plays an important role in nuclear energy and nuclear data evaluation. The cross section of 6Li(n,t)4He has been adopted as standard in the energy range of 0.0253eV–1.0MeV [1], and is commonly used as reference for other cross section measurements. Previous works have shown non-negligible discrepancies in cross section results [2,3,4], and the angular...
The TANGRA project is aimed at studying the inelastic scattering of 14.1 MeV neutrons from the ING-27 neutron generator on various atomic nuclei using the tagged neutron method. To register gamma rays from the interaction of neutrons with nuclei, we use HPGe and LaBr3(Ce) detectors. To perform high-precision measurements, the energy calibration and counting efficiency of the detectors were...
The 1H(n, n)1H reaction is important for fundamental physics research, neutron cross-section standards, and nuclear data evaluation. However, there are few differential cross-section data for this reaction in several MeV neutron energy regions. The relative differential cross sections of the 1H(n, n)1H reaction was measured at the Back-n white neutron source of the China Spallation Neutron...
Gamma and neutron imaging are crucial non-destructive testing techniques which have been widely used in nuclear safety, national security, materials characterization, and cultural heritage preservation. While the hit position reconstruction algorithms are key issues to improve the image fidelity and accuracy. A 2D planar neutron and gamma imaging system based on a monolithic lithium glass...
In the scope of the “TANGRA” (TAgged Neutrons and Gamma RAys) project established at the Frank Laboratory of Neutron Physics (JINR, Dubna), several experimental setups of different configurations [1] were devised and employed to study the inelastic scattering of neutrons with an energy of 14 MeV on atomic nuclei using the tagged neutron method [2].
One of “TANGRA” setups utilizes two...
Gamma spectra processing is one of the most time-consuming stages of instrumental neutron activation analysis. Since spectra contain a large number of multiplets, their processing by classical mathematical methods leads to high uncertainty in the areas of full energy peaks. In this case, it is necessary to perform manual fitting of peak boundaries. This process is planned to be automated using...
Fast-timing measurement of nuclear excited states using Labr3 detectors has gained a lot of attention in experimental nuclear physics. This is because that the lifetime information is more sensitive to the intrinsic nuclear structure than the level energy. In this talk the speaker will briefly introduce the idea of constructing a fast-timing detector array by LaBr3 detector coupled with...
A compact time-of-flight neutron spectrometer was developed as a part of the BM@N setup at the Nuclotron accelerator (JINR). The aim of the spectrometer is study of neutron emission from target spectator decay in heavy-ion collisions at 2 – 4 A GeV. The neutron spectra are measured at large angles in the energy range of 2 – 200 MeV using small flight path of 20 – 30 cm. Neutron detectors are...
Beryllium, zirconium, and bismuth play crucial roles in nuclear science and technology: beryllium serves as a neutron reflector and moderator, zirconium is widely used in reactor structural materials, and bismuth is essential in accelerator-driven systems and lead-bismuth-cooled reactors. Accurate nuclear data for these materials are critical for shielding, reactor design, and nuclear safety...
The main goal of the TANGRA (TAgged Neutrons and Gamma RAys) project at the Frank Laboratory of Neutron Physics (JINR, Dubna) is to study the interaction of 14.1 MeV neutrons with various nuclei. One of the experimental setups developed within the project consists of an array of 20 EJ-200 plastic scintillators and is designed to study the angular distributions of neutrons and γ-rays resulting...
Current microscopic nuclear data face two major challenges: significant discrepancies among datasets from different sources and missing data points at specific energy levels. To maximize the utilization of existing data, this study proposes constraining differential experimental results through integral experiments, thereby enhancing data consistency and completeness.
Our investigation...
The relative deviation of the thermal capture cross-section of 242Pu in the mainstream nuclear database is more than 10%, and the uncertainty of its capture cross-section in the intermediate and fast neutron region is over 30%. In this paper, the thermal capture cross-section measurement of 242Pu was carried out based on activation method. The irradiation experiment was carried out on the...
In accelerator-driven subcritical nuclear system (ADS) simulations, spallation and transmutation reaction models are typically employed due to the lack of the database in medium-to-high energy range. However, some model deviations have been identified, particularly in high-energy neutron-induced reactions on actinide nuclides. This paper presents a comprehensive verification of the current...
