134 research outputs found
Uncertainties of calculated coincidence-summing correction factors in gamma-ray spectrometry
Uncertainty propagation to the - coincidence-summing
correction factor from the covariances of the nuclear data and detection
efficiencies have been formulated. The method was applied in the uncertainty
analysis of the coincidence-summing correction factors in the -ray
spectrometry of the Cs point source using a p-type coaxial HPGe
detector.Comment: 4 pages, 2 figures, to be published in the proceedings of the "2019
International Conference on Nuclear Data for Science and Technology" (ND2019
Systematics of elliptic flow in heavy-ion collisions
We analyze elliptic flow from SIS to RHIC energies systematically in a realistic dynamical cascade model. We compare our results with the recent data from STAR and PHOBOS collaborations on elliptic flow of charged particles at midrapidity in Au+ Au collisions at RHIC. In the analysis of elliptic flow at RHIC energy, we find a good fitting with data at 1.5 times a scaling factor to our model, which characterizes that the model is required to have extra pressure generated from the subsequent parton scattering after the initial minijet production. In energy dependence of elliptic flow, we notice re-hardening nature at RHIC energies. Both these two observations would probably imply the possible formation of quark-gluon plasma
Compilation of isomeric ratios of light particle induced nuclear reactions
Experimental isomeric ratios of light (A4) particle-induced nuclear
reactions were compiled for the product nuclides having metastable states with
half-lives longer than 0.1 sec. The experimental isomeric ratio data were taken
from the EXFOR library and reviewed. When an experiment reports isomer
production cross sections instead of isomeric ratios, the cross sections taken
from the EXFOR library were converted to the isomeric ratios by us. During
compilation, questionable data (e.g.,preliminary data compiled in EXFOR in
parallel with their final data, sum of isomer production cross sections larger
than the total production cross sections) were excluded. As an application of
the new compilation, goodness-of-fit was studied for the isomeric ratios
predicted by the reaction model code TALYS-1.96
Re-Hardening of Hadron Transverse Mass Spectra in Relativistic Heavy-Ion Collisions
We analyze the spectra of pions and protons in heavy-ion collisions at
relativistic energies from 2 A GeV to 65+65 A GeV by using a jet-implemented
hadron-string cascade model. In this energy region, hadron transverse mass
spectra first show softening until SPS energies, and re-hardening may emerge at
RHIC energies. Since hadronic matter is expected to show only softening at
higher energy densities, this re-hardening of spectra can be interpreted as a
good signature of the quark-gluon plasma formation.Comment: 10 pages, 3 figures, 1 table, Poster presentation at QM2001, Revised
to correct latex error in citation on April 6, 200
Results of time-of-flight transmission measurements for 197Au at a 50 m station of GELINA
Transmission measurements have been performed at the time-of-flight facility GELINA to determine the total cross section for neutron induced reactions in 197Au. The measurements have been carried out at a 50 m transmission station of GELINA with the accelerator operating at 800 Hz. This report provides the experimental details required to deliver the data to the EXFOR data library which is maintained by the Nuclear Data Section of the IAEA and the Nuclear Energy Agency of the OECD. The experimental conditions and data reduction procedures are described. In addition, the full covariance information based on the AGS concept is given such that nuclear reaction model parameters together with their covariances can be derived in a least squares adjustment to the data.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard
Experimental uncertainty and covariance information in EXFOR library
Compilation of experimental uncertainty and covariance information in the EXFOR Library is discussed. Following the presentation of a brief history of information provided in the EXFOR Library, the current EXFOR Formats and their limitations are reviewed. Proposed extensions for neutron-induced reaction cross sections in the fast neutron region and resonance region are also presented.JRC.D.4-Standards for Nuclear Safety, Security and Safeguard
Excitation functions of deuteron-induced nuclear reactions on erbium in the energy range of 4–24 MeV
Excitation functions for the natEr(d,x)163,165,166,167,168,170Tm and natEr(d,x)171Er nuclear reactions were measured from the respective thresholds up to 24 MeV by using a stacked-foil activation technique combined with HPGe γ-ray spectrometry. Measured data show a partial agreement when compared with the available literature data, theoretical data extracted from the TENDL-2019 library, and predicted data by the model code EMPIRE-3.2.2. Estimated physical thick target yields of the reaction products show close values to the directly measured ones available in the literature. The deduced yield curves indicate that a typical irradiation (Ed = 15 MeV, Id = 100 µA, tirr = 72 h) of enriched 167Er target by a low energy deuteron cyclotron is suitable to obtain more than a hundred GBq activity of 167Tm with negligible impurity from 168Tm. Measured data of 170Er(d,p)171Er reaction have great significance to improve the predicting capability of the model code
Production cross sections of thulium radioisotopes for alpha-particle induced reactions on holmium
The production cross sections of 165–168Tm radioisotopes produced in α-particle induced reactions on 165Ho were
measured from 49.6 MeV down to the respective thresholds using the stacked-foil activation technique and HPGe
gamma-ray spectrometry. The measured excitation functions were compared with previous measurements as
well as the TENDL-2019 library. We also calculated the thick target yields for all the assessed radioisotopes by
integration of the measured excitation functions and found that they show good agreement with the directly
measured thick target yields except for 168Tm production
Study of relativistic nuclear collisions at AGS energies from p+Be to Au+Au with hadronic cascade model
A hadronic cascade model based on resonances and strings is used to study
mass dependence of relativistic nuclear collisions from p+Be to Au+Au at AGS
energies (\sim 10\AGeV) systematically. Hadron transverse momentum and
rapidity distributions obtained with both cascade calculations and Glauber type
calculations are compared with experimental data to perform detailed discussion
about the importance of rescattering among hadrons. We find good agreement with
the experimental data without any change of model parameters with the cascade
model. It is found that rescattering is of importance both for the explanation
of high transverse momentum tail and for the multiplicity of produced
particles.Comment: 27 pages, 30 figure
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