scholarly journals Cross section measurements of the 7 8Se(p,7)7 9Br and 8 0Se(p,7)8 1Br reactions

2019 ◽  
Vol 11 ◽  
Author(s):  
G. Kriembardis ◽  
S. Galanopoulos ◽  
P. Demetriou ◽  
S. Harissopulos ◽  
M. Fey ◽  
...  
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Cross Sections ◽  
Preliminary Analysis ◽  
High Efficiency ◽  
Background Suppression ◽  
Total Cross Sections ◽  
Hpge Detectors ◽  
Theoretical Predictions ◽  
Compton Background

In beam cross section measurements of the 78Se(p,7)79Br and 80Se(p,7)81Br reactions have been carried out at Ep=1.4-3.5 MeV, by using high efficiency HPGe detectors with BGO shields for Compton background suppression. A preliminary analysis yielded total cross sections ranging from 10 μb to 3 mb. By means of the statistical compound nucleus theory of Hauser-Feshbach cross sections have also been calculated. A comparison between experimental data and theoretical predictions is presented.

scholarly journals Cross sections of proton capture reactions of Sr isotopes

2019 ◽  
Vol 11 ◽  
Author(s):  
S. Galanopoulos ◽  
P. Demetriou ◽  
M. Kokkoris ◽  
G. Kriembardis ◽  
S. Harissopulos ◽  
...  
Keyword(s):  
Cross Sections ◽  
Relative Efficiency ◽  
Background Suppression ◽  
Proton Capture ◽  
Total Cross Sections ◽  
Model Code ◽  
Hpge Detectors ◽  
Theoretical Predictions ◽  
Compton Background ◽  
Good Agreement

Cross section measurements of the proton capture reactions of the 86Sr, 87Sr and 88Sr isotopes were carried out at energies Ep=1.4-5 MeV. At Ep <3.5 MeV an array of 4 HPGe detectors with 100% relative efficiency shielded with BGO scintillators for Compton background suppression was used, whereas at Ep >3.5 MeV, the measurements were performed by means of one HPGe detector of 80% relative efficiency. For the 87Sr(p,7)88Y and 88Sr(p,7)89Y reactions total cross sections ranging from 0.5 μο-5 mb were found. The data analysis of the 86Sr(p,7)87Y reaction is in progress. Cross sections have also been calculated by means of the statistical model code MOST. A very good agreement between the experimental data and the theoretical predictions has been found.

scholarly journals Measurement of nuclide production cross section for lead and bismuth with proton in energy range from 0.4 GeV to 3.0 GeV

2020 ◽  
Vol 239 ◽  
pp. 06004
Author(s):  
Hiroki Matsuda ◽  
Shin-ichiro Meigo ◽  
Hiroki Iwamoto ◽  
Fujio Maekawa
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Cross Sections ◽  
Production Cross Section ◽  
Production Cross ◽  
High Energy ◽  
Production Yield ◽  
Thin Foils ◽  
Hpge Detectors ◽  
Decay Gamma

For the Accelerator-Driven nuclear transmutation System (ADS), nuclide production yield estimation in a lead-bismuth target is important to manage the target. However, experimental data of nuclide production yield by spallation and high-energy fission reactions are scarce. In order to obtain the experimental data, an experiment in J-PARC using natPb and 209Bi samples were carried out. The samples were thin foils with about 0.1 mm thick and 25 mm × 25 mm square and were irradiated with protons at kinematic energy points of 0.4GeV, 2.2GeV, and 3.0 GeV. After the irradiation, the nuclide production cross section was determined by spectroscopic measurement of decay gamma-rays from the samples with HPGe detectors. In this paper, 14 nuclide production cross sections for lead and bismuth were obtained. They were compared with the calculated cross sections with various models and the evaluated one.

Pion-nucleon scattering at high energies

1966 ◽  
Vol 289 (1419) ◽  
pp. 500-508 ◽  
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Charge Exchange ◽  
Cross Sections ◽  
Scattering Amplitude ◽  
Forward Scattering Amplitude ◽  
Nucleon Scattering ◽  
Total Cross Sections ◽  
High Energies ◽  
Pion Nucleon

The charge exchange forward scattering amplitude 1.1 1.2 using an interpolation of the total cross sections which includes the results presented by Dr Galbraith at this meeting. From F (-) follows a prediction for the charge exchange forward cross section (c.m. system) 1.3 which will be compared with the experimental data including those presented by Dr Falk-Vairant and Dr Guerriero.

scholarly journals HEAVY QUARK PHOTOPRODUCTION IN THE SEMIHARD APPROACH AT HERA AND BEYOND

1996 ◽  
Vol 11 (01) ◽  
pp. 25-35 ◽  
Author(s):  
V.A. SALEEV ◽  
N.P. ZOTOV
Keyword(s):  
Experimental Data ◽  
Heavy Quark ◽  
Cross Section ◽  
Cross Sections ◽  
Gluon Distribution ◽  
Longitudinal Polarization ◽  
Factorization Approach ◽  
Total Cross Sections ◽  
Small X ◽  
Saturation Effects

Processes of heavy quark photoproduction at HERA energies and beyond are investigated using the semihard (k⊥ factorization) approach. Virtuality and longitudinal polarization of gluons in the photon-gluon subprocess as well as the saturation effects in the gluon distribution function at small x have been taken into account. The total cross-sections, rapidity and p⊥ distributions of the charm and beauty quark photoproduction have been calculated. The results are compared with ZEUS experimental data for charm photoproduction cross-section.

Elastic total cross-sections in an RSIIp scenario

2016 ◽  
Vol 25 (10) ◽  
pp. 1650084 ◽  
Author(s):  
R. Arceo ◽  
Omar Pedraza ◽  
L. A. López ◽  
L. Valencia-Palomo ◽  
E. González-Espinosa ◽  
...  
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Cross Sections ◽  
Extra Dimensions ◽  
Length Scale ◽  
Electromagnetic Potential ◽  
Total Cross Sections

The total elastic nucleon–nucleus cross-section is calculated at energies up to 600 MeV for the elements [Formula: see text]C, [Formula: see text]Pb, [Formula: see text]O, 9Be, 4He, 2H, [Formula: see text]U and [Formula: see text]Al using a finite electromagnetic potential, which is obtained considering a Randall–Sundrum II scenario modified by the inclusion of [Formula: see text] compact extra dimensions. The length scale bound is set in the potential to compare with known experimental data.

K+ PRODUCTION FROM pp AND pd INTERACTIONS

2005 ◽  
Vol 20 (02n03) ◽  
pp. 677-679 ◽  
Author(s):  
◽  
YURY VALDAU
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Production Cross ◽  
Input Parameter ◽  
Threshold Region ◽  
Model Calculations ◽  
Total Cross Sections ◽  
Theoretical Predictions ◽  
Important Input ◽  
Wide Scatter

The K+-production cross section in pn collisions is an important input parameter for model calculations of K+ production in proton-nucleus and nucleus-nucleus interactions. Experimental data in the close-to-threshold region are not yet available and theoretical predictions give a wide scatter of numbers for the ratio of the total cross sections [Formula: see text]. K+ production from pd interaction has been investigated using the magnetic spectrometer ANKE at COSY-Jülich at proton beam momenta 2.65, 2.81 and 3.46 GeV/c. For the extraction of [Formula: see text] from the pd data at low beam momenta, a naive phase-space approach has been used, assuming that [Formula: see text]. Double differential cross sections and missing mass spectra for proton-kaon correlations have also been analysed. Both methods give consistent result: [Formula: see text]. During a recent beam time, experimental data have been collected at pp=3.46 GeV/c for both hydrogen and deuterium targets. A ratio [Formula: see text] has been extracted from these data.

scholarly journals Total cross sections of eγ → $$ eX\overline{X} $$ processes with X = μ, γ, e via multiloop methods

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Roman N. Lee ◽  
Alexey A. Lyubyakin ◽  
Vyacheslav A. Stotsky
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Elliptic Integral ◽  
High Energy ◽  
Calculation Methods ◽  
Complete Elliptic Integral ◽  
Total Cross Sections ◽  
Multiloop Calculation ◽  
The Cross ◽  
Analytical Expressions

Abstract Using modern multiloop calculation methods, we derive the analytical expressions for the total cross sections of the processes e−γ →$$ {e}^{-}X\overline{X} $$ e − X X ¯ with X = μ, γ or e at arbitrary energies. For the first two processes our results are expressed via classical polylogarithms. The cross section of e−γ → e−e−e+ is represented as a one-fold integral of complete elliptic integral K and logarithms. Using our results, we calculate the threshold and high-energy asymptotics and compare them with available results.

ISOSPIN DECOMPOSITION OF pp → NNππ CROSS SECTIONS — DO WE SEE A SIGN OF Δ(1600) EXCITATION IN THE nnπ+π+ CHANNEL?

2009 ◽  
Vol 24 (02n03) ◽  
pp. 450-453
Author(s):  
◽  
T. SKORODKO ◽  
M. BASHKANOV ◽  
D. BOGOSLOWSKY ◽  
H. CALÉN ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Pion Production ◽  
Significant Contribution ◽  
Differential Cross Sections ◽  
Pp Collisions ◽  
Theoretical Predictions ◽  
Order Of Magnitude ◽  
The Cross

The two-pion production in pp-collisions has been investigated in exclusive measurements from threshold up to Tp = 1.36 GeV . Total and differential cross sections have been obtained for the channels pnπ+π0, ppπ+π-, ppπ0π0 and also nnπ+π+. For intermediate incident energies Tp > 1 GeV , i.e. in the region, which is beyond the Roper excitation but at the onset of ΔΔ excitation the total ppπ0π0 cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the nnπ+π+ cross section is a factor of five larger than predicted. A model-unconstrained isospin decompostion of the cross section points to a significant contribution of an isospin 3/2 resonance other than the Δ(1232). As a possible candidate the Δ(1600) is discussed.

scholarly journals Measurement of the 241Am(n,2n)240Am cross section at 17.5 MeV

2019 ◽  
Vol 21 ◽  
pp. 160
Author(s):  
A. Kalamara ◽  
R. Vlastou ◽  
M. Diakaki ◽  
M. Kokkoris ◽  
M. Anastasiou ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Beam ◽  
Cross Sections ◽  
Reaction Cross ◽  
Activation Technique ◽  
Tandem Accelerator ◽  
Hpge Detectors ◽  
Reaction Cross Sections ◽  
Reference Reaction ◽  
High Radioactivity

The 241Am(n,2n)240Am reaction cross section has been measured at neutron beam energy 17.5 MeV, relative to the 27Al(n,α)24Na, 197Au(n,2n)196Au and 93Nb(n,2n)92mNb reference reaction cross sections, using the activation technique. The irradiation was carried out at the Van der Graaff 5.5 MV Tandem accelerator laboratory of NCSR “Demokritos” with monoenergetic neutron beam provided by means of the 3H(d,n)4He reaction, implementing a new Ti-tritiated target. The high purity Am target has been constructed at IRMM, Geel, Belgium and consisted of 40 mg 241Am in the form of AmO2 pressed into pellet with Al2O3 and encapsulated into Al container. Due to this high radioactivity (5 GBq), the Am target was enclosed in a Pb container for safety reasons. After the end of the irradiation, the activity induced by the neutron beam at the target and reference foils, was measured off-line by two 100%, a 50% and a 16% relative efficiency, HPGe detectors.

scholarly journals Study of the 165Ho(n,2n)164Ho reaction at near threshold energies

2020 ◽  
Vol 27 ◽  
pp. 160
Author(s):  
Efstathia Georgali ◽  
N. Patronis ◽  
A. Anastasiadis ◽  
M. Axiotis ◽  
Z. Eleme ◽  
...  
Keyword(s):  
Cross Sections ◽  
Isomeric State ◽  
Ground State ◽  
Preliminary Analysis ◽  
Reaction Channel ◽  
Activation Technique ◽  
Monoenergetic Neutron ◽  
Theoretical Predictions ◽  
Threshold Energies ◽  
Near Threshold

The present work concerns the preliminary analysis for the study of the (n,2n) reaction channel of the 165Ho isotope at near threshold energies: 10.1, 10.4 and 10.7 MeV (Eth=8.04 MeV). The cross sections for the population of both the ground state (Jπ=1+) and the isomeric state (Jπ=6-, Eex=139.8 keV) of the 164Ho product-nucleus were measured at the afore mentioned energies via the activation technique relative to the 27Al(n,α)24Na and 197Au(n,2n)196Au reactions. The quasi-monoenergetic neutron beams were produced through the 2H(d,n)3He reaction in the 5.5 MV Tandem Van de Graaf accelerator of N.C.S.R ''Demokritos''. The preliminary experimental results are compared with theoretical predictions based on TALYS code.

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