scholarly journals Neutron reaction studies in the rare earth region: First results for the 162Er(n,2n)161Er physics case

2019 ◽  
Vol 22 ◽  
pp. 45
Author(s):  
N. Patronis ◽  
X. Aslanoglou ◽  
M. Axiotis ◽  
Z. Eleme ◽  
V. Foteinou ◽  
...  
Keyword(s):  
Rare Earth ◽  
Experimental Method ◽  
Cross Section ◽  
Reaction Cross Section ◽  
Reaction Cross ◽  
Activation Technique ◽  
Reaction Study ◽  
Neutron Reaction ◽  
First Results ◽  
Threshold Energies

In the present work the first experimental results at near two threshold energies for the 162Er(n,2n)161Er reaction study are presented. The reaction cross section was determined at the energies of 11.0 and 11.3 MeV by means of the activation technique. The experimental method and setup is described.

An Am/Be neutron source and its use in integral tests of differential neutron reaction cross-section data

2010 ◽  
Vol 68 (9) ◽  
pp. 1656-1661 ◽  
Author(s):  
M.S. Uddin ◽  
M.R. Zaman ◽  
S.M. Hossain ◽  
I. Spahn ◽  
S. Sudár ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Source ◽  
Reaction Cross Section ◽  
Reaction Cross ◽  
Cross Section Data ◽  
Section Data ◽  
Neutron Reaction

scholarly journals Activation cross section of the (n,2n) reaction on Hf isotopes

2019 ◽  
Vol 23 ◽  
pp. 47
Author(s):  
A. Kalamara ◽  
M. Serris ◽  
A. Spiliotis ◽  
D. Sigalos ◽  
N. Patronis ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Reaction Cross Section ◽  
Beam Energy ◽  
Reaction Cross ◽  
Activation Technique ◽  
Incident Neutron ◽  
Activation Cross Section ◽  
Reference Reaction

Cross sections of the 174Hf(n,2n)173Hf and 176Hf(n,2n)175Hf reactions have been experimentally determined relative to the 27Al(n,α)24Na reference reaction at incident neutron energies of 15.3 and 17.1 MeV by means of the activation technique. The irradiations were carried out at the 5 MV tandem T11/25 Accelerator Laboratory of NCSR "Demokritos" with monoenergetic neutron beams provided via the 3H(d,n)4He reaction, using a new Ti-tritiated target of 373 GBq activity. In the determination of the 176Hf(n,2n)175Hf reaction cross section the contamination of the 174Hf(n,γ)175Hf and 177Hf(n,3n)175Hf reactions has been taken into account. Moreover, the neutron beam energy has been studied by means of Monte Carlo simulation codes and the neutron flux has been determined via the 27Al(n,α)24Na reference reaction.

scholarly journals CROSS SECTIONS OF (p,pxn) REACTIONS IN Au197

1961 ◽  
Vol 39 (8) ◽  
pp. 1172-1183 ◽  
Author(s):  
T. M. Kavanagh ◽  
R. E. Bell
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Heavy Nucleus ◽  
Target Nucleus ◽  
Reaction Cross Section ◽  
Reaction Cross ◽  
Total Reaction Cross Section ◽  
Incident Proton ◽  
Diffuse Surface ◽  
Threshold Energies

Cross sections of (p,pn), (p,p2n), and (p,p3n) reactions in Au197 have been measured by the activation method for incident proton energies up to 86 Mev. The curves of cross section as a function of energy have similar shapes for the three reactions. They rise from apparent thresholds at about 16, 21, and 30 Mev, respectively, to peak values of 180, 145, and 150 mb at proton energies about 30 Mev higher than the apparent threshold energies. The cross sections are much larger than those predicted from the statistical and cascade-evaporation theories, and they are interpreted in terms of two-body collisions in the diffuse surface of the target nucleus. A combination of these results with measured (p,xn) cross sections yields an approximation to the total reaction cross section of a heavy nucleus.

scholarly journals Study of the 193Ir(n,2n)192Ir Reaction Cross Section

2019 ◽  
Vol 24 ◽  
pp. 29
Author(s):  
N. Patronis ◽  
A. Kalamara ◽  
S. Harissopulos ◽  
M. Kokkoris ◽  
A. Lagoyannis ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Beam ◽  
Ground State ◽  
Reaction Cross Section ◽  
Hpge Detector ◽  
Deuteron Beam ◽  
Reaction Cross ◽  
Total Reaction Cross Section ◽  
Activation Technique ◽  
State 1

The 193Ir(n,2n)192Ir reaction cross section was measured relative to the 27Al(n,a)24Na and 197Au(n,2n)196Au reactions by means of the activation technique at two neutron beam energies: 10.0 and 10.5 MeV. The neutron beam was produced via the 2H(d,n)3Ηe reaction. The deuteron beam was provided by the 5.5 MV Tandem Van de Graaff accelerator of the N.C.S.R. “Demokritos”. After the irradiations the induced activity of the samples was measured through a 56% relative efficiency HPGe detector. The total reaction cross section for the population of the ground state (4+) and the first isomeric state (1-) was determined. The adopted method for the correction concerning the population of the product nucleus 192Ir through the 191Ir(n,γ)192Ir reaction is also presented.

scholarly journals Study of the (n,2n) reaction cross section on 174,176Hf isotopes

2020 ◽  
Vol 15 ◽  
pp. 188
Author(s):  
M. Serris ◽  
Et Al.
Keyword(s):  
Statistical Model ◽  
Cross Section ◽  
Neutron Energy ◽  
Energy Region ◽  
Reaction Cross Section ◽  
Reaction Cross ◽  
Activation Technique ◽  
Tandem Accelerator ◽  
Model Calculations ◽  
Input Parameters

Cross section measurements of the 174Hf(n,2n)173Hf and 176Hf(n,2n)175Hf reactions have been performed at the VdG Tandem accelerator of NCSR “Demokritos” in Athens, in the neutron energy region from 8.8 to 11.5 MeV, using the activation technique. Statistical model calculations based on the Hauser - Feshbach theory have also been implemented by using the code EMPIRE-II with different sets of input parameters. The predictions were compared to the data of the present work as well as data from literature.

scholarly journals High-energy neutron facility at the Athens Tandem Accelerator NCSR “Demokritos”

2019 ◽  
Vol 21 ◽  
pp. 123 ◽  
Author(s):  
R. Vlastou ◽  
M. Anastasiou ◽  
A. Kalamara ◽  
M. Diakaki ◽  
M. Kokkoris ◽  
...  
Keyword(s):  
Cross Section ◽  
Reaction Cross Section ◽  
Neutron Fluence ◽  
High Energy ◽  
Reaction Cross ◽  
Activation Technique ◽  
Tandem Accelerator ◽  
Foil Activation ◽  
Energy Neutron ◽  
Neutron Facility

In the 5.5 MV tandem T11/25 Accelerator Laboratory of NCSR “Demokritos” monoenergetic neutron beams have been produced in the energy range ∼16–19 MeV using a new Ti-tritiated target of 373 GBq activity, by means of the 3H(d,n)4He reaction. The corresponding beam energies obtained from the accel- erator, were 0.8–3.7 deuterons. The maximum flux has been determined to be of the order of 106 n/s·cm2, implementing reference reactions. An investigation of the energy dependence of the neutron fluence has been carried out with the multiple foil activation technique. The beam has been used for the measurement of (n,2n) reaction cross section on several isotopes at 16.7 and 17 MeV.

scholarly journals Experimental study of the 197Au(n,2n) reaction cross section

2019 ◽  
Vol 17 ◽  
pp. 9
Author(s):  
A. Tsinganis ◽  
M. Kokkoris ◽  
A. Lagoyannis ◽  
E. Mara ◽  
C. T. Papadopoulos ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Isomeric State ◽  
Reaction Cross Section ◽  
Reaction Cross ◽  
Activation Technique ◽  
Incident Neutron ◽  
Mcnp Code ◽  
Foil Activation ◽  
24Na Reaction

In the present work, the 197Au(n,2n) reaction cross section is experimentally determined relative to the 27Al(n,α)24Na reaction at incident neutron energies of 9.0 to 10.5 MeV by means of the activation technique. The quasi-monoenergetic fast neutron beam was produced via the 2H(d,n)3He reaction at the 5.5 MV Tandem Van de Graaff accelerator at the NCSR “Demokritos” and was studied to determine the contribution of background “parasitic” neutrons using the multiple foil activation technique and the SULSA unfolding code. The cross sections for the population of the second isomeric state (12−) of 196Au and the sum of the ground (2−) and first isomeric state (5−) population cross sections were independently determined. Auxiliary Monte Carlo simulations were performed with the MCNP code.

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