MEASUREMENT OF PHOTOFISSION CROSS-SECTION OF 238U USING MICROTRON FACILITY

2011 ◽  
Vol 20 (11) ◽  
pp. 2361-2375
Author(s):  
H. G. RAJ PRAKASH ◽  
GANESH SANJEEV ◽  
K. B. VIJAY KUMAR ◽  
H. G. HARISH KUMAR ◽  
K. SIDDAPPA ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Radiation Energy ◽  
Track Detector ◽  
Fission Barrier ◽  
Bremsstrahlung Radiation ◽  
Nuclear Track Detector ◽  
Tantalum Target ◽  
Fragment Angular Distribution ◽  
Good Agreement

Photofission cross-section of 238U was measured using bremsstrahlung radiation energy 7.4–9.0 MeV with energy step of 0.4 MeV by employing Lexan polycarbonate film as solid state nuclear track detector (SSNTD). The photon intensity from the Microtron accelerator at a distance of 15 cm from the bremsstrahlung converter (tantalum target) facility was estimated to be 1010 photons/sec using the code EGS-4. In this paper, details of the fission fragment angular distribution measurements of 238U target using Lexan polycarbonate have been discussed. The photofission cross-section was calculated using the angular distribution of fission fragments and the results were compared with those obtained using the code EMPIRE-II and various barrier parameters of the RIPL-1, RIPL-2 libraries and with the new analytical fission barrier formula based on the Hugenholtz–Van Hove theorem. The present experimental measurements were in good agreement with the results obtained from the Empire-II code predictions for potential parameter taken from RIPL-1 and a newly developed analytical fission barrier formula.

Measurement of cross-sections for charge pickup by 12C on elemental targets at 290MeV/n

2021 ◽  
Author(s):  
Tian-Li Ma ◽  
Jun-Sheng Li ◽  
Hui-Ling Li ◽  
Ming-Ming Xu ◽  
Rui-Xia Yang ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Nuclear Charge ◽  
Track Detector ◽  
Nuclear Track Detector ◽  
Target Mass ◽  
The Cross

The nuclear charge pickup cross-sections of [Formula: see text]C on CH2, C, Al, Cu and Pb targets at the highest energy of 288[Formula: see text]MeV/n were investigated using CR-39 nuclear track detector. The cross-section for H was calculated from those measured on C and CH2 targets. The dependence of charge pickup cross-section on target mass was investigated. It was found that the nuclear charge pickup cross-section of [Formula: see text]C at our studied beam energies seems to exponentially depend on the target mass with the fitting exponent [Formula: see text], which can be well explained by the peripheral and the surface collisions of the nuclear charge pickup reactions.

Investigation on Neutron-Induced Fission Fragment Angular Distribution of 232Th and 238U

2018 ◽  
Vol 73 (11) ◽  
pp. 1075-1081
Author(s):  
Soleiman Rasouli ◽  
A.N. Behkami ◽  
R. Razavi ◽  
Amir Abbas Sabouri Dodaran ◽  
M.R. Bayati
Keyword(s):  
Angular Distribution ◽  
Cross Section ◽  
Fission Fragment ◽  
Statistical Modelling ◽  
Incident Neutron ◽  
Maximum Probability ◽  
Accurate Analysis ◽  
High Resolution Data ◽  
Fragment Angular Distribution ◽  
Induced Fission

AbstractFission fragment angular distribution (FFAD) data would help obtain new insights into both the fission process and the mechanism of the projectile’s interaction with the nucleus. Recently, a structure has been reported in neutron-induced FFAD of even-even actinide nuclei near threshold. Statistical modelling is used in this article to analyse FFAD from neutron-induced fission of 238U and 232Th. The statistical variance K02 is obtained by fitting the measured fragment anisotropies with a theoretical model. Accurate analysis is performed to deduce the variance K02 of the K-distribution of the levels in the transition nucleus at neutron energies from threshold to 50 MeV. We show the method by which quantitative values of K02 can be obtained. The results not only present high-resolution data in these even-even nuclei but also show that for the 238U(n,f) reaction, the strength for the K-transition states comes mainly from the higher angular momenta, in agreement with the Nilsson model orbitals. We also study the periodic structure of anisotropy related to the set of (n,f) reactions in comparison with the related cross section performed with the TALYS code. The comparison of the variance with the cross section clearly illustrates the strong correlation between the value of the variance and the opening of a fission chance. We show that whenever the probability of reaction in a new channel and cross section increases, K02 decreases versus the incident neutron energy, so the minimum of K02 can show the maximum probability of the (n,f)xn reaction.

FISSION FRAGMENT ANGULAR DISTRIBUTION IN 24Mg INDUCED REACTIONS ON 192Os AND 197Au

2008 ◽  
Vol 17 (02) ◽  
pp. 419-424 ◽  
Author(s):  
R. TRIPATHI ◽  
K. SUDARSHAN ◽  
S. SODAYE ◽  
A. GOSWAMI ◽  
A. V. R. REDDY ◽  
...  
Keyword(s):  
Statistical Theory ◽  
Angular Distribution ◽  
Fission Fragment ◽  
Coulomb Barrier ◽  
Angular Distributions ◽  
Distribution Data ◽  
Theory Analysis ◽  
Fission Fragments ◽  
Fragment Angular Distribution ◽  
Good Agreement

Angular distributions of fission fragments have been measured in 24 Mg + 192 Os and 24 Mg + 197 Au reactions at E lab = 128 MeV which is close to entrance channel Coulomb barrier. Experimental angular anisotropies were in reasonably good agreement with those calculated using the statistical theory. Analysis of the angular distribution data of the present study and of our earlier measurement in 19 F + 197 Au reaction has shown that contribution from non-compound nucleus fission in these systems is not significant.

scholarly journals Cross sections of the 89Y(p,γ) reaction relevant to the p process

2019 ◽  
Vol 11 ◽  
Author(s):  
P. Tsagari ◽  
M. Kokkoris ◽  
E. Skreti ◽  
P. Demetriou ◽  
S. Galanopoulos ◽  
...  
Keyword(s):  
Statistical Theory ◽  
Angular Distribution ◽  
Cross Section ◽  
Cross Sections ◽  
Relative Efficiency ◽  
Reaction Rates ◽  
Hpge Detectors ◽  
The Cross ◽  
Good Agreement

The cross section of the 89Y(p,7)90Zr reaction was determined at Ep=l.4-4.8 MeV via angle-integrated measurements carried out by means of a 4π Nal summing detector as well as via angular distribution measurements using an array of 4 HPGe detectors with 100% relative efficiency. The resulting cross sections vary from 0.5 to 5 mb. Astrophysical S factors and reaction rates have also been derived. A good agreement between the experimental rates and and the predictions of statistical theory has been found.

scholarly journals An experimental cross-section measurement of 10B(n,α)7Li reaction on counting alpha particles track density

2018 ◽  
Vol 16 (37) ◽  
pp. 108-117
Author(s):  
Khalid R. Flyah
Keyword(s):  
Mathematical Model ◽  
Cross Section ◽  
Chemical Etching ◽  
Track Detector ◽  
Alpha Particles ◽  
Nuclear Track Detector ◽  
Etching Solution ◽  
Section Measurement ◽  
The Mathematical Model ◽  
The Relationship

The present work determines the particle size based only on the number of tracks detected in a cluster created by a hot particle on the CR-39 solid state nuclear track detector and depending on the exposure time. The mathematical model of the cross section developed here gives the relationship between alpha particle emitting from the (n, α) reaction and the number of tracks created and distribution of tracks created on the surface of the track detector. In an experiment performed during this work, disc of boron compound (boric acid or sodium tetraborate) of different weights were prepared and exposed to thermal neutron from the source. Chemical etching is processes of path formation in the detector, during which a suitable etching solution attacks the detector at a sufficient speed and the damaged regions along the ion trails (latent track) are preferentially dissolved, removed and get transformed into a hollow channel. The most common etching for plastics is the aqueous solutions of NaOH and temperatures in between 50˚C - 80˚C.The program (CR-39) processing counting and calculations only take place depending on the number of tracks.

Experimental investigation and modelling of light scattering in a-Si:H solar cells deposited on glass/ZnO:Al substrates

2002 ◽  
Vol 715 ◽  
Author(s):  
J. Krc ◽  
M. Zeman ◽  
O. Kluth ◽  
F. Smole ◽  
M. Topic
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Solar Cells ◽  
Angular Distribution ◽  
Light Scattering ◽  
Optical Model ◽  
Distribution Functions ◽  
Interface Roughness ◽  
Scattering Parameters ◽  
Good Agreement

AbstractThe descriptive scattering parameters, haze and angular distribution functions of textured ZnO:Al transparent conductive oxides with different surface roughness are measured. An approach to determine the scattering parameters of all internal interfaces in p-i-n a-Si:H solar cells deposited on the glass/ZnO:Al substrates is presented. Using the determined scattering parameters as the input parameters of the optical model, a good agreement between the measured and simulated quantum efficiencies of the p-i-n a-Si:H solar cells with different interface roughness is achieved.

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