scholarly journals Determination of the electric dipole (E1) gamma ray strength function of 56Mn from the Bn level to low levels by two-step gamma cascades

2016 ◽  
Vol 19 (1) ◽  
pp. 83-93
Author(s):  
Son An Nguyen
Keyword(s):  
Cross Section ◽  
Electric Dipole ◽  
Nuclear Reactor ◽  
Gamma Ray ◽  
Transition Probabilities ◽  
Strength Function ◽  
Spin Parity ◽  
Coincidence System ◽  
Low Levels

Investigation of gamma ray strength function is necessary to determine some nuclear characteristics, such as: spin, parity, electromagnetic transitions, cross section, … In this research, 55Mn target was activated on the neutron of 3rd horizontal channel of Dalat nuclear reactor. The experimental data was collected by event-event coincidence by gammagamma coincidence system. The 56Mn deexcitation afforded the collected of 49 gamma – gamma twostep cascades. This was applied on shell model to determine the spin, parity, electric dipole gamma strength function (E1) as well as comparing between the theoretical and experimental E1 transition probabilities

Gamma-ray polarization measurements in 22Na

1970 ◽  
Vol 48 (20) ◽  
pp. 2434-2446 ◽  
Author(s):  
A. M. Baxter ◽  
B. W. J. Gillespie ◽  
J. A. Kuehner
Keyword(s):  
Single Crystal ◽  
Gamma Ray ◽  
Mixing Ratio ◽  
Spin Parity ◽  
Polarization Measurements ◽  
Mixing Ratios ◽  
Cast Doubt ◽  
Low Levels

The 19F(α,nγ)22Na reaction was studied using a Ge(Li) single-crystal polarimeter in addition to conventional Ge(Li) counters to elucidate certain spin, parity, and multipole-mixing ratio assignments to low levels of 22Na. The 1.984 MeV level, which had previously been assigned 2+ or 3+, has been shown not to be 3+ and, while 2+ is favored by the experiment, the evidence tends to suggest a problem in the interpretation of the properties of this level. The 2.572 MeV level is shown most likely to have spin and parity 2+. The J = 2 level at 3.059 MeV is clearly established as having even parity. In several cases limits on mixing ratios are obtained. These results cast doubt on certain model identifications made recently in 22Na.

scholarly journals Cross section determination for TAD materials in quasi mono-energetic neutron spectrum from p(Li) reaction

2020 ◽  
Vol 239 ◽  
pp. 20004
Author(s):  
Dusan Kral ◽  
Miroslav Zeman ◽  
Karel Katovsky ◽  
Elmira Melyan ◽  
Robert Holomb
Keyword(s):  
Cross Section ◽  
Gamma Ray ◽  
Neutron Field ◽  
Background Suppression ◽  
Integral Number ◽  
The Right ◽  
Different Sources ◽  
Exfor Database ◽  
Energetic Neutron

Threshold activation detectors (TAD) are of great importance for a determination of neutron energy spectra and flux density. For different sources, it is necessary to choose the right combination of materials that cover the estimated spectra. Several different materials were irradiated in a quasi-monoenergetic neutron field with 29.1 MeV peak neutrons energy in the CANAM facility. Neutrons were produced in p + Li-7 reaction in a thin target and the foils were situated in the proton beam axis and close geometry to the Li target. The integral number of protons was established from accelerator telemetry and lithium target activation measurements after the experiment. During the experiment, one long irradiation was done for following foils: Al, Au, Bi, Co, Cu, Fe, In, Mn, Pb, Ta, V, Y and four short irradiations for foils: Cu, Fe, In, Ta, V, W, Y. The foils were irradiated in a sandwich configuration, sorted by cross-section where the materials with higher cross-section were placed in the back of the sandwich. Neutrons produced in the p + Li-7 reaction have a quasi mono-energetic spectrum which provides a suitable basis for cross-section determination. Experimental results were calculated for (n,xn), (n,p) and (n,α) reactions via the dosimetry foils activation method including a gamma-ray spectroscopy method. Several important spectroscopic corrections have to be applied to increase the accuracy of the obtained results, including neutron background suppression. Experimental data will be submitted to the EXFOR database.

Theoretical photoneutron cross-section calculations on Osmium isotopes by Talys and Empire codes

2019 ◽  
Vol 34 (26) ◽  
pp. 1950210 ◽  
Author(s):  
İsmail Hakki Sarpün ◽  
Hasan Özdoğan ◽  
Kemal Taşdöven ◽  
Hüseyin Ali Yalim ◽  
Abdullah Kaplan
Keyword(s):  
Cross Section ◽  
Gamma Ray ◽  
Level Density ◽  
Strength Function ◽  
Reaction Cross ◽  
Density Parameter ◽  
Photoneutron Reaction ◽  
Level Density Models ◽  
Osmium Isotopes ◽  
Strength Functions

In this study, the level density parameter and the gamma ray strength function effects on photoneutron reaction cross-section calculations for Osmium isotopes were investigated by employing available level density models and gamma ray strength functions within Talys v1.8 and Empire v3.1 nuclear codes. A relative variance analysis was done to determine the best gamma ray strength function. Then, the effect of level density models for the photoneutron reactions was investigated by using the best gamma ray strength function. The results were compared with each other and also with the experimental data taken from the literature.

scholarly journals DETERMINATION OF THE NEUTRON CAPTURE CROSS SECTION FOR THE Co59(n,γ)Co60m REACTION

1953 ◽  
Vol 31 (4) ◽  
pp. 391-395 ◽  
Author(s):  
N. Moss ◽  
L. Yaffe
Keyword(s):  
Cross Section ◽  
Neutron Capture ◽  
Capture Cross Section ◽  
Nuclear Reactor ◽  
Mean Value ◽  
Pure Gold ◽  
Capture Cross ◽  
Neutron Capture Cross Section ◽  
The Mean

A determination of the neutron capture cross section of Co59 leading to the excited state of Co60 has been made by the activation method. Samples of cobalt were irradiated in the center of the Chalk River nuclear reactor in a pure iron capsule using a pneumatic delivery device. The cobalt activity was counted in a windowless counter and compared with the activity of a strip of pure gold irradiated under identical conditions in the same container. The cobalt and gold were counted with and without cadmium wrapping and the contribution due to epicadmium neutrons allowed for in the calculation. The mean value obtained was 18.3 ± 1.7 barns relative to σAu197 = 93 barns.

scholarly journals Developing reliable reaction gamma-ray data

2018 ◽  
Vol 178 ◽  
pp. 06005 ◽  
Author(s):  
Paraskevi Dimitriou ◽  
T. Belgya ◽  
Y-S. Cho ◽  
D. Filipescu ◽  
R. Firestone ◽  
...  
Keyword(s):  
Cross Section ◽  
Giant Dipole Resonance ◽  
Gamma Ray ◽  
Strength Function ◽  
Basic Sciences ◽  
Global Models ◽  
Resonance Parameters ◽  
Dipole Resonance ◽  
Function Data ◽  
Photon Strength Function

We report on efforts to develop reliable photonuclear cross section and photon strength function data by measuring, compiling, assessing, evaluating the available data, and producing tables of Giant Dipole Resonance parameters and global models for use in basic sciences and applications.

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