Measurement of the 238U(n,γ)239U and 238U(n,2n)237U Reaction Cross Sections Using a Neutron Activation Technique at Neutron Energies of 8.04 and 11.90 MeV

2014 ◽  
Vol 178 (1) ◽  
pp. 66-75 ◽  
Author(s):  
R. Crasta ◽  
S. Ganesh ◽  
H. Naik ◽  
A. Goswami ◽  
S. V. Suryanarayana ◽  
...  
Keyword(s):  
Neutron Activation ◽  
Cross Sections ◽  
Reaction Cross ◽  
Activation Technique ◽  
Neutron Activation Technique ◽  
Reaction Cross Sections

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 Measurement of 14.54 ± 0.24 MeV neutron activation reaction cross sections of 93Nb, natMo with covariance analysis

2020 ◽  
Vol 325 (3) ◽  
pp. 863-868
Author(s):  
Imran Pasha ◽  
Rudraswamy Basavanna ◽  
Santhi Sheela Yerranguntla ◽  
Saraswatula Venkata Suryanarayana ◽  
Rebecca Pachuau ◽  
...  
Keyword(s):  
Neutron Activation ◽  
Cross Sections ◽  
Reaction Cross ◽  
Covariance Analysis ◽  
Activation Reaction ◽  
Reaction Cross Sections

Nonequilibrium effects in α-particle induced reactions on gallium isotopes

1989 ◽  
Vol 67 (9) ◽  
pp. 870-875 ◽  
Author(s):  
I. A. Rizvi ◽  
M. K. Bhardwaj ◽  
M. Afzal Ansari ◽  
A. K. Chaubey
Keyword(s):  
Cross Sections ◽  
Residual Nucleus ◽  
Reaction Cross ◽  
Activation Technique ◽  
Individual Reaction ◽  
Reaction Channels ◽  
Stacked Foil Activation Technique ◽  
The Individual ◽  
Reaction Cross Sections

The stacked foil activation technique and Ge(Li) γ-ray spectroscopy have been employed for the determination of the excitation functions, up to 60 MeV, of six reactions, 69Ga(α,n), (α,2n), (α,3n), (α,p3n); 71Ga(α,n) and (α,4n). Since natural gallium used as the target has two odd-mass stable isotopes of abundance, 69Ga(60.1%) and 71Ga(39.9%), their activation in some cases gives the same residual nucleus through different reaction channels, but with very different Q values. In such cases, the individual reaction cross sections are separated with the help of the ratio of their theoretical cross sections. A preliminary theoretical comparison with the preequilibrium geometry-dependent hybrid (GDH) model has been done using an initial exciton number no = 4 (2n + 2p + 0h), and general agreement was found for all reactions at high energies.

Analysis of the excitation function of alpha-particle-induced reactions on natural silver

1996 ◽  
Vol 74 (9-10) ◽  
pp. 618-625 ◽  
Author(s):  
H. B. Patel ◽  
M. S. Gadkari ◽  
Bhruna Dave ◽  
N. L. Singh ◽  
S. Mukherjee
Keyword(s):  
Cross Sections ◽  
Gamma Ray ◽  
Residual Nucleus ◽  
Reaction Cross ◽  
Activation Technique ◽  
Individual Reaction ◽  
Reaction Channels ◽  
Stacked Foil Activation Technique ◽  
The Individual ◽  
Reaction Cross Sections

Excitation functions of the reactions 107Ag[(α, n); (α, 2n); (α, αn); (α, α2n)] and,109Ag[(α, 2n); (α, 3n); (α, 4n); (α, α3n); (α, α4n)] were investigated up to 70 MeV by the stacked foil activation technique and Ge(Li) gamma-ray spectroscopy method. Since the natural silver used as the target has two odd mass stable isotopes of abundance 51.83% (107Ag) and 48.17% (109Ag), their activation in some cases gives the same residual nucleus through different reaction channels, but with very different Q values. In such cases, the individual reaction cross sections are separated with the help of the ratio of theoretical cross sections. The experimental cross sections were compared with the predictions of a pre-equilibrium hybrid model. The (α, xn) reactions are fairly well reproduced with initial exciton number n0 = 4(4p0h), whereas (α, αxn) reactions are underestimated in magnitude by a factor of five to six.

MEASUREMENT OF 79Br(n, 2n)78Br, 63Cu(n,2n)62Cu, 58Ni(n,2n)57Ni, 54Fe(n,2n)53Fe, 50Cr(n, 2n)49Cr AND 46Ti(n, 2n)45Ti REACTION CROSS-SECTIONS AT 14.7 MeV NEUTRON ENERGY

1993 ◽  
Vol 02 (01) ◽  
pp. 259-264 ◽  
Author(s):  
G.R. PANSARE ◽  
V.N. BHORASKAR
Keyword(s):  
Compound Nucleus ◽  
Neutron Energy ◽  
Cross Sections ◽  
Reaction Cross ◽  
Activation Technique ◽  
Semiempirical Relation ◽  
Reaction Cross Sections

Cross-sections of the reactions 79 Br (n, 2n)78 Br , 63 Cu (n,2n)62 Cu , 58 Ni (n, 2n)57 Ni , 54 Fe (n, 2n)53 Fe , 50Cr(n, 2n)49Cr and 46 Ti (n, 2n)45 Ti induced by 14.7 MeV neutrons are measured with reference to 27Al(n, ∝)24 Na and 56 Fe (n, p)56 Mn reactions using activation technique and also derived theoretically using compound nucleus model, semiempirical relation and ALICE code. Accuracy around 5% was achieved in measurement of these reaction cross-sections which is better compared to existing literature values.

scholarly journals (p,γ) Reaction Cross Sections Relevant to the p process: First Results for the Se Isotopes

2020 ◽  
Vol 13 ◽  
pp. 161
Author(s):  
A. Lagoyannis ◽  
A. Spyrou ◽  
S. Harissopulos ◽  
S. Galanopoulos ◽  
R. Kunz ◽  
...  
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Reaction Cross ◽  
Activation Technique ◽  
Nuclear Level ◽  
Proton Capture ◽  
Model Calculations ◽  
Level Densities ◽  
First Results ◽  
Reaction Cross Sections

Proton-capture reaction cross sections of Se isotopes were determined in the 1-6 MeV energy range by means of γ-angular distribution measurements as well as via the activation technique. In this report we compare our first cross-section results with statistical model calculations performed using various microscopic and phenomenological approaches of Optical Model Potentials and Nuclear Level Densities.

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