10 research outputs found
Cross-sections for the multiparticle reaction at = 40 95 MeV
The bremsstrahlung flux-averaged cross-sections and the cross-sections per equivalent photon
were measured for the
photonuclear multiparticle reaction at bremsstrahlung end-point
energies ranging from 40 MeV to 95 MeV. The experiments were performed using
the beam from the NSC KIPT electron linear accelerator LUE-40 with the use of
the -activation technique. The bremsstrahlung quantum flux was
calculated with the program GEANT4 and, in addition, was monitored by means of
the reaction. The cross-sections
were computed using the TALYS1.9 code with the default options. The
measured average cross-sections
and have appeared to be
higher by factors of 2.0 to 2.4 than the theoretical results. The experimental
results have been found to be in good agreement with the data of other
laboratories. Consideration is given to special features of calculation of
and for the
reaction, with occurrence of
three photodisintegration channels. The paper also discusses
the possibility of using the
reaction for monitoring the bremsstrahlung -quantum flux in the photon
energy region above 30 MeV.Comment: 16 pages, 6 figures, 1 tabl
Isomeric pair in photonuclear reactions on Mo at end-point bremsstrahlung energy of 35-95 MeV
The Nb photonuclear reaction
was studied using the electron beam from the NSC KIPT linear accelerator
LUE-40. Experiment was performed using the activation and off-line -ray
spectrometric technique. The experimental isomeric yield ratio was
determined for the reaction products at the end-point
bremsstrahlung energy range of 35-95 MeV. The obtained
values of are in satisfactory agreement with the
results of other authors and extend the range of previously known data. The
theoretical values of the yields and the
isomeric yield ratio for the isomeric pair from the reaction were
calculated using the partial cross-sections from the TALYS1.95 code
for six different level density models . The comparison showed a noticeable
excess (more than 3.85 times) of the experimental isomeric yield ratio over all
theoretical estimates. At the investigated range of the
theoretical dependence of on energy was confirmed -
the isomeric yield ratio smoothly decreases with increasing energy.Comment: 9 pages, 9 figures, 1 tabl
Magnetic system for cleaning the gamma beam at the LUE-40 electron linac output
The bremsstrahlung of accelerated electrons passing through a converter is
used to study multiparticle photo-nuclear reactions. The results of
calculations, numerical modeling, design, and testing of a special magnetic
cleaning system to obtain a "pure" beam of bremsstrahlung quanta when studying
the cross-sections of such reactions at the LUE-40 linac are presented. The
system is based on commercially available permanent magnets of rectangular
cross-sections. The maximum on-axis field is 0.9 T, which provides sufficient
separation of the electron beam and gamma rays at a distance of more than 90 mm
from the magnet.Comment: 9 pages, 8 figure
Production of Hf in photoproton reaction Ta at energy = 35-95 MeV
The production of the nuclei in the photoproton
reaction was studied at end-point bremsstrahlung
energies = 35-95 MeV. The experiment was performed at the
electron linear accelerator LUE-40 NSC KIPT with the use of the
activation and off-line -ray spectroscopy.
The experimental values of the bremsstrahlung flux-averaged cross-sections
for the
reaction were determined, and at
MeV obtained for the first time.
The measured values, also as the literature data, are significantly exceed
the theoretical flux-averaged cross-sections . The values were calculated using the cross-section
computed with the TALYS1.95 code for six different level density
models.
A comparative analysis of the calculated total cross-sections for the
reactions and
was performed. It was shown that the
photoproton to photoneutron strength ratio is
consistent with the estimates based on the isospin selection rules and the
value from the experiment.Comment: 9 pages, 4 figures, 2 table
Photonuclear reactions cross-sections at energies up to 100 MeV for different experimental setups
In experiments on the electron linac LUE-40 of RDC "Accelerator" NSC KIPT,
the flux-averaged cross-sections of photonuclear reactions
,
,
,
, and
were measured using the
-activation technique. The theoretical flux-average cross-sections
were computed using the
partial cross-section values from the TALYS1.9-1.95 codes and
bremsstrahlung -flux calculated using GEANT4.9.2. Two different
experimental setups were used in the experiments: an aluminum electron absorber
and a deflecting magnet to clean the bremsstrahlung -flux from
electrons. A comparison of the flux-average cross-sections measured for two
experimental setups was performed. The possibility of using the reactions
,
,
,
, and
as monitors of the bremsstrahlung
-flux for the energy range 30-100 MeV was investigated.Comment: 8 pages, 6 figures, 1 tabl
Photoneutron cross-sections for the reactions
The flux-averaged cross-sections for the – reactions have been measured at the end-point bremsstrahlung energies of 80–95 MeV. The experiments were performed by using the beam from the NSC KIPT electron linear accelerator LUE-40 and measuring the residual -ray activities of the reaction products. The theoretical values were computed using the mono-energetic cross-sections from TALYS1.9 code. A comparison between the measured average cross-sections and the theoretical values show good agreement for the – reactions but substantial differences for the and reactions. Isomeric average cross-section ratios of a product produced from the reaction have been obtained. The results have been compared with the literature data and the theoretical values based on TALYS1.9 code
Cross-sections for the multichannel reaction with the 28.3 mev difference of the reaction thresholds
The bremsstrahlung flux-averaged cross-sections and the cross-sections per equivalent photon
were first measured for
the photonuclear multichannel reaction
at end-point bremsstrahlung
gamma energies ranging from 35 MeV to 95 MeV. The experiments were performed
with the beam from the NSC KIPT electron linear accelerator LUE-40 with the use
of the -activation technique. The bremsstrahlung quantum flux was
calculated with the program GEANT4.9.2 and, in addition, was monitored by means
of the reaction. The flux-averaged
cross-sections were calculated using the partial cross-section
values computed with the TALYS1.95 code for different level density models.
Consideration is given to special features of calculating the cross-sections
and for the case of the final nucleus
production in the photodisintegration reaction via several
partial channels : .Comment: 8 pages, 9 figures, 1 table, 19 references. arXiv admin note: text
overlap with arXiv:2012.1447