scholarly journals Measurement of the 242Pu(n,f) cross-section at the CERN n_TOF facility

2019 ◽  
Vol 22 ◽  
pp. 28
Author(s):  
A. Tsinganis ◽  
E Berthoumieux ◽  
C. Guerrero ◽  
N. Colonna ◽  
M. Calviani ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Wide Energy Range ◽  
Minor Actinides ◽  
Theoretical Cross Section ◽  
Plutonium Isotopes ◽  
Nuclear Systems ◽  
Wide Energy ◽  
Neutron Cross Sections ◽  
Empire Code

Knowledge of neutron cross-sections of various plutonium isotopes and other minor actinides is crucial for the design of advanced nuclear systems. The 240,242Pu(n,f) cross-sections were measured at the CERN n_TOF facility, taking advantage of the wide energy range (from thermal to GeV) and the high instantaneous flux of the neutron beam. In this work, preliminary results are presented along with a theoretical cross-section calculation performed with the EMPIRE code.

scholarly journals Setup for the measurement of the 235U(n, f) cross section relative to n-p scattering up to 1 GeV

2020 ◽  
Vol 239 ◽  
pp. 01008
Author(s):  
A. Manna ◽  
O. Aberle ◽  
V Alcayne ◽  
S. Amaducci ◽  
J. Andrzejewski ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Recoil Proton ◽  
High Energy ◽  
Section Data ◽  
Nuclear Systems ◽  
Biological Effectiveness ◽  
Induced Fission ◽  
Set Up ◽  
Neutron Cross Sections

The neutron induced fission of 235U is extensively used as a reference for neutron fluence measurements in various applications, ranging from the investigation of the biological effectiveness of high energy neutrons, to the measurement of high energy neutron cross sections of relevance for accelerator driven nuclear systems. Despite its widespread use, no data exist on neutron induced fission of 235U above 200 MeV. The neutron facility n_TOF offers the possibility to improve the situation. The measurement of 235U(n,f) relative to the differential n-p scattering cross-section, was carried out in September 2018 with the aim of providing accurate and precise cross section data in the energy range from 10 MeV up to 1 GeV. In such measurements, Recoil Proton Telescopes (RPTs) are used to measure the neutron flux while the fission events are detected and counted with dedicated detectors. In this paper the measurement campaign and the experimental set-up are illustrated.

scholarly journals Study of the process $$e^+e^- \rightarrow \eta \pi ^0\gamma $$ in the energy range $$\sqrt{s} = {1.05-2.00}$$ GeV with the SND detector

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
M. N. Achasov ◽  
A. Yu. Barnyakov ◽  
A. A. Baykov ◽  
K. I. Beloborodov ◽  
A. V. Berdyugin ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Center Of Mass ◽  
Wide Energy Range ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Wide Energy ◽  
Radiation Processes ◽  
Using Data ◽  
First Time

AbstractThe process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ is studied in the center-of-mass energy range 1.05–2.00 GeV using data with an integrated luminosity of 94.5 $$\hbox {pb}^{-1}$$ pb - 1 collected by the SND detector at the VEPP-2000 $$e^{+}e^{-}$$ e + e - collider. The $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ cross section is measured for the first time. It is shown that the dominant mechanism of this reaction is the transition through the $$\omega \eta $$ ω η intermediate state. The measured cross section of the subprocess $$e^+e^-\rightarrow \omega \eta \rightarrow \eta \pi ^0\gamma $$ e + e - → ω η → η π 0 γ is consistent with previous measurements in the $$e^+e^-\rightarrow \pi ^+\pi ^-\pi ^0\eta $$ e + e - → π + π - π 0 η mode. It is found, with a significance of $$5.6\sigma $$ 5.6 σ , that the process $$e^+e^-\rightarrow \eta \pi ^0\gamma $$ e + e - → η π 0 γ is not completely described by hadronic vector-pseudoscalar intermediate states. The cross section of this missing contribution, which can originate from radiation processes, e. g. $$e^+e^-\rightarrow a_{0}(1450)\gamma $$ e + e - → a 0 ( 1450 ) γ , is measured. It is found to be 15–20 pb in the wide energy range from 1.3 to 1.9 GeV.

The Thermal Neutron Cross Section and the Resonance Integral of 184Os, 190Os, 192Os, 64Zn, 68Zn and 59Co

1968 ◽  
Vol 9 (2-3) ◽  
Author(s):  
J. I. Kim ◽  
F. Adams
Keyword(s):  
Neutron Activation ◽  
Thermal Neutron ◽  
Cross Section ◽  
Cross Sections ◽  
Neutron Cross Section ◽  
Resonance Integral ◽  
Activation Measurement ◽  
Thermal Neutron Cross Section ◽  
Neutron Cross Sections

SummaryBy neutron activation measurement with a cadmium filter, using gold as a standard monitor, the thermal neutron cross sections and the resonance integrals of

scholarly journals Be7(n,p)Li7 Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN

2018 ◽  
Vol 121 (4) ◽  
Author(s):  
L. Damone ◽  
M. Barbagallo ◽  
M. Mastromarco ◽  
A. Mengoni ◽  
L. Cosentino ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Wide Energy Range ◽  
Wide Energy ◽  
The Cross

Differential and integral electron scattering cross sections from tetrahydrofuran (THF) over a wide energy range: 1–10 000 eV

2014 ◽  
Vol 68 (6) ◽  
Author(s):  
Martina C. Fuss ◽  
Ana G. Sanz ◽  
Francisco Blanco ◽  
Paulo Limão-Vieira ◽  
Michael J. Brunger ◽  
...  
Keyword(s):  
Energy Range ◽  
Electron Scattering ◽  
Cross Sections ◽  
Wide Energy Range ◽  
Scattering Cross ◽  
Wide Energy ◽  
Scattering Cross Sections

Channel-specific dielectronic recombination of Ge(XXXII), Se(XXXIV), and Kr(XXXVI)

2004 ◽  
Vol 82 (4) ◽  
pp. 277-289 ◽  
Author(s):  
G El Machtoub
Keyword(s):  
High Temperature ◽  
Energy Range ◽  
Cross Sections ◽  
Emission Spectra ◽  
Dielectronic Recombination ◽  
Wide Energy Range ◽  
Wide Energy

We present explicit calculations of channel-specific dielectronic recombination cross sections for hydrogen-like germanium, Ge(XXXII); selenium, Se(XXXIV); and krypton, Kr(XXXVI). The convoluted cross sections characterize K-shell emission spectra over a wide energy range where contributions from high-n (n = 2–10), satellite lines are included. The high-n contributions presented are important for better diagnostics in the domain of high-temperature plasmas. PACS Nos.: 32.30.Rj, 32.70.Rm, 34.70.te

scholarly journals Be7(n,α)He4Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN

2016 ◽  
Vol 117 (15) ◽  
Author(s):  
M. Barbagallo ◽  
A. Musumarra ◽  
L. Cosentino ◽  
E. Maugeri ◽  
S. Heinitz ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Wide Energy Range ◽  
Wide Energy ◽  
The Cross

A new empirical formula for cross-sections of (n,nα) reactions

2020 ◽  
Vol 29 (08) ◽  
pp. 2050062
Author(s):  
Mustafa Yiğit
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Empirical Formula ◽  
Nuclear Reactions ◽  
Measured Cross Section ◽  
Future Studies ◽  
Present Formalism ◽  
The Cross ◽  
Neutron Cross Sections ◽  
Good Agreement

Studies on the cross-sections of (n,n[Formula: see text]) reactions which are energetically possible, about 14 MeV neutrons are quite scarce. In this paper, the cross-sections of (n,n[Formula: see text] nuclear reactions at [Formula: see text]14–15 MeV are analyzed by using a new empirical formula based on the statistical theory. We show that neutron cross-sections are closely related to the [Formula: see text]-value of nuclear reaction, in particular for (n,n[Formula: see text]) channels. Results obtained with this empirical formula show good agreement with the available measured cross-section values. We hope that the estimations on the cross-sections using the present formalism may be helpful in future studies in this field.

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