scholarly journals Boutique neutrons advance 40Ar/39Ar geochronology

2019 ◽  
Vol 5 (9) ◽  
pp. eaaw5526
Author(s):  
Daniel Rutte ◽  
Paul R. Renne ◽  
Jonathan Morrell ◽  
Liqiang Qi ◽  
Mauricio Ayllon ◽  
...  
Keyword(s):  
Neutron Generator ◽  
Nuclear Reactions ◽  
Fine Grained ◽  
Fusion Neutron ◽  
Strong Resonance ◽  
Fission Spectrum ◽  
Accuracy And Precision ◽  
Dating Method ◽  
Fission Reactors ◽  
Ar Geochronology

We designed and tested a compact deuteron-deuteron fusion neutron generator for application to 40Ar/39Ar geochronology. The nearly monoenergetic neutrons produced for sample irradiation are anticipated to provide several advantages compared with conventional fission spectrum neutrons: Reduction of collateral nuclear reactions increases age accuracy and precision. Irradiation parameters within the neutron generator are more controllable compared with fission reactors. Confidence in the prediction of recoil energies is improved, and their likely reduction potentially broadens applicability of the dating method to fine-grained materials without vacuum encapsulation. Resolution of variation in the 39K(n,p)39Ar neutron capture cross section at 1.3 to 3.2 MeV and discovery of a strong resonance at ~2.4 MeV illuminate future pathways to improve the technique for 40Ar/39Ar dating.

scholarly journals Electronically driven neutrons synthesis-generator with the magneto-optical flow seal

2019 ◽  
Vol 222 ◽  
pp. 02014
Author(s):  
Mikhail Dolgopolov ◽  
Albina Gurskaya ◽  
Andrey Privalov ◽  
Vitaly Radenko ◽  
Alexandr Radenko ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Optical Flow ◽  
Neutron Generator ◽  
Nuclear Reactions ◽  
Theoretical Description ◽  
Light Nuclei ◽  
Plasma Target

We develop the description of a neutron generator construction for the synthesis of light nuclei. The design of the neutron generator with plasma target is given together with a description of the types of nuclear reactions that are implemented in it. The brief theoretical description of the ion multiphase flow in the synthesis generator is considered.

scholarly journals A Review of In Situ Isotopic Studies of the Oklo and Bangombé Natural Fission Reactors Using Microbeam Analytical Techniques

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1060
Author(s):  
Hiroshi Hidaka
Keyword(s):  
Nuclear Reactions ◽  
Fission Products ◽  
Analytical Techniques ◽  
Laser Probe ◽  
The Past ◽  
Isotopic Analyses ◽  
Isotopic Studies ◽  
Reactor Materials ◽  
Fission Reactors

Isotopic analyses of elements in the natural reactor materials have often been performed to understand the distribution behaviors of the fission products and to evaluate the function of nuclear reactions since the first discovery of a natural reactor in 1972. Several types of unique microminerals, including significant amounts of fission products, have been found in and around the Oklo and the Bangombé natural reactors. In the past two decades, microbeam techniques using ion and laser probe facilities have been effectively applied for the in situ isotopic analyses of individual microminerals to investigate the migration behaviors of fissiogenic radioisotopes produced in the reactors. This paper presents a review of interpretations of the isotopic results of microminerals found in and around the natural reactors.

A full-digital multidimensional redundancy control system for high intensity D-T fusion neutron generator

2018 ◽  
Vol 106 ◽  
pp. 367-371
Author(s):  
Yong Zhang ◽  
Yongfeng Wang ◽  
Zhigang Wang ◽  
Chao Liu ◽  
Jianye Wang
Keyword(s):  
Control System ◽  
High Intensity ◽  
Neutron Generator ◽  
Fusion Neutron ◽  
Redundancy Control

Design of the 2.45 GHz ECR Ion Source Control System for High Intensity D–T Fusion Neutron Generator

2015 ◽  
Vol 34 (3) ◽  
pp. 584-591
Author(s):  
Weitian Wang ◽  
Yong Song ◽  
Jianye Wang ◽  
Yongfeng Wang ◽  
Gang Song
Keyword(s):  
Control System ◽  
High Intensity ◽  
Neutron Generator ◽  
Ion Source ◽  
Source Control ◽  
Ecr Ion Source ◽  
Fusion Neutron

scholarly journals Fast neutron spectrum unfolding of a TRIGA Mark II reactor and measurement of spectrum-averaged cross sections: integral tests of differential cross sections of neutron threshold reactions

2013 ◽  
Vol 101 (10) ◽  
pp. 613-620 ◽  
Author(s):  
M. S. Uddin ◽  
S. Sudár ◽  
S. M. Hossain ◽  
R. Khan ◽  
M. A. Zulquarnain ◽  
...  
Keyword(s):  
Fast Neutron ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Neutron Field ◽  
Fast Neutrons ◽  
Metal Foils ◽  
Spectrum Unfolding ◽  
Fission Spectrum ◽  
Data Files ◽  
Triga Mark Ii

Summary The spectrum of fast neutrons having energies from 0.5 to 20 MeV in the core of the 3MW TRIGA Mark II reactor at Savar, Dhaka, Bangladesh, was unfolded by activating several metal foils to induce threshold nuclear reactions covering the whole spectrum, and then doing necessary iterative calculations utilizing the activation results and the code SULSA. The analysed shape of the spectrum in the TRIGA core was found to be similar to that of the pure 235U-fission spectrum, except for the energies between 0.5 and 1.5 MeV, where it was slightly higher than the fission spectrum. Spectrum-averaged cross sections were determined by integral measurements. The integral values measured in this work were compared with the recommended values for a pure fission spectrum as well as with the integrated data deduced from measured and evaluated excitation functions of a few reactions given in some data files. The good agreement between integral measurements and integrated data in case of well-investigated reactions shows that the fast neutron field at the TRIGA Mark II reactor can be used for validation of evaluated data of neutron threshold reactions.

scholarly journals 64Cu production by 14 MeV neutron beam

2020 ◽  
Vol 22 (2-3) ◽  
pp. 257-264
Author(s):  
M. Capogni ◽  
M. Capone ◽  
A. Pietropaolo ◽  
A. Fazio ◽  
G. Dellepiane ◽  
...  
Keyword(s):  
Nuclear Medicine ◽  
Neutron Beam ◽  
Nuclear Reactions ◽  
Target Material ◽  
Production Method ◽  
Research Center ◽  
Radiochemical Analysis ◽  
Fusion Neutron ◽  
Primary Activity ◽  
Activity Measurements

64Cu is an emerging radionuclide of great interest in personalized nuclear medicine. It is produced by a cyclotron via the reaction 64Ni(p,n)64Cu. This production method increased during the last decades, because small biomedical cyclotrons can be easily installed close to the nuclear medicine department of a hospital. As a matter of fact, 64Ni is a very expensive target material. For this reason, an alternative 64Cu production method was investigated at ENEA by using the quasi-monochromatic 14 MeV fusion neutron beam made available at the Frascati Neutron Generator (FNG) located at the ENEA – Frascati Research Center. In particular, two nuclear reactions were studied: 65Cu(n,2n)64Cu and 64Zn(n,p)64Cu. The radiochemical analysis of the activated samples was performed at the ENEA-NMLNWM laboratory located in ENEA-Casaccia Research Center. The activity measurements were carried out at the ENEA-INMRI, located in the ENEA-Casaccia Research Center, with high metrological level conditions and by assuring their traceability to the 64Cu primary activity standard here developed and maintained. A prediction of the 64Cu production by means of the high-brilliance 14 MeV neutron source named Sorgentina is also discussed.

Development of Convergent D-D Fusion Neutron Generator with Large Pulse Current

2007 ◽  
Vol 52 (4) ◽  
pp. 1101-1104 ◽  
Author(s):  
Masami Ohnishi ◽  
Osawa Hodaka ◽  
Tomoya Furukawa ◽  
Takashi Suma
Keyword(s):  
Neutron Generator ◽  
Pulse Current ◽  
Fusion Neutron ◽  
Large Pulse

A Novel Vacuum System Control Strategy for High Intensity D–T Fusion Neutron Generator

2016 ◽  
Vol 35 (4) ◽  
pp. 613-620
Author(s):  
Weitian Wang ◽  
Yong Song ◽  
Jianye Wang ◽  
Peng Xu ◽  
Lingli Kong
Keyword(s):  
Control Strategy ◽  
High Intensity ◽  
Neutron Generator ◽  
Vacuum System ◽  
System Control ◽  
Fusion Neutron
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