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Grants

RFBR Grant # 96-02-18012

RFBR Grant # 97-02-16184

ISTC Grant # 554

ISTC Grant # 609

RFBR Grant # 00-02-17876

ISTC Grant # 554-2

ISTC Grant # 1971

RFBR Grant # 96-02-18012

The title of this Project is "Experimental study of the heavy nuclei fission reaction induced by neutrons with energy up to 200 MeV". The Russian Foundation for Basic Research (RFBR) supported initial part of GNEIS program of the fast neutron induced fission cross-section measurements.
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RFBR Grant # 97-02-16184

   The title of this Project is "The research of space parity violation and of the neutron magnetic properties in the reactions with heavy nuclei". The Russian Foundation for Basic Research (RFBR) supported two groups of scientists according to RFBR application # 97-02-16184: one - GNEIS group (PNPI, Gatchina, Russia), second - ITEP group (Moscow, Russia). The GNEIS part of this Project had the title "Measurement of the neutron total cross-sections of lead isotopes" and consisted with three stages. At first stage (1997) RFBR Grant # 97-02-16184 funded final part of measurement of the neutron total cross-section of ²⁰⁸Pb performed at GNEIS facility during number of years. Purpose of this measurement was to evaluate electric polarizability of neutron. The results of this measurement are presented. Second stage (1998) of RFBR Grant # 97-02-16184 was devoted to joint analysis of total cross-sections of ²⁰⁸Pb and ¹²C. This method gives possibility to eliminate influence of the distortions caused by uncertainties of experimental background in neutron polarizability estimation. The results of this investigation are presented. At third stage (1999) RFBR Grant # 97-02-16184 supported total cross-section of ²⁰⁷Pb measurement performed at GNEIS facility. Measurement with ²⁰⁷Pb was carried out with the aim to obtain more exact corrections to be taken into account for other lead isotope admixtures in neutron total cross-section of ²⁰⁸Pb measured in main experiment of GNEIS program of neutron polarizability estimation. Additional motivation of this measurement is that numerical data on neutron total cross-sections of lead isotopes are scarce and at low energies - practically absent. Measurement of the total cross-section of ²⁰⁷Pb have been performed in collaboration of scientists from GNEIS (PNPI, Gatchina, Russia) and ITEP (Moscow, Russia). The results of this stage of RFBR Grant # 97-02-16184 are presented.
   The Project is successfully completed now.
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ISTC Grant # 554

   The title of this Project is "Measurements of the Fission Neutron Multiplicity Distribution in Spontaneous Fission of ²⁴⁴Cm, ²⁴⁸Cm and in Fission of ²³³U and ²³⁹Pu Induced by Thermal and Low Energy Neutrons". The only part "Measurements of the Fission Neutron Multiplicity Distribution in Spontaneous Fission of ²⁴⁴Cm, ²⁴⁸Cm" was funded. The aim of the Project was to measure two-dimensional multiplicity distributions of fission neutrons emitted simultaneously by each complementary fragment for each specific fragment mass and kinetic energy. The measurements were carried out for the isotopes ²⁴⁴Cm, ²⁴⁸Cm and for ²⁵²Cf as reference nucler. The twin large liquid scintillator detector was used in the experiments. This Project have been performed in collaboration of scientists from GNEIS, (PNPI, Gatchina, Russia), the specialists from KRI (St Petersburg, Russia) and IRMM of Joint Research Center European Commission (Geel, Belgium). The results of these measurements are presented.
   Successful implementation of the Project resulted in exclusive data of multiplicity distribution of neutrons. Earlier such data does not exist. This data gives assist in understanding the fission process and in creating atomic fission models. Obtained data can be used for applied tasks in the development of a transmutation of radioactive wastes into non-radiotoxic wastes.
   This Project was supported financially by European Community and performed under the contract to the International Science and Technology Center (ISTC). The funded part of the Project is successfully completed now.
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ISTC Grant # 609

   The title of this Project is "Neutron Induced Fission Cross-sections of Some Actinides and other Heavy Nuclei in Energy Region 1-200 MeV". The purpose of this Project was to obtain neutron fission cross-sections of ²³³U, ²³⁸U, ²³²Th, ²³⁷Np, ²³⁹Pu, Pb(nat) and ²⁰⁹Bi relative to ²³⁵U by means of new measurements in the energy range from 1 MeV to 200 MeV. Among new applications of this data the most important are accelerator - driven transmutation of waste reactor materials and energy production, peaceful uses of weapon plutonium, accelerator and spaceship shielding, radiation therapy, etc.
   The measurements have been carried out at the time-of flight neutron spectrometer GNEIS in Gatchina at fast neutron beam # 5. The fission cross-section ratios were measured for several isotopes using two multiplate fission ionization chambers simultaneously. The values of fission cross-section ratio have been obtained with statistical accuracy 1-3 % and then converted to absolute cross-sections using the evaluated fission cross-section of ²³⁵U. This Project have been performed in collaboration of scientists from GNEIS, (PNPI, Gatchina, Russia), the specialists from KRI (St Petersburg, Russia) and Nuclear Data Center of JAERI (Tokyo, Japan). The results of these measurements are presented both for actinide nuclei and for lead and bismuth.
   This Project was supported financially by Japan and performed under the contract to the International Science and Technology Center (ISTC). The Project is successfully completed now.
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RFBR Grant # 00-02-17876

   The title of RFBR application # 00-02-17876 is "The research of parity violation and of the neutron electromagnetic properties in the reactions with heavy nuclei". The GNEIS part of this Project has the title "Measurement of the neutron total cross-sections of lead isotopes" and is continuation of GNEIS program of total cross section investigation of lead isotopes began in the course of RFBR Grant # 97-02-16184. Motivation is just the same as in RFBR Grant # 97-02-16184: to take into account for other lead isotope admixtures in neutron total cross-section of ²⁰⁸Pb measured in main experiment of GNEIS program of neutron polarizability estimation and, in addition, numerical data on neutron total cross-sections of lead isotopes are scarce and at low energies - practically absent. The GNEIS part of Project consists with two stages. At first stage (2000) RFBR Grant # 00-02-17876 funded measurement of the neutron total cross-section of ²⁰⁶Pb in the energy range from 1 eV to 20 keV performed at GNEIS facility. This stage is successfully completed now and the results are presented. At second stage (2001) RFBR Grant # 00-02-17876 will fund measurement of the neutron total cross-section of ²⁰⁴Pb in the energy range from 1 eV to 100 eV that will be perform at GNEIS facility. Planed accuracy will be about 5%. Both stages will be perform in collaboration of scientists from GNEIS (PNPI, Gatchina, Russia) and ITEP (Moscow, Russia).
   The Project is in progress now.
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ISTC Grant # 554-2

   The title of this Project is "Measurements of the Fission Neutron Multiplicity Distribution in Spontaneous Fission of ²⁴⁴Cm, ²⁴⁸Cm and in Fission of ²³³U and ²³⁹Pu Induced by Thermal and Low Energy Neutrons". This Project is continuation of the ISTC Project 554 in part of induced fission. The same twin large liquid scintillator detector as in ISTC Project 554 and neutron beam from the research reactor WWR-M (PNPI, Gatchina, Russia) will be used in the experiments. This Project will be performed in collaboration of scientists from GNEIS, (PNPI, Gatchina, Russia), the specialists from KRI (St Petersburg, Russia) and Vanderbilt University (Nashville, USA).
   This Project is supported financially by USA and approved for funding now for begining. The Project will be perform under the contract to the International Science and Technology Center (ISTC).
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ISTC Grant # 1971

   The title of this Project is "Neutron Induced Fission Cross-Sections of ²⁴⁰Pu, ²⁴³Am and W in the Energy Range 1–200 MeV". The purpose of this Project is to obtain neutron-induced fission cross-sections for ²⁴⁰Pu, ²⁴³Am and W by means of new measurements in the neutron energy range up to 200 MeV. The values of the cross-sections to be obtained are intended for use as nuclear data for accelerator-driven transmutation and energy production problem, as well as for the problem of secondary standard in intermediate energy region and some other applications.
   The experimental part of the Project includes preparation of fissile targets, measurements, experimental data processing and production of the neutron induced fission cross-sections for ²⁴⁰Pu, ²⁴³Am and W relative to ²³⁵U with an accuracy 3-10% in the energy range 1–200 MeV. The measurements will be carried out using neutron time-of-flight spectrometer GNEIS at neutron beam # 5. Recently, within the framework of the ISTC Project 609, the fission cross-section ratios for ²³³U, ²³⁸U, ²³²Th, ²³⁷Np, ²³⁹Pu, Bi and Pb relative to ²³⁵U have been measured using GNEIS facility.
   At present, the world scientific community disposes only a few neutron sources suitable for the neutron cross-section measurements at intermediate energies. Such measurements are very expensive and therefore have a high priority within the framework of international cooperation. Besides scientists from GNEIS, (PNPI, Gatchina, Russia), the specialists from KRI (St Petersburg, Russia) and Nuclear Data Center of JAERI (Tokyo, Japan) will be involved in the Project.
   This Project was submitted to ISTC and wait for Board Decision.
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Grants

Last update January 1, 2002
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