About Us

neutrondata

RESERCHES IN THE FIELD OF TOP QUALITY NEUTRON DATA FOR NEW CONCEPTS IN NUCLEAR TECHNOLOGY

A thorough knowledge of the interaction of neutrons with matter is of fundamental importance to assess the safe operation of nuclear reactors, model the ageing of presently operating power plants, develop new and advanced reactor concepts and for various technological applications in energy production, mining, non-destructive testing, etc. The JRC has an active program in the measurement for basic neutron data, data for application in nuclear safety, advanced fuel cycles and waste management strategies like transmutation, accelerator driven systems and the possible use of Thorium fuel cycle. The Neutron Data Laboratory of INRNE is developing collaboration with IRMM-JRC Institute that is a major contributor of neutron data, important for various sciences (physics, medicine, astrophysics, etc.) and technology.

Thorium neutron cross sections investigations

The thorium-uranium fuel cycle is very attractive because the natural resources of thorium exceed considerably those of uranium and because this cycle limits the build-up of highly radioactive transuranium nuclides. Accelerator Driven Systems, based on the Th – U fuel cycle, are also studied to incinerate the waste of the first generation of nuclear power plants. The 232Th(n,g) cross section has a strong impact on the performance and safety assessment of such advanced systems. In a sensitivity study of a fusion-fission hybrid system, the production rate of 233U can be predicted within 1%, provided that the 232Th(n,γ) cross section between 3 keV and 3000 keV is known to within 2 %. For fast breeder reactors the most important region for capture in 232Th is from 10 keV to 100 keV. A 10% uncertainty on the data can produce a 30 % uncertainty on the proton current requirement to operate an ADS at the sub-critical level of keff ~ 0.97.The neutron capture cross section of thorium has been measured in the energy region from 4 keV to 140 keV at the Time-of-Flight facility GELINA of the Institute for Reference Material and Measurements in Geel (Belgium). The capture events were detected by two C6D6 liquid scintillators, placed at 14.37 m distance from the neutron source. The systematic uncertainties related to the normalization and weighting function, using an internal saturated resonance, is less than 1%. An additional systematic uncertainty of 0.5 % results from the self-shielding and multiple scattering corrections. Using the level statistical models the average resonance parameters for the unresolved resonance region have been derived.

Activation neutron-induced reaction cross section measurements.

Activation cross sections are needed to determine activity levels induced during the reactors operation and for low-activation materials development. Of special interest is production of long-lived radionuclides whose decay activities impact the scenario of waste management and materials recycling. One of the major radionuclides of importance to the medium-term waste management consideration is 60Co. Two of the important reactions leading to the production of 60Co, namely natNi(n,p)60m+gCo, and 63Cu(n,a)60m+gCo have been studied. The processes of hydrogen and helium gas production, caused by (n,xp), (n,xα) reactions, make an impact on mechanical characteristics of structural materials. In total 21 (n,α), (n,p), (n,np), (n,n΄γ), (n,2n) activation reactions on different isotopes of Co, Ni, Cu, Zr, and Pb have been measured from the threshold to 20 MeV, predominantly above 13 MeV.The investigations were performed in conformity with requirements of high priority request list that is edited by the OECD Working Party on International Evaluation Co-operation (WPEC). The irradiations were carried out at 7 MV Van de Graaff accelerator. In addition new results have been obtained for the isomeric cross section ratios of the 58Ni(n,p)58m,gCo, the 60Ni(n,p)60m,gCo and 59Co(n,2n)58m,gCo reactions. Ten reactions have been measured for the first time in this energy range.

Colaboration with JRC

Two Bulgarian specialists obtained the position of visiting scientists in IRMM, two became grant holders as detached national experts and post doc and one young physicist is completing now his PhD thesis. Two IRMM scientists presented lectures on the summer school for young physicists in Varna, Bulgaria in 2003 and 2005.

 

Scientists

Member Occupation E-mail Phone
Nina Tomova Koyumdjieva Associate Professor, Ph.D. - Head of the Laboratory Този имейл адрес е защитен от спам ботове. Трябва да имате пусната JavaScript поддръжка, за да го видите. 5490
Ivan Apostolov Sirakov Assistant Professor, Ph.D. Този имейл адрес е защитен от спам ботове. Трябва да имате пусната JavaScript поддръжка, за да го видите. 5497
Valentina Minkova Semkova Assistant Professor, Ph.D. Този имейл адрес е защитен от спам ботове. Трябва да имате пусната JavaScript поддръжка, за да го видите. 5449
Ivan Nikolov Ruskov Scientist Този имейл адрес е защитен от спам ботове. Трябва да имате пусната JavaScript поддръжка, за да го видите. 5471
Tihomir Petkov Madjarski Assistant Professor, Ph.D. 5498
Dimitar Nikolov Grozdanov Scientist 5499
Ivaylo Zhivkov Ivanov Scientist Този имейл адрес е защитен от спам ботове. Трябва да имате пусната JavaScript поддръжка, за да го видите. 5497
Neli Kirilova Ilieva Scientist Този имейл адрес е защитен от спам ботове. Трябва да имате пусната JavaScript поддръжка, за да го видите. 5449
Tonka Angelova Lyubenova Technologist Този имейл адрес е защитен от спам ботове. Трябва да имате пусната JavaScript поддръжка, за да го видите. 5449
Valentina Nikolaevna Ilcheva Technologist 5497

Projects

Publications

LIST OF IMPORTANT PUBLICATIONS

 

A Spectrometer for Measurement of the Neutron Capture Gamma Multiplicity at a Stationary Research Reactor
Yu.V. Adamchuk, A.L.Kovtun, G.V. Muradyan and Yu.G. Shchepkin G.Georgiev, N.Kalinkova, E.Moravska, N.Stancheva, N.Tchikov and N.Janeva Nucl. Instr. and Meth. in Phys. Res. A236 (1985) 105-108
Fluctuation Factors of Average Cross Sections for Overlepping Resonances
N. Janeva, N. Koyumdjieva, A. Lukyanov and S. Toshkov Radiation Effects, V.96, 273-276, (1986)
Multilevel Analysis of Pu-239 Neutron Cross Sections in the Resolved Resonance Region
V. Kolesov, A. Lukyanov, S. Toshkov and N. Janeva, Radiation Effects, V.96, 277-280, (1986)
Nuclear Data for 235U, 238U and 239Pu in the Unresolved Resonance Region
A.A. Vankov, V.F. Ukraintsev, N. Janeva, S. Toshkov and A. Mateeva Nuclear Science and Engineering, 96, 122-136 (1987)
A setup for precise measurement of resonance neutron capture by self-indication
N. Janeva, S. Toshkov, G.V. Muradyan, Yu.V. Grigorjev, G. Georgiev, I. Sirakov, V.G. Tishin and Yu.S. Zamjatnin Nucl. Instr. and Meth. in Phys. Res. A313 (1992) 266-272
Determination of 147Sm and 148Sm resonance parameters
G. Georgiev, Yu.S. Zamjatnin, L.B. Pikelner, G.V. Muradyan, Yu.V. Grigorjev, T. Madjarski, N. Janeva Nucl. Phys. A565 (1993) 643-656
Characteristic functions in the statistical R-matrix theory
N. Koyumdjieva, A.A. Lukyanov, N. Janeva Zeitschrift fur Physik A v.353, N1, 31-34, 1995
Multilevel parametrization of resonance neutron cross sections
A.A. Luk’yanov N.B. Yaneva Phys. Part. Nucl. 28 (4), July-August 1997
Validation of the Characteristic Function Model for the Unresolved Resonance Region
N.T. Koymdjieva, N.B. Janeva, K.N. Volev .Nuclear Science and Engineering v. 137, No 2, February 2001, p. 194-205
Neutron Absorption of Iron-boride Layer over Low Carbon Steel
N. Gidikova, S. Yaneva, N. Janeva Materials letters, 55 (2002) 365-359
Measurement of the 232Th neutron capture cross-section in the region 5 keV-150 keV.
G. Lobo, F. Corvi, P. Schillebeeckx, N. Janeva, A. Brusegan, P. Mutti Journal of Nuclear Science and Technology, Supplement 2, (August 2002) 429-432,
Resonance Self-shielding in the Actinides
N.Janeva, N. Koyumdjieva, A. Lukyanov, K. Volev Journal of Nuclear Science and Technology, Supplement 2, (August 2002) 944-946,
U-235 Alpha Value in Thermal Neutron Energy Point
Yu.V. Adamchuk, M.A.Voskanyan, A.L. Kovtun, G.V. Muradyan, Yu.G.Shchepkin, G..P. Georgiev, N.S. Stancheva, N.F. Tchikov and N.B. Janeva Comptes rendues de l’Academie Bulgare de Sciences T.39, N10, 59-61, 1986
Fluctuations Factors of Average Cross-Sections in R-Matrix Theory
N. Koymdjieva, N. Savova, N. Janeva, A.A. Lukyanov Bulg. J. Phys., V16, N1, 13-18, 1989
Study of a Characteristic Function in Statistical R-matrix Theory
M.N. Alami, N.Janeva and A. Lukyanov Bulg. J.Phys., v.18, N4, 276-280, 1991
Gamma Multiplicity in Thermal Neutron Capture by Hf nuclei
G. Georgiev, T. Madjarski, N. Stancheva, N. Chikov, N. Janeva, G.V. Muradyan Bulg. J.Phys., v.18, N1, 1-8, 1991
A Neutron Method for Estimation of the Isotopic Ratio of 10B and 11B
I. Penev, B. Damyanov, N. Janeva, N. Shukov, B. Kunov, L. Dimitrov
Activation Cross Section Measurements Relevant to the Future Investigations on High Intens Neutron Generator NG-12
V.Semkova, N.Janeva BGNS Transactions, Vol. 3, #1, 1998, 50-53
Transmission and Self-indication Measurements with 235U and 239Pu in the 2 eV-20 KeV Energy Region
T. Bakalov, G. Ilchev, S. Toshkov, Tran Khan Mai, N. Janeva, A.A.Vankov, Yu.V. Grigoriev, V.F. Ukraintsev NBS Special Publications 594, Nucl. Cross Sections for Technology, Knoxvill, USA, 692-697 1980
Study of Resonance Neutron Cross Section Structure of 238U and 239Pu
T. Bakalov, G. Ilchev, S. Toshkov, Tran Khan Mai, N. Janeva, A.A.Vankov, Yu.V. Grigoriev Int. Conf. on Nucl. Data for Science and Technology, Antverp, Belgium, 62-64, 1982
Nuclear data for 235U, 238U and 239Pu in the unresolved resonance region.
Natalia Janeva III-th IAEA Advisory Group Meeting on Transactinium Isotope Nuclear data, Upsala, Sweeden, 351-361, 1984
Resonance parameters of 239Pu in the resolved and unresolved region
Natalia Janeva Int. symp. on nuclear fission, Dresden, 58-64, 1985
Measurements and analysis of resonance structure for U-238 total and radiative cross sections in energy range 0.465-200 KeV
Yu.V. Grigoriev, V.N. Kostsheev, G.N. Manturov, V.V. Sinitsa, G.V. Muradyan, G.P. Georgiev, Yu.S. Zamyatnin, B.I. Ivanov, I.A. Sirakov, N.B.Janeva Nucl. Data for Science and Technology, Proc. of Int. Conf. Juelich 1991 83-88, Springer- Verlag,
Modeling of cross sections in the unresolved resonance region
M. Alami, N. Koyumdjieva, A. Lukyanov, N. Janeva Nucl. Data for Science and Technology, Proc. of Int. Conf. Juelich 1991 968-970, Springer- Verlag,
Neutron cross sections modeling in the unresolved resonance region
N.B. Janeva, N. T. Koyumdjieva, A.A., Lukyanov Inp. symp. Nucl data evaluation methodology, BNL, USA, World Scientific, 339-343, 1993
Multiplicity of Gamma-rays Following Neutron Resonance Capture in Sm isotopes and Determination of the Resonance Parameters of 147,148,149Sm
G. Georgiev, Yu.V. Grigor’ev, Yu.S. Zamyatnin, G.V. Muradyan, L.B. Pikelner, H. Fajkov-Stanchik, N. Yaneva ISNES’92, Lodz, Poland, 264-271, 1992
Multiplicity of Gamma-rays in Neutron Resonances of 178Hf and 179Hf
G.P. Georgiev, Yu.V. Grigoriev, G.V. Muradyan and N.B. Janeva
Capture Gamma-ray Spectroscopy and Related Topics, Proc. of the 8th Int. Symp., Fribourg,
Switzerland, Sept. 264-271, 1993, World Scientific Publ. Co
Neutron resonance parameters of 119Sn
G.P. Georgiev, Yu.V. Grigoriev, G.V. Muradyan, N.B.Janeva Nucl. Data for Science and Technology, Proc. of Int. Conf. Gatlinburg, Tennessee, 299-301 1994
Characteristic functions in the statistical R-matrix theory
N.B. Janeva, N. T. Koyumdjieva, A.A., Lukyanov Nucl. Data for Science and Technology, Proc. of Int. Conf. Gatlinburg, Tennessee, 445-447, 1994
Pulsed neutron sources - present status
N. Janeva ISINN-2, 1-17, Dubna,1994
The resonance parameters of 179Hf
N. Janeva, T. Madjarski ISINN-4, Dubna, 177-182, 1997
A neutron method for estimation of the isotopic ratio of 10B and 11B
I. Penev, B. Damyanov, N. Janeva, H. Shukov, B. Kunov and L. Dimitrov Proc. Int. Conf. Neutron and Their Applications, 535-538, June 1994, Crete, Greece
Alternative Methods for Multilevel Resonance Parametrization
A.A. Lukyanov, I.A. Sirakov, N.B. Janeva Conf. Proc. Int. Conf. on Nucl. Data for Science and Technology, Trieste, , 19-24 May 1997, 277-279
Neutron Capture of 232Th in the Unresolved Resonance Region – Data Corrections and Analysis
A. Lukyanov, N. Koyumdjieva, N.Janeva, K. Volev, G. Lobo, F. Corvi, P. Schillebeeckx, A. Brusegan, M and C 2003, April 6-10, Gatlinburg, Tennessee
Investigation of the Neutron Cross Sections on Nb, Mo, Rh and W in the Resonance Energy Range
Yu.V. Grigor’ev, V.Ya Kitaev., B.V. Zhuravlev, V.V. Sinitsa, Zh.V. Mezentseva, H. Fajkov-Stanchik, M. Stempinsky, N.B. Yaneva, G.N. Kim ISINN-11, Dubna, May, 2003, .
High Resolution Cross Section Measyrements at GELINA in Support of the Th-U Fuel Cycle
K. Volev*, A. Borella, A. Brusegan, P. Schillebeeckx, P. Siegler, A. Lukyanov, N. Koyumdjieva, N. Janeva Int. Workshop on P and T and ADS DEVELOPMENT 2003, SCK·CEN, Belgium, October 6-8, 2003
Modeling of Resonance Cross Sections in the Unresolved Energy Region
A. Lukyanov, M. Alami, N. Koyumdjieva, N. JanevaNuclear Physics, Neutron Physics and Nuclear Energy, Proc. of the X Int. School on, Varna, Bulgaria, 172-199, 1991
Perspective Measurements of Neutron Cross Section Data,
N.Janeva, A.Lukyanov, N.Koyumdjieva, SPIRAL2 Workshop, Ganil, France, December ,2004

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