G. Khuukhenkhuu

G. Khuukhenkhuu
National University of Mongolia | NUM · Nuclear Research Center, Nuclear Data Division

PhD

About

112
Publications
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357
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Publications

Publications (112)
Article
Accurate cross section of the 232Th(n, f) reaction are demanded in the design of advanced nuclear systems and in the development of fission theory. However, the existing measurement data are relatively sparse comparing with those of the 238U(n, f) reaction, with big uncertainties and obvious discrepancies. Furthermore, analysis shows that systemati...
Article
Cross sections of the 58,60,61 Ni( n , α ) 55,57,58 Fe reactions were measured at 8.50, 9.50 and 10.50 MeV neutron energies based on the HI-13 tandem accelerator of China Institute of Atomic Energy (CIAE) with enriched ⁵⁸ Ni, ⁶⁰ Ni, and ⁶¹ Ni foil samples with backings. A twin gridded ionization chamber (GIC) was used as the charged particle detect...
Article
Cross sections for the 35Cl(n,α)32P reaction were systematically measured at incident neutron energies in the range of 3.3 to 5.3 MeV. The experiment was carried out on the Van de Graaff accelerator EG-5 at the Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Russia. Fast neutrons were produced in the reaction 2H(d,n)3He....
Article
Cross sections for the Cl35(n,α)P32 reaction were systematically measured at incident neutron energies in the range of 3.3 to 5.3 MeV. The experiment was carried out on the Van de Graaff accelerator EG-5 at the Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Russia. Fast neutrons were produced in the reaction H2(d,n)3He....
Article
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The systematical analysis of alpha-active nuclides is useful for both the nuclear technology applications and understanding of nuclear structure study. Geiger-Nuttall law, which describes a dependence of the disintegration constant on the range of α -particles, was deduced from the Gamow theory explaining the passage of the α -particles through the...
Article
The cross sections at 5 energy points of the 58Ni(n, α)55Fe reaction were measured in the 4.50 MeV ≤ En ≤ 5.50 MeV region while those for the 60Ni(n, α)57Fe and 61Ni(n, α)58Fe reactions were measured at En = 5.00 and 5.50 MeV using the 4.5 MV Van de Graaff accelerator at Peking University. A gridded twin ionization chamber (GIC) was used as the det...
Article
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We present our recent results of the mirror nuclei ⁵ He and ⁵ Li obtained by analyzing structure of continuum states in the complex scaled α + N two-body model. Decomposed scattering cross section and continuum level density of α + N system are discussed.
Article
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In the past two decades cooperating with Frank Laboratory of Neutron Physics (FLNP), Joint Institute for Nuclear Research (JINR) measurements of (n, α ) reaction cross sections for ⁶ Li, ¹⁰ B, ²⁵ Mg, ³⁹ K, ⁴⁰ Ca, 54,56,57 Fe, ⁵⁸ Ni, ⁶³ Cu, 64,67 Zn, ⁹⁵ Mo, ¹⁴³ Nd and 147,149 Sm nuclei were performed in the MeV neutron energy region based on the 4.5...
Article
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In this work we suggest some methods based on the statistical and knock-on models, for evaluation of the α -clustering factor or α -clustering probability in ( n, α ) reactions induced by slow and fast neutrons. The main purpose of this study is to compare the values of the α -clustering factors obtained by the compound and direct mechanisms for th...
Article
The cross sections of the ¹⁰B(n,\(\alpha\))⁷Li two-body and ¹⁰B(n, t2\(\alpha\)) three-body reactions have been measured at \( E_{n} =4.0\), 4.5 and 5.0 MeV using a GIC (twin gridded ionization chamber) and an enriched thin-film ¹⁰B sample in 2017. The anode and grid signals of the GIC are used in the experiment. However, we found afterwards that b...
Article
Full-text available
Preliminary results of measurements of the total reaction cross sections σ R for nuclei ⁴ He, ⁶ He, ⁸ He, ⁷ Li, ⁸ Li, ⁹ Li, ¹ Li, ¹¹ Be, ⁹ Be, ¹⁰ Be, ¹¹ Be, ¹² Be, ⁸ B, ¹⁰ B, ¹¹ B and ¹² B nuclei at energy range (10-50) A MeV with ²⁸ Si target is presented. The secondary beams of light nuclei were produced by bombardment of the ¹⁵ N (50 A MeV) prim...
Article
Fe56,54(n,α)Cr53,51 cross sections were measured in the neutron energy region of 5–11 MeV using three neutron sources based on accelerators, a twin gridded ionization chamber, and highly enriched Fe56 and Fe54 foil samples. The U238(n,f) reaction was used to monitor the neutron fluence, and the interferences from the low-energy neutrons were correc...
Article
Cross sections of the Mg25(n,α)Ne22 and the Mg25(n,α0)Ne22 reactions were measured at five neutron energy points in the 4.0–6.0 MeV region. Highly enriched (98.6%) MgO25 samples were prepared. A twin-gridded ionization chamber was used as the charged particle detector and the U238(n,f) reaction was utilized to calibrate the absolute neutron fluence...
Article
Full-text available
Preliminary results of measurements of the total reaction cross sections σR and neutron removal cross section σ-xn for weakly bound ⁶He, ⁸Li, ⁹Be and ¹⁰Be nuclei at energy range (20-35) A MeV with ²⁸Si target is presented. The secondary beams of light nuclei were produced by bombardment of the ²²Ne (35 A MeV) primary beam on Be target and separated...
Article
Cross sections of the B10(n,t2α) three-body reaction were measured at En=4.0,4.5, and 5.0 MeV using a twin gridded ionization chamber and a thin-film B10 sample. The present paper is the first part of the work. The experimental spectrum of the B10(n,t2α) reaction measured by the gridded ionization chamber (GIC) was predicted. The B10(n,t2α) reactio...
Article
Cross sections of the B10(n,t2α) three-body reaction were measured at En=4.0, 4.5, and 5.0 MeV using a twin gridded ionization chamber and a thin-film B10 sample. The present paper is the second part of the work. A digital data-acquisition system was developed for the gridded ionization chamber based on the waveform digitizer. A thin-film B10 sampl...
Article
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In association with the property of the 1/2+ state observed just above the Be8(0+)+n threshold energy in Be9, we investigate the photodisintegration cross section of an s state in a simple schematic two-body model using the complex scaling method. The photodisintegration cross section, continuum level density, scattering phase shifts, and scatterin...
Article
Full-text available
In association with the property of the 1/2⁺ state observed just above the ⁸Be(0⁺)+n threshold energy in ⁹Be, we investigate the photo-disintegration cross section of an s-state in a schematic two-body system using the complex scaling method.
Article
Full-text available
We discuss the problems of scattering in this framework, and show that the applied method is very useful in the investigation of the effect of the resonance in the observed scattering cross sections. In the present study, not only the scattering cross sections but also the decomposition of the scattering cross sections was computed for the system....
Article
Full-text available
Cross sections of the 144Sm(n,α)141Nd and 66Zn(n,α)63Ni reactions were measured at En = 4.0, 5.0 and 6.0 MeV performed at the 4.5-MV Van de Graaff Accelerator of Peking University, China. A double-section gridded ionization chamber was used to detect the alpha particles. The foil samples of 144Sm2O3 and enriched 66Zn were placed at the common catho...
Article
Preliminary results of measurements of the total reaction cross sections σR for weakly-bound 6,8He and 8,9Li nuclei at energy range (25–45)/A MeV on 27Al and 208Pb targets are presented. The secondary beams of 6,8He and 8,9Li were produced by bombardment of the 11B (33 A MeV) primary beam on Be (89 mg cm–2) target and separated by COMBAS fragment-s...
Article
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The statistical model based on the Weisskopf-Ewing theory and constant nuclear temperature approximation is used for systematical analysis of the 4.0-6.5 MeV neutron induced (n, α) reaction cross sections. The α-clusterization effect was considered in the (n, α) cross sections. A certain dependence of the (n, α) cross sections on the relative neutr...
Article
Cross sections of the Fe56(n,α)Cr53 and Fe54(n,α)Cr51 reactions were measured at En=5.5and6.5MeV and En=4.0,4.5,5.5,and6.5MeV, respectively, using a double-section gridded ionization chamber as the α-particle detector. Natural iron and enriched Fe56 and Fe54 foil samples were prepared. A deuterium gas target was used to produce monoenergetic neutro...
Article
The scattering phase shifts are studied by using the complex scaling method. The real-range and complex-range Gaussian basis functions are utilized for the investigation of the low-lying excited states of 5He.
Conference Paper
The total nuclear reaction cross sections (σR) measurements have long been of interest since they tell us about the radii and transparency of these nuclei and give clues to understanding of their structure. For studies of unstable nuclei, in particular the physical properties of halo nuclei and the neutron skin thickness, it is valuable to know not...
Article
Differential cross sections for the 40Ca(n, α0), (n, α1,2) and (n, α3,4,5) reactions are measured at neutron energies of 4.0, 4.5, 5.0, 5.5, 6.0 and 6.5MeV using a double-section gridded ionization chamber and two CaF2 samples. Monoenergetic neutrons were produced through the 2H(d, n)3He reaction with a deuterium gas target. A BF3 neutron counter w...
Article
Full-text available
Cross sections of the 57Fe(n,α)54Cr reaction are measured for the first time, and those of the 63Cu(n,α)60Co reaction are measured in the megaelectron volt region by the direct experimental method. Experiments were performed at the 4.5-MV Van de Graaff Accelerator of Peking University. Monoenergetic neutrons (5.0, 5.5, 6.0, and 6.5 MeV) were produc...
Conference Paper
Full-text available
Cross sections of the 57Fe(n,)54Cr reaction are measured for the first time at neutron energies of 5.0, 5.5, 6.0 and 6.5 MeV using a double-section gridded ionization chamber and\two back-to-back 57Fe samples. Experiments were performed at the 4.5 MV Van de Graaff Accelerator of Peking University. Monoenergetic neutrons were produced through the 2...
Article
Full-text available
We have measured the (149)Sm(n,α)(146)Nd cross section at 4.5, 5.0, 5.5, 6.0, and 6.5 MeV. Measurements were performed at the 4.5 MV Van de Graaff accelerator of Peking University with monoenergetic neutrons produced via the (2)H(d,n)(3)He reaction using a deuterium gas target. Alpha particles were detected with a double-section gridded ionization...
Article
Full-text available
Cross sections and forward/backward ratios in the laboratory reference system were measured for 143Nd(n, α) 140Ce at 4.0, 5.0, and 6.0 MeV, 147Sm(n, α) 144Nd at 5.0 and 6.0 MeV, and 149Sm(n,α) 146Nd at 6.0 MeV. A twin gridded ionization chamber and large-area back-to-back 143Nd 2O 3 and 147,149Sm 2O 3 samples were employed. Experiments were perform...
Article
Full-text available
Nuclear reactions of 64Zn(n,α) 61Ni and 67Zn(n,α) 64Ni are important because they are gas production reactions and zinc is a reactor constituent element with a significant fraction. But the cross section data of these reactions are scanty because the residual nuclei 61Ni and 64Ni are stable and the commonly used activation method is not feasible. I...
Article
Full-text available
Investigation of charged particle emission reaction cross sections for fast neutrons is important to both nuclear reactor technology and the understanding of nuclear reaction mechanisms. In particular, the study of (n,p) cross sections is necessary to estimate radiation damage due to hydrogen production, nuclear heating and transmutations in the st...
Article
Full-text available
Experimental cross section data of the 67Zn(n,α)64Ni reaction are very scanty because the residual nucleus 64Ni is stable and the commonly used activation method is not feasible. As a result, very large deviations (about 10 times) exist among different nuclear data libraries. In the present work, cross sections of the partial 67Zn(n,α0)64Ni and tot...
Article
Full-text available
We have measured the 149Sm(n,α)146Nd cross section at 6.0 MeV to be 0.12±0.018 mb. This is the first reported result for this cross section in the MeV region and so should be helpful for constraining nuclear data evaluations (which differ by a factor of 40 for this reaction at this energy) and for testing and improving nuclear models. The experimen...
Conference Paper
Full-text available
Nuclear reactions of 64Zn(n,α)61Ni and 67Zn(n,α)64Ni are important because they are gas production reactions and zinc is a reactor constituent element with a significant fraction. The isotopic abundances of the 64Zn and 67Zn isotopes are 48.6% and 4.1%, respectively. But the experimental cross section data of these reactions are very scanty because...
Article
Up to now, no experimental cross-section data exist for the 67Zn (n,\( \alpha\)) 64Ni reaction in the MeV neutron energy region. In the present work, the cross-section of the 67Zn (n,\( \alpha\)) 64Ni reaction was measured at E n = 6.0 MeV. Experiments were performed at the Van de Graaff accelerator of Peking University, China. Fast neutrons were p...
Article
Full-text available
Measurements of cross sections of the 95 Mo(n, α) 92 Zr reaction at E n =4.0, 5.0 and 6.0MeV were carried out at the 4.5MV Van de Graaff of Peking University, China. A twin gridded ionization chamber and two large-area 95 Mo samples were adopted. Fast neutrons were produced through the D(d, n) 3 He reaction by using a deuterium gas target. A small...
Article
Full-text available
Up to now, no experimental cross-section data exist for the 67Zn (n, alpha) 64Ni reaction in the MeV neutron energy region. In the present work, the cross-section of the 67Zn (n, alpha) 64Ni reaction was measured at E n = 6.0 MeV. Experiments were performed at the Van de Graaff accelerator of Peking University, China. Fast neutrons were produced th...
Article
Full-text available
Cross sections and forward/backward ratios in the laboratory reference system were measured for the 143Nd(n,α)140Ce reaction at 4.0, 5.0, and 6.0 MeV and for the 147Sm(n,α)144Nd reaction at 5.0 and 6.0 MeV. A twin-gridded ionization chamber and large-area back-to-back 143Nd2O3 samples and 147Sm2O3 samples were employed. Experiments were performed a...
Article
Measurements of cross sections of the (95)Mo(n, alpha)(92)Zr reaction at E(n)=4.0, 5.0 and 6.0MeV were carried out at the 4.5MV Van de Graaff of Peking University, China. A twin gridded ionization chamber and two large-area (95)Mo samples were adopted. Fast neutrons were produced through the D(d, n)(3)He reaction by using a deuterium gas target. A...
Conference Paper
Full-text available
For the 95Mo(n, α)92Zr reaction cross section, there is only one experimental datum in the MeV neutron energy region with large uncertainty. As a result, very large deviations exist in different evaluated nuclear data libraries. This paper report the measurement of cross sections of the 95Mo(n, α)92Zr reaction at En = 4.0, 5.0 and 6.0 MeV. Experime...
Conference Paper
Full-text available
Cross sections and forward/backward ratios for the 143Nd(n,α)140Ce reaction were measured at En = 4.0, 5.0 and 6.0 MeV using a twin-gridded ionization chamber and two large area back-to-back 143Nd2O3 samples. Experiments were performed at the 4.5 MV Van de Graaff of Peking University, China. Fast neutrons were produced through the D(d,n)3He reactio...
Article
In this work, we will show the study of natural background radiation level around the Gurvanbulag (GB) uranium deposit area in the eastern part of Mongolia. We collected environmental soil samples from 102 points around GB Uranium deposit. Collected samples were measured by HPGe gamma spectrometer at Nuclear Research Center, National University of...
Article
Full-text available
The specific radioactivity of {sup 238}U, {sup 232}Th, {sup 40}K were measured in soil samples around some provinces of Central region in Mongolia using the HP-Ge gamma-spectrometer. The effective equivalent dose was determined.
Article
For systematical analysis of known experimental (n,p) cross sections for fast neutrons of En = 6-20 MeV are used the statistical model, exciton model and PWBA based on the compound, pre-equilibrium and direct reaction mechanisms, respectively.
Article
The yields and reaction cross-sections of {sup 92}Sr, {sup 97}Zr, {sup 97}Nb and {sup 135}I at the photofission of {sup 238}U were measured. These fission-fragments have some peculiarities in nuclear structure or in practical using. The measurements were performed on the bremsstrahlung of FLNR JINR microtron, in the electron energy range 10-22 MeV....
Article
Full-text available
Cross sections of the 147 Sm(n, α) 144 Nd reaction were measured at En=5.0 and 6.0MeV. A twin gridded ionization chamber was used as a charged particle detector and two large area 147 Sm 2 O 3 samples placed back to back were employed. Experiments were performed at the 4.5MV Van de Graaff accelerator of Peking University. Neutrons were produced thr...