Research List

No.	Researcher	Title	Abstract	Year
1591	Win Mar	INVESTIGATION ON SHIELDING PROPERTIES OF SOME COMPOSITE MATERIALS BY USING NAI(Tl) DETECTOR	The high-density composite materials have similar behavior of heavy metals when increasing the proportion of material supported in composite material. In other word measure and determination for the amount of shielding required to provide personal protection on an environment with lowest costs and appropriate selecting materials to reduce radiation doses in industrial facilities and surrounding areas. In this research, the numerical buildup factor and the linear attenuation coefficient were accounted as a function for the concentration of cement in shields with 25%, 50% and 75% of iron powder. The shield thickness of shielding composite materials that supported by these concentrations of iron in cement powders in the range of (5-40) mm was done. From the results, it is found that the better attenuation coefficient become in its each composite sample, the more iron concentration increased in cement. In this research, it is cleared that the most iron concentration in cement is the best shielding ability.	2021
1592	Chan Myae Aung	OBSERVATION OF A SINGLE-STRANGENESS HYPERNUCLEUS EVENT IN KEK-PS E 373 EXPERIMNT	A single-? hypernucleus event is kinematically analyzed in this research paper. The analyzed event was observed in KEK-PS E373 experiment. In this research work, a single-? hypernucleus was produced by the direct process of hypernuclei studies. From the experimental studies, ranges of tracks #1, #2, #3, #4 and #5 are 40.10 ? 0.30 ?m, 414.93 ? 0.48 ?m, 9.11 ? 0.03 ?m, 9.47 ? 0.15 ?m and 10800.90 ? 0.00 ?m. By using these ranges, Q-value, total kinetic energy, reconstructed mass and mass difference are calculated. We checked conservation laws so that 167 decay modes are obtained. All negative Q-values are neglected as the first step of our analysis. Furthermore, comparison of Q-value and visible energy released are performed and then mass of single-? hypernucleus is calculated. Finally, we have obtained 13 decay modes. According to our calculated results, only two decay modes, Li ? p+ He+ p + ? 4 - 2 6 ? and Li ? p + p+ He + ? 4 - 2 6 ? are possible with the same single-strangeness hypernucleus. Due to the percentage of mass difference, Li ? p + p+ He + ? 4 - 2 6 ? is more acceptable between the most possible two decay modes. Qvalue and total kinetic energy or visible energy released of Li 6 ? are 35.27 ? 0.00 MeV and 35.25 ? 0.06 MeV. The mass difference of the single-? hypernucleus is 0.019 MeV/c2 . According to our calculating results, a single-? hypernucleus was identified as a Li 6 ? hypernucleus.	2021
1593	Nyi Nyi Soe	CALCULATION OF THE RANGES AND POSITION ANGLES OF SINGLE-? HYPERNUCLEUS EVENT IN NUCLEAR EMULSION	In this research work, the ranges and position angles of charged particle tracks which are emitted from a single-? hypernucleus event in KEK-PS E373 experiment. The positions (x, y, z) of a single- ? hypernucleus event are measured in nuclear emulsion. In the analyzed event, the ? - hyperon is stopped and decays into charged particles tracks #1 and #2 which has 4.27?0.001?m range. The charged particle track #1 is a single-? hypernucleus according to its decay topology (#1 ? #3 + #4). The ranges of charged particles tracks #1,#2, #3 and #4 are 24.7527�0.00047 ?m, 4.2698�0.000?m, 11.9915�0.00083, and 1486.8012�0.1358 ?m. The measurement of position angles (? and ?) of charged particles is the main work for particles identification as well as that of ranges. The position angles of charged particles tracks #1, #2, #3 and #4 are 147.1130�0.4830, 159.5224�0.2149?, 101.17061�0.3360? and 73.1808�1.7845? for the zenith angle (?) and 2.4819�0.2775?, -31.0295�0.4417?, 53.10747�0.6409? and 57.1516�2.7838? for the azimuthal angle (?).	2021
1594	Htaik Nandar Kyaw	FORMATION OF N 15 ? HYPERNUCLEUS IN J-PARC E07 EXPERIMENT	In this research, a single-? hypernucleus which is detected in J-PARC E07 nuclear emulsion experiment is analyzed by relativistic kinematics. The ranges and position angles of charged particle tracks are measured in nuclear emulsion. Neutral particle emission in the decay products is checked by calculating the dot product of direction vector of hyperfragment and total momentum of decay products. The possible decay modes of single-? hypernucleus are considered and Q-values are calculated. Total energies of each decay product are obtained by range-energy relation and momentum conservation. The acceptable decay modes are chosen by comparing Q-values and total energy. Then, mass of possible hypernuclei is calculated by mass-energy relation. According to our analysis, a single-? hypernucleus is uniquely identified as N 15 ? which follows the N Be He d n 3 2 9 4 15 ? ? ? ? ? decay mode with the mass 14141.58?0.19 MeV/c2 and binding energy 14.31?0.19 MeV.	2021
1595	Khaing Pwint Wai	INVESTIGATION OF TRIAXIALITY IN MEDIUM-MASS GERMANIUM ISOTOPES	The shape evolution for some selected germanium isotopes have been investigated from calculated potential energy surfaces on beta-gamma ?? ? ? ? plane and analyzed by the single-particle energy levels. The Ev8 program with a 3-dimensional Cartesian mesh which solves the Skyrme-HartreeFock+BCS problem is employed. From the ?? ? ? ? plane, these results are pointed out that 64Ge is to be triaxial while both 68Ge (oblate) and 78Ge (prolate) have axially symmetric whereas 82Ge gives the spherical nature. The calculated binding energies of all selected nuclei in this work fairly agree with experimental data.	2021
1596	Aye Aye Maw	MEASUREMENTS OF IODINE CONTENTS IN SEAWEED (KALAMOAT SEIGH) (CATENELLA SP) FROM VARIOUS PLACES IN MON STATE	The purpose of this research work was to study the amount of iodine contents and intermolecular bond structure of seaweed from three locations (Waegali, Haigyii and Kyaikkhami) in Mon State. These samples were analysed by using Energy Dispersive X-Ray Fluorescence (EDXRF) and Fourier Transform Infra-Red (FTIR) techniques. From the EDXRF measurement, the result showed that iodine contents of seaweed from three locations (Waegali, Haigyii and Kyaikkhami) were 17.81%, 15.79% and 18.50% respectively. It was found that the iodine isotope as in treatment of diagnosis and diseases of the thyroid gland or thyroid cancers.	2021
1597	Ei Ei San	INVESTIGATION OF THE RADON GAS CONCENTRATION INSIDE HEINDA TIN MINE IN DAWEI TOWNSHIP, TANINTHARYI DIVISION, MYANMAR	This investigation aims to report the radon gas concentration inside of the Heinda Tin Mine in Dawei Township, Tanintharyi Division of Myanmar. In this research, the determinations of the radon gas concentration have been carried out in soil samples of some places inside Heinda Tin Mine. Soil samples were collected from four different parts inside of the Mine. RAD 7 detector was used to obtain the results. The experimental results were compared with the recommended values of ICRP and EPA. And then, a precious massage concerned with the radon gas hazard could be given to the public for health.	2021
1598	Khin Than Tint	ESTIMATION OF BINDING ENERGY OF XI-MINUS HYPERON IN A NUCLEUS FROM SINGLE-? HYPERNUCLEUS EVENT	The binding energy of Xi-minus (?- ) hyperon in nitrogen nucleus was estimated from single-? hypernucleus event which was detected in nuclear emulsion of J-ARC E07 experiment. The type of hypernucleus, its production and decay mode were obtained based on the conservation laws of energy and momentum. Moreover, the estimated value of the binding energy of ?- hyperon in nitrogen nucleus was 0.51 � 0.17 MeV.	2021
1599	Hein Nay Zar Wann	MEASUREMENT OF RADON CONCENTRATION IN SOIL GAS USING RAD7 FROM BYUT MYAUNG AND KALAIN GOLD MINES AT BAGO REGION	Soil gas Radon, 222Rn, concentrations were measured in Buyt Myaung and Kalain gold mines of Shwe Kyin Township at Bago region. The soil samples were tested by using RAD7 radon technique detector. In each location of four different depths were taken for soil gas measurements, starting from the ground surface. It was found that the largest radon concentration was 29.5 �1.37 Bqm3 at 6ft depth and smallest radon concentration was 11.2 � 0.91 Bqm-3at 12ft depth from Byut Myaung gold mine. The largest radon concentration was 25.7 � 1.49 Bqm-3 at 6 ft depth and the smallest radon concentration was 10.9 � 0.68 Bqm-3 at 12 ft depth from Kalain gold mine. All the mentions were taken by using International Commission on Radiological Protection (ICRP) method for under or over safety concentration level that effects on human inspiration system especially lung's tissue. The results obtained from this study are not dangerous for that region.	2021
1600	Shwe Sin Oo	RELATIVISTIC AND NON-RELATIVISTIC MOMENTUM SPACE WAVEFUNCTIONS FOR CHARMONIUM AND BOTTOMONIUM STATES	In the constituent quark model, charmonium and bottomonium are considered to be the bound states of charm/anti-charm and bottom/antibottom quarks. We use the linear potential to represent the long distance confining part of the potential and a Coulomb like potential to represent the short distance one-gluon exchange part of the potential. In order to study the general features of the wave functions, it is not necessary to include spin dependent parts in the potential. Using the above mentioned potentials, we solved the Schrodinger equation with non-relativistic kinematics and also with relativistic kinematics. We solve these equations by expanding the momentum space wavefunction in a complete set of orthonormal basis functions and turning the Schrodinger equation into a standard matrix eigen-value equation. We vary the masses of the quarks, and the strengths of the potentials until we get a satisfactory fit to the spin averaged mass spectra of the desired ??? system. The eigenvectors gives the coefficients of the linear combination in the wavefunction expansion from which we can construct the wavefunctions. We compare the non- relativistic and relativistic wavefunctions for each state in ??? and ??? systems.	2021

Research Publications

Myanmar Academy of Art & Science List of Research