Effects of the HMT on Nucleon Collective Flows within BUU Transport Model

Within the framework of a semiclassical Boltzmann-Uehling-Uhlenbeck （BUU） transport model, the high mo- mentum tail （HMT） effects of nucleon momentum distribution in the nucleus on the nucleon collective flows are studied in semieentral Au＋Au collisions. The HMT due to the isospin-dependent short-range correlations causes a smaller value of the collective flows. We find that the HMT effects on the nucleon collective flows are remarkable at beam energy of 300 MeV/nucleon and become weak as the incident beam energy increases. The results indicate that for the collective flow studies at intermediate energies, the HMT of nucleon momentum distribution in nucleus should be taken into account in transport models.

Temperature dependence of the P-hit single event transient pulse width in a three-transistor inverter chain

A comparison of the temperature dependence of the P-hit single event transient （SET） in a two-transistor （2T） inverter with that in a three-transistor （3T） inverter is carried out based on a three-dimensional numerical simulation. Due to the significantly distinct mechanisms of the single event change collection in the 2T and the 3T inverters, the temperature plays different roles in the SET production and propagation. The SET pulse will be significantly broadened in the 2T inverter chain while will be compressed in the 3T inverter chain as temperature increases. The investigation provides a new insight into the SET mitigation under the extreme environment, where both the high temperature and the single event effects should be considered. The 3T inverter layout structure （or similar layout structures） will be a better solution for spaceborne integrated circuit design for extreme environments.

Supernova neutrino detection on earth

In this paper, we first discuss the detection of supernova neutrinos on earth. Then we propose a possible method to acquire information about θ13 smaller than 1.5° by detecting the ratio of the event numbers of different flavor supernova neutrinos. Such an sensitivity cannot yet be achieved by the Daya Bay reactor neutrino experiment.

Study of whole-body occupational radiation exposure in the industrial radiography in Bangladesh

Objective:In order to understand the complete scenario of the effectiveness of radiation protection practice in the workplace,especially in the industrial radiography and also to analyze the trends with other related studies,epidemiological studies and legal purposes,the assessment and register of the effective dose plays a significant role.Therefore,efforts have been given in the assessment of collective effective dose,mean effective dose,prediction of lifetime cancer risk,and contribution of different age group workers in the collective effective dose.Methods:The occupational radiation exposures for 472 workers were investigated in industrial radiography throughout Bangladesh from 2015 to 2018 by using thermoluminescent dosimeter(TLD).By using a Harshaw TLD reader(Model-4500),the effective dose was measured in a quarterly basis throughout the year.Based on the value of personal dose equivalent Hp(10),database was prepared and recorded.Results:The collective effective dose was 36.1,40.7,28.8 and 37.5 man⋅mSv among 105,102,100 and 165 radiation workers in 2015,2016,2017 and 2018,respectively.The maximum effective dose received by radiation workers was 6.0,7.1,6.9 and 19.9 mSv in 2015,2016,2017 and 2018,respectively,which remained within the stipulated dose limits imposed by Nuclear Safety and Radiation Control(NSRC)Rules-1997,Bangladesh and International Commission on Radiological Protection(ICRP-103).Conclusion:This kind of monitoring would help to construct a national database that will be used by the end users to improve their implementation of optimization in occupational radiation protection in industrial radiography.