Ⅱ型超新星爆發(fā)機(jī)制的研究.pdf

1、廣西師范大學(xué)碩士學(xué)位論文Ⅱ型超新星爆發(fā)機(jī)制的研究姓名：丘秀強(qiáng)申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：理論物理指導(dǎo)教師：張妙靜20080401AbstractResearch on the Explosion Mechanism of Type II SupernovaeGraduate student: Xiu-qiang Qiu Advisers: Prof. Miao-jing ZhangSpecialty: Theoretical Physics

2、 Direction: Nucleonics Grade: 2005AbstractIn this paper, physical process in presupernova and prompt explosion mechanism oftype II supernova (SNII) are investigated.The research progress relevant to explosion mechanism i

3、s summarized. Including theevolution of massive stars, the reason of causing collapsing instability in stars . The classifycharacters of SN and the structure of prosupernova are introduced,especially the prosuper-nova gi

4、ven by Woosley after 2000. The main SNII explosion mechanisms and the difficulty inthe theory research are reviewed. The physical factors relevant to SNII explosion numericalsimulation and numerical simulation methods ar

5、e introduced, which include nuclear statis-tical equilibrium(NSE), electron capture (EC),four model state equation, general relativityhydrodynamic method,numerical simulation methods.We make a discussion in detail aboutt

6、he effect of new presupernova on the core collapse, shock propagation , explosion energyand the definition of initial explosion energy.Presupernova and the structure of inner core are very important to supernova explosio

7、n,which sensitivity to the physical parameters given by presupernova, the physical parameterhave a great effect on the condition and the results of supernova explosion.Here we restudythe effect of presupernova on the cor

8、e collapse, shock propagation and explosion energy,usingthe data of presupernova given by Wooley in 2002,and also make a discussion about the defi-nition of initial explosion energy.The results of this paper show that th

9、e collapse time(τ (1) collap)of supernova models,which presupernova are 11M?, 12M?and13M?,is reduced for the changeof initial density.While the collapse time of the model using 15M? presupernova is delay.In addition,the

10、inner density ρc maxand the Ms of the four models are all augmented,whichwill be good to shock propagation. The augmentation of Ms shorten the distance of shockpropagation,and the augmentation of inner density made the r

11、ebound more powerful. Fromthe comparison of the two models ,which presupernova are 11M? and 12M?,we find thatthe augmentation of initial temperature will make the collapse more rapid.In the process ofshock propagation, t

12、he new models run faster first and then become slow ,comparing to themodels of Wang,while the transmission time is appropinquity .Furthermore, the shock energyis augmented for the increase of inner binding energy (?EH b

13、)and the decrease of energy usedfor photodisintegration(Edis) and the decrease of neutrino loss(?Eν).And we use 12 mod-els to discuss the definition of initial shock energy ,found that the definition of E(4) shock and– I