论文标题
马尔可夫链蒙特卡洛的贝叶斯数据分析的首次应用与多普勒换档方法
First application of Markov Chain Monte Carlo-based Bayesian data analysis to the Doppler-Shift Attenuation Method
论文作者
论文摘要
主要是由$^{30} $ p $（p，γ）^{31} $ s反应限制了我们对古典novae的理解的巨大不确定性的动机，我们使用了$^{31} $ s兴奋的状态使用多普勒移位寿命（dsl）设施（dsl）设施（dsl）设施（cackii is actimfii is oftiumfii isopeie anderi iSopere）。 $^{31} $ s激发态由$^{3} $ he $（^{32} $ s $，α）^{31} $ s反应填充。 clover型的高纯晶型探测器与硅探测器望远镜检测到的$α$颗粒相吻合，检测到了去激发$γ$射线。我们已经应用了现代马尔可夫链蒙特卡洛的贝叶斯方法来首次对多普勒换档衰减方法进行线形分析。我们已经确定了两个最低的$^{31} $ s激发状态的寿命。已经获得了四个上林状态的寿命的第一个实验上限。使用五个通用$ SD $ shell Hamiltonians将实验结果与壳模计算进行了比较。 $γ$射线的证据起源于天体重要的$ j^π= 3/2^+$，260-kev $^{30} $ p $（p，γ）^{31} $ s共振，尽管对生命周期的强大约束将需要更好的统计数据。
Motivated primarily by the large uncertainties in the thermonuclear rate of the $^{30}$P$(p,γ)^{31}$S reaction that limit our understanding of classical novae, we carried out lifetime measurements of $^{31}$S excited states using the Doppler Shift Lifetimes (DSL) facility at the TRIUMF Isotope Separator and Accelerator (ISAC-II) facility. The $^{31}$S excited states were populated by the $^{3}$He$(^{32}$S$,α)^{31}$S reaction. The deexcitation $γ$ rays were detected by a clover-type high-purity germanium detector in coincidence with the $α$ particles detected by a silicon detector telescope. We have applied modern Markov chain Monte Carlo-based Bayesian methods to perform lineshape analyses of Doppler-shift attenuation method $γ$-ray data for the first time. We have determined the lifetimes of the two lowest-lying $^{31}$S excited states. First experimental upper limits on the lifetimes of four higher-lying states have been obtained. The experimental results were compared to shell-model calculations using five universal $sd$-shell Hamiltonians. Evidence for $γ$ rays originating from the astrophysically important $J^π=3/2^+$, 260-keV $^{30}$P$(p,γ)^{31}$S resonance has also been observed, although strong constraints on the lifetime will require better statistics.
