First application of Markov chain Monte Carlo-based Bayesian data analysis to the Doppler-shift attenuation method
First application of Markov chain Monte Carlo-based Bayesian data analysis to the Doppler-shift attenuation method
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DOI：
10.1016/j.physletb.2023.137801
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发表时间：
2022-03
影响因子：
4.4
通讯作者：
L.J. Sun;C. Fry;B. Davids;N. Esker;C. Wrede;M. Alcorta;S. Bhattacharjee;M. Bowry;B. A. Brown;T. Budner;R. Caballero-Folch;L. Evitts;M. Friedman;A. Garnsworthy;B. Glassman;G. Hackman;J. Henderson;O. Kirsebom;J. Lighthall;P. Machule;J. Measures;M. Moukaddam;J. Park;C. Pearson;D. P'erez-Loureiro;C. Ruiz;P. Ruotsalainen;J. Smallcombe;J.K. Smith;D. Southall;J. Surbrook;L. Weghorn;M. Williams
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文献类型：
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作者：
L.J. Sun;C. Fry;B. Davids;N. Esker;C. Wrede;M. Alcorta;S. Bhattacharjee;M. Bowry;B. A. Brown;T. Budner;R. Caballero-Folch;L. Evitts;M. Friedman;A. Garnsworthy;B. Glassman;G. Hackman;J. Henderson;O. Kirsebom;J. Lighthall;P. Machule;J. Measures;M. Moukaddam;J. Park;C. Pearson;D. P'erez-Loureiro;C. Ruiz;P. Ruotsalainen;J. Smallcombe;J.K. Smith;D. Southall;J. Surbrook;L. Weghorn;M. Williams
由于30P(p，γ)31 S反应热核率的巨大不确定性限制了我们对经典新星的理解，我们在TRIUMF同位素分离和加速器(ISAC-II)装置上使用多普勒频移寿命(DSL2)装置测量了31个S激发态的寿命。3He(32 S，α)31 S反应占据了S的31个激发态。失激γ射线由三叶草型高纯锗探测器探测到，与硅探测器望远镜探测到的α粒子相符合。我们首次应用基于现代马尔可夫链蒙特卡罗的贝叶斯统计技术对多普勒频移衰减法γ射线数据进行线形分析。我们已经确定了S最低的两个31激发态的寿命。首先得到了四个高能态寿命的实验上限。实验结果与使用五种通用SD壳层哈密顿量的壳模型计算结果进行了比较。γ射线来自天体物理上重要的Jπ=3/2+，2 60-keV 30 P(p，γ)31 S共振，激发能Ex=6390.2(7)keV，也被观测到了，尽管对寿命的强烈限制需要更好的统计。
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 (DSL2) 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 statistical techniques 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 with an excitation energy of E x= 6390.2 (7) keV in 31 S has also been observed, although strong constraints on the lifetime will require better statistics.