论文标题
通过弱，低能量，$β$ - 删除的质子衰减$^{31} $^{31} $ cl，限制$^{30} $ p（$ p，γ）^{31} $ s反应率
Constraining the $^{30}$P($p,γ)^{31}$S reaction rate in ONe novae via the weak, low-energy, $β$-delayed proton decay of $^{31}$Cl
论文作者
论文摘要
$^{30} $ p $（p，γ）^{31} $ s反应在理解$ a \ geq 30 $ novae中的核素的核合成中起着重要作用。带有锗标记的气态检测器用于测量$^{31} $ cl $β$ - 删除的质子衰减，这是通过密钥$ j^π= 3/2^{+} $，260-keV共鸣。强度$ i^{260} _ {βp} = 8.3^{+1.2} _ { - 0.9} \ times 10^{ - 6} $代表最弱的$β$ delayed，带电的预付款，在400 keV以下测量，导致蛋白质分支，导致proton分支的$γ___p / $γ_p / g.p / g。 2.5^{+0.4} _ { - 0.3} \ times 10^{ - 4} $。通过将此测量与$γ_γ$的外壳模型计算相结合，并且过去在其他共振上工作，总$^{30} $ p $（p，γ）^{31} $ s速率已通过降低的不确定性确定。新速率已在流体动力模拟中用于建模Nova弹射的组成，从而导致$^{30} $ si/$^{28} $ si $ si的具体预测在Presolar Nova晶粒中的过量和核温度计的校准。
The $^{30}$P$(p,γ)^{31}$S reaction plays an important role in understanding nucleosynthesis of $A\geq 30$ nuclides in oxygen-neon novae. The Gaseous Detector with Germanium Tagging was used to measure $^{31}$Cl $β$-delayed proton decay through the key $J^π=3/2^{+}$, 260-keV resonance. The intensity $I^{260}_{βp} = 8.3^{+1.2}_{-0.9} \times 10^{-6}$ represents the weakest $β$-delayed, charged-particle emission ever measured below 400 keV, resulting in a proton branching ratio of $Γ_p / Γ= 2.5^{+0.4}_{-0.3} \times 10^{-4}$. By combining this measurement with shell-model calculations for $Γ_γ$ and past work on other resonances, the total $^{30}$P$(p,γ)^{31}$S rate has been determined with reduced uncertainty. The new rate has been used in hydrodynamic simulations to model the composition of nova ejecta, leading to a concrete prediction of $^{30}$Si/$^{28}$Si excesses in presolar nova grains and the calibration of nuclear thermometers.
