论文标题
观察库仑辅助核定界的$ξ^ - $ - $ - $^{14} $ n系统
Observation of Coulomb-assisted nuclear bound state of $Ξ^-$-$^{14}$N system
论文作者
论文摘要
在J-PARC进行的乳液-counter混合实验中,观察到$ξ^ - $吸收事件,该事件腐烂成双$λ$ hypernuclei。运动计算使反应过程的唯一标识为$ξ ^{ - } + ^{14} $ n $ \ \ \ \ \ \ \ \ \ \ ^{10}_λ$ be + $ ^5_λ$ he。对于$ξ^{ - } $ hyperon的绑定能量,推导了$ 1.27 \ pm 0.21 $ meV的值。 $ξ^ - $的能量水平可能是核$ 1p $状态,表明$ξn$ - $λλ$耦合。
In an emulsion-counter hybrid experiment performed at J-PARC, a $Ξ^-$ absorption event was observed which decayed into twin single-$Λ$ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as $Ξ^{-} + ^{14}$N$\ \rightarrow\ ^{10}_Λ$Be + $^5_Λ$He. For the binding energy of the $Ξ^{-}$ hyperon in the $Ξ^-$-$^{14}$N system a value of $1.27 \pm 0.21$ MeV was deduced. The energy level of $Ξ^-$ is likely a nuclear $1p$ state which indicates a weak $ΞN$-$ΛΛ$ coupling.