标题： $^{8}$He 和$^{10}$He 谱在$(t$,$p)$反应中被研究 显示英文标题

标题： The $^{8}$He and $^{10}$He spectra studied in the $(t$,$p)$ reaction

摘要： 低能谱的$^8$He 和$^{10}$He 核在$^3$H($^6$He,$p$)$^8$He 和$^3$H($^8$He,$p$)$^{10}$He 转移反应中被研究。 该 $0^+$ 基态（g.s.） 的 $^8$He 和激发态， $2^+$ 在 $3.6-3.9$ MeV 和 $(1^+)$ 在 $5.3-5.5$ MeV，分别以 200， 100-250 和 90-125 $\mu$b/sr 的截面被激发。 一些关于$^8$激发态在约7.5 MeV的证据被获得。 我们讨论了在$^8$He中2.14 MeV以上的近阈值异常可能的性质，并将其与一个$1^-$连续谱（软偶极激发）的填充相关联，该连续谱在约3 MeV处达到峰值。 在$^{10}$He谱中观察到最低能量事件组，在$\sim 3$MeV处，其截面为$\sim 140$ $\mu$ b/sr。 我们认为这个结果可能与之前报道的$^{10}$He 的观察结果一致，从而为$^{10}$He 在约 3 MeV 处提供了新的基态位置。 显示英文摘要

摘要： The low-lying spectra of $^8$He and $^{10}$He nuclei were studied in the $^3$H($^6$He,$p$)$^8$He and $^3$H($^8$He,$p$)$^{10}$He transfer reactions. The $0^+$ ground state (g.s.) of $^8$He and excited states, $2^+$ at $3.6-3.9$ MeV and $(1^+)$ at $5.3-5.5$ MeV, were populated with cross sections of 200, 100-250, and 90-125 $\mu$b/sr, respectively. Some evidence for $^8$He state at about 7.5 MeV is obtained. We discuss a possible nature of the near-threshold anomaly above 2.14 MeV in $^8$He and relate it to the population of a $1^-$ continuum (soft dipole excitation) with peak value at about 3 MeV. The lowest energy group of events in the $^{10}$He spectrum was observed at $\sim 3$ MeV with a cross section of $\sim 140$ $\mu$b/sr. We argue that this result is possibly consistent with the previously reported observation of $^{10}$He, in that case providing a new g.s. position for $^{10}$He at about 3 MeV.