2 AGeV ~ 6 Li射弹撞击碳靶产物的超核谱学
Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2 AGeV
摘要：
为了验证重离子束超核谱学的可行性，进行了一项新的实验。利用不变质量方法，对2AGeV ~ 6Li射弹轰击碳靶的超核产物进行了谱学研究。在p+π^-、3 He +π^-和4 He +π^-末态分别观察到了Λ-超子、3ΛH和4ΛH超核的信号，其显著性分别为6.7、4.7和4.9σ。通过对二次顶点分布的极大似然拟合，得到了它们的寿命值：对于Λ，$262 ^{+56}_{-43} \pm 45$ ps;对于3ΛH，$183 ^{+42}_{-32} \pm 37$ ps;对于4ΛH，$140 ^{+48}_{-33}\pm 35 $ ps.
英文摘要：
A novel experiment, aiming at demonstrating the feasibility of hypernuclear spectroscopy with heavy-ion beams, was conducted. Using the invariant mass method, the spectroscopy of hypernuclear products of 6Li projectiles on a carbon target at 2 AGeV was performed. Signals of the Λ-hyperon and 3ΛH and 4ΛH hypernuclei were observed for final states of p+π^-, 3He+π^- and 4He+π^-, respectively, with significance values of 6.7, 4.7 and 4.9σ. By analyzing the proper decay time from secondary vertex distribution with the unbinned maximum likelihood fitting method, their lifetime values were deduced to be $262 ^{+56}_{-43} \pm 45$ ps for Λ, $183 ^{+42}_{-32} \pm 37$ ps for 3ΛH, and $140 ^{+48}_{-33}\pm 35 $ ps for 4ΛH.
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