论文标题
通过3H和3HE(E,E'P)PN横截面测量值探测少量的核动力学
Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements
论文作者
论文摘要
We report the first measurement of the \eep three-body breakup reaction cross sections in helium-3 ($^3$He) and tritium ($^3$H) at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV/c)$^2$) and $x_B>1$ kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single核子。数据盖缺少$ 40 \ le p_ {miss} \ le 500 $ meV/c,在没有撤销的情况下,在QE限制中等同于探测核子的初始动量。将测得的横截面与最新的AB-Initio计算进行了比较。在$ \ pm20 \%$之内的总体良好协议可以在数据和计算之间观察到$^3 $ h的完整$ p_ {miss} $ rangage,$^3 $ h,$ 100 \ le p_ {miss} \ le 350 $ meV/c/c for $^3 $ he。包括脱落核子的脱落效果改善了与$ p_ {miss}> 250 $ meV/c的数据的一致性,并提出了Charge-Exchange(SCX)删除的贡献。 $^3 $ he plus $^3 $ h的等iSoscalar和对SCX不敏感的$^3 $ h,通过计算在整个$ p_ {miss} $范围内的数据准确性中描述。这将三核系统系统的基态验证到最高的初始核子动量$ 500 $ MEV/c。
We report the first measurement of the \eep three-body breakup reaction cross sections in helium-3 ($^3$He) and tritium ($^3$H) at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV/c)$^2$) and $x_B>1$ kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta $40 \le p_{miss} \le 500$ MeV/c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with state-of-the-art ab-initio calculations. Overall good agreement, within $\pm20\%$, is observed between data and calculations for the full $p_{miss}$ range for $^3$H and for $100 \le p_{miss} \le 350$ MeV/c for $^3$He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at $p_{miss} > 250$ MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of $^3$He plus $^3$H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire $p_{miss}$ range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of $500$ MeV/c.