Cruz-Torres R, Nguyen D, Hauenstein F, Schmidt A, Li S, Abrams D, Albataineh H, Alsalmi S, Androic D, Aniol K, Armstrong W, Arrington J, Atac H, Averett T, Ayerbe Gayoso C, Bai X, Bane J, Barcus S, Beck A, Bellini V, Benmokhtar F, Bhatt H, Bhetuwal D, Biswas D, Blyth D, Boeglin W, Bulumulla D, Camsonne A, Castellanos J, Chen J-P, Cohen E O, Covrig S, Craycraft K, Dongwi B, Duer M, Duran B, Dutta D, Fuchey E, Gal C, Gautam T N, Gilad S, Gnanvo K, Gogami T, Golak J, Gomez J, Gu C, Habarakada A, Hague T, Hansen O, Hattawy M, Hen O, Higinbotham D W, Hughes E, Hyde C, Ibrahim H, Jian S, Joosten S, Kamada H, Karki A, Karki B, Katramatou A T, Keppel C, Khachatryan M, Khachatryan V, Khanal A, King D, King P, Korover I, Kutz T, Lashley-Colthirst N, Laskaris G, Li W, Liu H, Liyanage N, Markowitz P, McClellan R E, Meekins D, Mey-Tal Beck S, Meziani Z-E, Michaels R, Mihovilovič M, Nelyubin V, Nuruzzaman N, Nycz M, Obrecht R, Olson M, Ou L, Owen V, Pandey B, Pandey V, Papadopoulou A, Park S, Patsyuk M, Paul S, Petratos G G, Piasetzky E, Pomatsalyuk R, Premathilake S, Puckett A J R, Punjabi V, Ransome R, Rashad M N H, Reimer P E, Riordan S, Roche J, Sargsian M, Santiesteban N, Sawatzky B, Segarra E P, Schmookler B, Shahinyan A, Širca S, Skibiński R, Sparveris N, Su T, Suleiman R, Szumila-Vance H, Tadepalli A S, Tang L, Tireman W, Topolnicki K, Tortorici F, Urciuoli G, Weinstein L B, Witała H, Wojtsekhowski B, Wood S, Ye Z H, Ye Z Y, Zhang J
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
University of Education, Hue University, Hue City, Vietnam.
Phys Rev Lett. 2020 May 29;124(21):212501. doi: 10.1103/PhysRevLett.124.212501.
We report the first measurement of the (e,e^{'}p) three-body breakup reaction cross sections in helium-3 (^{3}He) and tritium (^{3}H) at large momentum transfer [⟨Q^{2}⟩≈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≤p_{miss}≤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 ±20%, is observed between data and calculations for the full p_{miss} range for ^{3}H and for 100≤p_{miss}≤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.
我们报告了在大动量转移[⟨Q²⟩≈1.9 (GeV/c)²]和xB>1运动学条件下，对氦-3（³He）和氚（³H）中（e,e'p）三体破裂反应截面的首次测量，在此运动学条件下，截面应能灵敏反映单个核子的准弹性（QE）散射。数据涵盖缺失动量40≤pmiss≤500 MeV/c，在无再散射的QE极限下，该缺失动量等于被探测核子的初始动量。将测量的截面与最先进的从头计算结果进行了比较。对于³H在整个pmiss范围内以及³He在100≤pmiss≤350 MeV/c范围内，数据与计算结果总体上在±20%的范围内达成了良好一致。考虑出射核子再散射的影响后，在pmiss>250 MeV/c时与数据的一致性得到改善，并表明存在电荷交换（SCX）再散射的贡献。³He加³H的同位旋标量和在很大程度上对SCX不敏感，在整个pmiss范围内，计算结果在数据精度范围内对其进行了描述。这验证了直至500 MeV/c的非常高的初始核子动量下的三核子系统基态的当前模型。
