在非常大的内部动量下探测氘核。

Probing the Deuteron at Very Large Internal Momenta.

作者信息

Yero C, Abrams D, Ahmed Z, Ahmidouch A, Aljawrneh B, Alsalmi S, Ambrose R, Armstrong W, Asaturyan A, Assumin-Gyimah K, Ayerbe Gayoso C, Bandari A, Bane J, Basnet S, Berdnikov V V, Bericic J, Bhatt H, Bhetuwal D, Biswas D, Boeglin W U, Bosted P, Brash E, Bukhari M H S, Chen H, Chen J P, Chen M, Christy M E, Covrig S, Craycraft K, Danagoulian S, Day D, Diefenthaler M, Dlamini M, Dunne J, Duran B, Dutta D, Ent R, Evans R, Fenker H, Fomin N, Fuchey E, Gaskell D, Gautam T N, Gonzalez F A, Hansen J O, Hauenstein F, Hernandez A V, Horn T, Huber G M, Jones M K, Joosten S, Kabir M L, Karki A, Keppel C E, Khanal A, King P, Kinney E, Lashley-Colthirst N, Li S, Li W B, Liyanage A H, Mack D J, Malace S P, Matter J, Meekins D, Michaels R, Mkrtchyan A, Mkrtchyan H, Nazeer S J, Nanda S, Niculescu G, Niculescu M, Nguyen D, Nuruzzaman N, Pandey B, Park S, Perdrisat C F, Pooser E, Rehfuss M, Reinhold J, Sawatzky B, Smith G R, Sun A, Szumila-Vance H, Tadevosyan V, Wood S A, Zhang J

机构信息

Florida International University, University Park, Florida 33199, USA.

Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.

出版信息

Phys Rev Lett. 2020 Dec 31;125(26):262501. doi: 10.1103/PhysRevLett.125.262501.

DOI:10.1103/PhysRevLett.125.262501

PMID:33449750

Abstract

We measure ^{2}H(e,e^{'}p)n cross sections at 4-momentum transfers of Q^{2}=4.5±0.5 (GeV/c)^{2} over a range of neutron recoil momenta p_{r}, reaching up to ∼1.0 GeV/c. We obtain data at fixed neutron recoil angles θ_{nq}=35°, 45°, and 75° with respect to the 3-momentum transfer q[over →]. The new data agree well with previous data, which reached p_{r}∼500 MeV/c. At θ_{nq}=35° and 45°, final state interactions, meson exchange currents, and isobar currents are suppressed and the plane wave impulse approximation provides the dominant cross section contribution. We compare the new data to recent theoretical calculations, where we observe a significant discrepancy for recoil momenta p_{r}>700 MeV/c.

摘要

我们在4动量转移 (Q^{2}=4.5\pm0.5\ (GeV/c)^{2}) 下，测量了在一系列中子反冲动量 (p_{r}) 范围内的 (^{2}H(e,e^{'}p)n) 截面，最高可达约 (1.0\ GeV/c)。我们在相对于3动量转移 (\vec{q}) 的固定中子反冲角 (\theta_{nq}=35^{\circ})、(45^{\circ}) 和 (75^{\circ}) 处获得了数据。新数据与之前最高达到 (p_{r}\sim500\ MeV/c) 的数据吻合良好。在 (\theta_{nq}=35^{\circ}) 和 (45^{\circ}) 时，末态相互作用、介子交换流和同位旋流受到抑制，平面波冲量近似提供了主要的截面贡献。我们将新数据与最近的理论计算进行了比较，发现在反冲动量 (p_{r}>700\ MeV/c) 时存在显著差异。