Pion-less Effective Field Theory on Low-Energy Deuteron Electro-Disintegration
Stefan Christlmeier, Harald W. Griesshammer
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30 pages LaTeX2e, including 10 figures as 34 .eps files embedded with includegraphicx. Increased figure sizes; contents identical to version approved for publication in Phys Rev C -- spelling and grammatical differences
In view of its relation to Big-Bang Nucleo-Synthesis and a reported discrepancy between nuclear models and data taken at S-DALINAC, electro-induced deuteron break-up 2H(e,e' p)n is studied at momentum transfer q<100MeV and close to threshold in the low-energy nuclear Effective Field Theory without dynamical pions. The result at N2LO for electric dipole currents and at NLO for magnetic ones converges order-by-order better than quantitatively predicted and contains no free parameter. It is at this order determined by simple, well-known observables. Decomposing the doubly differential cross-section into the longitudinal-plus-transverse (L+T), transverse-transverse (TT) and longitudinal-transverse interference (LT) terms, we find excellent agreement with a potential-model calculation by Arenh"ovel et al using the Bonn potential. Theory and data also agree well on σ_{L+T}. There is however no space on the theory-side for the discrepancy of up to 30%, 3-σbetween theory and experiment in σ_{LT}. From universality, we conclude that no theoretical approach with the correct deuteron asymptotic wave-function can explain the data. Un-determined short-distance contributions that could affect σ_{LT} enter only at high orders, i.e. at the few-percent level. We notice some issues with the kinematics and normalisation of the data reported.
Neutron-proton radiative capture, photo-magnetic and anti-neutrino disintegration of the deuteron in the relativistic field theory model of the deuteron
在相对论性氘核场论模型(RFMD)下计算了氘核的M1俘获n + p -> D + γ、光磁衰变和反中微子衰变截面.通过考虑手征单介子环修正和Delta(1232)共振的贡献,计算了M1俘获的截面.通过考虑自旋单重态S波中核子对的末态相互作用,计算了氘核光磁衰变和反中微子衰变的截面。根据S波散射长度和有效作用距离,得到了低能弹性np和nn散射的振幅。这大大放宽了Bahcall和Kamionkowski(Nucl.Phys.A625(1997)893)的陈述,即RFMD不能描述低能弹性核子-核子散射的非零有效范围。在反中微子能谱上平均得到的氘核反中微子衰变的截面与实验值符合得很好。
Trinucleon Photo Reactions with $Δ$-Isobar Excitation: Radiative Nucleon-Deuteron Capture and Two-Body Photo Disintegration of the Three-Nucleon Bound State
Spin asymmetry and GDH sum rule for real and virtual photons for the deuteron
给出了氘核自旋不对称性的一个明确的计算方法和相应的GDH求和规则,包括衰变、单π介子和双π介子以及η介子的产生。对于GDH积分,在衰变通道和介子产生通道之间发现了一个大的抵消。此外,第一个结果的贡献的衰变通道的广义GDH积分在恒定的四动量转移揭示了占主导地位的等矢量M1过渡到$^1$ S $_0$ -状态附近的阈值导致在负的贡献与最小值周围的$Q^2\approx 0.2$ FM $^{-2}$这是由核子异常等矢量磁矩。
Rescattering and finite formation time effects in inclusive and exclusive electro-disintegration of nuclei within a relativistic approach: 1. The deuteron
The present work provides one more evidence of that the solar neutrino problem has an elegant solution based on the hypothesis about the existence of a new, semi-weak, interaction. The analysis of the deuteron disintegration by neutral currents of solar neutrinos, generated by both the electroweak and semi-weak interactions, is fulfilled. A good agreement between the theoretical and experimental results for this process is obtained, which is in harmony with the conclusions of the first part of the work on the other four observed processes with solar neutrinos.
Dynamics of low-energy nuclear forces for electromagnetic and weak reactions with the deuteron in the Nambu-Jona-Lasinio model of light nuclei
在Nambu-Jona-Lasinio轻核模型中,以中子-质子辐射俘获(M1-capture)n + p -> D +光子、氘核光子+ D -> n + p的光磁衰变和弱反应为例,研究了低能电磁和弱核反应的低能核力动力学.它们是太阳质子燃烧p + p -> D +正电子+ nu_e,pep过程p + electron + p -> D + nu_e和带电nu_e + D -> electron + p + p引起的氘核的中微子和反中微子衰变。反nu_e + D ->正电子+ n + n和中性nu_e(反nu_e)+ D -> nu_e(ant-nu_e)+ n + p弱流。
We apply the chiral potential with the momentum space semi-local regularization to the $^2$H and $^3$He photodisintegration processes and to the (anti)neutrino induced deuteron breakup reactions. Specifically, the differential cross section, the photon analyzing power and the final proton polarization have been calculated for the deuteron photodisintegration at the photon energies 30 MeV and 100 MeV. For the $^3$He photodisintegration predictions for the semi-inclusive and exclusive differential cross sections are presented for the photon energies up to 120 MeV. The total cross section is calc…
The quasi-deuteron model introduced by Levinger is used to explain cross sections for knocking out high-momentum protons in photo-absorption on nuclei. This is within a framework we characterize as exhibiting high renormalization group (RG) resolution. Assuming a one-body reaction operator, the nuclear wave function must include two-body short-range correlations (SRCs) with deuteron-like quantum numbers. In a previous paper, we showed that SRC physics can be naturally accounted for at low RG resolution. Here we describe the quasi-deuteron model at low RG resolution and determine the Levinger c…
A Comment on General Formulae for Polarization Observables in Deuteron Electrodisintegration and Linear Relations
我们建立了Arenhövel,Leidemann,and Tomusiak在Few-Body Systems { \bf 15},109(1993)中发表的用于处理氘核两体电蜕变中极化观测量的形式主义和本论文作者在Phys.~修订版~ C { \bf 40},2479(1989).我们对两组结果之间的重叠进行评论。