Possibility of partial phase self-locking of retroreflector elements in a resonator

Measurement of the neutron (³He) spin structure functions at low Q²: A connection between the Bjorken and gerasimov-drell-hearn sum rule

“…In addition, at high enough energy, the energy of the electron E is simply E = pc. It therefore follows that 16) where distances are measured in meters, magnetic fields in teslas, angles in radians, and the resulting energy is in GeV. ARC energy measurements taken in Hall A during E94-010 are shown in Table 2 information about the ARC apparatus in Hall A is available in Ref.…”

“…The GDH sum rule links the total photoabsorption cross-section difference to the nucleon anomalous magnetic moment [16]. This relationship is captured in the following equation:…”

“…1.7. The form of the amplitude used is that of Drell and Hearn [16]. four-momentum q and spin , and the nucleon N has four-momentum p and spin s.…”

“…The importance of the Bjorken Sum Rule as a proving ground for our present knowledge of Quantum Chromodynamics (QCD) in the high Q 2 regime can hardly be overemphasized. At low Q 2 , the integrated quantity of interest is the Gerasimov-Drell-Hearn sum rule [16]:…”

“…In the limit Q 2 → 0 (real photon scattering), the Gerasimov-Drell-Hearn sum rule [16] relates the helicity structure of the sum over all nucleon photo-excitations with its anomalous magnetic moment. It is based on general physics principles: Lorentz and gauge invariance, crossing symmetry, causality, and unitarity.…”