Rotational Effects of Nanoparticles for Cooling down Ultracold Neutrons

Abstract

Due to quantum coherence, nanoparticles have very large cross sections when scattering with very cold or Ultracold Neutrons (UCN). By calculating the scattering cross section quantum mechanically at first, then treating the nanoparticles as classical objects when including the rotational effects, we can derive the associated energy transfer. We find that rotational effects could play an important role in slowing down UCN. In consequence, the slowing down efficiency can be improved by as much as ~40%. Since thermalization of neutrons with the moderator requires typically hundreds of collisions between them, a ~40% increase of the efficiency per collision could have a significant effect. Other possible applications, such as neutrons scattering with nano shells and magnetic particles,and reducing the systematics induced by the geometric phase effect using nanoparticles in the neutron Electric Dipole Moment (nEDM), are also discussed in this paper.

Serum 25-Hydroxyvitamin D3 Levels Are Associated with Carotid Intima-Media Thickness and Carotid Atherosclerotic Plaque in Type 2 Diabetic Patients

“…Beyond its traditional calcium-related effects on the bone health, vitamin D is closely related to the occurrence and development of nonskeletal system diseases [ 2 ]. A large number of experimental and clinical evidence have indicated that vitamin D may be negatively correlated with autoimmune diseases [ 3 ], tumor [ 4 ], infectious disease [ 5 ], hypertension [ 6 ], T2DM [ 7 ], metabolic syndrome [ 8 ], and cardiovascular disease (CVD) [ 9 ]. Diabetic macroangiopathy is a major chronic complication and a leading cause of death in patients with T2DM, and its main pathological change is atherosclerosis.…”