Polarization observables in neutron-deuteron scattering are calculated to next-to-next-to-nextto-leading order (N 3 LO) in pionless effective field theory (EFT π ). At N 3 LO the two-body P -wave contact interactions are found to be important contributions to the neutron vector analyzing power, A y (θ), and the deuteron vector analyzing power, iT 11 (θ). Extracting the two-body P -wave EFT π coefficients from two-body scattering data and varying them within the expected EFT π theoretical errors provides results that are consistent (at the N 3 LO level) with A y experimental data at low energies. Cutoff dependence of the N 3 LO correction to the doublet S-wave nd scattering amplitude suggests the need for a new three-body force at N 3 LO, which is likely one that mixes Wignersymmetric and Wigner-antisymmetric three-body channels. *

The X(3872) has non-charmonium-like properties, such as decay processes that seem to violate isospin, and a mass that lies unexpectedly close to the D 0D0 * threshold. An EFT that includes both charmonium-like (short distance) and molecule-like (meson bound state) properties is used to analyze the X(3872) as it is produced in the decay of ψ(4160). This is a route that BESIII may be able to measure. We find that the correlation between the angular distribution of the outcoming photon (or X(3872)) and the polarization of the ψ(4160) source may be used to provide information on whether short-distance or long-distance effects dominate.

We report observables for elastic Compton scattering from 3 He in Chiral Effective Field Theory with an explicit ∆(1232) degree of freedom (χEFT) for energies between 50 and 120 MeV. The γ 3 He amplitude is complete at N 3 LO, O(e 2 δ 3 ), and in general converges well order by order. It includes the dominant pion-loop and two-body currents, as well as the Delta excitation in the single-nucleon amplitude. Since the cross section is two to three times that for deuterium and the spin of polarised 3 He is predominantly carried by its constituent neutron, elastic Compton scattering promises information on both the scalar and spin polarisabilities of the neutron. We study in detail the sensitivities of 4 observables to the neutron polarisabilities: the cross section, the beam asymmetry and two double asymmetries resulting from circularly polarised photons and a longitudinally or transversely polarised target. Including the Delta enhances those asymmetries from which neutron spin polarisabilities could be extracted. We also correct previous, erroneous results at N 2 LO, i.e. without an explicit Delta, and compare to the same observables on proton, neutron and deuterium targets. An interactive Mathematica notebook of our results is available from hgrie@gwu.edu. 2S J=0 √ 2J + 1 P S J J M =−J

We present results from a joint theoretical and experimental study of inclusive quasifree electrofission of 238 U. The off-shell cross sections for the quasifree reaction stage have been calculated within the plane wave impulse approximation with distortion corrections included in the effective momentum approximation. Proton and neutron single-particle momentum distributions were calculated in the macroscopic-microscopic approach. The fissility for proton and neutron single hole excited states of the residual nuclei 237 Pa and 237,238 U was calculated within the compound nucleus model. Final state interaction corrections to residual nucleus excitation energy were calculated using the imaginary part of the optical potential. The total inclusive electrofission cross section was measured with high absolute precision, and all principal partial contributions are analyzed, in particular, the quasifree one.

We propose a new type of wire scanner for beam profile measurements, based on the use of a vibrating wire as a scattering target. Synchronous measurements with the wire oscillation allow to detect only the signal coming from the scattering of the beam on the wire. This resonant method enables fast beam profiling in the presence of a high level of background. The developed wire scanner, called resonant target vibrating wire scanner, is applied to photon beam profiling, in which the photons reflected on the wire are measured by a fast photodiode. In addition, the proposed measurement principle is expected to monitor other types of beams as well, such as neutrons, protons, electrons, and ions.