Since general relativity is a consistent low energy effective field theory, it is possible to compute quantum corrections to classical forces. Here we compute a quantum correction to the gravitational potential between a pair of polarizable objects. We study two distant bodies and compute a quantum force from their induced quadrupole moments due to two-graviton exchange. The effect is in close ...

Hole burning, which is attributed to optical pumping of nuclear-quadrupole levels, has been observed in the stoichiometric rare-earth compound, EuP5O14 . The long lifetime of these holes (-60 min) implies slow nuclear-spin flip-flop rates. The small magnetic moment of Eu3+ has prevented conventional magnetic-resonance measurements on Eu3+ compounds, but hole burning provides a sensitive method ...

The electric quadrupole coupling constant of the ground state of 37K(Iπ = 3/2+, T1/2 = 1.22 s) in a tetragonal KH2PO4 single crystal was measured to be |eqQ/h| = 2.99± 0.07 MHz using the β-ray detecting nuclear quadrupole resonance technique. The electric quadrupole moment of 37K was determined to be |Q(37K)| = 10.6 ± 0.4 efm2, where the known electric quadrupole coupling constant of stable 39K...

The detection of explosives is a challenging topic. The nitrogen-14 nuclear quadrupole resonance technique exploits the transitions between the energy levels split by the quadrupole interaction to detect the presence of explosives. It is a very promising new technique owing to its unambiguous detection and identification of explosives with low false alarm, high sensitivity and fast detection. T...

The four-dimensional transport of the transverse phase space of the extracted beam was calculated for the CAPRICE electron cyclotron resonance (ECR) ion source at GSI. The axial magnetic field adds an angular momentum to the extracted beam, resulting in a strongly x-y coupled beam. The report presents multi-particle tracking simulations, and the results illustrate that the beam brilliance can b...

Non-perturbative time-dependent close-coupling calculations are carried out for the double photoionization of helium including both dipole and quadrupole radiation effects. At a photon energy of 800 eV, accessible at current synchrotron light sources, the quadrupole interaction contributes around 6% to the total integral double photoionization cross section. The pure quadrupole single energy di...

We present theoretical and experimental studies of the center-of-mass sc.m.d stability of ions in a Penning trap with a quadrupole rotating electric field. The rotation frequency of an ion cloud in a Penning trap determines the cloud density and shape, and it can be precisely controlled by a rotating electric field. The quadrupole rotating-field scheme can control pure single-species plasmas in...

The electric-quadrupole coupling constant of the ground states of the proton drip line nucleus 20Na(Iπ = 2+, T1/2 = 447.9 ms) and the neutron-deficient nucleus 21Na(Iπ = 3/2+, T1/2 = 22.49 s) in a hexagonal ZnO single crystal were precisely measured to be |eqQ/h| = 690 ± 12 kHz and 939 ± 14 kHz, respectively, using the multi-frequency β-ray detecting nuclear magnetic resonance technique under p...

This work evaluates the model dependence of the electric and Coulomb quadrupole amplitudes (E2, C2) in the predominantly M1 (magnetic dipole-quark spin flip) γ * N → ∆ transition. Both the model-to-model dependence and the intrinsic model uncertainties are evaluated and found to be comparable to each other and no larger than the experimental errors. It is confirmed that the quadrupole amplitude...

Cocrystals of 4,4'-bipyridyl and several carboxylic acids were grown from the methanol solution of the cocrystal formers. Complete (14)N NQR spectra of these cocrystals have been measured using (1)H-(14)N nuclear quadrupole double resonance. The principal values of the quadrupole coupling tensor are calculated from the (14)N NQR frequencies. A large variation in the (14)N quadrupole coupling co...