10 research outputs found
Electric polarizability of nuclei and a longitudinal sum rule
Recently, a longitudinal sum rule for the electric polarizability of nuclei
was used to revise a relativistic correction in a dipole sum rule for the
polarizability (nucl-th/9802011). This revision is shown to be wrong because of
neglecting an asymptotic contribution in the underlying dispersion relation.
The status and correct use of the longitudinal sum rule is clarified.Comment: 9 pages, revtex, minor clarifications added. To appear in Nucl. Phys.
Electric polarizabilities of proton and neutron and the relativistic center-of-mass coordinate
We argue that the relativistic correction to the
center-of-mass vector can lead to the approximate equality of the proton and
neutron electric polarizabilities in the quark model. The explicit form of
depends only on the non-relativistic potential between
quarks. In particular, this correction is the same for the potential generated
by Lorentz-vector and -scalar interactions.Comment: 8 pages, LaTeX, conclusion extende
Relativistic Oscillator Model and Delbr\"uck scattering
Elastic scattering of photons in a Lorentz-scalar potential via virtual
spin-zero particle-antiparticle pairs (`` Delbr\"uck scattering") is
considered. An analytic expression for the Delbr\"uck amplitude is found
exactly in case of an oscillator potential. General properties of the amplitude
and its asymptotics are discussed.Comment: 8 pages, LATEX, BINP 94-6
Radiative Corrections for Pion Polarizability Experiments
We use the semi-analytical program RCFORGV to evaluate radiative corrections
to one-photon radiative emission in the high-energy scattering of pions in the
Coulomb field of a nucleus with atomic number Z. It is shown that radiative
corrections can simulate a pion polarizability effect. The average effect was
estimated for pion energies 40-600 GeV. We also study the range of
applicability of the equivalent photon approximation in describing one-photon
radiative emission.Comment: 11 pages (LaTex), 6 figures, 1 table. No changes in the paper. New
submission because old files are corrupted in arXi
The Accidental Terrorist: Okhrana Connections to the Extreme-Right and the Attempt to Assassinate Sergei Witte in 1907
This article represents a case study in the relationship between the tsarist secret police (commonly known as the Okhrana in the West and okhranka in Russia) and acts of political terror perpetrated by the extreme-right in late imperial Russia. This specific case concerns the tangled web of conspiracy, propaganda and controversy that surrounded the attempted assassination of former-Chairman of the Council of Ministers, Sergei Witte, in 1907
Possible studies at the first stage of the NICA collider operation with polarized and unpolarized proton and deuteron beams
This paper contains suggestions for experiments with usage of the Spin Physics Detector (SPD) at the first stage of the SPD NICA Programme developing at JINR. Double polarized pp-, dd- and pd- collisions at c.m.s. NN energies of 3.4-10 GeV, which will be accessible at the initial stage of experiments, allow one to study spin dependence of the NN interaction, search for multiquark states at double strangeness, charm and beauty thresholds, study the short-range structure of the deuteron. Double polarized pd scattering offer a possibility to test the Standard Model through the search for T-invariance violation