Fri·Nov 25, 2016Friday·November 25, 2016

1. 01*

   Study of n-n correlations in d + 2H --> p + p + n + n reaction

   E. Konobeevsky · A. Kasparov · M. Mordovskoy · S. Zuyev · V. Lebedev · A. Spassky

   A kinematically complete measurement of the four-body breakup reaction d+2H-->2ps+2ns --> p +p +n +n has been performed at 15 MeV deuteron beam of the SINP MSU. The two protons and neutron were detected at angles close to those of emission of 2ps and 2ns systems. The energy of singlet dineutron state was determined by comparing experimental TOF spectrum of breakup neutrons with simulated spectra depending on this energy. A low value Enn = 0.076 +/- 0.006 keV obtained by fitting procedure apparently indicates an effective enhancement of nn-interaction in the intermediate state of studied reaction.

   nucl-exJ.Phys.Conf.Ser.(2017)·2 citations
2. 02*

   Parity-Even and Time-Reversal-Odd Neutron Optical Potential in Spinning Matter Induced by Gravitational Torsion

   A. N. Ivanov🇦🇹 · W. M. Snow🇺🇸

   Recent theoretical work has shown that spin $1/2$ particles moving through unpolarized matter which sources torsion fields experience a new type of parity-even and time-reversal-odd optical potential if the matter is spinning in the lab frame. This new type of optical potential can be sought experimentally using the helicity dependence of the total cross sections for longitudinally polarized neutrons moving through a rotating cylindrical target. In combination with recent experimental constraints on short-range P--odd, T--even torsion interactions derived from polarized neutron spin rotation in matter one can derive separate constraints on the time components of scalar and pseudoscalar torsion fields in matter. We estimate the sensitivity achievable in such an experiment and briefly outline some of the potential sources of systematic error to be considered in any future experimental search for this effect.

   nucl-exastro-ph.COgr-qcPLB(2017)·8 citations
3. 03*

   Equation of state dependence of directed flow in a microscopic transport model

   Yasushi Nara🇯🇵 · Harri Niemi🇩🇪 · Jan Steinheimer🇩🇪 · Horst Stoecker🇩🇪

   We study the sensitivities of the directed flow in Au+Au collisions on the equation of state (EoS), employing the transport theoretical model JAM. The EoS is modified by introducing a new collision term in order to control the pressure of a system by appropriately selecting an azimuthal angle in two-body collisions according to a given EoS. It is shown that this approach is an efficient method to modify the EoS in a transport model. The beam energy dependence of the directed flow of protons is examined with two different EoS, a first-order phase transition and crossover. It is found that our approach yields quite similar results as hydrodynamical predictions on the beam energy dependence of the directed flow; Transport theory predicts a minimum in the excitation function of the slope of proton directed flow and does indeed yield negative directed flow, if the EoS with a first-order phase transition is employed. Our result strongly suggests that the highest sensitivity for the critical point can be seen in the beam energy range of $4.7\le \text{srtNN}\le 11.5$ GeV.

   ↳ nucl-thhep-phnucl-exPLB(2017)·56 citations
4. 04*

   Accessing Generalized Parton Distributions in Exclusive Photoproduction of a $\gamma \rho$ Pair with a Large Invariant Mass

   R. Boussarie🇵🇱 · B. Pire🇫🇷 · L.Szymanowski🇵🇱 · S. Wallon🇫🇷

   We propose and study the photoproduction of a $\gamma \rho$ pair with a large invariant mass and a small transverse momentum of the final nucleon, as a way to access generalized parton distributions. In the kinematics of JLab 12-GeV, we demonstrate the feasibility of this measurement.

   ↳ hep-phhep-exnucl-exnucl-thAIP Conf.Proc.(2017)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.