Thu·Nov 13, 2014Thursday·November 13, 2014

1. 01*

   Light-ion production in the interaction of 175 MeV quasi-mono-energetic neutrons with iron and with bismuth

   R. Bevilacqua🇸🇪 · K. Jansson🇸🇪 · S. Pomp🇸🇪 · P. Andersson🇸🇪 · J. Blomgren🇸🇪 · C. Gustavsson🇸🇪 · A. Hjalmarsson🇸🇪 · V. D. Simutkin🇸🇪 · M. Österlund🇸🇪 · A. J. Koning🇸🇪 · A. V. Prokofiev🇸🇪 · M. Hayashi🇯🇵 and 10 other authors

   Nuclear data for neutron-induced reactions in the intermediate energy range of 20 to 200 MeV are of great importance for the development of nuclear reaction codes since little data exist in that range. Also several different applications benefit from such data, notably accelerator-driven incineration of nuclear waste. The Medley setup was used for a series of measurements of p, d, t, ${}^3$He and $\alpha$-particle production by 175 MeV quasi-mono-energetic neutrons on various target nuclei. The measurements were performed at the The Svedberg Laboratory in Uppsala, Sweden. Eight detector telescopes placed at angles between 20${}^{\circ }$ and 160${}^{\circ }$ were used. Medley uses the $\Delta E$-$\Delta E$-$E$ technique to discriminate among the particle types and is able to measure double-differential cross sections over a wide range of particle energies. This paper briefly describes the experimental setup, summarizes the data analysis and reports on recent changes in the previously reported preliminary data set on bismuth. Experimental data are compared with INCL4.5-Abla07, MCNP6 using CEM03.03, TALYS and PHITS model calculations as well as with nuclear data evaluations. The models agree fairly well overall but in some cases systematic differences are found.

   nucl-exnucl-th0 citations
2. 02*

   Measurement of Parity-Violating Asymmetry in Electron-Deuteron Inelastic Scattering

   D. Wang🇺🇸 · K. Pan🇺🇸 · R. Subedi🇺🇸 · Z. Ahmed🇺🇸 · K. Allada🇺🇸 · K. A. Aniol🇺🇸 · D. S. Armstrong🇺🇸 · J. Arrington🇺🇸 · V. Bellini🇮🇹 · R. Beminiwattha🇺🇸 · J. Benesch🇺🇸 · F. Benmokhtar🇺🇸 and 89 other authors

   The parity-violating asymmetries between a longitudinally-polarized electron beam and an unpolarized deuterium target have been measured recently. The measurement covered two kinematic points in the deep inelastic scattering region and five in the nucleon resonance region. We provide here details of the experimental setup, data analysis, and results on all asymmetry measurements including parity-violating electron asymmetries and those of inclusive pion production and beam-normal asymmetries. The parity-violating deep-inelastic asymmetries were used to extract the electron-quark weak effective couplings, and the resonance asymmetries provided the first evidence for quark-hadron duality in electroweak observables. These electron asymmetries and their interpretation were published earlier, but are presented here in more detail.

   nucl-exhep-exhep-phPRC(2015)·48 citations
3. 03*

   Neutron stars and supernova explosions in the framework of Landau's theory

   H. Zheng🇺🇸 · J. Sahagun🇺🇸 · A. Bonasera🇺🇸

   A general formula of the symmetry energy for many-body interaction is proposed and the commonly used two-body interaction symmetry energy is recovered. Within Landau's theory (Lt), we generalize two equations of state (EoS) CCS$\delta$3 and CCS$\delta$5 to asymmetric nuclear matter. We assume that the density and density difference between protons and neutrons divided by their sum are order parameters. We use different EoS to study neutron stars by solving the TOV equations. We demonstrate that different EoS give different mass and radius relation for neutron stars even when they have exactly the same ground state (gs) properties ($E/A$, ${\rho }_0$, $K$, $S$, $L$ and $K_{sym}$). Furthermore, for one EoS we change $K_{sym}$ and fix all the other gs parameters. We find that for some $K_{sym}$ the EoS becomes unstable at high density even for neutron matter. This suggests that a neutron star (NS) can exist below and above the instability region but in different states: a quark gluon plasma (QGP) at high density and baryonic matter at low density. If the star's central density is in the instability region, then we associate these conditions to the occurrence of Supernovae (SN).

   ↳ nucl-thastro-ph.SRnucl-exIJMPE(2015)·2 citations
4. 04*

   Spin transport in intermediate-energy heavy-ion collisions as a probe of in-medium spin-orbit interactions

   Yin Xia🇨🇳 · Jun Xu🇨🇳 · Bao-An Li🇺🇸 · Wen-Qing Shen🇨🇳

   The spin up-down splitting of collective flows in intermediate-energy heavy-ion collisions as a result of the nuclear spin-orbit interaction is investigated within a spin- and isospin-dependent Boltzmann-Uehing-Uhlenbeck transport model SIBUU12. Using a Skyrme-type spin-orbit coupling quadratic in momentum, we found that the spin splittings of the directed flow and elliptic flow are largest in peripheral Au+Au collisions at beam energies of about 100-200 MeV/nucleon, and the effect is considerable even in smaller systems especially for nucleons with high transverse momenta. The collective flows of light clusters of different spin states are also investigated using an improved dynamical coalescence model with spin. Our study can be important in understanding the properties of in-medium nuclear spin-orbit interactions once the spin-dependent observables proposed in this work can be measured.

   ↳ nucl-thnucl-exNPA(2016)·15 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.