Wed·Jun 1, 2016Wednesday·June 1, 2016

1. 01*

   Low-energy Antikaon Interaction with Nuclei: The AMADEUS Challenge

   Johann Marton🇦🇹 · Massimilliano Bazzi🇮🇹 · Giovanni Bellotti🇮🇹 · Carolina Berucci🇦🇹 · Dimitri Bosnar🇭🇷 · Mario Bragadireanu🇷🇴 · Catalina Curceanu🇮🇹 · Alberto Clozza🇮🇹 · Michael Cargnelli🇦🇹 · Aslan Butt🇮🇹 · Raffaele Del Grande🇮🇹 · Laura Fabbietti🇩🇪 and 16 other authors

   The low-energy strong interaction of antikaons (K-) with nuclei has many facets and rep- resents a lively and challenging research field. It is interconnected to the peculiar role of strangeness, since the strange quark is rather light, but still much heavier than the up and down quarks. Thus, when strangeness is involved one has to deal with spontaneous and explicit symmetry breaking in QCD. It is well known that the antikaon interaction with nucleons is attractive, but how strong ? Is the interaction strong enough to bind nucleons to form kaonic nuclei and, if so, what are the properties (binding energy, decay width)? There are controversial indications for such bound states and new results are expected to come soon. The existence of antikaon mediated bound states might have important consequences since it would open the possibility for the formation of cold baryonic matter of high density which might have a severe impact in astrophysics for the understanding of the composi- tion of compact (neutron) stars. New experimental opportunities could be provided by the AMADEUS experiment at the DA?NE electron-positron collider at LNF-INFN (Frascati, Italy). Pre-AMADEUS studies on the antikaon interaction with nuclei are carried out by analysis of data collected by KLOE in till 2005 and in special data runs using a carbon target insert. Studies for the dedicated AMADEUS detector setup taking advantage of the low-energy antikaons from Phi-meson decay delivered by DAFNE are in progress. Some re- sults obtained so far and the perspectives of the AMADEUS experiment are presented and discussed.

   nucl-exJPS Conf.Proc.(2017)·3 citations
2. 02*

   Total kinetic energy release in the fast neutron-induced fission of ${}^{235}$U

   R. Yanez🇺🇸 · W. Loveland🇺🇸 · J. King🇺🇸 · J.S. Barrett🇺🇸 · N. Fotiades🇺🇸 · H.Y. Lee🇺🇸

   We have measured the total kinetic energy (TKE) release for the ${}^{235}$U(n,f) reaction for $E_n$=2-100 MeV using the 2E method with an array of Si PIN diode detectors. The neutron energies were determined by time of flight measurements using the white spectrum neutron beam at the LANSCE facility. To benchmark the TKE measurement, the TKE release for ${}^{235}$U(n${}_{th}$,f) was also measured using a thermal neutron beam from the Oregon State University TRIGA reactor, giving pre-neutron emission $E_{TKE}^{\ast }=170.7\pm 0.4$ MeV in good agreement with known values. Our measurements are thus absolute measurements. The TKE in ${}^{235}$U(n,f) decreases non-linearly from 169 MeV to 161 MeV for $E_n$=2-100 MeV. The multi-modal fission analysis of mass distributions and TKE indicates the origin of the TKE decrease with increasing neutron energy is a consequence of the fade out of asymmetric fission, which is associated with a higher TKE compared to symmetric fission. The average TKE associated with the superlong, standard I and standard II modes for a given mass is independent of neutron energy. The widths of the TKE distributions are constant from $E_n$=20-100 MeV and hence show no dependence with excitation energy.

   nucl-exNPA(2018)·18 citations
3. 03*

   Neutrino-Induced Reactions on Nuclei

   K. Gallmeister🇩🇪 · U. Mosel🇩🇪 · J. Weil🇩🇪

   Background: Long-baseline experiments such as the planned Deep Underground Neutrino Experiment (DUNE) require theoretical descriptions of the complete event in a neutrino-nucleus reaction. Since nuclear targets are used this requires a good understanding of neutrino-nucleus interactions. Purpose: Develop a consistent theory and code framework for the description of lepton-nucleus interactions that can be used to describe not only inclusive cross sections, but also the complete final state of the reaction. Methods: The Giessen-Boltzmann-Uehling-Uhlenbeck (GiBUU) implementation of quantum-kinetic transport theory is used, with improvements in its treatment of the nuclear ground state and of 2p2h interactions. For the latter an empirical structure function from electron scattering data is used as a basis. Results: Results for electron-induced inclusive cross sections are given as a necessary check for the overall quality of this approach. The calculated neutrino-induced inclusive double-differential cross sections show good agreement with data from neutrino- and antineutrino reactions for different neutrino flavors at MiniBooNE and T2K. Inclusive double-differential cross sections for MicroBooNE, NOvA, MINERvA and LBNF/DUNE are given. Conclusions: Based on the GiBUU model of lepton-nucleus descriptions a good theoretical description of inclusive electron-, neutrino- and antineutrino-nucleus data over a wide range of energies, different neutrino flavors and different experiments is now possible. Since no tuning is involved this theory and code should be reliable also for new energy regimes and target masses. \end{description}

   ↳ nucl-thhep-exhep-phnucl-exPRC(2016)·108 citations
4. 04*

   Initial state fluctuations in collisions between light and heavy ions

   Kevin Welsh🇺🇸 · Jordan Singer🇺🇸 · Ulrich W. Heinz (Ohio State)🇺🇸

   In high energy collisions involving small nuclei (p+p or x+Au collisions where x=p, d, or ${}^3$He) the fluctuating size, shape and internal gluonic structure of the nucleon is shown to have a strong effect on the initial size and shape of the fireball of new matter created in the collision. A systematic study of the eccentricity coefficients describing this initial fireball state for several semi-realistic models of nucleon substructure and for several practically relevant collision systems involving small nuclei is presented. The key importance of multiplicity fluctuations in such systems is pointed out. Our results show large differences from expectations based on conventional Glauber model simulations of the initial state created in such collisions.

   ↳ nucl-thhep-phnucl-exPRC(2016)·75 citations
5. 05*

   Predictions for $p+$Pb Collisions at $\sqrt{s_{NN}}=5$ TeV: Comparison with Data

   J. L. Albacete🇪🇸 · F. Arleo🇫🇷 · G. G. Barnafoldi🇭🇺 · J. Barrette🇫🇷 · W.-T. Deng🇨🇳 · A. Dumitru🇺🇸 · K. J. Eskola🇫🇮 · E. G. Ferreiro🇪🇸 · F. Fleuret🇫🇷 · H. Fujii🇯🇵 · M. Gyulassy🇺🇸 · S. M. Harangozi🇭🇺 and 26 other authors

   Predictions made in Albacete {\it et al} prior to the LHC $p+$Pb run at $\sqrt{s_{NN}}=5$ TeV are compared to currently available data. Some predictions shown here have been updated by including the same experimental cuts as the data. Some additional predictions are also presented, especially for quarkonia, that were provided to the experiments before the data were made public but were too late for the original publication are also shown here.

   ↳ hep-phnucl-exnucl-thIJMPE(2016)·38 citations
6. 06*

   Evidence of strong dynamic core excitation in ${}^{19}$C resonant break-up

   J. A. Lay🇪🇸 · R. de Diego · R. Crespo🇵🇹 · A. M. Moro🇪🇸 · J. M. Arias🇪🇸 · R. C. Johnson

   The resonant break-up of ${}^{19}$C on protons measured at RIKEN [Phys. Lett. B 660, 320 (2008)] is analyzed in terms of a valence-core model for ${}^{19}$C including possible core excitations. The analysis of the angular distribution of a prominent peak appearing in the relative-energy spectrum could be well described with this model and is consistent with the previous assignment of $5/2^{+}$ for this state. Inclusion of core-excitation effects are found to be essential to give the correct magnitude of the cross section for this state. By contrast, the calculation assuming an inert ${}^{18}$C core is found to largely underestimate the data.

   ↳ nucl-thnucl-exPRC(2016)·20 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.