Piasecki, K.; Herrmann, N.; Averbeck, R.; Andronic, A.; Barret, V.; Basrak, Z.; Bastid, N.; Benabderrahmane, M. L.; Berger, M.; Buehler, P.; Cargnelli, M.; Čaplar, R.; Cordier, E.; Crochet, P.; Czerwiakowa, O.; Deppner, I.; Dupieux, P.; Dželalija, M.; Fabbietti, L.; Fodor, Z.; Gasik, P.; Gašparić, I.; Grishkin, Y.; Hartmann, O. N.; Hildenbrand, K. D.; Hong, B.; Kang, T. I.; Kecskemeti, J.; Kim, Y. J.; Kirejczyk, M.; Kiš, M.; Koczon, P.; Korolija, M.; Kotte, R.; Lebedev, A.; Leifels, Y.; Le Fèvre, A.; Liu, J. L.; Lopez, X.; Mangiarotti, A.; Manko, V.; Marton, J.; Matulewicz, T.; Merschmeyer, M.; Münzer, R.; Pelte, D.; Petrovici, M.; Rami, F.; Reischl, A.; Reisdorf, W.; Ryu, M. S.; Schmidt, P.; Schüttauf, A.; Seres, Z.; Sikora, B.; Sim, K. S.; Simion, V.; Siwek-Wilczyńska, K.; Smolyankin, V.; Stoicea, G.; Suzuki, K.; Tymiński, Z.; Wagner, P.; Weber, I.; Widmann, E.; Wiśniewski, K.; Xiao, Z. G.; Xu, H. S.; Yushmanov, I.; Zhang, Y.; Zhilin, A.; Zinyuk, V.; Zmeskal, J.;

The production of K, K and φ(1020) mesons is studied in Al+Al collisions at a beam energy of 1.9A GeV which is close to or below the production threshold in NN reactions. Inverse slopes, anisotropy parameters, and total emission yields of K mesons are obtained. A comparison of the ratio of kinetic energy distributions of K and K mesons to the HSD transport model calculations suggests that the inclusion of the in-medium modifications of kaon properties is necessary to reproduce the ratio. The inverse slope and total yield of φ mesons are deduced. The contribution to K production from φ meson decays is found to be [ 17 ± 3(stat)(syst) ] %. The results are in line with the previous K and φ data obtained for different −7 colliding systems at similar incident beam energies. PACS. 25.75.Dw Particle and resonance production – 13.60.Le Meson production 2 P. Gasik et al.: Strange meson production in Al+Al collisions at 1.9A GeV

NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North Area. The latter has recently been modified to also serve as a fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous components of the NA61/SHINE set-up were inherited from its predecessors, in particular, the last one, the NA49 experiment. Important new detectors and upgrades of the legacy equipment were introduced by the NA61/SHINE Collaboration. This paper describes the state of the NA61/SHINE facility — the beams and the detector system — before the CERN Long Shutdown I, which started in March 2013.

An extension of the NA61/SHINE physics program utilizing hadron production measurements for Fermilab neutrino beams is proposed. The initiative originated from the US groups (the US-NA61 Collaboration) and is supported by the NA61/SHINE Collaboration. The US groups intend to join the NA61/SHINE Collaboration to perform these measurements. We wish to collect dedicated and optimized high-precision hadron production data needed for improved neutrino beams modeling necessary for ongoing and future experiments at Fermilab. Presented is a schedule, analysis and a detector upgrade plan to expose thin targets and replicas of targets used at Fermilab to the NA61/SHINE hadron beam to accumulate a suitably large sample of events to provide a data set which would be essential for future neutrino beams including running experiments using the NuMI and LBNF facilities.

The study of light fragment emission from ion-proton and ion-ion collisions provides a valuable probe for investigating the reaction dynamics at relativistic energies [1]. New data were obtained in the interaction of Fe projectiles of 1 A GeV in a hydrogen and a titanium target, respectively. Mass and charge of the fragments were identified with the FRS. The velocities of the residues were deduced from the magnetic rigidity. The study presented in the figure demonstrates the evidence that the light-fragment emission results from two substantially distinct mechanisms, when changing from the Fe+Ti system to the less excited Fe+p system. Only in the proton-induced spallation, the residues lighter than C are observed forward and backward with respect to the beam frame: this distribution reflects a strong Coulomb component and carries the signature of a binary process [2]. On the other hand, the high excitation induced in Fe+Ti goes mainly into the disintegration of the system, and multifragmentation is expected to be the dominating process. In this case, the velocity distributions show a bell shape. The high emission velocities, and the analysis of the kinetic-energy spectra of the light residues of the proton-induced reaction reveal that the light residues are