Mon·Dec 15, 2014Monday·December 15, 2014

1. 01*

   Production of isomeric states in the deuteron-induced reaction of gold at incident energy 4 GeV

   A. R. Balabekyan · N. A. Demekhina🇦🇲 · G. S. Karapetyan🇧🇷 · D. R. Drnoyan · V. I. Zhemenik · J. Adam🇺🇸 · L. Zavorka · A. A. Solnyshkin · V. M. Tsoupko-Sitnikov

   The independent cross section ratio for production of nuclei from 197Au targets irradiated with 4 GeV deuterons have been measured by off-line gamma-spectroscopy. On the basis of the measured independent cross section ratio of 198m, gAu the average intrinsic angular momentum of the primary nucleus was estimated by means of a simple statistical-model analysis based on the formalism developed by Huizenga and Vandenbosch.

   nucl-ex0 citations
2. 02*

   Complete and incomplete fusion competition in 11B-induced fission reaction on medium mass targets at intermediate energies

   N. A. Demekhina🇦🇲 · G. S. Karapetyan🇧🇷 · A. R. Balabekyan

   The cross sections for the binary fission of 197Au, 181Ta and 209Bi targets induced by 11B ions were measured at intermediate energies. The fission products cross sections were studied by means of activation analysis in off-line regime observed gamma-ray spectra. The fission cross section is reconstructed on the basis of charge and mass distribution of the fission products.

   nucl-ex1 citation
3. 03*

   Final source eccentricity measured by HBT interferometry with the event shape selection

   Takafumi Niida (for the PHENIX Collaboration)🇯🇵

   Azimuthal angle dependence of the pion source radii has been measured applying the event shape engineering technique at the PHENIX experiment. When events with higher magnitude of second-order flow vector are selected, the oscillation of the source radii is enhanced as well as $v_2$ which leads to the enhancement of the measured final source eccentricity. The event twist effect in the spatial source distribution in the final state has been also explored with AMPT model. Results indicate a possible twisted source due to the initial longitudinal fluctuations.

   nucl-exJ.Phys.Conf.Ser.(2015)·0 citations
4. 04*

   Performance of a new electron-tracking Compton camera under intense radiations from a water target irradiated with a proton beam

   Yoshihiro Matsuoka🇯🇵 · T. Tanimori🇯🇵 · H. Kubo🇯🇵 · A. Takada🇯🇵 · J.D. Parker🇯🇵 · T. Mizumoto🇯🇵 · Y. Mizumura🇯🇵 · S. Iwaki🇯🇵 · T. Sawano🇯🇵 · S. Komura🇯🇵 · T. Kishimoto🇯🇵 · M. Oda🇯🇵 and 7 other authors

   We have developed an electron-tracking Compton camera (ETCC) for use in next-generation MeV gamma ray telescopes. An ETCC consists of a gaseous time projection chamber (TPC) and pixel scintillator arrays (PSAs). Since the TPC measures the three dimensional tracks of Compton-recoil electrons, the ETCC can completely reconstruct the incident gamma rays. Moreover, the ETCC demonstrates efficient background rejection power in Compton-kinematics tests, identifies particle from the energy deposit rate (dE/dX) registered in the TPC, and provides high quality imaging by completely reconstructing the Compton scattering process. We are planning the "Sub-MeV gamma ray Imaging Loaded-on-balloon Experiment" (SMILE) for our proposed all-sky survey satellite. Performance tests of a mid-sized 30 cm-cubic ETCC, constructed for observing the Crab nebula, are ongoing. However, observations at balloon altitudes or satellite orbits are obstructed by radiation background from the atmosphere and the detector itself. The background rejection power was checked using proton accelerator experiments conducted at the Research Center for Nuclear Physics, Osaka University. To create the intense radiation fields encountered in space, which comprise gamma rays, neutrons, protons, and other energetic entities, we irradiated a water target with a 140 MeV proton beam and placed a SMILE-II ETCC near the target. In this situation, the counting rate was five times than that expected at the balloon altitude. Nonetheless, the ETCC stably operated and identified particles sufficiently to obtain a clear gamma ray image of the checking source. Here, we report the performance of our detector and demonstrate its effective background rejection based in electron tracking experiments.

   ↳ astro-ph.IMhep-exnucl-exphysics.ins-detJINST(2015)·7 citations
5. 05*

   Beam Energy Scan a Case for the Chiral Magnetic Effect in Au-Au Collisions

   R.S. Longacre🇺🇸

   The Chiral Magnetic Effect (CME) is predicted for Au-Au collisions at RHIC. However many backgrounds can give signals that make the measurement hard to interpret. The STAR experiment has made measurements at different collisions energy ranging from $\sqrt{s_{NN}}$=7.7 GeV to 62.4 GeV. In the analysis that is presented we show that the CME turns on with energy and is not present in central collisions where the induced magnetic is small.

   ↳ nucl-thnucl-ex0 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.