Thu·Aug 6, 2015Thursday·August 6, 2015

1. 01*

   Dynamical description of the fission process using the TD-BCS theory

   Guillaume Scamps🇫🇷 · Cédric Simenel🇦🇺 · Denis Lacroix🇫🇷

   The description of fission remains a challenge for nuclear microscopic theories. The time-dependent Hartree-Fock approach with BCS pairing is applied to study the last stage of the fission process. A good agreement is found for the one-body observables: the total kinetic energy and the average mass asymmetry. The non-physical dependence of two-body observables with the initial shape is discussed.

   ↳ nucl-thnucl-exAIP Conf.Proc.(2015)·2 citations
2. 02*

   New readout and data-acquisition system in an electron-tracking Compton camera for MeV gamma-ray astronomy (SMILE-II)

   Tetsuya Mizumoto🇯🇵 · Yoshihiro Matsuoka🇯🇵 · Yoshitaka Mizumura🇯🇵 · Toru Tanimori🇯🇵 · Hidetoshi Kubo🇯🇵 · Atsushi Takada🇯🇵 · Satoru Iwaki🇯🇵 · Tatsuya Sawano🇯🇵 · Kiseki Nakamura🇯🇵 · Shotaro Komura🇯🇵 · Shogo Nakamura🇯🇵 · Tetsuro Kishimoto🇯🇵 and 8 other authors

   For MeV gamma-ray astronomy, we have developed an electron-tracking Compton camera (ETCC) as a MeV gamma-ray telescope capable of rejecting the radiation background and attaining the high sensitivity of near 1 mCrab in space. Our ETCC comprises a gaseous time-projection chamber (TPC) with a micro pattern gas detector for tracking recoil electrons and a position-sensitive scintillation camera for detecting scattered gamma rays. After the success of a first balloon experiment in 2006 with a small ETCC (using a 10$\times$10$\times$15 cm${}^3$ TPC) for measuring diffuse cosmic and atmospheric sub-MeV gamma rays (Sub-MeV gamma-ray Imaging Loaded-on-balloon Experiment I; SMILE-I), a (30 cm)${}^3$ medium-sized ETCC was developed to measure MeV gamma-ray spectra from celestial sources, such as the Crab Nebula, with single-day balloon flights (SMILE-II). To achieve this goal, a 100-times-larger detection area compared with that of SMILE-I is required without changing the weight or power consumption of the detector system. In addition, the event rate is also expected to dramatically increase during observation. Here, we describe both the concept and the performance of the new data-acquisition system with this (30 cm)${}^3$ ETCC to manage 100 times more data while satisfying the severe restrictions regarding the weight and power consumption imposed by a balloon-borne observation. In particular, to improve the detection efficiency of the fine tracks in the TPC from $\sim$10\% to $\sim$100\%, we introduce a new data-handling algorithm in the TPC. Therefore, for efficient management of such large amounts of data, we developed a data-acquisition system with parallel data flow.

   ↳ astro-ph.IMastro-ph.COastro-ph.HEhep-ex+1Nucl.Instrum.Meth.A(2015)·19 citations
3. 03*

   A short introduction to heavy-ion physics

   Sourendu Gupta🇮🇳

   Heavy-ion collisions provide the only laboratory tests of relativistic quantum field theory at finite temperature. Understanding these is a necessary step in understanding the origins of our universe. These lectures introduce the subject to experimental particle physicists, in the hope that they will be useful to others as well. The phase diagram of QCD is briefly touched upon. Kinematic variables which arise in the collisions of heavy-ions beyond those in the collisions of protons or electrons are introduced. Finally, a few of the signals studied in heavy-ion collisions, and the kind of physics questions which they open up are discussed.

   ↳ nucl-thhep-exhep-phnucl-exCERN-2017-005-SP, pp. 219-238·2 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.