Kavli Affiliate: Tomiyoshi Haruyama | Summary:Discussions in the taskforce meetings in the period of Jan.-Mar. 2009 on the technical possibility of the ultracold neutron (UCN) source at the Japan Proton Accelerator Research Complex (J-PARC) is summarized. | Search Query: arXiv Query: search_query=au:”Haruyama Tomiyoshi”&id_list=&start=0&max_results=10Read More
Kavli Affiliate: Masayuki Nakahata | Summary:A high performance distillation system to remove krypton from xenon was constructed, and a purity level of Kr/Xe = $sim 3 times 10^-12$ was achieved. This development is crucial in facilitating high sensitivity low background experiments such as the search for dark matter in the universe. | Search Query: arXiv […]
Kavli Affiliate: Mark Hartz | Summary:Recent measurements of B hadron properties carried out in sqrt(s)=1.96 TeV p/p-bar collisions at the Tevatron are reviewed. Included are measurements of the Bc+ meson lifetime, using J/psi+l+X final states, and the mass, using J/psi+pi final states, a flavor specific measurement of the Bs0 lifetime in Ds+pi+X decays, simultaneous measurements […]
Kavli Affiliate: Tomiyoshi Haruyama | Summary:A large heat load caused by thermal radiation through a metal shield pipe was observed in a cooling test of a cryostat for a prototype of a cryogenic interferometric gravitational wave detector. The heat load was approximately 1000 times larger than the value calculated by the Stefan-Boltzmann law. We studied […]
Kavli Affiliate: Kai Martens | Summary:We explore the sensitivity of a neutrino detector employing strongly directional high gain radio antennae to detect the conversion of neutrinos above $10^16$ eV in a mountain or the earth crust. The directionality of the antennae will allow both, the low threshold and the suppression of background. This technology would […]
Kavli Affiliate: Kai Martens | Summary:The High Resolution Fly’s Eye Experiment (HiRes) measures cosmic rays (CR) at the highest energies using the air fluorescence technique. As data taking on the Dugway Proving Grounds in Western Utah is finished, the HiRes data are relevant for cosmogenic neutrinos in two different ways. We first use our best […]
Kavli Affiliate: Tomiyoshi Haruyama | Summary:Current status of TAMA and CLIO detectors in Japan is reported in this article. These two interferometric gravitational-wave detectors are being developed for the large cryogenic gravitational wave telescope (LCGT) which is a future plan for detecting gravitational wave signals at least once per year. TAMA300 is being upgraded to […]
Kavli Affiliate: Kunio Inoue | Summary:We present a brief informative overview of a broad ranges of subjects, the solar, the reactor, the geo and the supernova neutrinos (but without excluding possible biases), the topics which consist of the session “Neutrino Physics around MeV Energies” in NOW2006. Contrary to the naive expectation, the field is found […]
Kavli Affiliate: Tomiyoshi Haruyama | Summary:We have measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam sputtered SiO$_2$ and Ta$_2$O$_5$) in cooled mirrors. The loss was nearly independent of the temperature (4 K $sim$ 300 K), frequency, optical loss, and stress caused by the coating, and the details of the manufacturing processes. The […]
Kavli Affiliate: Toshitake Kohno | Summary:The purpose of this article is to analyze several Lie algebras associated to "orbit configuration spaces" obtained from a group G acting freely, and properly discontinuously on the upper 1/2-plane H^2. The Lie algebra obtained from the descending central series for the associated fundamental group is shown to be isomorphic, […]