IPNS

An international research group led by Senior Professor Kazuma Nakazawa and Postdoctoral Fellow Masahiro Yoshimoto (Graduate School of Education and Engineering, Gifu University), Assistant Professor Junya Yoshida (Graduate School of Science, Tohoku University) and Professor Toshiyuki Takahashi (Institute of Particle Physics and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK)) has observed of a novel hypernucleus called the Xi nucleus. The Xi nucleus contains a Xi-minus particle (i.e. negatively

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An international team of 97 researchers from 26 institutes of 6 countries, Japan, Korea, USA, China, Germany, and Myanmar led by Kazuma Nakazawa, a senior professor of Gifu University, observed the decay of a Xi hypernucleus in a nuclear-emulsion experiment carried out at J-PARC, Tokai, Japan. In the observed event as shown in Fig. 1, which is named “IBUKI” after Ibuki Mountain in Gifu,

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Using Planck data from the cosmic microwave background radiation, an international team of researchers has observed a hint of new physics. The team developed a new method to measure the polarization angle of the ancient light by calibrating it with dust emission from our own Milky Way. While the signal is not detected with enough precision to draw definite conclusions, it may suggest that dark matter or dark energy causes a violation of the so-called “parity symmetry.”

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・A high-strength titanium alloy Ti-6Al-4V is widely employed as the “beam window” at high-intensity proton accelerator facilities, such as FNAL and J-PARC. However, this alloy suffers from radiation-induced hardening and loss of ductility after proton beam exposure. It is urgent to clarify the source of this degradation in mechanical properties to achieve stable high-intensity beam operations at these facilities,

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2020.7.1：Added a new link to related links.

Japan’s High Energy Accelerator Research Organization (KEK) has been steadily improving the performance of its flagship electron-positron collider, SuperKEKB, since it produced its first electron-positron collisions in April 2018. At 20:34 on 15th June 2020, SuperKEKB achieved the world’s highest instantaneous luminosity for a colliding-beam accelerator, setting a record of 2.22×10³⁴ cm^-2 s^-1. Previously, the KEKB collider, which was SuperKEKB’s predecessor and was operated by KEK from 1999 to 2010, had achieved the world’s highest luminosity, reaching 2.11×10³⁴ cm^-2 s^-1. KEKB’s record was surpassed in 2018, when the LHC proton-proton collider at the European Organization for Nuclear Research (CERN) overtook the KEKB luminosity at 2.14×10³⁴ cm^-2 s^-1. SuperKEKB’s recent achievement returns the title of world’s highest luminosity colliding-beam accelerator to KEK.

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