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Sako H.,Japan Atomic Energy Agency | Chujo T.,University of Tsukuba | Gunji T.,University of Tokyo | Harada H.,Japan Atomic Energy Agency | And 13 more authors.
Nuclear Physics A | Year: 2014

A future heavy-ion program at J-PARC has been discussed. The QCD phase structure in high baryon density regime will be explored with heavy ions at the beam momenta of around 10 AGeV/c at the beam rate of 1010-1011Hz. For this quest, a large acceptance spectrometer is designed to measure electrons and muons, and rare probes such as multi-strangeness and charmed hadrons/nuclei. A heavy-ion acceleration scheme is under study with a new heavy-ion linac and a new booster ring, which accelerate and inject beams into the existing Rapid-Cycling Synchrotron and Main Ring synchrotron. An overview of the heavy-ion program and an accelerator design, as well as physics goals and a conceptual design of the heavy-ion experiment are discussed. © 2014 Elsevier B.V. Source

Wu L.S.,State University of New York at Stony Brook | Janssen Y.,Broohaven National Laboratory | Marques C.,State University of New York at Stony Brook | Bennett M.C.,Broohaven National Laboratory | And 11 more authors.
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

We present measurements of the specific heat, magnetization, magnetocaloric effect, and magnetic neutron diffraction carried out on single crystals of antiferromagnetic Yb3Pt4, where highly localized Yb moments order at TN=2.4 K in zero field. The antiferromagnetic order was suppressed to TN→0 by applying a field of 1.85 T in the ab plane. Magnetocaloric effect measurements show that the antiferromagnetic phase transition is always continuous for TN0, although a pronounced step in the magnetization is observed at the critical field in both neutron diffraction and magnetization measurements. These steps sharpen with decreasing temperature, but the related divergences in the magnetic susceptibility are cut off at the lowest temperatures, where the phase line itself becomes vertical in the field-temperature plane. As TN→0, the antiferromagnetic transition is increasingly influenced by a quantum critical end point, where TN ultimately vanishes in a first-order phase transition. © 2011 American Physical Society. Source

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