First pionic atom spectroscopy at RIBF

¹ RIKEN Nishina Center, RIKEN, 351-0198 Saitama, Japan
² JINA and Department of Physics, University of Notre Dame, Indiana 46556, USA
³ Division of Physics and Astronomy, Kyoto University, 606-8502 Kyoto, Japan
⁴ GSI - Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
⁵ Department of Physics, University of Tokyo, 113-0033 Tokyo, Japan
⁶ Department of Physics, Nara Women’s University, 630-8506 Nara, Japan
⁷ Center for Nuclear Study, University of Tokyo, 351-0198 Saitama, Japan
⁸ RCNP, Osaka University, 567-0047 Osaka, Japan
⁹ Stefan-Meyer-Institut für subatomare Physik Austrian Academy of Sciences, Austria
¹⁰ Department of Physics, Tohoku University, 980-8578 Miyagi, Japan

^a e-mail: itahashi@riken.jp

Abstract

We have performed an inclusive spectroscopy of ¹²²Sn(d, ³He) reaction near the pion emission threshold at an incident energy of T_d = 250 MeV/nucleon. The first experiment aims as devloping the high precision spectroscopy of pionic atoms at the RI beam factory (RIBF) of RIKEN, which leads to a new project, pionic Atom Factory project (piAF) to measure pionic atoms for a wide range of elements. We report the analysis status of the pilot experiment.