Status and future plan of the spectroscopy of pionic atoms

FAIR NExt generation of ScientistS 2013

Watanabe, Y.N.^1 ; Berg, G.P.A.^2 ; Dozono, M.^3 ; Fujioka, H.^4 ; Fukuda, N.^3 ; Furuno, T.^4 ; Geissel, H.^5 ; Hayano, R.S.^1 ; Inabe, N.^3 ; Itahashi, K.^3 ; Itoh, S.^1 ; Kameda, D.^3 ; Kubo, T.^3 ; Matsubara, H.^6 ; Michimasa, S.^7 ; Miki, K.^8 ; Miya, H.^7 ; Murakami, Y.^1 ; Nakamura, M.^3 ; Nakatsuka, N.^4 ; Nishi, T.^1 ; Noji, S.^1 ; Okochi, K.^1 ; Ota, S.^7 ; Suzuki, H.^3 ; Suzuki, K.^9 ; Takaki, M.^7 ; Takeda, H.^3 ; Tanaka, Y.K.^1 ; Todoroki, K.^1 ; Tsukada, K.^10 ; Uesaka, T.^3 ; Weick, H.^5 ; Yamada, H.^1 ; Yamakami, H.^4 ; Yoshida, K.^3

University of Tokyo, 113-0033 Tokyo, Japan^1

JINA, Department of Physics, University of Notre Dame, IN, 46556, United States^2

Nishina Center for Accelerator-Based Science, RIKEN, Saitama, 351-0198, Japan^3

Department of Physics, Kyoto University, 606-8502 Kyoto, Japan^4

GSI Helmholtzzentrum fur Schwerionenforschung GmbH, D-64291 Darmstadt, Germany^5

National Institute of Radiological Sciences (NIRS), Chiba 263-8555, Japan^6

Center for Nuclear Study, University of Tokyo, Tokyo 113-0033, Japan^7

Research Center for Nuclear Physics, Osaka University, 567-0047 Osaka, Japan^8

Stefan-Meyer-Institut fur Subatomare Physik, 1090, Vienna, Austria

(10) Department of Physics, Tohoku University, 980-8578 Sendai, Japan^9

关键词: Active targets;    Chiral symmetry;    Deeply bound pionic state;    Finite density;    Mass spectroscopy;    Pilot experiment;    Q-values;    S state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/503/1/012037/pdf
DOI  :  10.1088/1742-6596/503/1/012037

来源: IOP

【 摘 要 】

The spectroscopy of deeply bound pionic atoms provides a way to understand the restoration of chiral symmetry breaking at finite density. We have been performing a series of experiments of missing-mass spectroscopy of the (d,3He) reaction at RIBF to investigate pionic atoms of several Sn isotopes. As a first step, we conducted a pilot experiment to measure deeply bound pionic states of121Sn and successfully observed the deeply bound pionic states. In addition to the experiment at RIBF, we are planning the spectroscopy of deeply bound pionic atoms in inverse kinematics and conducted a feasible study by simulations. We showed that by using a deuterium gaseous active target TPC and silicon detectors, the Q-value resolution is about 500 keV (FWHM) and the yield of the pionic 1s state is 20 counts/day, indicating the experiment is feasible.