Pionic atom factory project in the RIBF

Itahashi, K.; Itoh, Satoshi; Fukunishi, Nobuhisa; Geißel, H.; Hayano, R. S.; Hirenzaki, S.; Iwasaki, M.; Kienle, Paul; Kimura, R.; Lindberg, K.; Nociforo, C.; Ohnìshì, H.; Okada, S.; Ono, Naoya; Outa, H.; Sato, Masaharu; Suzuki, K.; Suzuki, T.; Tatsuno, H.; Tegnér, P. E.; Wakasugi, M.; Weick, H.; Yamagata-Sekihara, J.; Yamazaki, T.; Yano, Y.; Zartova, I.

doi:10.1007/978-3-642-02803-8_5

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“…Continuous development is in progress aiming at a better spectral resolution of ≤ 150 keV. The major accomplishments in the present experiment will be succeeded by experiments with improved resolution, statistics and systematics errors to deduce π-nucleus isovector scattering length b 1 with better accuracy [30]. A new series of experiments to study pionic atoms over a wide range of nuclei is in preparation and will lead to a better understanding of the fundamental structure of the QCD vacuum based on measurements.…”

Section: (Piaf Collaboration)mentioning

confidence: 99%

Spectroscopy of Pionic Atoms in Sn122(d,He3)<

et al. 2018

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We observed the atomic 1s and 2p states of π^{-} bound to ^{121}Sn nuclei as distinct peak structures in the missing mass spectra of the ^{122}Sn(d,^{3}He) nuclear reaction. A very intense deuteron beam and a spectrometer with a large angular acceptance let us achieve a potential of discovery, which includes the capability of determining the angle-dependent cross sections with high statistics. The 2p state in a Sn nucleus was observed for the first time. The binding energies and widths of the pionic states are determined and found to be consistent with previous experimental results of other Sn isotopes. The spectrum is measured at finite reaction angles for the first time. The formation cross sections at the reaction angles between 0° and 2° are determined. The observed reaction-angle dependence of each state is reproduced by theoretical calculations. However, the quantitative comparison with our high-precision data reveals a significant discrepancy between the measured and calculated formation cross sections of the pionic 1s state.

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Section: (Piaf Collaboration)mentioning

confidence: 99%