{"paper":{"title":"Spectroscopy of pionic atoms in $\\mathbf{{}^{122}{\\textbf Sn}({\\textit d},{}^3{\\textbf He})}$ reaction and angular dependence of the formation cross sections","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"D. Kameda, G. Mishima, G.P.A. Berg, H. Fujioka, H. Geissel, H. Matsubara, H. Miya, H. Nagahiro, H. Takeda, H. Weick, H. Yamakami, K. Ichikawa, K. Itahashi, K. Kusaka, K. Miki, K. Okochi, K. Suzuki, K. Todoroki, K. Tsukada, K. Yoshida, M. Iwasaki, M. Nakamura, N. Fukuda, N. Fukunishi, N. Ikeno, N. Inabe, N. Sakamoto, R.S. Hayano, S. Hirenzaki, S. Itoh, S. Kawase, S. Michimasa, S. Noji, S. Ota, T. Kubo, T. Nishi, T. Uesaka, Y.K. Tanaka, Y.N. Watanabe","submitted_at":"2017-08-25T06:24:21Z","abstract_excerpt":"We observed the atomic $1s$ and $2p$ states of $\\pi^-$ bound to ${}^{121}{\\rm Sn}$ nuclei as distinct peak structures in the missing mass spectra of the ${}^{122}{\\rm Sn}(d,{}^3{\\rm He})$ nuclear reaction. A very intense deuteron beam and a spectrometer with a large angular acceptance let us achieve potential of discovery, which includes 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 expe"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.07621","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}