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- W1967331383 abstract "We find a remarkable agreement of the excitation energy spectrum of the ${}^{208}mathrm{Pb}{(d,}^{3}mathrm{He})$ reaction measured at ${T}_{d}=600mathrm{MeV}$ near the ${ensuremath{pi}}^{ensuremath{-}}$ production threshold with its theoretical prediction. Their comparison leads us to assign the distinct narrow peak observed at about 5 MeV below the threshold to the formation of bound pionic states ${ensuremath{pi}}^{ensuremath{-}}{ensuremath{bigotimes}}^{207}mathrm{Pb}$ of the quasisubstitutional configurations ${(2p)}_{{ensuremath{pi}}^{ensuremath{-}}}{(3p}_{3/2}{,3p}_{1/2}{)}_{n}^{ensuremath{-}1}.$ A small bump observed on the tail of the peak is assigned to the pionic $1s$ state. The binding energies ${(B}_{mathrm{nl}})$ and the widths $({ensuremath{Gamma}}_{mathrm{nl}})$ of the pionic orbitals are deduced to be ${B}_{2p}=5.13ifmmodepmelsetextpmfi{}0.02(mathrm{stat})ifmmodepmelsetextpmfi{}0.12(mathrm{syst})mathrm{}mathrm{MeV}$ and ${ensuremath{Gamma}}_{2p}=0.43ifmmodepmelsetextpmfi{}0.06(mathrm{stat})ifmmodepmelsetextpmfi{}0.06(mathrm{syst})mathrm{}mathrm{MeV}$ by decomposing the experimental spectrum into the pionic $1s$ and $2p$ components. While ${B}_{2p}$ and ${ensuremath{Gamma}}_{2p}$ are determined with small ambiguity, ${B}_{1s}$ and ${ensuremath{Gamma}}_{1s}$ are strongly correlated with each other, and are affected by the relative $1s/2p$ cross section ratio assumed, since the $1s$ component is observed only as an unresolved bump. Thus, we have to allow large uncertainties $6.6mathrm{MeV}l{B}_{1s}l6.9mathrm{MeV}$ and $0.4mathrm{MeV}l{ensuremath{Gamma}}_{1s}l1.2mathrm{MeV}.$ The experimental binding energies and widths are compared with theoretically calculated values based on various optical potential parameter sets, and are jointly used to deduce the effective ${ensuremath{pi}}^{ensuremath{-}}$ mass in the nuclear medium." @default.
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- W1967331383 date "2000-07-13" @default.
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- W1967331383 title "Deeply bound<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>states in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>207</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant=normal>Pb</mml:mi></mml:math>formed in the<mml:math xmlns:mml=http://www.w3.org/…" @default.
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- W1967331383 doi "https://doi.org/10.1103/physrevc.62.025202" @default.
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