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- W2051738504 abstract "The energy dependence of the total angle-integrated cross section for the production of astatine isotopes from (p,${ensuremath{pi}}^{mathrm{ensuremath{-}}}$xn) double charge exchange reactions on bismuth ${(}^{209}$Bi) was measured from 120 to 800 MeV using activation and radiochemical techniques. Chemical yields were estimated by direct radioassaying of $^{211}mathrm{At}$ activity in thin (ensuremath{sim}1 mg/${mathrm{cm}}^{2}$), irradiated bismuth targets. Calculations of the contributions of secondary (two-step) reactions to these measured astatine yields were performed, based partially upon the observed $^{211}mathrm{At}$ activity although even at the highest energies, the contribution to products lighter than $^{207}mathrm{At}$ was negligible. These data for products with as many as seven neutrons removed from the doubly coherent product ${(}^{210}$At) display nearly Gaussian shapes for the mass distributions of the astatine residues, with the maximum occurring for about $^{204}mathrm{At}$. The most probable momentum transfer deduced from these distributions for the initial ${ensuremath{pi}}^{mathrm{ensuremath{-}}}$ production step was 335 MeV/c. The observed excitation functions display a behavior similar to that observed for the yield of $^{210}mathrm{Po}$ from a (p,${ensuremath{pi}}^{0}$) reaction on $^{209}mathrm{Bi}$, but radically different from that observed for inclusive ${ensuremath{pi}}^{mathrm{ensuremath{-}}}$ reactions on a heavy nucleus. These data are discussed in terms of recent theoretical approaches to negative pion production from bismuth. In addition, a simple, schematic model is developed to treat the rapidly decreasing percentage of the total inclusive ${ensuremath{pi}}^{mathrm{ensuremath{-}}}$ emission which is observed for this double charge exchange reaction. This model reflects the opacity of a nucleus to a source of internal energetic protons." @default.
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- W2051738504 date "1985-07-01" @default.
- W2051738504 modified "2023-10-18" @default.
- W2051738504 title "Inclusive measurement of (p,π−xn) double charge exchange reactions on bismuth from threshold to 800 MeV" @default.
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- W2051738504 doi "https://doi.org/10.1103/physrevc.32.253" @default.
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