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- W1997572401 abstract "A beam of (140ifmmodepmelsetextpmfi{}0.5)-MeV ${ensuremath{pi}}^{ensuremath{-}}$ was produced at the Berkely 184-in. cyclotron and used to study the finalstate interactions of three and four neutrons, and to look for excited levels of the $ensuremath{alpha}$ particle through the reactions ${{ensuremath{pi}}^{ensuremath{-}}+^{4}mathrm{He},ensuremath{rightarrow}{ensuremath{pi}}^{ensuremath{-}}+^{4}mathrm{He}^{*},}{ensuremath{rightarrow}p+3n,}{ensuremath{rightarrow}d+2n,}{ensuremath{rightarrow}{ensuremath{pi}}^{+}+4n.}$ Only one such level is found, with an excitation energy of 32 MeV and an intrinsic width smaller than our 1-MeV resolution. We find that our data on the four-neutron final state, although not inconsistent with phase space, agree more closely with the assumption that there is a $^{1}S_{0}$ final-state interaction between two of the neutrons, the other two not interacting. We find, too, that deuteron production is down by a factor of $ensuremath{approx}{10}^{3}$ from proton production, and that the proton spectrum indicates a stronger-than-expected interaction between the three neutrons in the final state. Lower limits for the production of a tri- or tetraneutron are set." @default.
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- W1997572401 date "1968-11-20" @default.
- W1997572401 modified "2023-09-27" @default.
- W1997572401 title "π−−He4Inelastic and Capture Reactions Leading to Excited and Multineutron Final States" @default.
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- W1997572401 doi "https://doi.org/10.1103/physrev.175.1358" @default.
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