πHe4 Inelastic and Capture Reactions Leading to Excited and Multineutron Final States

Leon Kaufman, Victor Perez-Mendez, and John Sperinde
Phys. Rev. 175, 1358 – Published 20 November 1968
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Abstract

A beam of (140±0.5)-MeV π 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 α particle through the reactions {π+He4,π+He*4,}{p+3n,}{d+2n,}{π++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 S01 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 103 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.

  • Received 17 May 1968

DOI:https://doi.org/10.1103/PhysRev.175.1358

©1968 American Physical Society

Authors & Affiliations

Leon Kaufman, Victor Perez-Mendez, and John Sperinde

  • Lawrence Radiation Laboratory, University of California, Berkeley, California 94720

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Issue

Vol. 175, Iss. 4 — November 1968

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