The Structure of the Weak Interaction $lambda$ + N $Yields$ N + N

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Empirical evidence on the nonmesic decay of LAMBDA hypernuclei is analyzed in terms of the spin and isospin dependence of the weak interactions A + p yields n + p and LAMBDA + n yields n + n. The nonmesic decay rates for / sub LAMBDA /He/sup 4/ and /sub LAMBDA /H/sup 4/ were obtained by treating the A de-excitation by different nucleons as incoherent and assuming the validity of the DELTA I = 1/2 selection rule for these interactions. The ratios of nonmesic to pi /sup -/ decay modes and of the first reaction to the second were calculated ... continued below

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Pages: 11'

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Block, M. M. & Dalitz, R. H. May 1, 1963.

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Description

Empirical evidence on the nonmesic decay of LAMBDA hypernuclei is analyzed in terms of the spin and isospin dependence of the weak interactions A + p yields n + p and LAMBDA + n yields n + n. The nonmesic decay rates for / sub LAMBDA /He/sup 4/ and /sub LAMBDA /H/sup 4/ were obtained by treating the A de-excitation by different nucleons as incoherent and assuming the validity of the DELTA I = 1/2 selection rule for these interactions. The ratios of nonmesic to pi /sup -/ decay modes and of the first reaction to the second were calculated as 1.68 plus or minus 0.36 and 0.5, respectively, for He/sup 6/ decay. The later ratio for H/sup 4/ was predicted to be 1/(8.8 plus or minus 3.2). Interpretation of the rates is discussed, and it is concluded that if the LAMBDA I = 1/2 rule holds for the LAMBDA -N yields N-N weak interaction and if present ideas about the current-current nature of weak interactions are valid, then the higher-order mesonic corrections to this primary four-fermion interaction must mask the simplicity of their primary form. (D.C.W.)

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Pages: 11'

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: EFINS-63-39
  • Grant Number: AT(11-1) 264
  • DOI: 10.2172/4677039 | External Link
  • Office of Scientific & Technical Information Report Number: 4677039
  • Archival Resource Key: ark:/67531/metadc1035099

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  • May 1, 1963

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Jan. 22, 2018, 3:51 p.m.

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Block, M. M. & Dalitz, R. H. The Structure of the Weak Interaction $lambda$ + N $Yields$ N + N, report, May 1, 1963; Evanston, Illinois. (digital.library.unt.edu/ark:/67531/metadc1035099/: accessed June 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.