The π+-decay of a helium hypernucleus

Ismail, Atef; Kenyon, I. R.; Key, A.W.; Lokanathan, S.; Prakash, Y.

doi:10.1016/0031-9163(62)90353-0

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…Several TT + decays of hyperfragments have already been reported. [21][22][23][24][25][26][27] A compilation of all published 7r + decays of hypernuclei is given in Table II. Geometrical data of our TT + event are given in Table III.…”

Section: «+ Decay Of a A He 4 Hyperfragmentmentioning

confidence: 99%

Production of Hyperfragments by the Interactions of 1.5-GeV/cK−Mesons in Lithium-Loaded Emulsions

Beniston¹,

Setti²,

Püschel³

et al. 1964

Phys. Rev.

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Hyperfragment production by some 31 000 interactions of 1.5-GeV/c Kr mesons in Lithium-loaded KS nuclear emulsions has been studied and compared with data from 0.8-GeV/c and existing data from 1.5-GeV/c Kr interactions in normal emulsions. The study of the prong number distributions of the hyperfragment parent stars provides a sensitive method for determining the production rates of hyperfragments by Kr interactions with light (C,iV,0) and heavy (Ag,Br) emulsion nuclei; these production rates are found to be (0.66±0.11)% and (5.20±0.20)%, respectively. An appreciable proportion of mesonic hyperfragments (Z<6) and Li 8 fragments have very short ranges (i?HF<10/i); this fact indicates the possibility of contaminations of "light" hypernuclides among the assumed mesic spallation hyperfragments. The predominant part of the hyperfragment production stars which shows the emission of "short" prongs involves the disintegration of heavy nuclei, thus indicating that Coulomb-barrier criteria cannot be used in discriminating among light or heavy hyperfragment parent stars at high Kr momenta. No double hyperfragment was observed. One Kr interaction emitted two hyperfragments decaying nonmesically. The TT + decay of a AHe 4 hyperfragment has been found. An estimate of the branching ratio R of the T + decay and 7r~ decay modes for the AHe 4 hypernucleus gives R< (2.7dbl.l)%.

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Section: «+ Decay Of a A He 4 Hyperfragmentmentioning

confidence: 99%

Production of Hyperfragments by the Interactions of 1.5-GeV/cK−Mesons in Lithium-Loaded Emulsions

Beniston¹,

Setti²,

Püschel³

et al. 1964

Phys. Rev.

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“…Section IV contains tables of Wilson's calculations which have been rechecked; it also contains a brief comparison of these values with the recent calculations of Crawford and Messel. 2 In Sec. V an approximate procedure is discussed by which the calculations of Wilson can be compared with the experimental numbers, and this comparison is made for the average number of electrons as a function of thickness of lead in showers initiated by 300-MeV electrons.…”

Section: Introductionmentioning

confidence: 98%

Showers in Lead Produced by Electrons with Energies from 300 MeV to 1 BeV

Thom

1964

Phys. Rev.

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The behavior of electron-initiated showers in a lead-plate expansion cloud chamber has been measured for primary energies of 277, 528, 845, and 990 MeV, in terms of the secondary electrons with angles within about 60 deg of the shower axis. Empirical formulas are derived from the experimental data, for characteristic average shower quantities as functions of primary energy. The track length, for example, follows a relation of the form LT-0.07 SEQ 0 -92 radiation lengths, where Eo is measured in MeV. Expected standard errors in determining energies of individual showers by measuring the various quantities are also given. A new tabulation of the results of Wilson's Monte Carlo calculations is given for primary electrons and photons with energies from 50 to 300 MeV. The average numbers of electrons with energies greater than 8 and 10 MeV given in this paper correct the originally published curves and are in good agreement with the results of Crawford and Messel. Approximate comparison is made between the experimentally measured shower behavior and the calculated behavior, and good agreement is found.

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