• A Gurtu

      Articles written in Proceedings – Section A

    • Binding energy andπ+ decay of light hyperfragments

      K N Chaudhari S N Ganguli N K Rao M S Swami A Gurtu J M Kohli M B Singh

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      Binding energy values of hyperfragments from a sample of 541 uniquely identified mesic decays with mass numbers A=3 to 14 are presented. There does not seem to be any detectable difference in the binding energy value of Λ inAH4 obtained from its two-body and three-body decay modes. Within statistical error, the binding energy values of Λ inAH4 andAH4 are also the same. From a sample of 2π+ decay events of hyperfragments the branching ratio ofAH4 decaying byπ+ toπ mode is found to be (1·5±1·0)%.

    • The ratio of non-mesic to π-mesic decay of light hyperfragments

      K N Chaudhari S N Ganguli N K Rao M S Swami A Gurtu M B Singh

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      A new method of obtaining the charge spectrum of light hyperfragments from their residual range distribution is described. This method has been used to determine the ratio (Q) of non-mesic to π-mesic decay of light hyperfragments. The values of Q for hyperfragments of different charges are found to be in good agreement with theoretical calculations of Dalitz.

    • On the hypernuclei resonant statesΛLi6,ΛHe5* andΛBe9*

      N K Rao M S Swami A Gurtu M B Singh

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      An attempt has been made to detect narrow resonant states ofΛHe5* (I = 2),ΛLi6 andΛBe9* (I = 1) from amongst a sample of 128 uniquely identifiedΛH4 and 195 uniquely identifiedΛHe5 hypernuclei produced by stopping Krmesons in a nuclear emulsion stack. From the experimental data presented, it is concluded that the production of any of these resonant states is not appreciable; upper limits of 20% and 15% are set for the proportion ofΛHe5 resulting from the decay ofΛLi6 andΛBe9* respectively.

    • The spin dependence of an weak interaction in the decay of hypernuclei

      N K Rao M S Swami A Gurtu M B Singh

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      From an analysis of 468 hypernuclei (HFs) with ranges > 120 μm, the non-mesic to π-mesic ratio (Q) forΛHe andΛHe5 HFs was found to be 1.37 ±0.17 and 1.58± 0.20 respectively. This data, together with results onΛHe4 and heavy hypernuclei, has been used to deduce spin dependences for Λn and ΛP weak interactions in decay of hypernuclei. It is found that the rates for triplet and singlet interactions between Λ and neutron are 22 ΓΛ and 11 ΓΛ and for Λ and proton are 8.2 ΓΛ and 5.5 ΓΛ respectively, where ΓΛ is the decay rate of Λ. The total decay rates for ΛHe4 andΛHe5 are 1.28 ΓΛ and 0.99 ΓΛ and the non-mesic decay rates are 0.17 ΓΛ and 0.51 ΓΛ respectively.

    • Final state interactions in the decay of light hypernuclei

      N K Rao M S Swami A Gurtu M B Singh

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      The excited states of Li4, Li5 and Be8 have been investigated by studying the final state interactions in the π-mesic decays ofΛHe4,ΛHe5 andΛLi8 respectively. The experimental results indicate the existence of final states like Li5* at 1·8 MeV and Be8* at 0 and 2·9 MeV to be dominant in the decay ofΛHe5* andΛLi8 respectively; the results on the decay ofΛHe4 suggest the presence of a Li4* state at about 4 MeV to dominate.

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