A study has been made of the production of hyperfragments by the interactions of 800-MeV/c K- mesons in nuclear emulsion. The frequency of production, estimated to be 5.3±0.3%, is about the same as for K- mesons at rest. The hyperfragments are emitted predominantly in the forward direction and the ratio of nonmesonic to mesonic decays has been found to be 11.5±0.6, much greater than for K- mesons at rest. The proportion of hyperfragments of short range (range in emulsion

/pdf/production-of-hyperfragments-from-the-interactions-of-800-4mv9hgmgyv.pdf

Production of hyperfragments from the interactions of 800-MeV/c K- mesons with emulsion nuclei

422 K- and 13 ∑--capture stars emitting mesic hyperfragments (MHF) have been studied in an attempt to understand the mechanism of hyperfragment production. 123 K- stars emitting8Li fragments were also considered. Several criteria were used to separate K- captures in C, N, O and Ag, Br. Lower limits for the proportion of MHF produced in C, N, O are 57%, 73%, 84%, and 94% for HΛ, HeΛ, LiΛ and MHF of Z ≥ 4. For8Li, this lower limit is 75%. An overall frequency of (1.05±0.05)·10-2 MHF/K--capture and (3.8±1.4) · 10-2 HF/∑--capture is obtained. The energy spectrum of the pions emitted in the capture stars indicates that a substantial fraction of the emitted bound Λ’s originates in ∑-conversion processes. Indication of bound-Λ production from multinucleon K--capture processes was obtained, important in the case of HΛ. The momentum spectra for different hypernuclear species are very similar and the spectra of HeΛ and LiΛ are, in turn, comparable with the momentum spectra of He and8Li respectively. Hyperfragments are emitted preferentially opposite to the direction of emission of an associated pion or fast proton. The backwards-forward (B/F) ratio is for π, MHF events, 1.8±0.4. Two models for the production of hyperfragments are proposed. According to the first (« trapped-Λ ») the Λ created in the elementary process is trapped in the nuclear potential well of the parent nucleus. The HF is then emitted in the process of nuclear de-excitation. In the second model (« prompt-HF ») the HF is emitted promptly following the K- or ∑- interaction with a group of nucleons. It is concluded that both mechanisms may contribute. The occurrence of both processes can explain essentially all the salient features of hyperfragment emission.

Mesic decays of hypernuclei from K−-capture

In this study of hyperfragment production by K--meson absorptions at rest in emulsion nuclei, an attempt has been made to estimate the contribution of heavy spallation hyperfragments to the total observed number. In a sample of 24 640 K--meson captures, 1612 secondary events have been attributed to the production and subsequent decay of hyperfragments. From a study of the characteristics of both the production and decay disintegrations, it is concluded that about one half of the observed hyperfragments consists of λ0-hyperons trapped in the heavy spallation products of silver and bromine and these are almost entirely confined to the (0/3) μm range interval. The consequences of their presence aie discussed.

/pdf/the-production-of-heavy-hyperfragments-by-k-meson-captures-42i5vfqqop.pdf

The production of heavy hyperfragments by K--meson captures at rest in emulsion nuclei

Presented in this report are lifetime estimates for hypernuclei $_{\ensuremath{\Lambda}}\mathrm{H}^{3}$, $_{\ensuremath{\Lambda}}\mathrm{H}^{4}$, and $_{\ensuremath{\Lambda}}\mathrm{H}^{5}$ based upon data obtained from an emulsion stack exposed to 2.3- and 2.5-BeV/c ${K}^{\ensuremath{-}}$ mesons. These lifetimes are: $\ensuremath{\tau}(_{\ensuremath{\Lambda}}\mathrm{H}^{3})=({{0.9}_{\ensuremath{-}0.4}}^{+2.2})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ sec (3 in-flight and one at-rest decays; $_{\ensuremath{\Lambda}}\mathrm{H}^{3}\ensuremath{\rightarrow}{\mathrm{He}}^{3}+{\ensuremath{\pi}}^{\ensuremath{-}}$); $\ensuremath{\tau}(_{\ensuremath{\Lambda}}\mathrm{H}^{4})=({{1.8}_{\ensuremath{-}0.7}}^{+2.5})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ sec (3 in-flight and 4 at-rest decays; $_{\ensuremath{\Lambda}}\mathrm{H}^{4}\ensuremath{\rightarrow}{\mathrm{He}}^{4}+{\ensuremath{\pi}}^{\ensuremath{-}}$); $\ensuremath{\tau}(_{\ensuremath{\Lambda}}\mathrm{He}^{5})=({{1.4}_{\ensuremath{-}0.5}}^{+1.9})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$ sec (3 in-flight and 25 at-rest decays; $_{\ensuremath{\Lambda}}\mathrm{He}^{5}\ensuremath{\rightarrow}{\mathrm{He}}^{4}+p+{\ensuremath{\pi}}^{\ensuremath{-}}$). Also one decay in flight and nine decays at rest of $_{\ensuremath{\Lambda}}\mathrm{He}^{4}\ensuremath{\rightarrow}{\mathrm{He}}^{3}+p+{\ensuremath{\pi}}^{\ensuremath{-}}$ were observed in a total estimated time of 1.50\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}10}$ sec. Included in the observation times for $_{\ensuremath{\Lambda}}\mathrm{He}^{4}$ and $_{\ensuremath{\Lambda}}\mathrm{He}^{5}$ are contributions from nine ambiguous decays at rest of $_{\ensuremath{\Lambda}}\mathrm{He}^{4.5}\ensuremath{\rightarrow}{\mathrm{He}}^{3.4}\ensuremath{\rightarrow}p+{\ensuremath{\pi}}^{\ensuremath{-}}$.

Lifetimes of Hypernuclei, H3Λ, H4Λ, H5Λ

MESIC DECAYS OF HYPERNUCLEI FROM K$sup -$ CAPTURE. III. CHARACTERISTICS OF THE PARENT STARS

Further results are presented on the binding energies of hypernuclei of mass numberA>5. The data from 56 \gp{su\t-} of such hypernuclei are combined with the previously existing data. Problems in the identification of the heavier hypernuclei are critically discussed. The possible existence of an isomeric state of7HeΛ as suggested byPniewski andDanysz (2) is considered.

Binding energies of hypernuclei with mass number a>5,

SEARCH FOR $Sigma$$sup -$ HYPERFRAGMENTS

The analysis of pi --mesonic decays is used to determine the binding energies of the LAMBDA hyperons in /sup LAMBDA /H/sup 3/, /sub LAMBDA /H/sup 4/ , /sub LAMBDA /He/sup 4/, /sub LAMBDA /He/sup 5/, /sub LAMBDA /He/sup 7/, / sub LAMBDA /Li/sup 7/, /sub lambda /Li/sup 8/, /sub LAMBDA /Li/sup 9/, /sub LAMBDA /Be/sup 8/, /sub LAMBDA /Be/sup 9/, B/sup 11/ , /sub LAMBDA /B/sup 12/, and /sub LAMBDA /C/sup 13/. (T.F.H.)

Compilation of hyperfragment binding energies

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MESIC DECAYS OF HYPERNUCLEI FROM K$sup -$ CAPTURE. III. CHARACTERISTICS OF THE PARENT STARS

Binding energies of hypernuclei with mass number a>5,

SEARCH FOR $Sigma$$sup -$ HYPERFRAGMENTS

Compilation of hyperfragment binding energies