Absorption of stopped π− in 59Co, 75As, 197Au and 209Bi investigated by in-beam and activation γ-ray spectroscopy

Pruys, H.; Engfer, R.; Hartmann, R.; Sennhauser, U.; Pfeiffer, H. J.; Walter, H.K.; Morgenstern, J.; Wytténbach, A.; Gadioli, E.; Gadioli-Erba, E.

doi:10.1016/0375-9474(79)90043-5

Cited by 39 publications

(8 citation statements)

References 34 publications

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“…For the sake of consistency, we refer only to the results determined by independently interacting particle models. It is worth mentioning that the EXCITON model of Gadioli applied by the authors of [4] as well as that of Machner [3] come to similar conclusions. This is not so surprising since in both approaches the nuclear relaxation process following bound pion absorption starts with two independent cascades.…”

Section: Nucleon Spectra Following Bound Pion Absorptionsupporting

confidence: 57%

“…3.1 we compare our results with spectra from p-and e-induced reactions at high incident energy. The similarity of nucleon spectra following ~--absorption at rest with PE emission spectra from nucleon induced reactions [2,3,4] indicates that this process should be well predicted by our model. Furthermore, stopped ~ -induced reactions are best suited to test model predictions at the respective maximum spectral energies since collective excitations by inelastic scattering of the projectile as well as its breakup do not occur here.…”

Section: Introductionmentioning

confidence: 69%

“…[2][3][4]). In fact, reactions of this type are best suited to test PE models, especially at the high energy end of the spectra since collective excitations by inelastic scattering of the projectile and its breakup do not disturb here.…”

Section: Nucleon Spectra Following Bound Pion Absorptionmentioning

confidence: 97%

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Analysis of inclusive nucleon spectra fromp- and?-induced reactions in the frame of the INDEX model, and implications for stopped ??-induced reactions

Ernst

Friedland

Stockhorst

1987

Z. Physik A - Atomic Nuclei

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The previously published INDEX model is tested for nucleon spectra from p-and einduced reactions. The results of two alternative versions, the INCLUSIVE INDEX model and the EXCLUSIVE INDEX model, quite well agree with the data. It is found that in the INCLUSIVE INDEX model three preequilibrium stages are sufficient to describe single-and multi-nucleon emission. The model provides an useful first order estimate of the influence of the finite Fermi energy on particle spectra. This effect is very strong for nucleon induced reactions while for c~-induced reactions it can be neglected. The deduced mean-free-path multiplier corroborates the long stated discrepancy between models in which excitons interact independently or not. Using preequilibrium parameters similar to those found for nucleon induced reactions the important branching ratio of contributing np and pp pairs in stopped r~--absorption can be determined by INDEX model calculations. Deduced values from published n-and p-spectra agree reasonably well with those of other experimental analyses but deviate significantly from microscopic model predictions.

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Section: Nucleon Spectra Following Bound Pion Absorptionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 69%

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Analysis of inclusive nucleon spectra fromp- and?-induced reactions in the frame of the INDEX model, and implications for stopped ??-induced reactions

Ernst

Friedland

Stockhorst

1987

Z. Physik A - Atomic Nuclei

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“…At ~ energies exceeding 45 MeV, inelastic ~ scattering by the nuclear field, which is not included in this figure, becomes the dominant contribution. At low ct energies the use of Optical model inverse cross sections instead of semiclassical expressions would better reproduce the data previously explained -is not a free parameter, but is 4 given by aR--~iai. Thus, the quite satisfactory 1 agreement between experimental and calculated spectra over the whole emitted particle energy range shown in Figs.…”

Section: Comparison Of Experimental and Calculated Datamentioning

confidence: 82%

Analysis of59Co (?, x p y n z ?) reactions up to 170 MeV incident ? energy

Gadioli

Erba

Asher³

et al. 1984

Z Physik A

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Excitation functions of several reactions induced by cr particles with energy up to 170 MeV on 59C0 are presented and analysed, together with published particle spectra, in the framework of the Exciton model. The satisfactory reproduction of proton and e spectra as well as of excitation functions of simple reactions in which pre-equilibrium emission dominates, indicates that a realistic description of the e-nucleus interaction mechanism and of the de-excitation of the composite nucleus has been achieved. Present results confirm that the interaction of the cr with individual nucleons of the target nucleus is the dominant process.Nuclear Reactions: 59C0 (e, xpynzcO, 10

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“…It appears reasonable to describe the internuclear cascade process which follows pion absorption using this approach. Earlier calculations [9] using the exciton model made before detailed experimental information on energy spectra became available, calculate only the average multiplicities of the emitted particles rather than the detailed spectra. In the exciton model the approach of the system towards equilibrium is described in terms of a master equation which is a system of coupled differential equations with coefficients related to the transition and emission rates.…”

Section: Exeiton Model Descriptionmentioning

confidence: 99%

Exciton model description of energy spectra following pion absorption in40Ca

Chatterjee

Gupta

1982

Z Physik A

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The spectra of charged particles emitted following the absorption of negative pions at rest in 4~ are calculated. The pion is assumed to be absorbed on a cluster of two or more nucleons resulting in the emission of a primary particle while the remainder of the cluster equilibrates in the nucleus due to further interactions resulting in the emission of secondary particles. The latter process is described by the exciton model valid at the excitation energies encountered for the present case. The proton spectrum is well reproduced assuming absorption on two nucleon clusters only, with a value of R(np/pp) =8___2 for the ratio of the absorption on a quasi-deuteron to that on a quasi-diproton. The analysis of complex particle spectra indicates pion absorption on heavier clusters also and leads to a phenomenological determination of probabilities for these absorption processes relative to those for two-nucleon clusters.

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Absorption of stopped π− in 59Co, 75As, 197Au and 209Bi investigated by in-beam and activation γ-ray spectroscopy

Cited by 39 publications

References 34 publications

Analysis of inclusive nucleon spectra fromp- and?-induced reactions in the frame of the INDEX model, and implications for stopped ??-induced reactions

Analysis of inclusive nucleon spectra fromp- and?-induced reactions in the frame of the INDEX model, and implications for stopped ??-induced reactions

Analysis of59Co (?, x p y n z ?) reactions up to 170 MeV incident ? energy

Exciton model description of energy spectra following pion absorption in40Ca

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