Spectra of neutrons from mu -capture in Ca, Tl, Pb, and Bi

The authors report on a correlation experiment, where the spectra of neutrons and of the associated de-excitation gamma -rays, emitted after mu -capture in Ca, Tl, Pb, and Bi, were measured two- dimensionally. The neutron energy was determined directly using a gamma -n time-of-flight technique. Here, the gamma -rays provided time zero signals to start the time-of-flight measurement. In this way, the measurement was restricted to neutron transitions leading to excited final states. (7 refs)

Test der Vakuumpolarisation und Hyperfeinwechselwirkung in myonischen Atomen

In connection with discrepancies between experimental and theoretical values for the vacuum polarization correction in the case of the 5-4 transitions in heavy and medium muonic atoms, the energies of this transition in /sup nat/Hg and /sup 203/Tl were measured at the CERN-SC muon channel. The broadening of the 2/sup +/-0/sup +/- nuclear gamma transition in muonic /sup 190/Os and /sup 192/Os was used to determine the magnetic h.f. splitting of the 2/sup +/ rotational state. The results are compared with the predictions of different models. (7 refs)

Decay patterns of target-like and projectile-like nuclei produced in Kr-84+Au-197, U-nat reactions at E/A=150 MeV

The reactions Kr-84+Au-197 and Kr-84+U-nat were studied at an incident energy of E/A = 150 MeV employing the large-volume neutron multiplicity meter ORION, The observed correlations between the atomic number of projectile-like nuclei (PLN) and neutron multiplicity indicate large deposits of excitation energies in the primary fragments, Angular correlations between fragments from the fission of target-like nuclei (TLN) and secondary PLN show a memory of the reaction plane. No indications for spin effects were found in the TLN-fission fragment distribution

Hot nuclei in reactions induced by 475 MeV, 2 GeV 1^{1}H and 2 GeV 3^3He

Détecteur ORIO