γγ-Richtungskorrelationsmessungen am79Br

Using gaseous and solid sources of⁷⁹Kr the γγ directional correlations of the 208.6–397.6 keV-, 299.6–306.6 keV- and 389.1-217.1 keV γγ cascades of⁷⁹Br were measured. The results allow the unambiguous assignment of spin and parity to the levels at 397.6 keV (1/2^?) and 306.6 keV (1/2^?). In addition, they confirm the assignment to the level at 217.1 keV (5/2^?).     

ϱ-ω interference in π−p → π−π+ n at 17.2 GeV

Results are presented of a study of ?-ω interference effects in high statistics, good resolution, π^?p → π⁺π^?n data obtained at 17.2 GeV using the CERN-Munich spectrometer. We investigate the t dependence of ?-ω interference in the various ππ production amplitudes. While effects are observed in all the P-wave production amplitudes, the most pronounced structure occurs in the natural parity exchange amplitude in the t interval 0.1 ? ?t ? 0.4 GeV². Under certain assumptions we determine the relative magnitudes and phases of the ?- and ω-production amplitudes as functions of t.     

High spin states and neutron multiplicities after pion capture in181Ta and209Bi

The absorption of stoppedπ ^? in¹⁸¹Ta and²⁰⁹Bi has been investigated by studying prompt and delayedγ-ray spectra. Absolute cross-sections for the yield of isotopes per capturedπ ^? in (π ^?, xn) reactions, as well as the relative probability of populating nuclear states of different spins have been measured for the hafnium and lead isotopes, respectively. A spin as high as 20 has been observed in the production of²⁰⁴Pb. The ground-state rotational bands of the hafnium isotopes are excited to spin values up to 16. Neutron multiplicities as large as 15 have been observed for both targets. A neutron multiplicity of ?8 is most probable for both tantalum and bismuth targets. The strong interaction monopole energy shift? ₀ and widthΓ ⁰ for the 4f level are found to beε ₀(¹⁸¹Ta)=540±100eV; ?₀(²⁰⁹Bi)=1790±150 eV;Γ ₀(¹⁸¹Ta)=225±57 eV;Γ ₀(²⁰⁹Bi) =1166±70 eV. The quadrupole moments, determined from the hyperfine splitting of the 4f pionic atom level, areQ=3.30±0.06b andQ=}-0.50±0.08b for¹⁸¹Ta and²⁰⁹Bi, respectively.     

Elektrolytische L?sungsherstellung zur Stahlanalyse mit der ICP-Spektrometrie

Zusammenfassung Die Lösungsherstellung für die Stahlanalyse mit der ICP-Spectrometrie erfolgt durch Elektrolyse in HCl. Zahlreiche Elemente (wie Al, Si, Mn, Cr, Ni, Co) können in unlegierten und niedriglegierten Stahlproben mit C-Gehalten unter 0.3% bestimmt werden.

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Electrolytic preparation of solution for steel analysis by ICP spectrometry

Summary The preparation of solutions for steel analysis by ICP spectrometry is performed by electrolysis in HCl. Numerous elements (as Al, Si, Mn, Cr, Ni, Co) can be determined in unalloyed and low-alloy steel with C-contents of less than 0.3%.

     

Oscillations in a copper Mössbauer source in low temperature helium after heating by an R-F Pulse

Mössbauer radiation from a copper foil doped with⁵⁷Co is resonantly absorbed in a stationary Be∶⁵⁷Fe absorber. Experiments were performed with the source immersed in liquid He at 4.2K, He gas from 4.2 to 78 K, and in liquid HeII to 2 K. Radio-frequency current pulses through the source cause large increases in transmission, mainly after the end of the pulse. These increases are associated with heat transfer instabilities (Taconis oscillations) at the He-metal interface.