[en] Nuclear states (also bound states) are excited by absorption of γ-rays emitted by the decay of a (p,γ) resonance in a different nucleus. The following states are excited: B at Ex=8.92 MeV ²⁸Si (11.45 MeV), ³⁵Cl (9.08 MeV). The kinematically broadened 6.92 and 7.12 MeV lines from the reaction ¹⁹F(p,γ)¹⁶O, which have a width of about 130 keV at Esub(p)=2 MeV, have been used in resonance fluorescence experiments. Level widths are reported for the reactions ¹⁶O(γ,γ)¹⁶O and ⁴⁰Ca(γ,γ)⁴⁰Ca. The excitation energies of ²³Na as studied in the reaction ²³Na (γ,γ)²³Na, are discussed

[en] The evaluation of neutron cross sections of ²³Na, material number 1156, for the ENDF/B File is described. Cross sections were evaluated between 10^-5 eV and 15 MeV. Experimental data available up to March 1971 were included in the evaluation

[en] Cross-section ratios for production of 0.439-MeV gamma rays near 55 deg by the ²³Na(n,n'γ)²³Na reaction relative to fast-neutron fission of ²³⁵U have been measured with an error of +-8 percent at intervals of 0.05 MeV from threshold up to approximately 2 MeV with an average neutron energy resolution of approximately 0.07 MeV. Gamma-ray angular distributions were measured at E/sub n/ = 0.644, 0.793, 1.093, 1.245, 1.499, 1.799, and 2.044 MeV. The measured ratios and ENDF/B-IV fission cross sections were used to compute gamma-ray production cross sections. The experimental results are compared with data from the literature, and implications for liquid-metal fast breeder reactor technology are discussed

[en] A Coulomb polarimeter primarily to determine the nuclear polarization of a polarized ²³Na beam is described. Coulomb excitation of ²³Na to its first excited state is used. The excited projectiles are identified by coincidences between inelastically scattered particles and deexcitation γ-rays. First results obtained with the polarimeter are in agreement with former experiments for the second rank tensor polarization of such a beam. The first rank tensor polarization of a polarized ²³Na beam could be measured as well. (orig.)

[en] Decay properties of an isotope ²⁶⁶Bh and its daughter nucleus ²⁶²Db produced by the ²⁴⁸Cm(²³Na,5n) reaction were studied by using a gas-filled recoil separator coupled with a position-sensitive semiconductor detector. ²⁶⁶Bh was clearly identified from the correlation of the known nuclide, ²⁶²Db. The obtained decay properties of ²⁶⁶Bh and ²⁶²Db are consistent with those observed in the ²⁷⁸113 chain by RIKEN collaboration, which provided further confirmation of the discovery of ²⁷⁸113.

[en] Direct laboratory measurements of astrophysically important nuclear reactions become increasingly more difficult as regions of lower bombarding energies are being explored. As examples for these challenging experiments, we will report on recent measurements of the ¹⁷O(p,γ)¹⁸F and ²³Na(p,γ)²⁴Mg reactions at the Laboratory for Experimental Nuclear Astrophysics (LENA). We will discuss a typical experimental setup, will present recent experimental results, and will describe their impact on stellar nucleosynthesis

[en] Published in summary form only

[en] Fusion excitation functions and differential cross sections for elastic scattering of aligned, deformed ²³Na on spherical ⁵⁸Ni nuclei are calculated as functions of the orientation of the projectile axis with respect to the scattering plane. Polarisation effects of up to 20% are predicted for a beam of fully aligned ²³Na nuclei. (orig.)

[en] We are currently measuring relaxation times in an optically pumped ²³Na vapor target. Our research is directed toward improvements in the optically pumped Na vapor targets used for the production of polarized H^- ions. In this progress report we review the properties of the optically pumped polarized H^- ion source and especially the optically pumped Na vapor target employed in this source as well as discussing the progress of our research on relaxation times in an optically pumped Na vapor target. 30 references, 6 figures, 3 tables

[en] ²³Na nuclear magnetic resonance (NMR) measurements on poly (propylene oxide) (PPO) and siloxane based polymer electrolytes containing various sodium salts at a single nominal concentration are reported. In addition, differential scanning calorimetry (DSC) and electrical conductivity studies were carried out on the PPO materials. The NMR-determined mobile Na⁺ concentrations and DSC results provide evidence for ionic aggregation effects which, for some samples, result in salt precipitation at elevated temperatures. ²³Na chemical shifts observed in solid state NMR due to mobile Na⁺-anion interactions influence ionic transport as well as the number of available carriers. (author). 19 refs.; 7 figs