On the correspondence between rotational bands in the mass regionsA ≃ 100 andA ≃ 150

A refined technique is presented to project rotational bands observed in the well studiedZ≧60 rare-earth region into the region of stable ground-state deformation atA ～-100 with corresponding neutron numbers ofN ≧60. With this procedure, estimates of properties of so far unknown nuclei in the A～-100 region can be obtained. As an illustration, isotopes aroundN=64 are discussed within this projection method and within the frame-work of the recent quartet model.     

Planning systems and artificial intelligence

Traditional O.R. systems are compared with problem solving in Artificial Intelligence via Expert Systems. The discussion centers on explicit knowledge representation. The general aspects are illustrated by two planning systems:

1. LESP 2: A learning system for inspection plan generation
2. IDA: A system for finding functions and solutions in construction

     

Determination of the partial electron capture- and spontaneous-fission half-lives of254No

The isotope²⁵⁴No was produced in the fusion reaction⁴⁸Ca +²⁰⁸Pb. Using the velocity filter SHIP and radiochemical techniques it was found that the nuclide²⁵⁴No with a half-life of 55 s decays byα, EC, and spontaneous-fission. Deduced partial half-lives are (61±2) s forα-decay, (550 _?160 ⁺³⁷⁰ ) s for EC and [2.2 _?1.0 ^+2.0 ]×10⁴ s for spontaneous fission.     

Study of short-lived silver isotopes with a laser ion source

The continuum part of the⁶Li (a,a)⁶Li (1.47–2.47 MeV) scattering data at E_a=50 MeV are extracted in two discretized bins. Coupled-channel calculations are carried out coupling the 1⁺ ground state of⁶Li with both the resonant, 3⁺ ₁ state, and two non-resonant continuum states. The discretized continuum of the⁶Li (p,p)⁶Li (1.75–3.25 MeV) scattering data at E_p=65 MeV are also analysed on the same footing. In both the cases the effect of coupling is found to be minimal.     

Thermisch stimulierte Lumineszenzerscheinungen. I Einfluß der Vorbehandlung von Kupferstaub und das Phänomen „Kontaktgedächtnis”︁

Thermally Stimulated Luminescence Phenomena. I. Influence of Pretreatment of Copper Dust and the Phenomenon “Contact Memory” The thermally stimulated luminescence of so-called “copper dust” is strongly influenced by its pretreatment. Samples which have been cooled prior to measurement show lower energies and those which have been mechanically treated, irradiated or heated, show higher thermoluminescence energies than samples which have been stored normally. After removal of the samples from the metallic carrier and subsequent heating of the latter, the thermoluminescence energies are proportional to those found for the sample measured immediately before. This phenomenon is considered as “contact memory”. All results are interpreted according to the concept of the hierarchic order.