117373246
Elastic scattering and isobar production at high energies
SummaryUnitarity corrections to Regge-pole amplitudes, as they may be introduced using the Baker-Blankenbecler formalism, are used in the analysis of the structure of differential cross-sections at small and intermediate transfers.RiassuntoSi usano le correzioni di unitarietà alle ampiezze dei poli di Regge, come possono essere introdotte usando il formalismo di Baker-Blankenbecler nell'analisi della struttura di sezioni d'urto differenziali a trasferimenti piccoli e intermedi.РезюмеУнитарные поправки к амплитудам полюсов Редже, как они могут быть введены с помощью формализма Бакера-Бланкенбеклера, используются при анализе структуры дифференциальных поперечных сечений при малых и средних передаваемых импульсах.
124695821
Inelastic strength function from the fragmentation point of view
SummaryThe famous scaling property of deep inelastic electron scattering is rephrased in the framework of the Feynman scaling property, as obtained from limiting fragmentation. The statistical fragmentation model is then used to study the behaviour of the strength functionW2 as the momentum transfer tends to infinity. Although the Bjorken limit vanishes in this model, the Feynman scaling limit is readily satisfied at fixed momentum transfer.RiassuntoSi riformula nel contesto delle proprietà di scala di Feynman, come è ottenuta dalla frammentazione limite, la famosa proprietà di scala dello scattering anelastico profondo degli elettroni. Si usa poi il modello di frammentazione statistico per studiare il comportamento della funzione d'intensitàW2 quando il trasferimento dell'impulso tende all'infinito. Sebbene il limite di Biorken si annulli in questo modello, si trova facilmente il limite di scala di Feynman ad impulso trasferito fisso.РезюмеИзвестное свойство подобия глубоко неупругого электронного рассеяния заново выражается через фейнмановское свойство подобия, как было получено из предельной фрагментации. Затем используется статистическая модель фрагментации для изучения поведения силовой функцииW2, когда передаемый импульс стремится к бескомечности. Хотя предел Ъьеркена обрашается в нуль в этой модели, фейнмановский предел подобия без труда удовлетворяется при фиксированном передаваемом импульсе.
121654533
Meson scattering as a probe for deformed nuclei
Abstract Meson absorption and charge-exchange scattering on oriented, deformed nuclei should provide most valuable information on proton and neutron densities. Effects of the order of 10% or more could be obtained at presently accessible temperatures.
122482568
Physics at Collider Energies
By the end of 1981, the first physics results in the range of energy presently referred to as collider energy \( (\sqrt {s\,} \, > \,500\,Gev) \), should be available, and the topic of these lectures will no longer have the speculative character which it has had, while being discussed over several years already. The success of the ISR, the first proton-proton collider, prompted design studies for colliding rings of much larger energies. The key motivation for such new machines was the discovery of the weak intermediate bosons which the many successes already scored by the Standard model of the Electro-Weak interactionsO lead one to expect in the 80–100 Gev range. In order to produce the weak vector bosons as copiously as possible in accordance with their actual couplings, one needs the corresponding mass-energy at the quark-parton level. This requires hadron center of mass energy typically six times larger, hence the range of energy actually considered. The design of Isabelle, a proton-proton colliding ring system with beams of 400 Gev, has prompted many investigations2). The anticipated physics at Collider energy is indeed described in several Isabelle workshop documents. Prospects are great but experimentation is still remote in time.
125497962
A new state of matter
117053773
Physics with accelerators
119237922
Microwave properties of Yttrium Vanadate at cryogenic temperatures
Yttrium Vanadate (YVO4) is a birefringent crystal material used in optical isolators and circulators with potentials for application in cryogenic microwave devices. As microwave properties of the YVO4 are not known, we measured the complex permittivity at the frequency of 25 GHz, using the Hakki-Coleman dielectric resonator technique in the temperature range from 13 K to 80 K. The real part of relative permittivity of YVO4 turned out to be similar to that of Sapphire - one of popular dielectric materials, used at microwave frequencies. The measured loss tangent tang {\delta} of the YVO4 was of the order of 10^(-6) at cryogenic temperatures. As Yttrium Vanadate (YVO4) is easy to synthesis and machine, it may replace the expensive Sapphire in some microwave applications.
44551968
Complex permittivity measurements at variable temperatures of low loss dielectric substrates employing split post and single post dielectric resonators
A split post dielectric resonator in a copper enclosure and a single post dielectric resonator in a cavity with superconducting end-plates have been constructed and used for the complex permittivity measurements of single crystal substrates. (La,Sr)(Al,Ta)O/sub 3/, LaAlO/sub 3/, MgO and quartz substrates have been measured at temperatures from 20 K to 300 K in the split post resonator and from 15 K to 80 K in the single post resonator. The TE/sub 01/spl delta// mode resonant frequencies and unloaded Q/sub 0/-factors of the empty resonators at temperature of 20 K were: 9.952 GHz and 25,000 for the split post resonator and 10.808 GHz and 240,000 for the single post resonator respectively.
27977554
Comparing unloaded Q-factor of a high-Q dielectric resonator measured using the transmission mode and reflection mode methods involving S-parameter circle fitting
A comparative study of unloaded Q-factor measurements of a TE/sub 011/ mode sapphire dielectric resonator with unloaded Q-factor value of 731,000 at a frequency of 10 GHz and temperature of 65 K using two best Q-factor measurement methods are presented. The transmission (TMQF) and reflection methods are based on relevant multifrequency S-parameter measurements and circle-fitting procedures to compute the unloaded Q-factor of the resonator. For accurate comparison of the methods, a delay compensation procedure (introduced in the TMQF technique to remove delay due to noncalibrated cables) has been applied also to the reflection data.