Spektroskopija visokog razlučivanja hiperjezgre 12λb proizvedene reakcijom (e, e ′K+)

The first electroproduction experiment of a hypernucleus was undertaken at the Thomas Jefferson National Acceleration Facility. The (e, e ′K+) reaction was used on a natC target resulting in the observation of the 12ΛB hypernucleus. The excitation spectrum is presented and discussed.U Thomas Jefferson National Acceleration Facility načinili smo prvo mjerenje elektrotvorbe hiperjezgre. Primijenili smo reakciju (e, e ′K+) na meti prirodnog C i opažali hiperjezgre 12ΛB. Raspravljamo spektar uzbude

Spektroskopija visokog razlučivanja hiperjezgre 12λb proizvedene reakcijom (e, e ′K+)

The first electroproduction experiment of a hypernucleus was undertaken at the Thomas Jefferson National Acceleration Facility. The (e, e ′K+) reaction was used on a natC target resulting in the observation of the 12ΛB hypernucleus. The excitation spectrum is presented and discussed.U Thomas Jefferson National Acceleration Facility načinili smo prvo mjerenje elektrotvorbe hiperjezgre. Primijenili smo reakciju (e, e ′K+) na meti prirodnog C i opažali hiperjezgre 12ΛB. Raspravljamo spektar uzbude

Possible Superconducting State up to 210 K in the new Composition of Y-Ba-Cu-O

We have observed the zero resistance state up to 210 K in the mixed system of nominal composition Yj.2BaOSCu04-prepared under simultaneous action oi pulsed electric field up to 30 kV/cm and uniaxial force of 180 kN. The onset of the decrease of the resistance at 281 K in the repeated cycles and preliminary data diamagnetism are understood by us as a possible superconductivity event related to a particular composition

Pionska apsorpcija u 4He

This paper presents a large solid angle measurement of the positive pion absorption cross-section on 4He and its decomposition into partial channels. A large fraction of the absorption cross-section at incident pion kinetic energies of Tπ+ =70, 118, 162, 239, and 330 MeV is due to multinucleon channels.Daju se ishodi mjerenja pod velikim prostornim kutom udarnog presjeka za apsorpciju pozitivnih piona u He4 i razdjela na pojedine kanale. Velik dio apsorpcijskog udarnog presjeka za energije upadnih piona od Tπ+ =70, 118, 162, 239 i 330 MeV je posljedica višenukleonskih kanala

Pionska apsorpcija u 4He

This paper presents a large solid angle measurement of the positive pion absorption cross-section on 4He and its decomposition into partial channels. A large fraction of the absorption cross-section at incident pion kinetic energies of Tπ+ =70, 118, 162, 239, and 330 MeV is due to multinucleon channels.Daju se ishodi mjerenja pod velikim prostornim kutom udarnog presjeka za apsorpciju pozitivnih piona u He4 i razdjela na pojedine kanale. Velik dio apsorpcijskog udarnog presjeka za energije upadnih piona od Tπ+ =70, 118, 162, 239 i 330 MeV je posljedica višenukleonskih kanala

Transverse-spin dependence of the p-p total cross section ΔσT from 0.8 to 2.5 GeV/c

The difference ΔσT=σ(↓↑)-σ(↑↑) between the proton-proton total cross sections for protons in pure transverse-spin states, was measured at incident momenta 0.8 to 2.5 GeV/c in experiments performed at the Los Alamos Clinton P. Anderson Meson Physics Facility and the Argonne Zero Gradient Synchrotron. In agreement with other data, peaks were observed at center-of-mass energies of 2.14 and 2.43 GeV/c2, where 1D2 and 1G4 dibaryon resonances have been proposed

Toxicological Effects of Weapons of Mass Destruction and Noxious Agents in Modern Warfare and Terorrism

Oružja za masovno uništavanje najbolji su primjer uporabe civilizacijskih tehnoloških dostignuća u štetne svrhe i protiv ljudske civilizacije. Unatoč nastojanjima oko kontrole i smanjenja njihove količine, rizik zbog samoga postojanja pa čak i širenja zahtijeva da se o njihovoj uporabi i dalje vodi računa i da se povećaju obrambene mjere – nuklearno-biološko-kemijske obrane (NBKO). Osim suvremenog vojnika koji je u vojnim i mirovnim operacijama diljem svijeta izložen raznim noksama kemijskog, biološkog i radiološkog podrijetla, nezaštićeno i uglavnom slabo educirano civilno stanovništvo može biti izloženo terorističkim napadima. Oružja za masovno uništavanje i nokse kemijskog, biološkog i radiološkog podrijetla uzrokuju razne toksikološke posljedice, a bez obzira na njihovo podrijetlo, imaju zajednički nazivnik djelovanja – poremećaj fi ziološkog stanja u organizmu. Poremećaji proizašli nakon izlaganja tim noksama nerijetko se teško determiniraju, dijagnosticiraju i liječe. U ovome su radu s biomedicinskog aspekta obrađene važnije nokse kemijskog, biološkog i radiološkog podrijetla na temelju odabranih primjera iz terorizma i suvremenog ratovanja: polonij-210, osiromašeni uran, salmonela, bedrenica (antraks), genetički modifi cirane bakterije, polimerno predivo “paučina” i bojni otrovi sarin i iperit.Weapons of mass destruction (WMD) best portray the twisted use of technological achievements against the human species. Despite arm control efforts, WMD threat continues to exist and even proliferate. This in turn calls for improvement in defensive measures against this threat. The modern soldier is exposed to a number of chemical, biological, and radiological agents in military and peace operations, while civilians are mainly exposed to terrorist attacks. Regardless of origin or mode of action, WMDs and other noxious agents aim for the same – to make an organism dysfunctional. Because their effects are often delayed, these agents are hard to spot on time and treat. This review presents a biomedical aspect of agents used in warfare and terrorism, including polonium-210, depleted uranium, salmonella, anthrax, genetically modifi ed bacteria, cobweb-like polymer fi bre, sarin, and mustard gas

Evidence for pion absorption on four nucleons

Experimental spectra from the coincident detection of three nucleons after the pion absorption in $\rm {}^{4}He$ are displayed. The presence of a mechanism with four nucleons participating in the absorption process is made obvious. The total cross-sections for this absorption mode are: $\sigma_{\rm abs}^{\rm 4NA}= (1.0 \pm 0.2)\, {\rm mb}\; {\rm at}\; T_{\pi}=120\;{\rm MeV}$ and $ \sigma_{\rm abs}^{\rm 4NA}= (2.18 \pm 0.65)\, {\rm mb}\; {\rm at}\; T_{\pi}=210\;{\rm MeV}\,.

Possible Superconducting State up to 210 K in the new Composition of Y-Ba-Cu-O

We have observed the zero resistance state up to 210 K in the mixed system of nominal composition Yj.2BaOSCu04-prepared under simultaneous action oi pulsed electric field up to 30 kV/cm and uniaxial force of 180 kN. The onset of the decrease of the resistance at 281 K in the repeated cycles and preliminary data diamagnetism are understood by us as a possible superconductivity event related to a particular composition