4 results found.
... Science Frontiers ONLINE No. 40: Jul-Aug 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Messengers of a "new physics"In a "garage" off the road tunnel running deep under Mont Blanc sits a huge particle detector called Nusex. A second, complementary experiment resides 600 meters below the surface in a Minnesota mine. Both experiments are tuned to measure charged particles of very high energy, especially muons, which penetrate their high rocky ceilings with ease. These two arrays of buried detectors have both picked up fluxes of muons coming from the direction of Cygnus X-3 Now Cygnus X-3 is already classed as a remarkable object because it spews out pulses of X-rays and gamma-rays. It turns out that the muon fluxes arrive in phase with the pulses of gamma-rays and X-rays, and are thus definitely linked to Cygnus X-3 . The problem here is that muons are electrically charged particles that would assuredly be thrown far off course by intergalactic magnetic fields if they originated at Cygnus X-3 . The muons, therefore, must be created by electrically neutral particles arriving at the earth's atmosphere from Cygnus X-3 . Neutrons can be ruled out because they would decay in transit. X-ray photons and neutrinos have also been ruled out. The only alternative left seems to be some unknown neutral particle generated at Cygnus X-3 . Cygnus X-3may be a huge particle accelerator which "may operate in a realm of physics inaccessible on Earth, ...
Terms matched: 1 - Score: 80 - 15 May 2017 - URL: /sf040/sf040p22.htm
... Science Frontiers ONLINE No. 12: Fall 1980 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Schizophrenic Neutrinos "As the concept of the neutrino has developed since the early 1930s, it has developed a split personality and put on weight. The neutrino is now thought to come in three varieties -- electron neutrino, muon neutrino and tau neutrino. And a number of experiments are showing hints that a neutrino has a small mass and that it can oscillate from one variety to another." These experiments are not yet conclusive; and if the neutrino mass is not zero, it hardly weighs more than the grin of a Cheshire cat. But taken together, the laboratory results confirm that neutrinos are perplexing particles. Are they different entities or a single species wearing different costumes? The implications of the recent measurements are far-reaching: Physicists believe that there are a billion neutrinos around for each nucleon (proton, neutron, etc.) so that if neutrinos possess just a hint of mass, they will dominate the mass of the universe; and Measurements of solar neutrinos fall short by a factor of three of what theory says the sun should spew out. This discrepancy could be explained if the solar neutrinos change from electron neutrinos to another form during their flight from the sun to earth, for the terrestrial neutrino detectors measure only electron neutrinos. (Anonymous; "Do Neutrinos Oscillate from One Variety to Another?" Physics Today, 33:17, July 1980.) From Science Frontiers #12, Fall 1980 . 1980- ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf012/sf012p03.htm
... of stellar furnaces fundamentally in error or are some of the solar neutrinos somehow removed from the stream of neutrinos bound for earth? Recent calculations by Hans Bethe have brought sighs of relief to all astrophysicists. Without going into all of the details, Bethe finds that the interactions of the electron-neutrinos emitted by solar thermonuclear reactions with atoms constituting the solar mass change a substantial fraction of them into muonneutrinos. Since our terrestrial neutrino detectors register only electron-neutrinos, we may really be seeing only a fraction of the total number of neutrinos being emitted by the sun. If Bethe's calculations turn out to be correct, he may have eliminated a Class1 anomaly. But at a price! It seems that his calculations also predict a mass of only 0.008 electron-volts for the muon-neutrino. This is much too small for neutrinos to account for the "missing mass" of the universe -- something cosmologists had devoutly hoped for. (Maddox, John; "Hans Bethe on Solar Neutrinos," Nature, 320:677, 1986.) From Science Frontiers #46, JUL-AUG 1986 . 1986-2000 William R. Corliss ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf046/sf046p06.htm
... we can start looking for intelligent signals impressed upon them by advanced extraterrestrial civilizations. W. Simmons and colleagues at the University of Hawaii at Manoa point out that neutrinos are much better than electromagnetic waves for galaxy-wide communication. They are not blocked by dust nor are they smeared out by ionized gas. Any civilization clever enough to colonize the entire galaxy would want to send out neutrino signals if only to keep clocks in far-flung star systems synchronized. Simmons et al calculate that a neutrino detector containing a cubic kilometer of seawater could probably detect neutrino signals from artificial sources located within 3,000 light years of earth. A detector that might be able to do this is being installed in the ocean off the Hawaiian Islands. Naturally, it has an acronym: DUMAND = Deep Underwater Muon and Neutrino Detector. (Chown, Marcus; "Do ETs Phone Home with Neutrinos?" New Scientist, p. 19, December 3, 1994.) Reference. The problem of the missing solar neutrinos is discussed at length in Section ASF3 in our Catalog The Sun and Solar System Debris. For ordering information, visit here . From Science Frontiers #112, JUL-AUG 1997 . 1997-2000 William R. Corliss ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf112/sf112p03.htm
