124886812
New Particle Production by anti-neutrinos and New Degrees of Freedom Beyond Charm
118973535
Some Recent Advances in Neutrino Physics
One answer to questions concerning the subject matter of elementary particle physics and its position within the physical sciences is that particle physics is the study of creation. To justify this idea, at least in part, consider the “big bang” model of creation of the universe. In that model the primeval fireball involved very high temperatures, estimated to be greater than 1011 degrees Kelvin (°K), which is to be compared with the interior temperature of the sun at about 107 degrees Kelvin. We believe the sun to be a nuclear furnace, generating its energy by individual nuclear interactions in the million electron volt (MeV) energy range. In the “big bang” the energies involved in the individual particle interactions would have been more than 104 times larger than in the sun, and thus in the tens of giga-electron volts (GeV). This is precisely the energy region of present-day high energy or elementary particle physics laboratory experiments. In this sense, then, laboratory experiments that study, even indirectly, lepton-lepton scattering or quark-quark interactions are revisiting creation.
123899161
NEUTRINOS AND MUONS IN AREA 1.
121246612
Scaling-variable distributions in high-energy inelastic neutrino interactions
118712243
Comments on the letter «Limits on the electromagnetic production of heavy leptons»
38997255
Prototype detector for ultrahigh energy neutrino detection
Abstract Necessary technical experience is being gained from successful construction and deployment of current prototype detectors to search for UHE neutrinos in Antarctica, Lake Baikal in Russia, and the Mediterranean. The prototype detectors have also the important central purpose of determining whether or not UHE neutrinos do in fact exist in nature by observation of at least a few UHE neutrino-induced leptons with properties that are not consistent with expected backgrounds. We discuss here the criteria for a prototype detector to accomplish that purpose in a convincing way even if the UHE neutrino flux is substantially lower than predicted at present.
120768053
Dips in one-pion production processes from a statistical point of view
122704344
Mesonic structure in the nucleon
118910552
Collective effects in the collapse-revival phenomenon and squeezing in the Dicke model
Resonant interaction of a collection of two-level atoms with a single-mode coherent cavity field is considered in the framework of the Dicke model. We focus on the role of collective atomic effects in the phenomenon of collapses and revivals of the Rabi oscillations. It is shown that the behavior of the system strongly depends on the initial atomic state. In the case of the initial half-excited Dicke state we account for a number of interesting phenomena. The correlations between the atoms result in a suppression of the revival amplitude, and the revival time is halved, compared to the uncorrelated fully excited and ground states. The phenomenon of squeezing of the radiation field in the atom-field interaction is also discussed. For the initial fully excited and ground atomic states, the field is squeezed on the short-time scale, and squeezing can be enhanced by increasing the number of atoms. Some empirical formulas are found which describe the behavior of the system in excellent agreement with numerical results. For the half-excited Dicke state, the field can be strongly squeezed on the long-time scale in the case of two atoms. This kind of squeezing is enhanced by increasing the intensity of the initial coherent field and is of the same nature as revival-time squeezing in the Jaynes-Cummings model. The appearance of this long-time squeezing can be explained using the factorization approximation for semiclassical atomic states. @S1050-2947~98!07309-0#
121620440
Study of Approximations in the Nuclear Pairing-Force Problem
118892945
GOVERNING DYNAMICS BY SQUEEZING IN A SYSTEM OF COLD TRAPPED IONS
Department of Physics, Technion–Israel Institute of Technology, Haifa 32000, Israel~Received 4 June 1998!We consider a system of laser-cooled ions in a linear harmonic trap and study the phenomenon of squeezingexchange between their internal and motional degrees of freedom. An interesting relation between the quantumnoise reduction ~squeezing! and the dynamical evolution is found when the internal and motional subsystemsare prepared in properly squeezed ~intelligent! states. Speciﬁcally, the evolution of the system is fully governedby the relative strengths of spectroscopic and motional squeezing, including the phenomenon of total cancel-lation of the interaction when the initial squeezing parameters are equal. @S1050-2947~99!01401-8#PACS number~s!: 03.65.Bz, 42.50.Dv, 42.50.Vk, 32.80.Qk