WorldWideScience

Sample records for anomalons

  1. Search for anomalons and fragments with fractional charge among the products of fragmentation of /sup 16/O nuclei with momentum 4. 5 GeV/c per nucleon

    Energy Technology Data Exchange (ETDEWEB)

    Avdei-brevechikov, V.V.; Bogdanov, A.I.; Budilov, V.A.; Zhidkov, N.K.; Gorshkova, N.L.; Kotus, A.; Murin, Y.; Nikitin, V.A.; Nomokonov, P.V.; Trai-brevekova, M.D.; and others

    1986-08-01

    We have carried out a search for nuclei with an anomalous interaction (anomalons) with lifetimeapprox. >5 x 10/sup -8/ sec and fragments with fractional charge among the products of interaction of oxygen nuclei accelerated in the synchrophasotron at the Joint Institute for Nuclear Research to momentum 4.5 GeV/c per nucleon. The primary beam hits a thin target placed in the accelerator chamber. Fragments are detected by a telescope of semiconductor detectors at a distance of 18 m from the target. The mean free paths have been measured in silicon for primary nuclei /sup 7//sub 3/Li, /sup 10//sub 5/B, /sup 12//sub 6/C and fragments with charges 2--7 and momenta 4.5 GeV/c per nucleon. The admixture of anomalons and fragments with fractional charge among normal fragments has been estimated in the range of charges 2less than or equal toZless than or equal to7. The upper limit of the fraction of anomalons is 0.8%, and of fragments with fractional charge 2 x 10/sup -4/ at the 95% confidence level.

  2. Leptophobic boson signals with leptons, jets and missing energy

    OpenAIRE

    Dobrescu, Bogdan A.

    2015-01-01

    Color-singlet gauge bosons with renormalizable couplings to quarks but not to leptons must interact with additional fermions ("anomalons") required to cancel the gauge anomalies. Analyzing the decays of such leptophobic bosons into anomalons, I show that they produce final states involving leptons at the LHC. Resonant production of a flavor-universal leptophobic $Z'$ boson leads to cascade decays via anomalons, whose signatures include a leptonically decaying $Z$, missing energy and several j...

  3. Leptophobic Boson Signals with Leptons, Jets and Missing Energy

    Energy Technology Data Exchange (ETDEWEB)

    Dobrescu, Bogdan A.

    2015-06-14

    Color-singlet gauge bosons with renormalizable couplings to quarks but not to leptons must interact with additional fermions (''anomalons'') required to cancel the gauge anomalies. Analyzing the decays of such leptophobic bosons into anomalons, I show that they produce final states involving leptons at the LHC. Resonant production of a flavor-universal leptophobic Z' boson leads to cascade decays via anomalons, whose signatures include a leptonically decaying Z, missing energy and several jets. A Z' boson that couples to the right-handed quarks of the first and second generations undergoes cascade decays that violate lepton universality and include signals with two leptons and jets, or with a Higgs boson, a lepton, a W and missing energy.

  4. Gordon Conference on Nuclear Research

    Energy Technology Data Exchange (ETDEWEB)

    Austin, S.M.

    1983-09-01

    Session topics were: quarks and nuclear physics; anomalons and anti-protons; the independent particle structure of nuclei; relativistic descriptions of nuclear structure and scattering; nuclear structure at high excitation; advances in nuclear astrophysics; properties of nuclear material; the earliest moments of the universe; and pions and spin excitations in nuclei.

  5. Experimental nuclear and radiochemistry. Progress report, 1983

    International Nuclear Information System (INIS)

    Topics include a study of the cascade depletion effect in nuclear reaction calculations, spallation of medium mass targets (scandium, bromine and gallium production), the eigenvector decomposition algorithm for parametrizing spallation charge distribution data, and interaction mean free paths for projectile fragments from relativistic heavy ion reactions in emulsions (anomalons). Publications are listed. 35 references

  6. 7th high energy heavy ion study

    International Nuclear Information System (INIS)

    These proceedings contain the articles presented at the named conference. They deal with relativistic heavy ion reactions, the expansion and freeze-out of nuclear matter, anomalon experiments, and multifragmentation and particle correlations in heavy ion reactions. See hints under the relevant topics. (HSI)

  7. Gordon Conference on Nuclear Research

    International Nuclear Information System (INIS)

    Session topics were: quarks and nuclear physics; anomalons and anti-protons; the independent particle structure of nuclei; relativistic descriptions of nuclear structure and scattering; nuclear structure at high excitation; advances in nuclear astrophysics; properties of nuclear material; the earliest moments of the universe; and pions and spin excitations in nuclei

  8. INTERACTION MEAN FREE PATH OF He PROJECTILE FRAGMENTS FROM 16O-EM COLLISION AT 60 A GeV

    Institute of Scientific and Technical Information of China (English)

    ZHANG DONG-HA1; SUN HAN-CHENG; G.GHARIBI

    2001-01-01

    The interaction mean free path of He projectile fragments, produced by the collisions of 16O at 60 A GeV in a nuclear emulsion, has been investigated. In the present analysis, 1555 He projectile fragments, giving rise to 320 secondary interactions, have been used. At a level of 3% a very weak signal of anomalons is observed, which comes mainly from the 3×He channel.

  9. Heavy ion science: Gateway to the unknown

    Energy Technology Data Exchange (ETDEWEB)

    Bromley, D.A. (Yale Univ., New Haven, CT (USA). Wright Nuclear Structure Lab.)

    1983-05-23

    The author reviews the development of nuclear physics with heavy ions. In this connection he considers elastic scattering and the structure of nuclear molecules, dynamic symmetries in nuclear structure and nuclear reactions, supersymmetry in nuclei, the study of high spin states by heavy ion reactions, deep inelastic heavy ion reactions, the positron production in the Coulomb field of a superheavy nuclear molecule, the study of hydrodynamic and thermodynamic properties of nuclear matter, anomalons, as well as applications to geophysics and technology.

  10. JINR rapid communications

    International Nuclear Information System (INIS)

    The present collection of rapid communications from JINR, Dubna, contains nine separate reports on effects arising from charged particles overcoming of the light velocity barrier, deformable templates for circle recognition, scintillation detectors for precise time measurements, atomic form factors and incoherent scattering functions of atoms and ions with the number of electrons N ≤ 10, experimental set-up ANOMALON for measurement of relativistic nuclear fragmentation cross sections, superconducting dipole magnet for ALICE dimuon arm spectrometer, analysis of transverse mass dependence of Bose-Einstein correlation radii using the DELPHI data, low-energy theorem in softly broken supersymmetry and study of the characteristics of particles in reactions π-, p, d, He, C + C with the total disintegration on carbon nucleus

  11. Electrical resitivity of the Ce (Fe sub(1-x) Al sub(x))2 intermetallic compounds (x < = 0,20)

    International Nuclear Information System (INIS)

    Electric resistivity measurements in function of the temperature (1,5 2 psendo-binary intermetallic compound series in the (x < = 0,20) iron concentrated region. The curves obtained show an anomalons behaviour with evidences of the existence of several magnetic types along the series and also in function of the temperature. Some results are interpreted based on magnetization measurements in some concentrations, which show a characteristic behaviour of spin glass or mictomagnetism at low temperature and evidence of magnetic disordering lowering the temperature from ambient T. The residual, magnetic and phonon resistivity, critical temperature and other data are obtained. It is estimated the contributions due the spin glass clusters and/or mictomagnetism to the residual resistivity and how these contributions affect other quantities. (L.C.)

  12. Nuclear moments and nuclear structure. Annual progress report, August 1, 1981-August 31, 1982

    International Nuclear Information System (INIS)

    This report is a review of the activities of the period from August 1, 1981 through August 31, 1982. The final analysis of pi-zero production in heavy ion collisions representing experiments at the Bevalac with a system previously described is completed. The main results involve cross sections for central collisions resulting in the production of pi-zeros, charged pions, and proton multiplicities, and some results of correlations and low energy gamma radiation. Results from the alpha-alpha experiment at the CERN ISR are included in the form of a published paper and an outline of papers that are in press. A short report of a collision effect in an anomalon experiment is included as well. The energetic particle spectra from μ--capture in medium heavy nuclei were studied at TRIUMF, using the large scintillation counters for neutron and proton detection and multiple Ge(Li) and NaI(Tl) counters. The preliminary analysis indicates the presence of such an unusual energetic component. The measurement of the particle and γ-ray correlation in π--capture in 165Ho was completed during this year, and the data analysis is continuing in order to elucidate the discrete spectral features, high spin generation and other correlations. A measurement was finished in our search for a new type of strong perturbation of pionic x-ray by the use of coincidences between pionic x-rays and γ-rays from a deformed nuclei