Now showing items 1-20 of 47

  • Acoustic Methods for Obtaining the Pressure Reflection Coefficient from a Buffer Rod Based Measurement Cell 

    Bjørndal, Erlend; Frøysa, Kjell-Eivind (IEEE, 2008-08-08)
    The known acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell are presented, along with 2 new generic approaches for measuring the pressure reflection coefficient ...
    Journal articlePeer reviewed
  • Charged-particle multiplicity measurement in proton–proton collisions at √s = 0.9 and 2.36 TeV with ALICE at LHC 

    The ALICE Collaboration; Aamodt, K.; Abel, N.; Alme, Johan; Bablok, Sebastian Robert; Haaland, Øystein Senneset; Huang, M.; Kanaki, K.; Larsen, Dag Toppe; Nystrand, J.; Pommeresche, Bjørn; Skjerdal, Kyrre; Wagner, B. (Springer, 2010-07-12)
    Charged-particle production was studied in proton–proton collisions collected at the LHC with the ALICE detector at centre-of-mass energies 0.9 TeV and 2.36 TeV in the pseudorapidity range |η|<1.4. In the central region ...
    Peer reviewedJournal article
  • Charged-particle multiplicity measurement in proton–proton collisions at √s = 7 TeV with ALICE at LHC 

    The ALICE Collaboration; Aamodt, K.; Abel, N.; Abeysekara, U.; Alme, Johan; Bablok, Sebastian Robert; Fehlker, D.; Haaland, Øystein Senneset; Huang, M.; Larsen, Dag Toppe; Nystrand, J.; Ullaland, K.; Øvrebekk, G. (Springer, 2010-08-03)
    The pseudorapidity density and multiplicity distribution of charged particles produced in proton–proton collisions at the LHC, at a centre-of-mass energy Ös=7s=7 TeV, were measured in the central pseudorapidity region ...
    Peer reviewedJournal article
  • Climatology of aerosol optical properties in Northern Norway and Svalbard 

    Chen, Yi-Chun; Frette, Ø.; Stamnes, J. J.; Hamre, B. (European Geosciences Union, 2012-12-07)
    We present comparisons between estimates of the aerosol optical thickness and the °Angstr¨om exponent in Northern Norway and Svalbard based on data from AERONET stations at Andenes (69 ◦N, 16 ◦E, 379 m altitude) and ...
    Peer reviewedJournal article
  • Cluster observations of a field aligned current at the dawn flank of a bursty bulk flow 

    Snekvik, Kristian; Haaland, Stein; Østgaard, Nikolai; Hasegawa, H.; Nakamura, R.; Takada, T.; Juusola, L.; Amm, O.; Pitout, F.; Rème, H.; Klecker, B.; Lucek, E. A. (European Geosciences Union, 2007-06-29)
    This article describes observations of a bursty bulk flow (BBF) in the outer central plasma sheet. The observations are made with the Cluster satellites, located approximately 19RE downtail, close to the midnight sector ...
    Journal articlePeer reviewed
  • Confining the angular distribution of terrestrial gamma ray flash emission 

    Gjesteland, Thomas; Østgaard, Nikolai; Collier, A. B.; Carlson, B. E.; Cohen, M. B.; Lehtinen, N. G. (American Geophysical Union, 2011-11-11)
    Peer reviewedJournal article
  • Correlations among elliptic flow parameter, impact parameter, and multiplicity 

    Zhou, Dai-Mei; Cheng, Yun; Yan, Yu-Liang; Dong, Bao-Guo; Sa, Ben-Hao; Csernai, Laszlo P. (Springer, 2010-09-01)
    The elliptic flow parameter, v2, in the Fourier expansion of the event-by-event charged-particle multiplicity azimuthal distribution in the momentum space is studied by taking into account the multiplicity fluctuations. ...
    Peer reviewedJournal article
  • Direct two-photon double ionization of H2 

    Simonsen, A. S.; Sørngård, Stian Astad; Nepstad, Raymond; Førre, Morten (American Physical Society, 2012-06-05)
    We have studied the process of direct (nonsequential) two-photon double ionization of molecular hydrogen (H2). Solving the time-dependent Schr¨odinger equation by an ab initio method, total (generalized) and singlediffe ...
    Peer reviewedJournal article
  • Dose distribution in the thyroid gland following radiation therapy of breast cancer-a retrospective study 

    Johansen, Safora; Reinertsen, K. V.; Knutstad, K.; Olsen, Dag R.; Fosså, S. D. (BioMed Central, 2011-06-09)
    Purpose: To relate the development of post-treatment hypothyroidism with the dose distribution within the thyroid gland in breast cancer (BC) patients treated with loco-regional radiotherapy (RT). Methods and materials: ...
    Peer reviewedJournal article
  • Effects of dead time losses on terrestrial gamma ray flash measurements with the Burst and Transient Source Experiment 

    Gjesteland, Thomas; Østgaard, Nikolai; Connell, P. H.; Stadsnes, J.; Fishman, G. J. (American Geophysical Union, 2010-05-05)
    Peer reviewedJournal article
  • Exploring the CP-violating Inert-Doublet Model 

    Grzadkowski, B.; Ogreid, Odd Magne; Osland, Per; Pukhov, A.; Poormohammadi, Mahdi (Springer, 2011-06-01)
    We have explored properties of an extension of the Inert Doublet Model by the addition of an extra non-inert scalar doublet. The model offers a possibility of CP violation in the scalar sector and a candidate for the ...
    Peer reviewedJournal article
  • Femtosecond-pulse-train ionization of Rydberg wave packets 

    Simonsen, Sigrid Ina; Sørngård, Stian Astad; Førre, Morten; Hansen, Jan Petter (American Physical Society, 2012-10-09)
    We calculate, based on first-order perturbation theory, the total and differential ionization probabilities from a dynamic periodic Rydberg wave packet of a given n-shell exposed to a train of femtosecond laser pulses. ...
    Peer reviewedJournal article
  • Flavour structure of R-violating neutralino decays at the LHC 

    Bomark, Nils-Erik; Choudhury, Debajyoti; Lola, Smaragda; Osland, Per (Springer, 2011-07-15)
    We study signatures of R-parity violation in the production of supersymmetric particles at the LHC, and the subsequent decay of the lightest neutralino being the end product of a supersymmetric cascade decay. In doing ...
    Peer reviewedJournal article
  • The Hall current system revealed as a statistical significant pattern during fast flows 

    Snekvik, Kristian; Nakamura, R.; Østgaard, Nikolai; Haaland, Stein; Retinò, A. (European Geosciences Union, 2008-11-05)
    We have examined the dawn-dusk component of the magnetic field, BY , in the night side current sheet during fast flows in the neutral sheet. 237 h of Cluster data from the plasma sheet between 2 August 2002 and 2 October ...
    Journal articlePeer reviewed
  • High-order harmonic generation from graphene: Strong attosecond pulses with arbitrary polarization 

    Sørngård, Stian Astad; Simonsen, Sigrid Ina; Hansen, Jan Petter (American Physical Society, 2013-05-03)
    We explore high-order harmonic generation (HHG) from a graphene sheet exposed to intense femtosecond laser pulses based on the Lewenstein model. It is demonstrated that the HHG cutoff frequency increases with graphene ...
    Peer reviewedJournal article
  • Interatom intrashell blockade 

    Sælen, L.; Simonsen, Sigrid Ina; Hansen, Jan Petter (American Physical Society, 2011-01-07)
    We demonstrate a feature of the Rydberg blockade mechanism which occurs between two initially excited circular Rydberg atoms. When both atoms are exposed to weak time-dependent electric fields, it is shown that the ...
    Peer reviewedJournal article
  • Limits on the production of the standard model Higgs boson in pp collisions at s=7 TeV with the ATLAS detector 

    The ATLAS Collaboration; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdelalim, A. A.; Buanes, Trygve (Springer, 2011-09-20)
    A search for the Standard Model Higgs boson at the Large Hadron Collider (LHC) running at a centre-of-mass energy of 7 TeV is reported, based on a total integrated luminosity of up to 40 pb−1 collected by the ATLAS detector ...
    Peer reviewedJournal article
  • Luminosity determination in pp collisions at s=7 TeV using the ATLAS detector at the LHC 

    The ATLAS Collaboration; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdelalim, A. A.; Buanes, Trygve (Springer, 2011-04-27)
    Measurements of luminosity obtained using the ATLAS detector during early running of the Large Hadron Collider (LHC) at s=7 TeV are presented. The luminosity is independently determined using several detectors and multiple ...
    Peer reviewedJournal article
  • Marine seismics with a pulsed combustion source and Pseudo Noise codes 

    Askeland, Bjørn; Hobæk, Halvor; Mjelde, Rolf (Springer, 2007-03)
    There has been an ongoing debate for years of how dangerous seismic surveys are with respect to marine life. Marine seismics is today dominated by airgun technology, where high energy is generated by a release of compressed ...
    Journal articlePeer reviewed
  • Measurement of dijet production with a veto on additional central jet activity in pp collisions at ps = 7TeV using the ATLAS detector 

    The ATLAS Collaboration; Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdelalim, A. A.; Buanes, Trygve (Springer, 2011-09-12)
    A measurement of jet activity in the rapidity interval bounded by a dijet system is presented. Events are vetoed if a jet with transverse momentum greater than 20GeV is found between the two boundary jets. The fraction ...
    Peer reviewedJournal article