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  • 301. Visinelli, Luca
    et al.
    Baum, Sebastian
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholms universitet, Sverige.
    Redondo, Javier
    Freese, Katherine
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholms universitet, Sverige.
    Wilczek, Frank
    Dilute and dense axion stars2018In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 777, p. 64-72Article in journal (Refereed)
    Abstract [en]

    Axion stars are hypothetical objects formed of axions, obtained as localized and coherently oscillating solutions to their classical equation of motion. Depending on the value of the field amplitude at the core vertical bar theta(0)vertical bar vertical bar theta(r = 0)vertical bar, the equilibrium of the system arises from the balance of the kinetic pressure and either self-gravity or axion self-interactions. Starting from a general relativistic framework, we obtain the set of equations describing the configuration of the axion star, which we solve as a function of vertical bar theta(0)vertical bar. For small vertical bar theta(0)vertical bar less than or similar to 1, we reproduce results previously obtained in the literature, and we provide arguments for the stability of such configurations in terms of first principles. We compare qualitative analytical results with a numerical calculation. For large amplitudes vertical bar theta(0)vertical bar greater than or similar to 1, the axion field probes the full non-harmonic QCD chiral potential and the axion star enters the densebranch. Our numerical solutions show that in this latter regime the axions are relativistic, and that one should not use a single frequency approximation, as previously applied in the literature. We employ a multi-harmonic expansion to solve the relativistic equation for the axion field in the star, and demonstrate that higher modes cannot be neglected in the dense regime. We interpret the solutions in the dense regime as pseudo-breathers, and show that the life-time of such configurations is much smaller than any cosmological time scale.

  • 302. Wang, F.
    et al.
    Sun, B. H.
    Liu, Z.
    Page, R. D.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Scholey, C.
    Ashley, S. F.
    Bianco, L.
    Cullen, I. J.
    Darby, I. G.
    Eeckhaudt, S.
    Garnsworthy, A. B.
    Gelletly, W.
    Gomez-Hornillos, M. B.
    Grahn, T.
    Greenlees, P. T.
    Jenkins, D. G.
    Jones, G. A.
    Jones, P.
    Joss, D. T.
    Julin, R.
    Juutinen, S.
    Ketelhut, S.
    Khan, S.
    Kishada, A.
    Leino, M.
    Niikura, M.
    Nyman, M.
    Pakarinen, J.
    Pietri, S.
    Podolyak, Z.
    Rahkila, P.
    Rigby, S.
    Saren, J.
    Shizuma, T.
    Sorri, J.
    Steer, S.
    Thomson, J.
    Thompson, N. J.
    Uusitalo, J.
    Walker, P. M.
    Williams, S.
    Zhang, H. F.
    Zhang, W. Q.
    Zhu, L. H.
    Spectroscopic factor and proton formation probability for the d3/2 proton emitter 151mLu2017In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 770, p. 83-87Article in journal (Refereed)
    Abstract [en]

    The quenching of the experimental spectroscopic factor for proton emission from the short-lived d3/2 isomeric state in 151mLu was a long-standing problem. In the present work, proton emission from this isomer has been reinvestigated in an experiment at the Accelerator Laboratory of the University of Jyväskylä. The proton-decay energy and half-life of this isomer were measured to be 1295(5) keV and 15.4(8) μs, respectively, in agreement with another recent study. These new experimental data can resolve the discrepancy in the spectroscopic factor calculated using the spherical WKB approximation. Using the R-matrix approach it is found that the proton formation probability indicates no significant hindrance for the proton decay of 151mLu.

  • 303.
    Widen, Erik
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Two-point functions of SU(2)-subsector and length-two operators in dCFT2017In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 773, p. 435-439Article in journal (Refereed)
    Abstract [en]

    We consider a particular set of two-point functions in the setting of N=4SYM with a defect, dual to the fuzzy-funnel solution for the probe D5-D3-brane system. The two-point functions in focus involve a single trace operator in the SU(2)-subsector of arbitrary length and a length-two operator built out of any scalars. By interpreting the contractions as a spin-chain operator, simple expressions were found for the leading contribution to the two-point functions, mapping them to earlier known formulas for the one-point functions in this setting.

  • 304.
    Wimmer, K.
    et al.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan.;RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan..
    Recchia, F.
    Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy.;INFN, Sez Padova, I-35131 Padua, Italy..
    Lenzi, S. M.
    Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy.;INFN, Sez Padova, I-35131 Padua, Italy..
    Riccetto, S.
    Univ Perugia, Dipartimento Fis & Geol, Perugia, Italy.;INFN, Sez Perugia, Perugia, Italy..
    Davinson, T.
    Univ Edinburgh, Sch Phys & Astron, James Clerk Maxwell Bldg, Edinburgh EH9 3FD, Midlothian, Scotland..
    Estrade, A.
    Cent Michigan Univ, Mt Pleasant, MI 48859 USA..
    Griffin, C. J.
    Univ Edinburgh, Sch Phys & Astron, James Clerk Maxwell Bldg, Edinburgh EH9 3FD, Midlothian, Scotland..
    Nishimura, S.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan..
    Nowacki, F.
    CNRS, IN2P3, IPHC, F-67037 Strasbourg, France.;Univ Strasbourg, F-67037 Strasbourg, France..
    Phong, V.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan.;VNU Univ Sci, Fac Phys, 334 Nguyen Trai, Hanoi, Vietnam..
    Poves, A.
    Univ Autonoma Madrid, Dept Theoret Phys, E-28049 Madrid, Spain.;Univ Autonoma Madrid, CSIC, IFT, E-28049 Madrid, Spain..
    Soderstrom, P-A
    Aktas, Özge
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. KTH Royal Inst Technol, Stockholm, Sweden..
    Al-Aqeel, M.
    Univ Liverpool, Dept Phys, Oliver Lodge Bldg,Oxford St, Liverpool L697ZE, Merseyside, England.;Al Imam Mohammad Ibn Saud Islamic Univ IMISU, Coll Sci, Dept Phys, Riyadh 11623, Saudi Arabia..
    Ando, T.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan..
    Baba, H.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan..
    Bae, S.
    Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea.;Seoul Natl Univ, Inst Nucl & Particle Astrophys, Seoul 08826, South Korea..
    Choi, S.
    Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea.;Seoul Natl Univ, Inst Nucl & Particle Astrophys, Seoul 08826, South Korea..
    Doornenbal, P.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan..
    Ha, J.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan.;Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea..
    Harkness-Brennan, L.
    Univ Liverpool, Dept Phys, Oliver Lodge Bldg,Oxford St, Liverpool L697ZE, Merseyside, England..
    Isobe, T.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan..
    John, P. R.
    Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy.;INFN, Sez Padova, I-35131 Padua, Italy.;Tech Univ Darmstadt, Inst Kernphys, Darmstadt, Germany..
    Kahl, D.
    Univ Edinburgh, Sch Phys & Astron, James Clerk Maxwell Bldg, Edinburgh EH9 3FD, Midlothian, Scotland..
    Kiss, G.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan.;Inst Nucl Res MTA ATOMKI, POB 51, H-4001 Debrecen, Hungary..
    Kojouharov, I.
    GSI Helmholtzzentum Schwerionenforsch GmbH, Darmstadt, Germany..
    Kurz, N.
    GSI Helmholtzzentum Schwerionenforsch GmbH, Darmstadt, Germany..
    Labiche, M.
    STFC Daresbury Lab, Warrington, Cheshire, England..
    Matsui, K.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan..
    Momiyama, S.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan..
    Napoli, D. R.
    INFN, Lab Nazl Legnaro, Legnaro, Padova, Italy..
    Niikura, M.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan..
    Nita, C.
    Horia Hulubei Natl Inst Phys & Nucl Engn IFIN HH, Bucharest, Romania..
    Saito, Y.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan..
    Sakurai, H.
    Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan.;RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan..
    Schaffner, H.
    GSI Helmholtzzentum Schwerionenforsch GmbH, Darmstadt, Germany..
    Schrock, P.
    Univ Tokyo, Ctr Nucl Study, Bunkyo Ku, Tokyo 1130033, Japan..
    Stahl, C.
    Tech Univ Darmstadt, Inst Kernphys, Darmstadt, Germany..
    Sumikama, T.
    RIKEN, Nishina Ctr, 2-1 Hirosawa, Saitama 3510198, Japan..
    Werner, V.
    Tech Univ Darmstadt, Inst Kernphys, Darmstadt, Germany..
    Witt, W.
    GSI Helmholtzzentum Schwerionenforsch GmbH, Darmstadt, Germany.;Tech Univ Darmstadt, Inst Kernphys, Darmstadt, Germany..
    Woods, P. J.
    Univ Edinburgh, Sch Phys & Astron, James Clerk Maxwell Bldg, Edinburgh EH9 3FD, Midlothian, Scotland..
    First spectroscopy of Ti-61 and the transition to the Island of Inversion at N=402019In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 792, p. 16-20Article in journal (Refereed)
    Abstract [en]

    Isomeric states in Ti-59,Ti-61 have been populated in the projectile fragmentation of a 345 AMeV( 238)U beam at the Radioactive Isotope Beam Factory. The decay lifetimes and delayed gamma-ray transitions were measured with the EURICA array. Besides the known isomeric state in Ti-59, two isomeric states in Ti-61 are observed for the first time. Based on the measured lifetimes, transition multipolarities as well as tentative spins and parities are assigned. Large-scale shell model calculations based on the modified LNPS interaction show that both Ti-59 and Ti-61 belong to the Island of Inversion at N = 40 with ground state configurations dominated by particle-hole excitations to the g(9/2 )and d(5/2) orbits.

  • 305. Xing, Zhi-zhong
    et al.
    Zhou, Shun
    KTH, School of Engineering Sciences (SCI), Theoretical Physics. Institute of High Energy Physics, Chinese Academy of Sciences, China .
    A partial mu-tau symmetry and its prediction for leptonic CP violation2014In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 737, p. 196-200Article in journal (Refereed)
    Abstract [en]

    We find that the lepton flavor mixing matrix Ushould possess a partial mu-tau permutation symmetry vertical bar U-mu 1 vertical bar =vertical bar U-tau 1 vertical bar, and the latter predicts a novel correlation between the Dirac CP-violating phase delta and three flavor mixing angles theta(12), theta(13) and theta(23) in the standard parametrization. Inputting the best-fit values of these angles reported by Capozzi et al., we obtain the prediction delta similar or equal to 255 degrees. in the normal neutrino mass ordering, which is in good agreement with the best-fit result delta similar or equal to 250 degrees. In this connection the inverted neutrino mass ordering is slightly disfavored. If this partial mu-tau symmetry is specified to be vertical bar U-mu 1 vertical bar = vertical bar U-tau 1 vertical bar = 1/root 6, one can reproduce the phenomenologically-favored relation sin(2)theta(12) = (1 - 2 tan(2)theta(13))/3 and a viable two-parameter description of U which were first uncovered in 2006. Moreover, we point out that the octant of theta(23) and the quadrant of delta can be resolved due to the slight violation of vertical bar U-mu 2 vertical bar = vertical bar U-tau 2 vertical bar and vertical bar U-mu 3 vertical bar = vertical bar U-tau 3 vertical bar either at the tree level or from radiative corrections.

  • 306.
    Zhang, He
    et al.
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Zhou, Shun
    The minimal seesaw model at the TeV scale2010In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 685, no 4-5, p. 297-301Article in journal (Refereed)
    Abstract [en]

    We point out that the minimal seesaw model can provide a natural framework to accommodate tiny neutrino masses, while its experimental testability and notable predictiveness are still maintained. This possibility is based on the Observation that two heavy right-handed Majorana neutrinos in the minimal seesaw model may naturally emerge as a pseudo-Dirac fermion In a specific scenario, we show that the tri-bimaximal neutrino mixing can be produced, and only the inverted neutrino mass hierarchy is allowed The low-energy phenomena, including non-unitarity effects in neutrino oscillations, neutrinoless double-beta decays and rare lepton-flavor-violating decays of charged leptons l(alpha) -> l(beta)gamma, have been explored. The collider signatures of the heavy singlet neutrino are also briefly discussed (C) 2010 Elsevier B.V All rights reserved

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