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  • 301.
    Qi, Chong
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Xu, Zhen-Xiang
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Shell evolution and its indication on the isospin dependence of the spin-orbit splitting2013In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 724, no 4-5, p. 247-252Article in journal (Other academic)
    Abstract [en]

    The available experimental data on shell evolution indicate that the strength of the spin-orbit single-particle potential may be enhanced in neutron-rich nuclei. We observe that such a simple scheme destroys the harmonic oscillator magic numbers N = 8 and 20 and generates new magic numbers like N = 6, 14, 16, 32 and 34. The traditional magic numbers like N = 28 and 50 and N = 14 seen in O-22 are eroded in neutron-rich nuclei due to the sensitivity of larger-l orbitals to the depth of the central potential but they are more robust than the harmonic oscillator magic numbers. The N = 82 shell closure persists in neutron-rich nuclei while the previously proposed shell closures like N = 40 and 70 do not emerge. Both mechanisms contribute to enhancing the N = 56 and 90 gaps by splitting the 1d(5/2) and 0g(7/2) and the 0h(9/2) and 1f(7/2) orbitals.

  • 302.
    Ralet, D.
    et al.
    Univ Paris Saclay, Univ Paris Sud, CSNSM, CNRS IN2P3, F-91405 Orsay, France.;CEA DRF CNRS IN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen, France..
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wieland, O.
    Inst Nazl Fis Nucl, I-20133 Milan, Italy..
    Evidence of octupole-phonons at high spin in Pb-2072019In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 797, article id UNSP 134797Article in journal (Refereed)
    Abstract [en]

    A lifetime measurement of the 19/2(-) state in Pb-207 has been performed using the Recoil Distance Doppler-Shift (RDDS) method. The nuclei of interest were produced in multi-nucleon transfer reactions induced by a Pb-208 beam impinging on a Mo-100 enriched target. The beam-like nuclei were detected and identified in terms of their atomic mass number in the VAMOS++ spectrometer while the prompt gamma rays were detected by the AGATA tracking array. The measured large reduced transition probability B(E3, 19/2(-) -> 13/2(+)) = 40(8) W.u. is the first indication of the octupole phonon at high spin in Pb-207. An analysis in terms of a particle-octupole-vibration coupling model indicates that the measured B(E3) value in Pb-207 is compatible with the contributions from single-phonon and single particle E3 as well as E3 strength arising from the double-octupole-phonon 6(+) state, all adding coherently. A crucial aspect of the coupling model, namely the strong mixing between single-hole and the phonon-hole states, is confirmed in a realistic shell-model calculation. Crown Copyright B.V.

  • 303.
    Satula, Wojtek
    et al.
    KTH, Superseded Departments, Physics.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Comments on the nuclear symmetry energy2003In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 572, no 3-4, p. 152-158Article in journal (Refereed)
    Abstract [en]

    According to standard textbooks, the nuclear symmetry energy originates from the kinetic energy and the interaction itself. We argue that this view requires certain modifications and propose a different scenario. We ascribe the physical origin of the kinetic term to the discreteness of fermionic levels of, in principle arbitrary binary fermionic systems, and relate its mean value directly to the average level density. Physically it connects this part also to the isoscalar interaction which, at least in self-bound systems- like atomic nuclei, decides upon the spatial dimensions of the system. For the general case of binary fermionic systems possible external confining potentials as well as specific boundary conditions will contribute to this part. The reliability of this concept is verified using self-consistent Skyrme-Hartree-Fock calculations.

  • 304. Seliverstov, M. D.
    et al.
    Cocolios, T. E.
    Dexters, W.
    Andreyev, A. N.
    Antalic, S.
    Barzakh, A. E.
    Bastin, B.
    Buescher, J.
    Darby, I. G.
    Fedorov, D. V.
    Fedoseyev, V. N.
    Flanagan, K. T.
    Franchoo, S.
    Fritzsche, S.
    Huber, G.
    Huyse, M.
    Keupers, M.
    Koester, U.
    Kudryavtsev, Yu.
    Marsh, B. A.
    Molkanov, P. L.
    Page, R. D.
    Sjödin, Marica
    KTH, School of Engineering Sciences (SCI), Physics.
    Stefan, I.
    Van de Walle, J.
    Van Duppen, P.
    Venhart, M.
    Zemlyanoy, S. G.
    Charge radii of odd-A Po191-211 isotopes2013In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 719, no 4-5, p. 362-366Article in journal (Refereed)
    Abstract [en]

    Isotope shifts have been measured for the odd-A polonium isotopes Po191-211 and changes in the nuclear mean square charge radii delta < r(2 >) have been deduced. The measurements were performed at CERN-ISOLDE using the in-source resonance-ionization spectroscopy technique. The combined analysis of these data and our recent results for even-A polonium isotopes indicates an onset of deformation already at Po-197,Po-198, when going away from stability. This is significantly earlier than was suggested by previous theoretical and experimental studies of the polonium isotopes. Moreover and in contrast to the mercury isotopes, where a strong odd-even staggering of the charge radii of the ground states was observed by approaching the neutron mid-shell at N = 104, no such effect is present in polonium down to Po-191. Consequently the charge radii of both isomeric and ground states of the odd-A polonium isotopes follow the same trend as the even-A isotopes.

  • 305. SEWERYNIAK, D
    et al.
    CEDERKALL, J
    Cederwall, Bo
    BLOMQVIST, J
    FAHLANDER, C
    JOHNSON, A
    NORLIN, LO
    NYBERG, J
    ATAC, A
    KEREK, A
    KOWNACKI, J
    WYSS, R
    ADAMIDES, E
    GRAWE, H
    IDEGUCHI, E
    JULIN, R
    JUUTINEN, S
    KARCZMARCZYK, W
    MITARAI, S
    PIIPARINEN, M
    SCHUBART, R
    SLETTEN, G
    TORMANEN, S
    VIRTANEN, A
    IN-BEAM SPECTROSCOPY AT THE PROTON-DRIP LINE - FIRST OBSERVATION OF EXCITED-STATES IN SB-106 AND SB-1071994In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 321, no 4, p. 323-328Article in journal (Refereed)
    Abstract [en]

    Neutron deficient nuclei close to Sn-100 have been investigated in-beam using the NORDBALL detector array. A target of Fe-54 was bombarded with a beam of Ni-58 at 270 MeV. Evaporation residues were identified by detecting protons and alpha particles in a 4 pi charged particle multi-detector set-up and neutrons in a 1 pi neutron detector wall in coincidence with gamma rays. Excited states of the proton drip line nucleus Sb-106 and of Sb-107 were identified for the first time. The yrast level schemes constructed from gamma-gamma-particle coincidence and gamma-gamma angular correlation analysis are presented and discussed within the framework of the nuclear shell model.

  • 306.
    Stahl, Clement
    et al.
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    Xue, She-Sheng
    Schwinger effect and backreaction in de Sitter spacetime2016In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 760, p. 288-292Article in journal (Refereed)
    Abstract [en]

    We consider the particle-antiparticle pairs produced by both a strong electric field and de Sitter curvature. We investigate in 1 + 1 D the backreaction of the pairs on the electromagnetic field. To do so we describe the canonical quantization of an electromagnetic field in de Sitter space and add in the Einstein-Maxwell equation the fermionic current induced by the pairs. After solving this equation, we find that the electric field gets either damped or unaffected depending on the value of the pair mass and the gauge coupling. No enhancement of the electromagnetic field to support a magnetogenesis scenario is found. The physical picture is that the Schwinger pairs locally created screen the production and amplification of the electromagnetic field. However, if one considers light bosons created by the Schwinger mechanism, we report a solution to the Einstein-Maxwell equation with an enhancement of the electromagnetic field. This solution could be a new path to primordial magnetogenesis.

  • 307. Sun, M. D.
    et al.
    Liu, Z.
    Huang, T. H.
    Zhang, W. Q.
    Wang, J. G.
    Liu, X. Y.
    Ding, B.
    Gan, Z. G.
    Ma, L.
    Yang, H. B.
    Zhang, Z. Y.
    Yu, L.
    Jiang, J.
    Wang, K. L.
    Wang, Y. S.
    Liu, M. L.
    Li, Z. H.
    Li, J.
    Wang, X.
    Lu, H. Y.
    Lin, C. J.
    Sun, L. J.
    Ma, N. R.
    Yuan, C. X.
    Zuo, W.
    Xu, H. S.
    Zhou, X. H.
    Xiao, G. Q.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Zhang, F. S.
    New short-lived isotope 223Np and the absence of the Z = 92 subshell closure near N = 1262017In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 771, p. 303-308Article in journal (Refereed)
    Abstract [en]

    The N=130 short-lived isotope 223Np was produced as evaporation residue (ER) in the fusion reaction 40Ar + 187Re at the gas-filled recoil separator Spectrometer for Heavy Atom and Nuclear Structure (SHANS). It was identified through temporal and spatial correlations with α decays of 215Ac and/or 211Fr, the third and fourth members of the α-decay chain starting from 223Np. The pileup signals of ER(223Np)–α(223Np)–α(219Pa) were resolved by using the digital pulse processing technique. An α decay with half-life of T1/2=2.15(52100) μs and energy of Eα=9477(44) keV was attributed to 223Np. Spin and parity of 9/2− were tentatively proposed for the ground state of 223Np by combining the reduced α-decay width and large-scale shell-model calculations. This assignment together with the proton separation energy disprove the existence of a Z=92 subshell closure.

  • 308. 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.

  • 309. 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.

  • 310.
    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.

  • 311.
    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.

  • 312. 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.

  • 313.
    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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