276 research outputs found

    Charm and Beauty in Particle Physics

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    The spectra of states containing charmed and beauty quarks, and their regularities, are reviewed.Comment: 29 pages, LaTeX, 10 EPSF figures submitted separately. Presented at CERN in September, 1994 at a symposium in honor of Andre Martin To be submitted to Comments on Nuclear and Particle Physic

    Enhanced Fusion-Evaporation Cross Sections in Neutron-Rich 132^{132}Sn on 64^{64}Ni

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    Evaporation residue cross sections have been measured with neutron-rich radioactive 132^{132}Sn beams on 64^{64}Ni in the vicinity of the Coulomb barrier. The average beam intensity was 2×1042\times 10^{4} particles per second and the smallest cross section measured was less than 5 mb. Large subbarrier fusion enhancement was observed. Coupled-channels calculations taking into account inelastic excitation and neutron transfer underpredict the measured cross sections below the barrier.Comment: 4 pages including 1 table and 3 figure

    Fusion of radioactive 132^{132}Sn with 64^{64}Ni

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    Evaporation residue and fission cross sections of radioactive 132^{132}Sn on 64^{64}Ni were measured near the Coulomb barrier. A large sub-barrier fusion enhancement was observed. Coupled-channel calculations including inelastic excitation of the projectile and target, and neutron transfer are in good agreement with the measured fusion excitation function. When the change in nuclear size and shift in barrier height are accounted for, there is no extra fusion enhancement in 132^{132}Sn+64^{64}Ni with respect to stable Sn+64^{64}Ni. A systematic comparison of evaporation residue cross sections for the fusion of even 112−124^{112-124}Sn and 132^{132}Sn with 64^{64}Ni is presented.Comment: 9 pages, 11 figure

    High-precision B(E2) measurements of semi-magic Ni 58,60,62,64 by Coulomb excitation

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    High-precision reduced electric-quadrupole transition probabilities B(E2;01+→21+) have been measured from single-step Coulomb excitation of semi-magic Ni58,60,62,64 (Z=28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the
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