Fusion cross sections for the Be9+Sn124 reaction at energies near the Coulomb barrier

Physical Review C (Impact Factor: 3.88). 01/2010; 82. DOI: 10.1103/PhysRevC.82.054601

ABSTRACT The complete and incomplete fusion cross sections for Be9+Sn124 reaction have been deduced using the online gamma-ray measurement technique. Complete fusion at energies above the Coulomb barrier was found to be suppressed by ~28% compared to the coupled-channels calculations and is in agreement with the systematics of L. R. Gasques [Phys. Rev. CPRVCAN0556-281310.1103/PhysRevC.79.034605 79, 034605 (2009)]. Study of the projectile dependence for fusion on a Sn124 target shows that, for Be9 nuclei, the enhancement at below-barrier energies is substantial compared to that of tightly bound nuclei.

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    ABSTRACT: Fission fragment (FF) angular distributions for 6,7 Li + 235,238 U reactions have been measured at energies near and above the Coulomb barrier. The angle integrated fission cross sections for 6 Li induced reactions at sub-barrier energies are found to be higher than 7 Li induced reactions possibly due to a larger contribution of breakup or transfer induced fission in cases of the former compared to the latter. The FF anisotropies for 6,7 Li+235 U are found to be slightly smaller than 6,7 Li+238 U, manifesting the effect of target spin. The statistical saddle point model predictions underestimate the measured FF anisotropy for all four systems at measured energies. Anisotropy calculation by entrance channel dependent K-state distribution model and determination of 2 from continuum discretized coupled channels calculations suggest that the above enhancement in experimental anisotropy is due to a combined effect of entrance channel dependent pre-equilibrium fission and projectile breakup induced fission.
    Physical Review C 01/2014; 90:014603. DOI:10.1103/PhysRevC.90.014603 · 3.88 Impact Factor
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    ABSTRACT: A large number of complete fusion excitation functions of reactions including the breakup channel were measured in recent decades, especially in the last few years. It allows us to investigate the systematic behavior of the breakup effects on the complete fusion cross sections. To this end, we perform a systematic study of the breakup effects on the complete fusion cross sections at energies above the Coulomb barrier. The reduced fusion functions $F(x)$ are compared with the universal fusion functions which are used as a uniform standard reference. The complete fusion cross sections at energies above the Coulomb barrier are suppressed by the breakup of projectiles. This suppression effect for reactions induced by the same projectile is independent of the target and mainly determined by the lowest energy breakup channel of the projectile. There holds a good exponential relation between the suppression factor and the energy corresponding to the lowest breakup threshold.
    Physical Review C 07/2014; 90(3). DOI:10.1103/PhysRevC.90.034612 · 3.88 Impact Factor
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    ABSTRACT: The role of the breakup process and one neutron stripping on the near barrier fusion are investigated for the weakly bound projectile $^{9}$Be on $^{28}$Si, $^{89}$Y, $^{124}$Sn, $^{144}$Sm and $^{208}$Pb targets. Continuum-discretized coupled channels (CDCC) calculations for the breakup with a $^{8}$Be + n model of the $^{9}$Be nucleus and coupled reactions channels (CRC) calculations for the one neutron stripping to several single particle states in the target are performed for these systems. A good description of the experimental fusion cross sections above the Coulomb barrier is obtained from the CDCC-CRC calculations for all the systems. The calculated incomplete fusion probabilities for different target systems are found to be consistent with the systematic behaviour of the complete fusion suppression factors as a function of target atomic mass, obtained from the experimental data.
    Physical Review C 02/2014; 89(3). DOI:10.1103/PhysRevC.89.034605 · 3.88 Impact Factor


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May 26, 2014