Suppression of complete fusion in the {sup 6}Li+{sup 144}Sm reaction

Journal Article · Fri May 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.79.051601· OSTI ID:21286920

Rath, P K; Singh, N L; Mukherjee, S; Appannababu, S ^[1]; Santra, S; Parkar, V V; Nayak, B K; Mahata, K; Choudhury, R K ^[2]; Tripathi, R ^[3]; Palit, R; Kumar, Suresh ^[4]

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1. Department of Physics, M. S. University of Baroda, Vadodara-390002 (India)
2. Nuclear Physics Division, Bhabha Atomic Research Centre, Mumbai-400085 (India)
3. Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai-400085 (India)
4. Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai-400005 (India)

Complete fusion excitation function for the {sup 6}Li+{sup 144}Sm reaction has been measured at near barrier energies by the activation technique. Coupled-channel calculations show an enhancement in fusion cross section at energies below the barrier compared to the one-dimensional barrier penetration model calculation, but they overpredict it in the entire energy range compared to the experimental data. Reduced fusion cross sections for the present system at energies normalized to the Coulomb barrier were also found to be systematically lower than those with strongly bound projectiles forming a similar compound nucleus. These two observations conclusively show that the complete fusion cross section, at above barrier energies, is suppressed by {approx}32% in the {sup 6}Li+{sup 144}Sm reaction. Reanalyses of existing fusion data for {sup 7}Li+{sup 165}Ho and {sup 7}Li+{sup 159}Tb also show a suppression compared to those with strongly bound projectiles, which contradicts earlier conclusions. The fusion suppression factor seems to exhibit a systematic behavior with respect to the breakup threshold of the projectile and the atomic number of the target nucleus.

• OSTI ID: 21286920
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOMIC NUMBER
COMPOUND NUCLEI
COULOMB FIELD
COUPLED CHANNEL THEORY
ENERGY RANGE
EXCITATION FUNCTIONS
HOLMIUM 165
LITHIUM 6
LITHIUM 7
NUCLEAR REACTIONS
ONE-DIMENSIONAL CALCULATIONS
PROJECTILES
SAMARIUM 144
SIMULATION
TERBIUM 159