Role of break-up processes in the fusion of the {sup 12}C+ {sup 52}Cr system

Journal Article · Mon Aug 15 04:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.84.024614· OSTI ID:21596678

Amanuel, F K ^[1]; Zelalem, B; Chaubey, A K ^[2]; Agarwal, Avinash ^[3]; Rizvi, I A; Maheshwari, Anjana; Ahmed, Tauseef ^[4]

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1. INFN, Laboratori Nazionali di Legnaro, Legnaro (Padova) (Italy)
2. Department of Physics, Addis Ababa University, P.O. Box 1176, Addis Ababa (Ethiopia)
3. Department of Physics, Bareilly College, Bareilly 243005 (India)
4. Department of Physics, Aligarh Muslim University, Aligarh 202002 (India)

We present the results and analysis of our investigation of the role of break-up processes on the fusion of a {sup 12}C{sup 6+} beam with a {sup 52}Cr target near, at, and above the Coulomb barrier. In this experiment the excitation functions of evaporation residues produced via ({sup 12}C, 2n), ({sup 12}C, pxn), ({sup 12}C, {alpha}xn), and ({sup 12}C, {alpha}pxn) channels in a {sup 12}C + {sup 52}Cr reaction were measured at several beam energies ranging from {approx_equal}51 to 87 MeV by employing the recoil catcher technique followed by off-line {gamma}-ray spectrometry. The measured excitation functions were compared with theoretical values obtained using the pace4 statistical model code. Further, for a ({sup 12}C, p2n) channel the measured excitation function was compared with the predictions of the alice-91 code, which was chosen as it takes into account pre-equilibrium emissions. For non-{alpha}-emitting channels, the experimentally measured excitation functions--after correcting them for possible contributions from higher charge isobaric precursor decays--were, in general, found to be in good agreement with theoretical predictions. However, for {alpha}-emitting channels, the measured excitation functions had significantly more production cross sections than what pace4 predicted. This enhancement may be attributed to incomplete fusion processes. An attempt was made to estimate the incomplete fusion fraction in order to compare the relative importance of complete and incomplete fusion processes. The incomplete fusion fraction was found to be sensitive to the projectile energy and mass asymmetry of the entrance channel. We also discuss the results in terms of the impact of the frozen {alpha}-cluster structure of the {sup 12}C isotope on various fusion reactions.

• OSTI ID: 21596678
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 84; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALICE
ASYMMETRY
CARBON 12 REACTIONS
CHROMIUM 52 TARGET
COMPARATIVE EVALUATIONS
COULOMB FIELD
CROSS SECTIONS
DECAY
DIFFERENTIAL CROSS SECTIONS
ELECTRIC FIELDS
EMISSION
ENERGY RANGE
EQUILIBRIUM
EVALUATION
EVAPORATION
EXCITATION FUNCTIONS
FUNCTIONS
HEAVY ION REACTIONS
MAGNETIC MIRRORS
MASS
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
NUCLEAR DECAY
NUCLEAR REACTIONS
OPEN PLASMA DEVICES
PHASE TRANSFORMATIONS
PRECURSOR
SPECTROSCOPY
STATISTICAL MODELS
TARGETS
THERMONUCLEAR DEVICES