Excitation functions for production of heavy residues in the interaction of12C with181Ta

Crippa, M.; Gadioli, E.; Vergani, P.; Ciavola, G.; Marchetta, C.; Bonardi, M.

doi:10.1007/bf01290680

Cited by 45 publications

(42 citation statements)

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“…As such, due to the unavailability of any reliable theoretical model to fit the experimental data obtained at energies ≈ 5-7 MeV/nucleon, the study of ICF is still an active area of investigations. Furthermore, there is a renewed interest in the study of ICF dynamics after observation of these reactions at relatively low bombarding energies [30][31][32][33]. Moreover, the ICF reactions are considered to be a promising route to produce high spin states even at low bombarding energies [34,35].…”

Section: Introductionmentioning

confidence: 98%

Observation of large incomplete fusion in 16O + 103Rh system at

Gupta

Singh

et al. 2008

Nuclear Physics A

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Section: Introductionmentioning

confidence: 98%

Observation of large incomplete fusion in 16O + 103Rh system at

Gupta

Singh

et al. 2008

Nuclear Physics A

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“…The observed familiar fusion or fusion-like phenomena at the low energy nuclear reaction mechanisms such as complete fusion (CF), incomplete fusion (ICF), and direct reaction (DR) have been extensively studied in the heavy mass target region [1][2][3][4][5][6][7][8][9][10][11]. Fusion between two nuclei may occur when the projectile overcomes barriers resulting from the long-range repulsive Coulomb potential and reach the short-range attractive nuclear potential.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the absence of satisfactory theoretical models, investigated exper imental data of reaction cross sections may help in elucidating the important parameters that must be included in the modeling of CF and ICF processes. Most of the experimental studies have been confined to heavier mass target nuclei [1][2][3][4][5][6][7][8][9][10][11]; however, in the lower mass region, the experimental data are much less [22,23], With this motivation, in the present work the measurement and analysis of the excitation functions (EFs) for reactions produced in the I2C + 27A1 system have been carried out in the energy range from «*39 to 85 MeV, using off-beam y-ray spectrometry. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of cross sections in theC12+Al27system at
Sharma¹,
Yadav
²
,
Sharma
³

et al. 2015
Phys. Rev. C

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Background:The reaction mechanism in the low mass region particularly at low projectile energies in heavy-ion fusion processes has not been fully understood. More and more experimental data on fusion processes are required for the accurate description of reaction processes involved at low projectile energies. In the literature, cross section data for the fusion process using a l2C beam in the lower mass region and at low projectile energies are scarce. Purpose: To understand the dynamics of fusion processes and to test various existing theoretical models, the measurements of reaction cross sections in the l2C + 27AI system have been carried out. Method:The experiments were performed for the measurement of the cross sections for the residues produced in the interaction of the l2C ion with a 27A1 target nucleus at 20 different energies covering the energy range from «^39 to 85 MeV. The off-line y-ray spectrometry based activation technique has been used to measure the cross sections. Results: The measured excitation functions were compared to those evaluated with the code p a c e 4 based on the statistical approach and Monte Carlo procedure. The enhancement of experimental cross sections as compared to the theoretical predictions of code PACE4 has been observed. The SUMRULE model predictions indicate that incomplete fusion processes are associated with smaller values of the angular momenta than that of its critical value required for complete fusion processes. Conclusions: In the lower mass region, phenomena such as incomplete fusion and direct reaction processes are of importance even at energies as low as « 3 -7 MeV/nucleon, where fusion evaporation channels are expected to be dominant.

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“…Observations show that at incident projectile energies above the Coulomb barrier, the dominant nuclear reaction mechanisms are complete fusion (CF) and the ICF [6][7][8][9]. Efforts are in progress to gain better understanding of ICF processes.…”

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confidence: 98%

Incomplete fusion dynamics by spin distribution measurements

et al. 2010

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Spin distributions for various evaporation residues populated via complete and incomplete fusion of 16 O with 124 Sn at 6.3 MeV/nucleon have been measured, using charged particles (Z = 1, 2)-γ coincidence technique. Experimentally measured spin distributions of the residues produced as incomplete fusion products associated with "fast" α-and 2α-emission channels observed in the "forward cone" are found to be distinctly different from those of the residues produced as complete fusion products. Moreover, "fast" α-particles that arise from larger angular momentum in the entrance channel are populated at relatively higher driving input angular momentum than those produced through complete fusion. The incomplete fusion residues are populated in a limited, higher-angular-momentum range, in contrast to the complete fusion products, which are populated over a broad spin range.The study of incomplete fusion (ICF) of heavy ions with different targets has been a topic of renewed interest at energies above the Coulomb barrier [1][2][3][4][5]. Observations show that at incident projectile energies above the Coulomb barrier, the dominant nuclear reaction mechanisms are complete fusion (CF) and the ICF [6-9]. Efforts are in progress to gain better understanding of ICF processes. Britt and Quinton [10] first observed the production of forward-peaked "fast" α particles in the breakup of the projectiles 12 C, 14 N and 16 O at ≈10.5 MeV/nucleon energy. Advances in the understanding of ICF dynamics were made after the charged particle-γ coincidence measurements by Inamura et al. [11]. Semiclassical theory of heavy ion (HI) interaction categorizes the CF and ICF processes on the basis of driving input angular momentum imparted in the system. In the CF process the driving input angular momentum 0 crit , in accordance with a sharp cutoff approximation [12][13][14] and may be understood in the following way: In CF, the attractive nuclear potential overcomes the repulsive Coulomb and centrifugal potentials in central and near-central collisions. Consequently, CF takes place at a small impact parameter value at which the formation of fully equilibrated compound nucleus (CN) takes place. However, at relatively higher values of impact parameter, the repulsive centrifugal potential increases and hence the dominance of attractive nuclear potential ceases to capture the entire projectile. Therefore, an incompletely fused composite system comprising a part of a projectile plus the target appears in the exit channel that leads to the ICF process, wherein the involvement of driving input angular momentum is relatively larger than that needed for the CF process to take place. At this stage if the driving input angular momentum exceeds the critical limit ( crit ) for CF, no fusion can occur unless a part of the projectile is emitted to release excess driving input angular momentum. As such, prompt emission of a part of the projectile (predominantly α clusters in 12 C, 16 O and 20 Ne beam) takes place to provide sustainable input angular momenta to t...

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Excitation functions for production of heavy residues in the interaction of12C with181Ta

Cited by 45 publications

References 20 publications

Observation of large incomplete fusion in 16O + 103Rh system at

Observation of large incomplete fusion in 16O + 103Rh system at

Experimental study of cross sections in theC12+Al27system at
Sharma¹,
Yadav
²
,
Sharma
³

et al. 2015
Phys. Rev. C

Incomplete fusion dynamics by spin distribution measurements

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Excitation functions for production of heavy residues in the interaction of12C with181Ta

Cited by 45 publications

References 20 publications

Observation of large incomplete fusion in 16O + 103Rh system at

Observation of large incomplete fusion in 16O + 103Rh system at

Experimental study of cross sections in theC12+Al27system atSharma1, Yadav2, Sharma3 et al. 2015Phys. Rev. C

Incomplete fusion dynamics by spin distribution measurements

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Product

Resources

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Experimental study of cross sections in theC12+Al27system at
Sharma¹,
Yadav
²
,
Sharma
³

et al. 2015
Phys. Rev. C