Cross sections and average angular momenta in the fusion of 28Si+94,100Mo and 58,64Ni+64Ni

Ackermann, D.; Bednarczyk, P.; Corradi, L.; Napoli, D. R.; Petrache, C. M.; Spolaore, P.; Stefanini, A. M.; Varier, K. M.; Zhang, H.; Scarlassara, F.; Beghini, S.; Montagnoli, G.; Müller, L.; Segato, G. F.; Soramel, F.; Signorini, C.

doi:10.1016/0375-9474(96)00282-5

Cited by 51 publications

(28 citation statements)

References 41 publications

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“…The ATLAS data for this case are in a good agreement with previous results [56] at energies above the Coulomb barrier but not around and below the barrier.…”

Section: Ni+ 58 Nisupporting

confidence: 91%

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Signature of shallow potentials in deep sub-barrier fusion reactions

2007

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We extend a recent study that explained the steep falloff in the fusion cross section at energies far below the Coulomb barrier for the symmetric dinuclear system 64 Ni+ 64 Ni to another symmetric system, 58 Ni+ 58 Ni, and the asymmetric system 64 Ni+ 100 Mo. In this scheme the very sensitive dependence of the internal part of the nuclear potential on the nuclear equation of state determines a reduction of the classically allowed region for overlapping configurations and consequently a decrease in the fusion cross sections at bombarding energies far below the barrier. Within the coupled-channels method, including couplings to the low-lying 2 + and 3 − states in both target and projectile as well as mutual and two-phonon excitations of these states, we calculate and compare with the experimental fusion cross sections, S-factors, and logarithmic derivatives for the above mentioned systems and find good agreement with the data even at the lowest energies. We predict, in particular, a distinct double peaking in the S-factor for the far subbarrier fusion of 58 Ni+ 58 Ni which should be tested experimentally.

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“…The ATLAS data for this case are in a good agreement with previous results [56] at energies above the Coulomb barrier but not around and below the barrier.…”

Section: Ni+ 58 Nisupporting

confidence: 91%

“…10, where the measurements of the γ-ray multiplicity from the compound nucleus formed in the fusion of 64 Ni+ 64 Ni have been converted into an average angular momentum for fusion [56]. The thin dashed curve shows the prediction based on the AW potential in the no-coupling limit (NOC (AW)).…”

Section: B Average Spin For Fusionmentioning

confidence: 99%

Signature of shallow potentials in deep sub-barrier fusion reactions

2007

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“…Indeed these were the pioneering experiments of Beckerman et al (1980) where the enhancement of subbarrier fusion cross sections was first observed. These cross sections were later measured by Schicker et al (1988) and more recently by Ackermann et al (1996). The cross sections measured by Ackermann et al (1996) for the 58 Ni+ 64 Ni and 64 Ni+ 64 Ni systems are displayed in Figure 9, where the energies are normalized to the height of the s-wave potential barrier.…”

Section: B Nucleon Transfermentioning

confidence: 99%

“…These cross sections were later measured by Schicker et al (1988) and more recently by Ackermann et al (1996). The cross sections measured by Ackermann et al (1996) for the 58 Ni+ 64 Ni and 64 Ni+ 64 Ni systems are displayed in Figure 9, where the energies are normalized to the height of the s-wave potential barrier. One sees a discernible enhancement for the 58 Ni+ 64 Ni system over the 64 Ni+ 64 Ni system.…”

Section: B Nucleon Transfermentioning

confidence: 99%

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Quantum tunneling in nuclear fusion

1998

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Recent theoretical advances in the study of heavy ion fusion reactions below the Coulomb barrier are reviewed. Particular emphasis is given to new ways of analyzing data, such as studying barrier distributions; new approaches to channel coupling, such as the path integral and Green function formalisms; and alternative methods to describe nuclear structure effects, such as those using the Interacting Boson Model. The roles of nucleon transfer, asymmetry effects, higher-order couplings, and shape-phase transitions are elucidated. The current status of the fusion of unstable nuclei and very massive systems are briefly discussed.

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