Emission of high-energy charged particles at 0° in Ne-induced reactions

Borcea, C.; Gierlik, É.; Калинин, А.; Kalpakchieva, R.; Oganessian, Yu. Ts.; Pawłat, T.; Penionzhkevich, Yu. É.; Rykhlyuk, A.V.

doi:10.1016/0375-9474(82)90623-6

Cited by 27 publications

(16 citation statements)

References 18 publications

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“…In this example, 20 10 Ne is used as a test case because this nucleus has been used as a complex projectile in several ICF experiments [12][13][14][15]. Figures 4(a), 4(b), and 4(c) represent the PDF associated with the first, second, and third energy eigenvalues, respectively, for the fragmentation of 20 10 Ne in the 044604-4…”

Section: Finite-difference Methodsmentioning

confidence: 99%

“…This work is experimentally motivated: the observation of energetic α particles at forward angles in reactions induced by heavy ions at Coulomb energies [12][13][14][15] indicates the existence of a reaction mechanism in which, following projectile breakup, the α particle carries away most of the bombarding energy of the projectile, leaving the other remaining projectile fragment to be captured by the target resulting in a colder fusion product than would typically be achieved via the CF mechanism (with higher excitation energy). The low excitation energy of these cold products from ICF reactions results in both a higher survivability against fission and fewer neutrons evaporated, indicating that this mechanism could be a successful way of producing relatively stable SHE isotopes.…”

Section: Introductionmentioning

confidence: 99%

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Modelling incomplete fusion dynamics of complex nuclei at Coulomb energies

Bossche

Díaz-Torres

2019

Phys. Rev. C

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The incomplete fusion dynamics of 20 10 Ne + 208 82 Pb collisions at energies above the Coulomb barrier are investigated using a novel semiclassical dynamical model, which combines a classical trajectory model with stochastic breakup, as implemented in the PLATYPUS code, with a dynamical fragmentation theory treatment of two-body clusterization and decay of a projectile. A finite-difference method solution to the time-independent Schrödinger equation in the charge asymmetry coordinate is employed by way of diagonalizing a tridiagonal Hamiltonian matrix with periodic boundary conditions. Results are compared with published experimental values to indicate the success of this new model, and next steps for its development are detailed.

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Section: Finite-difference Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling incomplete fusion dynamics of complex nuclei at Coulomb energies

Bossche

Díaz-Torres

2019

Phys. Rev. C

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“…Here we have to take into account that the assumption of a fixed excitation energy of a specific ICN, which consequently would require a constant energy loss of the projectiles is just a simplification of the real facts. Experimentally broad energy distributions of projectile fragments have been observed [8,12,26], which vice versa indicate fluctuations of energy losses of the projectiles.…”

Section: Ill3 Comparison With the Sum-rule Modelmentioning

confidence: 95%

?Slow? residues observed in the reaction20Ne+208Pb at E/A=8.6, 11.4 and 15.0 MeV/u

Heßberger

Ninov

Hofmann

et al. 1994

Z. Physik A - Hadrons and Nuclei

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Abstract. Velocity distributions of heavy residues ARes>Atar, ZRe s>Zta r identified by means of c~ spectroscopy, have been investigated at the velocity filter SHIP in reactions 2~ +2~ at projectile energies E/ A=8.6, 11.4 and 15.0MeV/u. Besides products from complete or nearly complete fusion, characterized by velocity distributions peaking at V/VcN~0.8-1.O, heavy residues with mean velocities of about half of the compound nucleus velocity were observed. The Z-distribution of this component was found to peak at Z = 87. It is interpreted as residues from fusion of target nuclei with projectile fragments produced by nearly symmetric break-up. The experimental results were compared with predictions of theoretical models: cross sections for incomplete fusion were calculated using the sum-rule model of Wilcynski et al., while residue cross sections were calculated using the evaporation code HIVAP. A fair agreement between experimental and calculated mass distributions of heavy residues and transferred projectile fragments is achieved if an energy dissipation of -~ 23 % (at E/A = 8.6 MeV/u) and ~ 8% (at E/A = 11.4 MeV/u) of the incident projectile energy is introduced. The observed peak of the Z-distribution at Z = 87 is predominantly effected due to a higher fission probability of products with Z>87 during the deexcitation process and experimental limitations in the identification of products with Z < 86 by means of ~ spectroscopy, which cause a decrease of the observed production rates towards lower Z.

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“…In heavy ion reactions light charged particles are emitted with cross sections, which constitute a significant part of the geometrical cross section of the reaction [1,2,3], particularly in the case of α -particles. The measured energy spectra, angular distributions and cross sections of these particles are not describable in the framework of the evaporation model of compound nucleus decay.…”

Section: Introductionmentioning

confidence: 99%

“…The measured energy spectra, angular distributions and cross sections of these particles are not describable in the framework of the evaporation model of compound nucleus decay. The noticeable increase in the yields of energetic light particles, as well as their strongly forward-peaked angular distributions, suggest a fast mechanism of their formation [2,3]. The experimental investigation of α -particle spectra as a function of momentum transfer, reported in [2,3], convincingly shows that the emission of fast particles takes place during the early stages of the reaction, when the final fate of the interacting nuclei is yet not determined.…”

Section: Introductionmentioning

confidence: 99%

α-particle emission in the reaction 48Ca+Ta at Coulomb energy

Mendibaev¹,

Hue²,

Lukyanov³

et al. 2017

Self Cite

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Inclusive energy spectra have been measured for light charged particles emitted in the bombardment of Ta target by 48 Ca ions at 261 MeV and 471 MeV. The reaction products were analyzed and detected by means of a (∆E × E) telescope placed in the focal plane of a magnetic spectrometer located at forward angles with respect to the beam direction. In all the reactions studied light charged particles with an energy close to the respective calculated kinematic limit for a two-body exit channel are produced with relatively great probability. The results obtained make it possible to draw some conclusions about the reaction mechanism involving the emission of light charged particles.

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Emission of high-energy charged particles at 0° in Ne-induced reactions

Cited by 27 publications

References 18 publications

Modelling incomplete fusion dynamics of complex nuclei at Coulomb energies

Modelling incomplete fusion dynamics of complex nuclei at Coulomb energies

?Slow? residues observed in the reaction20Ne+208Pb at E/A=8.6, 11.4 and 15.0 MeV/u

α-particle emission in the reaction 48Ca+Ta at Coulomb energy

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