Evolution from deep inelastic transfer to quasi-fission

Rivet, M. F.; Bimbot, R.; Fleury, A.; Llabador, Y.

doi:10.1016/0375-9474(77)90164-6

Cited by 16 publications

(16 citation statements)

References 17 publications

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“…In that sense, they are different from the reactions usually studied, and it was interesting to investigate their characteristics. Part of these results have already been published [18][19][20]. They concern the Ar induced reactions, and the 4-charge transfer reactions induced by Cu and Fe ions.…”

Section: Introductionmentioning

confidence: 72%

Deeply inelastic transfer reactions induced by heavy ions in rare-earth targets

et al. 1980

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Recoil techniques have been used for a systematic study of deeply inelastic transfer reactions induced in rare earth targets by 4~ 52Cr, 56Fe and 63Cu projectiles. The targets were separated isotopes of Eu, Sin, Nd and Pr. The residual nuclei 149gTb, 15~ and a 51Dy were identified by their radioactive properties. The reactions studied involved the transfer of 3 to 7 charges from projectile to target. The c.m. angular and energy distributions were measured over the whole angular range from 0 to 180 ~ (c.m.). A special device was used to measure accurately the c.m. energy of products emitted in the angular range 170-180 ~ in the c.m.s. The c.m. angular distributions depend strongly on the ratio of the incident energy to the strong interaction barrier, and slightly on the number of transferred charges. The c.m. energy distributions are typical of completely damped collisions for 6-charge transfer reactions, and include a contribution of partially damped collisions for 4-charge transfer reactions. A kinematic analysis was used to determine the most probable number of neutrons transferred in the first reaction step with a given number of protons. The numbers found correspond to equilibration of the neutron to proton ratio in the composite system.

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Section: Introductionmentioning

confidence: 72%

Deeply inelastic transfer reactions induced by heavy ions in rare-earth targets

et al. 1980

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“…This may explain a difference of about 1 fm in favour of the present value. Secondly, as was outlined in [10,14] Finally, one should remark that the hypothesis of rolling is difficult to reconcile with a strong deformation of the composite system at scission. For the angular momentum calculations, it has been associated with the hypothesis of two tangent spheres.…”

Section: Iv22 System 4~ + 144smmentioning

confidence: 98%

“…If one neglects the deformation effects, the deexcitation of an excited Dy or Tb fragment, after separation from the light one, can be treated in the same way as that of an identical nucleus produced through a fusion reaction, the only possible difference being the initial population of excitation energy E* and angular momentum J. The excitation energies of the Tb fragments produced in the present experiment can be calculated from the kinetic energy measured for the Tb residues, assuming a two-body process and a sharing of the excitation energies between the fragments proportionally to their masses [8][9][10]. Such calculations lead to E* values lying in the range 30-60MeV according to the incident energy for the projectiles 4~ and 63Cu.…”

Section: Interpretation In Terms Of Tb Fragment Angular Momentamentioning

confidence: 99%

“…produced by deep inelastic reactions have been measured using activation techniques as described in [8][9][10]. The projectiles used, r176 and 63Cu, were accelerated with the Orsay ALICE facility.…”

Section: Ii1 Experimental Techniquementioning

confidence: 99%

“…reactions. The present work is another approach to this problem, which consists in studying the heavy fragment angular momentum through the production yield of a low spin isomer 149gTb: Deep inelastic reactions in which two to six charges are transferred from Ar and Cu ions to rare earth targets have been studied by observing the heavy residues 151Dy, 15~ and 149gTb, these nuclei being identified by their ~-radioactivity as in [8][9][10]. The corresponding excitation functions have been measured and compared to each other.…”

Section: Introductionmentioning

confidence: 99%

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Production of149gTb in deep inelastic transfer reactions: An approach to the angular momentum of fragments

et al. 1979

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The excitation functions for deep inelastic reactions in which two to six charges are transferred from 4~ and 63Cu ions to rare earth targets have been measured using activation techniques, the observed radionuclides being 150, 151Dy and 149gTb. From the comparison of the curves relative to 149gTb and those relative to 15~ it was deduced that the low spin isomer 149gTb was produced with significant probability for low incident energies. Using data from (heavy ions, xn) reactions, it was possible to attribute this production to the deexcitation of Tb fragments formed in deep inelastic transfers with angular momenta lower than 9 h. This result is in good agreement with the angular momentum calculations performed under the hypothesis that the initial angular momentum window leading to deep inelastic reactions is situated between the critical angular momentum for fusion and that corresponding to grazing collisions. As far as Cu induced reactions are concerned, both hypothesis of rolling and sticking are consistent with the experimental data. For Ar induced reactions, the results indicate that the stage of sticking is not reached when the incident energy is lower than 200 MeV.Nuclear Reactions: 142'145Nd, 144'a48Sm, 154Gd(Ar, X)151'lS~ 149gTb E=160 280MeV; measured a(E). ~44Nd, 14SSm, 151Eu, 154Gd(Cu, X)1~1' 15~ 149gTb. E=280-420 MeV measured a(E). Enriched targets. Deduced angular momentum of Tb fragments.

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Damped Nuclear Reactions

Schröder¹,

Huizenga²

1984

Treatise on Heavy-Ion Science

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Evolution from deep inelastic transfer to quasi-fission

Cited by 16 publications

References 17 publications

Deeply inelastic transfer reactions induced by heavy ions in rare-earth targets

Deeply inelastic transfer reactions induced by heavy ions in rare-earth targets

Production of149gTb in deep inelastic transfer reactions: An approach to the angular momentum of fragments

Damped Nuclear Reactions

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