Clear signatures of specific inelastic and transfer channels in the distribution of fusion barriers

Morton, Clyde; Dasgupta, M.; Hinde, David; Leigh, J.R.; Lemmon, R. C.; Lestone, J. P.; Mein, J. C.; Newton, J.O.; Timmers, H.; Rowley, N.; Kruppa, A. T.

doi:10.1103/physrevlett.72.4074

Cited by 105 publications

(106 citation statements)

References 10 publications

(13 reference statements)

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“…Other modes of vibrations can also be studied with this technique. In particular, the coupling to low-lying 2 + states associated to collective quadrupole vibrations are known to affect near-barrier fusion [4,31]. However, the low-lying 2 + states of 40 Ca are not found to be collective and the quadrupole strength is essentially located in the giant quadrupole resonance (GQR).…”

Section: Tdhf and CC Calculationsmentioning

confidence: 99%

“…In particular, couplings to rotational states [3], as well as to low-lying collective vibrations [2,[4][5][6], can enhance sub-barrier fusion by orders of magnitude as compared to a single barrier penetration model. Indeed, the couplings to collective states induce a dynamical change of the density and thus different potential barriers can be present in the entrance channel.…”

Section: Introductionmentioning

confidence: 99%

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Microscopic study of the effect of intrinsic degrees of freedom on fusion

Simenel

Dasgupta

Hinde

et al. 2015

EPJ Web of Conferences

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Abstract. Fusion cross-sections are computed for the 40 Ca+ 40 Ca system over a wide energy range with two microscopic approaches where the only phenomenological input is the Skyrme energy density functional. The first method is based on the coupled-channels formalism, using the bare nucleus-nucleus potential calculated with the frozen Hartree-Fock technique and the deformation parameters of vibrational states computed with the time-dependent Hartree-Fock (TDHF) approach. The second method is based on the density-constrained TDHF method to generate nucleus-nucleus potentials from TDHF evolution. Both approaches incorporate the effect of couplings to internal degrees of freedoms in different ways. The predictions are in relatively good agreement with experimental data.

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Section: Tdhf and CC Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microscopic study of the effect of intrinsic degrees of freedom on fusion

Simenel

Dasgupta

Hinde

et al. 2015

EPJ Web of Conferences

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“…This is done by taking two HF ground states for the reaction and putting them in the same calculation box. In this work all frozen HF calculations were made in a box size 67.2 × 22.4 × (2 × 11.2) fm 3 in the x − y − z orientation (z = 0 is a plane of symmetry) where the collision axis is the x−axis. The maximum distance between the centres of masses was 44.8 fm.…”

Section: Numerical Detailsmentioning

confidence: 99%

“…Effects of internal nuclear structure on heavy-ion fusion can be seen by studying features of experimental fusion barrier distributions [1,2]. Experiments have shown that dynamic effects such as low-lying vibrational couplings [3][4][5] and transfer reactions [6][7][8][9][10] strongly affect fusion reactions. Other dynamic effects, such as breakup [11][12][13][14] and rotational couplings [4], have also been seen to play a role.…”

Section: Introductionmentioning

confidence: 99%

Nuclear structure effects on heavy-ion reactions with microscopic theory

2016

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Abstract. The self-consistent mean-field Hartree-Fock (HF) theory, both static and time-dependent (TDHF) versions, is used to study static and dynamic properties of fusion reactions between even 40−54 Ca isotopes and 116 Sn. The bare nucleus-nucleus potential, calculated with the frozen HF approach, is affected by the groundstate density of the nuclei. However, once dynamical effects are included, as in TDHF, the static effects on the barrier are essentially washed out. Dynamic properties of the nuclei, including low-lying vibrational modes, are calculated with TDHF and selectively used in coupled-channels calculations to identify which modes have the most effect on the TDHF fusion threshold. Vibrations cannot fully explain the difference between the static HF and TDHF fusion barriers trend so other dynamical effects such as transfer are considered.

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“…Our understanding of the fusion reactions between the strongly-bound as well as weakly-bound nuclei have been enriched due to the continuous efforts devoted by nuclear community in the field of theory [1][2][3][4][5][6][7][8][9][10] and experiments [11][12][13][14][15]. The knowledge of the mechanism of heavyion fusion reaction is very crucial to explore the nucleusnucleus potential as well as for the synthesis of super heavy elements.…”

Section: Introductionmentioning

confidence: 99%

A new technique to determine fusion barrier heights using proximity potentials

Kumari

Toshniwal

2015

EPJ Web of Conferences

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Abstract. We develop a new technique to calculate fusion barrier heights of any fixed target reaction series. We calculate the barrier heights for the fusion reactions of 119 Sn and 197 Au targets using this technique. This technique is simple and very useful for estimating the fusion barrier heights for those reactions for which empirical values are not available. A formula is derived by performing theoretical calculations using different versions of proximity potential. Using this formula, we can predict the barrier height for the fusion reaction of any projectile with 119 Sn or 197 Au target using the empirical barrier height for the fusion reaction of same projectile with 62 Ni target. In order to check the accuracy of this technique, the fusion parameters calculated by this new technique are compared with the fusion parameters calculated by using parameterized formulae presented in a systematic study conducted by using double folding model.

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Clear signatures of specific inelastic and transfer channels in the distribution of fusion barriers

Cited by 105 publications

References 10 publications

Microscopic study of the effect of intrinsic degrees of freedom on fusion

Microscopic study of the effect of intrinsic degrees of freedom on fusion

Nuclear structure effects on heavy-ion reactions with microscopic theory

A new technique to determine fusion barrier heights using proximity potentials

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