Sub-barrier fusion of neutron-rich nuclei and its astrophysical consequences

Zagrebaev, V. I.; Самарин, В. В.; Greiner, Walter

doi:10.1103/physrevc.75.035809

Cited by 88 publications

(99 citation statements)

References 46 publications

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“…4. The near barrier neutron transition with 0 Q > from the 1d 5/2 ( 18 O) state to the low-lied 1g 9/2 ( 58 Ni) state is, in a certain sense, an "energy lift" for the two interacting nuclei [1]. The total barrier penetration probability and the fusion cross section may increase due to a gain in the relative motion energy in this case.…”

Section: The Neutrons Rearrangement In the Centralmentioning

confidence: 94%

“…The numerical solving of the time-dependent Schrödinger equation (TDSE) provides new possibilities for theoretical study of transfer reactions and the first capture stage of fusion reactions [1]. In this study the spin-orbital interaction [2], two-center states [3][4][5][6], the Pauli's exclusion principle [7] and the shell structure of deformed nuclei [8,9] were taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

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Time-dependent quantum models of the dynamics of neutron transfer reactions near the barrier

Самарин

2015

EPJ Web of Conferences

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Section: The Neutrons Rearrangement In the Centralmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Time-dependent quantum models of the dynamics of neutron transfer reactions near the barrier

Самарин

2015

EPJ Web of Conferences

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“…Coupling channel Results of calculations by formulas (2), (3), (14) with the proximity potential for the fusion cross section s and channel functions , , ( ) (Fig. 8) and coefficients a a of series expansion of the time-dependent valence neutron wave function ( , ) t Y r [9,12,13] for the head-on nucleus-nucleus collision occurs for the coupling strength value 15 t F = . In the vicinity of the Coulomb barrier the transition between two-center energy levels from the 1d 5/2 (O) to 1g 9/2 (Ni) with ( ) …”

Section: The Neutron Transfer Channels Couplingmentioning

confidence: 99%

Coupling with two-center neutron states and two-surface collective excitations at fusion reactions in the vicinity of the Coulomb barrier

Самарин

2015

EPJ Web of Conferences

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Abstract.A clear physical interpretation of barrier distribution peaks and depressions is proposed. It is based on distance dependent vibration excitation energies near the barrier. Microscopic coupled channel equations with neutron rearrangement coupling were proposed and solved. They used distance dependent Q-values near the barrier. The satisfactory agreement between experimental data and calculation results is obtained for fusion cross sections in two reactions 18 O+ 58 Ni, 16 O+ 60 Ni in the vicinity of the Coulomb barrier.

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“…Calculations performed within the microscopic timedependent Schrödinger equations [18] have clearly demonstrated that at low collision energies of heavy ions nucleons do not "suddenly jump" from one nucleus to another. Instead of that, the wave functions of valence nucleons occupy the two-center molecular states spreading gradually over volumes of both nuclei (see Fig.…”

Section: The Modelmentioning

confidence: 99%

Production and study of new neutron rich heavy nuclei in multinucleon transfer reactions

Zagrebaev

Greiner

2013

EPJ Web of Conferences

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Abstract. Problems of production and study of new neutron-enriched heavy nuclei are discussed. Lowenergy multinucleon transfer reactions are shown to be quite appropriate for this purpose. Reactions with actinide beams and targets are of special interest for synthesis of new neutron-enriched transfermium nuclei and not-yet-known nuclei with closed neutron shell N = 126 having the largest impact on the astrophysical r-process. The estimated cross sections for the production of these nuclei look very promising for planning such experiments at currently available accelerators. These experiments, however, are rather expensive and difficult to perform because of low intensities of the massive projectile beams and problems of separating and detecting the heavy reaction products. Thus, realistic predictions of the corresponding cross sections for different projectile-target combinations are definitely required. Some uncertainty still remains in the values of several parameters used for describing the low-energy nuclear dynamics. This uncertainty does not allow one to perform very accurate predictions for the productions of new heavier-than-target (trans-target) nuclei in multinucleon transfer reactions. Nevertheless these predictions are rather promising (large cross sections) to start such experiments at available accelerators if the problem of separation of heavy transfer reaction products would be solved. MotivationThe upper part of the present-day nuclear map consists mainly of proton rich nuclei, while the unexplored area of heavy neutron enriched nuclides (also those located along the neutron closed shell N = 126 to the right-hand side of the stability line) is extremely important for nuclear astrophysics investigations and, in particular, for the understanding of the r process of astrophysical nucleogenesis. For elements with Z > 100 only neutron deficient isotopes (located to the left of the stability line) have been synthesized so far. Due to the bending of the stability line toward the neutron axis, in fusion reactions only proton-rich isotopes of heavy elements can be produced. That is the main reason for the impossibility of reaching the center of the island of stability (Z ∼ 110 ÷ 120 and N ∼ 184) in the superheavy (SH) mass region by fusion reactions with stable projectiles. Because of that we also have almost no information about neutron-rich isotopes of heavy elements located in the "northeast" part of the nuclear map: for example, there are 19 known neutron-rich isotopes of cesium (Z = 55) and only 4 of platinum (Z = 78) (see Fig. 1). Thus, the whole "northeast" area of the nuclear map is still terra incognita. Production and studying properties of nuclei located in this region will open a new field of research in nuclear physics. a e-mail: zagrebaev@jinr.ru b e-mail: greiner@fias.uni-frankfurt.de There are only three methods for the production of heavy elements, namely, fusion reactions, a sequence of neutron capture and β − decay processes and multi-nucleon transfer reactions. Fusion ReactionsFusion...

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Sub-barrier fusion of neutron-rich nuclei and its astrophysical consequences

Cited by 88 publications

References 46 publications

Time-dependent quantum models of the dynamics of neutron transfer reactions near the barrier

Time-dependent quantum models of the dynamics of neutron transfer reactions near the barrier

Coupling with two-center neutron states and two-surface collective excitations at fusion reactions in the vicinity of the Coulomb barrier

Production and study of new neutron rich heavy nuclei in multinucleon transfer reactions

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