Angular momentum limit for fusion of halo and weakly bound systems

Aguilera, E. F.; Kolata, J. J.

doi:10.1103/physrevc.85.014603

Cited by 31 publications

(21 citation statements)

References 26 publications

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“…The small enhancement as compared to the reference (tightly bound) system 16 O+ 58 Ni is here related to the low binding energy of the 17 F valence proton. This moderate effect is mainly triggered from a transfer effect, as observed for the 2n-halo 6 He [18,19] and the 1n-halo 11 Be [42] in contrast to the 1p-halo 8 B+ 58 Ni reaction where strong enhancements are trigerred from a breakup process [45].…”

Section: Coupled-channel Calculations For Reactions Induced By Halo Nmentioning

confidence: 99%

“…For reactions induced by weakly bound nuclei [16,17,25,26,27,28,39,40,41] and exotic nuclei [18,19,20,21,22,38,42,43,44,45,46], the breakup channel is open and plays a key role in the fusion process near the Coulomb barrier similarly to the transfer-channel coupling described in the previous section. It is therefore appropriate to use the Continuum-Discretized Coupled-Channel (CDCC) approach [47,48,49,50] to describe the influence of the breakup channel in both the elastic scattering and the fusion process at sub-barrier energies.…”

Section: LI + 59 Co and 7 Li + 59 Co Reactionsmentioning

confidence: 99%

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Coupled-Channel Effects in Collisions Between Heavy Ions Near the Coulomb Barrier

Beck¹

2013

Exciting Interdisciplinary Physics

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With the recent availability of state-of-the-art heavy-ion stable and radioactive beams, there has been a renew interest in the investigation of nuclear reactions with heavy ions. I first present the role of inelastic and transfer channel couplings in fusion reactions induced by stable heavy ions. Analysis of experimental fusion cross sections by using standard coupled-channel calculations is discussed. The role of multi-neutron transfer is investigated in the fusion process below the Coulomb barrier by analyzing 32 S+ 90,96 Zr as benchmark reactions. The enhancement of fusion cross sections for 32 S+ 96 Zr is well reproduced at sub-barrier energies by NTFus code calculations including the coupling of the neutron-transfer channels following the Zagrebaev semi-classical model. Similar effects for 40 Ca+ 90 Zr and 40 Ca+ 96 Zr fusion excitation functions are found. The breakup coupling in both the elastic scattering and in the fusion process induced by weakly bound stable projectiles is also shown to be crucial. In this lecture, full coupled-channel calculations of the fusion excitation functions are performed by using the breakup coupling for the more neutron-rich reaction and for the more weakly bound projectiles. I clearly demonstrate that Continuum-Discretized Coupled-Channel calculations are capable to reproduce the fusion enhancement from the breakup coupling in 6 Li+ 59 Co.

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Section: Coupled-channel Calculations For Reactions Induced By Halo Nmentioning

confidence: 99%

Section: LI + 59 Co and 7 Li + 59 Co Reactionsmentioning

confidence: 99%

Coupled-Channel Effects in Collisions Between Heavy Ions Near the Coulomb Barrier

Beck¹

2013

Exciting Interdisciplinary Physics

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“…Assuming a sharp cut-off model for fusion, and using Hill and Wheeler's values of the transmission coefficients, we arrive at an expression for the fusion cross-section (σ fus ) [8],…”

Section: Formalismmentioning

confidence: 99%

“…The essential idea is to determine the breakup fraction of the projectile as a function of the impact parameter. Then, by incorporating a quantum mechanical technique to find out the cut-o ff a. e-mail: chinmoy.phookan@gmail.com b. e-mail: ku_kalita@yahoo.com impact parameter for fusion [8], we propose a simple formula for the fusion suppression factor.…”

Section: Introductionmentioning

confidence: 99%

A model for explaining fusion suppression using the classical trajectory method

Phookan¹,

Kalita²

2013

J. Phys. G: Nucl. Part. Phys.

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Abstract. We adopt a semi-classical approach for explanation of projectile breakup and above barrier fusion suppression for the reactions 6 Li+ 152 Sm and 6 Li+ 144 Sm. The cut-off impact parameter for fusion is determined by employing quantum mechanical ideas. Within this cut-off impact parameter for fusion, the fraction of projectiles undergoing breakup is determined using the method of classical trajectory in two-dimensions. For obtaining the initial conditions of the equations of motion, a simplified model of the 6 Li nucleus has been proposed. We introduce a simple formula for explanation of fusion suppression. We find excellent agreement between the experimental and calculated fusion cross section. A slight modification of the above formula for fusion suppression is also proposed for a three-dimensional model.

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“…In the present work we have studied the fusion of one proton halo nucleus 8 B with 58 Ni in near barrier energy region by quantum diffusion approach. Very recently Aguilera et al [12] have measured the fusion cross section of 8 B, ground state proton halo nucleus, on 58 Ni target at energies above and below the Coulomb barrier and analyzed the data using Wong formula with barrier height, radius and curvature as free parameters. Subsequently J. Rangel et al [13] analyzed these data through reliable calculation without any free parameters and found that experimental fusion cross section for 8 B + 58 Ni system could not be explained correctly.…”

Section: Introductionmentioning

confidence: 99%