Chinese Physics C > 2016, Vol. 40 > Issue(5): 054101 DOI: 10.1088/1674-1137/40/5/054101

Role of projectile breakup effects and intrinsic degrees of freedom on fusion dynamics

Manjeet Singh Gautam^,

1.
Department of Physics, Indus Degree College, Kinana, Jind-126102(Hargana), India

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Abstract：
This article analyzed the fusion dynamics of loosely bound and stable projectiles with Zr-target isotopes within the context of the coupled channel approach and the energy-dependent Woods-Saxon potential model(EDWSP model). In the case of the ²⁸Si+ ⁹⁰Zr reaction, the coupling to the inelastic surface excitations results in an adequate description of the observed fusion dynamics while in case of the ²⁸Si+ ⁹⁴Zr reaction, the coupling to collective surface vibrational states as well as the neutron(multi-neutron) transfer channel is necessary in the coupled channel calculations to reproduce the below-barrier fusion data. However, the EDWSP model calculation provides an accurate explanation of the fusion data of ²⁸Si+ ^{90, 94}Zr reactions in the domain of the Coulomb barrier. In the fusion of the ⁶Li+ ⁹⁰Zr reaction, the inclusion of the nuclear structure degrees of freedom recovers the observed sub-barrier fusion enhancement but results in suppression of the above barrier fusion data by 34% with respect to the coupled channel calculations. Using EDWSP model calculations, this suppression factor is reduced by 14% and consequently, the above-barrier fusion data of ⁶Li+ ⁹⁰Zr reaction is hindered by 20% with reference to the EDWSP model calculations. Such fusion hindrance at above-barrier energies can be correlated with the breakup of the projectile( ⁶Li) before reaching the fusion barrier, as a consequence of low binding energy.
- heavy-ion sub-barrier fusion reactions,
- coupled channel equations,
- weakly bound nuclei

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Manjeet Singh Gautam. Role of projectile breakup effects and intrinsic degrees of freedom on fusion dynamics[J]. Chinese Physics C, 2016, 40(5): 054101. doi: 10.1088/1674-1137/40/5/054101

Manjeet Singh Gautam. Role of projectile breakup effects and intrinsic degrees of freedom on fusion dynamics[J]. Chinese Physics C, 2016, 40(5): 054101. doi:10.1088/1674-1137/40/5/054101 shu

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Received: 2015-07-09

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Supported by Dr. D. S. Kothari Post-Doctoral Fellowship Scheme sponsored by University Grants Commission(UGC), New Delhi, India

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Role of projectile breakup effects and intrinsic degrees of freedom on fusion dynamics

Manjeet Singh Gautam^,

Corresponding author:Manjeet Singh Gautam,

1. Department of Physics, Indus Degree College, Kinana, Jind-126102(Hargana), India

Received Date:2015-07-09
Available Online:2016-05-05

Fund Project:Supported by Dr. D. S. Kothari Post-Doctoral Fellowship Scheme sponsored by University Grants Commission(UGC), New Delhi, India

Abstract:This article analyzed the fusion dynamics of loosely bound and stable projectiles with Zr-target isotopes within the context of the coupled channel approach and the energy-dependent Woods-Saxon potential model(EDWSP model). In the case of the²⁸Si+⁹⁰Zr reaction, the coupling to the inelastic surface excitations results in an adequate description of the observed fusion dynamics while in case of the²⁸Si+⁹⁴Zr reaction, the coupling to collective surface vibrational states as well as the neutron(multi-neutron) transfer channel is necessary in the coupled channel calculations to reproduce the below-barrier fusion data. However, the EDWSP model calculation provides an accurate explanation of the fusion data of²⁸Si+^{90, 94}Zr reactions in the domain of the Coulomb barrier. In the fusion of the⁶Li+⁹⁰Zr reaction, the inclusion of the nuclear structure degrees of freedom recovers the observed sub-barrier fusion enhancement but results in suppression of the above barrier fusion data by 34% with respect to the coupled channel calculations. Using EDWSP model calculations, this suppression factor is reduced by 14% and consequently, the above-barrier fusion data of⁶Li+⁹⁰Zr reaction is hindered by 20% with reference to the EDWSP model calculations. Such fusion hindrance at above-barrier energies can be correlated with the breakup of the projectile(⁶Li) before reaching the fusion barrier, as a consequence of low binding energy.