Four-Nucleon Scattering with a Correlated Gaussian Basis Method

被引：0
作者：
S. Aoyama
K. Arai
Y. Suzuki
P. Descouvemont
D. Baye
机构：
[1] Niigata University,Center for Academic Information Service
[2] Nagaoka National College of Technology,Division of General Education
[3] Niigata University,Department of Physics
[4] RIKEN Nishina Center,Physique Nucléaire Théorique et Physique Mathématique
[5] Université Libre de Bruxelles (ULB),Physique Quantique
[6] Université Libre de Bruxelles (ULB),undefined
来源：
Few-Body Systems | 2012年 / 52卷
关键词：
Phase Shift; Tensor Force; Realistic Interaction; Global Vector; Negative Parity State;
D O I：
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中图分类号：
学科分类号：
摘要：
Elastic-scattering phase shifts for four-nucleon systems are studied in an ab-initio type cluster model in order to clarify the role of the tensor force and to investigate cluster distortions in low energy d+d and t+p scattering. In the present method, the description of the cluster wave function is extended from (0s) harmonic-oscillator shell model to a few-body model with a realistic interaction, in which the wave functions of the subsystems are determined with the Stochastic Variational Method. In order to calculate the matrix elements of the four-body system, we have developed a Triple Global Vector Representation method for the correlated Gaussian basis functions. To compare effects of the cluster distortion with realistic and effective interactions, we employ the AV8′ potential + a three nucleon force as a realistic interaction and the Minnesota potential as an effective interaction. Especially for 1S0, the calculated phase shifts show that the t+p and h+n channels are strongly coupled to the d+d channel for the case of the realistic interaction. On the contrary, the coupling of these channels plays a relatively minor role for the case of the effective interaction. This difference between both potentials originates from the tensor term in the realistic interaction. Furthermore, the tensor interaction makes the energy splitting of the negative parity states of 4He consistent with experiments. No such splitting is however reproduced with the effective interaction.
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页码：97 / 123
页数：26
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