Four-nucleon scattering with a correlated Gaussian basis method

Abstract

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 a simple (0$s$) harmonic-oscillator shell model to a few-body model with a realistic interaction, in which the wave function 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${}^{\prime }$ potential as a realistic interaction and the Minnesota potential as an effective interaction. Especially for ${}^1{S}_0$, 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 ${}^4$He consistent with experiments. No such splitting is however reproduced with the effective interaction.

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Cited by in corpus (14)

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• Ab initio study of the photoabsorption of ${}^4$He
• Few-body approach to structure of $\bar{K}$-nuclear quasi-bound states
• Benchmark calculation of p-3H and n-3He scattering
• Towards a Unified Model of Neutrino-Nucleus Reactions for Neutrino Oscillation Experiments
• Spin-dipole strength functions of ${}^4$He with realistic nuclear forces
• Electric dipole response of ${}^6$He: Halo-neutron and core excitations
• Hyperspherical explicitly correlated Gaussian approach for few-body systems with finite angular momentum
• First observation of electron emission from the DD threshold resonance
• Theoretical study of the d(d,p)3H and d(d,n)3He processes at low energies
• Harmonic-oscillator excitations of precise few-body wave functions
• Calculable microscopic theory for ${}^{12}$C($\alpha ,\gamma$)${}^{16}$O cross section near Gamow window
• Constrained correlated-Gaussians for hyperspherical calculations
• Deformed Explicitly Correlated Gaussians