Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Four-nucleon scattering with a correlated Gaussian basis method   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 $^1S_0$, 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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The categories of this paper are: chem-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: econ
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th