ELFT HÍRADÓ

[Zoltan Mate <mate AT namafia.atomki.hu>]

Az MTA Atommagkutató Intézetének előadótermében
(Debrecen, Bem tér 18/c. 12. ép. III. em.)
2011. december 1-én, csütörtökön 11:00-kor


              S. Aoyama
   (Niigata University, Niigata, Japan)

An ab-initio reaction calculation for four-nucleon scattering


címmel előadást tart

Az előadás előtt 10:30-tól tea, vendégeket szívesen látunk.


                                           Máté Zoltán


Kivonat
Elastic-scattering phase shifts for four-nucleon systems
are studied in an ab-initio reaction calculation.
The role of the tensor force and to investigate cluster distortions
in low energy d+d and t+p scattering is clarified.
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 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' 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.
In the present talk, I am going to discuss the role of the tensor
force in the excited states of 4He.