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LI-KaVDU
lit
eng
li
53
N002
local/mk
Fizika
onn2015----nni-c-ay----
ks
Stepšys, Augustinas,
aut.
Vilniaus universitetas.
aut
211950810
li
High precision parallel implementation of four-particle harmonic oscillator transformation brackets for nuclear calculations.
p. 101-101.
The microscopic description of nuclear shell model is one of rapidly developing area of modern physics. While solving the Schrödinger's equation, the basis of harmonic oscillator functions has proven to be extremely useful and efficient in describing compact quantum systems, such as nucleons in atomic nuclei and quarks in hadrons. This kind of basis is simple to use, although it has one major disadvantage- it converges quite slow. For this reason the dimensions of matrices becomes very big as the values of quantum numbers, which are describing the elements of matrix. These values are required to find the coefficients for a few particle harmonic oscillator transformation brackets, which are constructed from Clebsh-Gordan, 6j and 9j coefficients. Although the analytical expressions of these coefficients are simple,but big problems arise while doing calculations on the computer. Currently widely used 64 bit (Double) precision is not sufficient for these type of calculations as doing intermediate evaluation of coefficients requires very large factorial values. Therefore calculated coefficients are represented not corectly. Another problem is quite slow calculation, which could be solved by paralleling the computer code and using large computer clusters. This component of multiparticle problem limits its evaluation, so the expansion of limits for algorithms for calculating of harmonic oscillator transformation brackets must be done. Using external parallelization library and mutable precision we created a pack of numerical codes based on the methods of compact expressions of the three and four- particle harmonics oscillator brackets. Program code is written in Fortran 90 programing language. For parallelization of used algorithm MPI parallel communication standard was used. [...].
Nuclear shell model.
Parallel techniques.
Transformation brackets.
Mickevičius, Saulius,
aut.
Vytauto Didžiojo universitetas.
C9E0443D4161A7F3A4B6D951531C9A51
aut
111950396-01-0104
li
Germanas, Darius,
aut.
Fizikos institutas.
8A33FCF9BDE6867B0D5625CD8A092293
aut
111954455
li
Kalinauskas, Ramutis Kazys,
aut.
Fizikos institutas.
9E78193E661A0A906A326EEE508A17AA
aut
111954455
li
The vital nature sign [elektroninis išteklius] : 9th international scientific conference : abstract book.
Kaunas : Vytautas Magnus university
2335-8653
2015, [no. 9]
2015/9/101
nnam
T1e
Tezės kituose recenzuojamuose leidiniuose
0
VDU
0090PUVIKA
99
20150909
VDU02
1437
Mickevičius
Saulius
Vytauto Didžiojo universitetas
LT
s.mickevicius@gmf.vdu.lt
070
111950396
C9E0443D4161A7F3A4B6D951531C9A51
0104
2178
VDU nėra
0090PUVIKA
99
20150909
VDU02
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20170727
VDU02
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BATCH-UPD
00
20190305
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BATCH-UPD
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20190318
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20190318
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20190320
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U7J661BIJR3JCBN83KXE38LAI4X15SXHIKR5C67Y4594YEC1L2