Zobrazeno 1 - 10
of 208
pro vyhledávání: '"J.L. Gammel"'
Publikováno v:
Nuclear Physics A. 348:474-478
A generalization of the variational matrix Pade approximant is described. A criterion for the selection of the best stationary point is suggested and tested numerically.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d50020ec66f5b327632de2394aa44aa2
https://doi.org/10.1016/0375-9474(80)90266-3
https://doi.org/10.1016/0375-9474(80)90266-3
Autor:
J.L. Gammel, M.T. Menzel
Publikováno v:
Physical Review D. 11:963-966
The matrix Pad\'e approximants introduced in a previous paper are extended to include "off-shell" effects. The [1/1] Pad\'e approximant becomes very accurate with the addition of only a few "off-shell" states.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3e6588bac9c580bf624c409d56d12e86
https://doi.org/10.1103/physrevd.11.963
https://doi.org/10.1103/physrevd.11.963
Publikováno v:
Physical Review D. 13:3111-3114
In calculations using matrix Pade approximants, an off-shell momentum (or several off-shell momenta) is introduced. In previous work, this momentum was chosen arbitrarily and not varied. However, it is a variational parameter and may be varied to fin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::78f7e0548ba240ead04707936a324839
https://doi.org/10.1103/physrevd.13.3111
https://doi.org/10.1103/physrevd.13.3111
Publikováno v:
Journal of Computational and Applied Mathematics. 7(2):135-140
We propose a method for continuing an analytic function from its power series expansion that enables us to choose the location of cuts joining the branch points. The method is superior to the Pade approximant method in this respect and also because p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::662503d6ef63fffe70f6129d29dc788d
Autor:
R.M. Delaney, J.L. Gammel
Publikováno v:
Physical Review D. 12:1978-1983
The 25 observables which describe p--p scattering are related by 16 independent quadratic relations. A method is developed for determining these quadratic relations. Provided a certain condition is satisfied, the particular set so determined and the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef7ed8cea9b94b3103004059394499ef
https://doi.org/10.1103/physrevd.12.1978
https://doi.org/10.1103/physrevd.12.1978
Publikováno v:
Physical Review D. 8:1545-1552
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::96603bab7f719d8fd2c29196237f9360
https://doi.org/10.1103/physrevd.8.1545
https://doi.org/10.1103/physrevd.8.1545
Autor:
J.L. Gammel, A.D. MacKellar
Publikováno v:
Physical Review. 133:B1476-B1482
Assuming that the range of nuclear forces is small compared to the size of the triton and the wavelength of the incoming neutron ( zero-range'' approximation), a connection is derived between the cross sections for elastic and inelastic n-t scatterin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d61c013ba7e767ea7dbd0fce548584ea
https://doi.org/10.1103/physrev.133.b1476
https://doi.org/10.1103/physrev.133.b1476
Publikováno v:
Physical Review D. 3:2175-2184
The Bethe-Salpeter equation is solved for nucleon-nucleon scattering in the ladder approximation with pion exchange for the $^{1}S_{0}$ and $^{3}P_{0}$ states with no approximations beyond use of a finite mesh. It is found that solutions exist withou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb6ecbdf4d1b2fca7477f8a87e6fe166
https://doi.org/10.1103/physrevd.3.2175
https://doi.org/10.1103/physrevd.3.2175
Publikováno v:
Journal of Mathematical Analysis and Applications. 20(3):416-420
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::466dec229adc20b37db343d1621c5434
Autor:
J.L Gammel, W.R Wortman
Publikováno v:
Journal of Computational Physics. 10:568-606
Some of the series resulting from quantum field theory are known to be summable by Pade approximants. As a test of the feasibility of generating such series by numerically calculating the Feynman graphs in each order, we have calculated sixth order g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b66f9507241dc5dd815e9dfcb5ed5b59
https://doi.org/10.1016/0021-9991(72)90053-8
https://doi.org/10.1016/0021-9991(72)90053-8