Zobrazeno 1 - 10
of 213
pro vyhledávání: '"Csoto, A."'
Publikováno v:
Astrophys.Space Sci.291:27-56,2004
We investigate the dependence of the carbon and oxygen production in stars on the 3-alpha rate by varying the energy of the 02+-state of 12C and determine the resulting yields for a selection of low-mass, intermediate-mass, and massive stars. The yie
Externí odkaz:
http://arxiv.org/abs/astro-ph/0307528
Publikováno v:
Nucl.Phys. A719 (2003) 283-286
We investigate the triple-alpha process and the Oklo phenomenon to obtain constraints on possible cosmological time variations of fundamental constants. Specifically we study cosmological temporal constraints for the fine structure constant and nucle
Externí odkaz:
http://arxiv.org/abs/astro-ph/0210459
Autor:
Csoto, Attila
Publikováno v:
Few Body Syst.Suppl. 13 (2000) 111-121
We have localized several few-body resonances in light nuclei, using methods which can properly handle two- or three-body resonant states. Among other results, we predict the existence of a three-neutron resonance, small spin-orbit splittings between
Externí odkaz:
http://arxiv.org/abs/nucl-th/0010105
Autor:
Csoto, Attila
We show that nuclear states lying at the edge of stability may show enormously enhanced response to small perturbations. For example, a 0.1% change in the strength of the strong nucleon-nucleon interaction can cause almost a hundred times bigger chan
Externí odkaz:
http://arxiv.org/abs/nucl-th/0010050
Autor:
Csoto, Attila, Langanke, Karlheinz
Publikováno v:
Nucl.Phys. A688 (2001) 511-513
We have studied the 4He(3He,gamma)7Be, 3He(3He,2p)4He, and 7Be(p,gamma)8B reactions of the solar p-p chain, using microscopic cluster models. Among other results, we showed that the 6Li+p channel has a nontrivial effect on the 7Be-producing reaction,
Externí odkaz:
http://arxiv.org/abs/nucl-th/0010053
Publikováno v:
Nucl.Phys. A688 (2001) 560-562
We show that the synthesis of carbon and oxygen through the triple-alpha process in red giant stars is extremely sensitive to the fine details of the nucleon-nucleon (N-N) interaction. A +/-0.5% change in the strength of the N-N force would reduce ei
Externí odkaz:
http://arxiv.org/abs/nucl-th/0010052
Publikováno v:
Nucl.Phys. A689 (2001) 269-279
In nucleosynthesis three possible paths are known to bridge the mass gaps at A=5 and A=8. The primary path producing the bulk of the carbon in our Universe proceeds via the triple-alpha process He4(2alpha,gamma)C12. This process takes place in helium
Externí odkaz:
http://arxiv.org/abs/nucl-th/0009046
Publikováno v:
Science 289 (2000) 88
The bulk of the carbon in our universe is produced in the triple-alpha process in helium-burning red giant stars. We calculated the change of the triple-alpha reaction rate in a microscopic 12-nucleon model of the C-12 nucleus and looked for the effe
Externí odkaz:
http://arxiv.org/abs/astro-ph/0007178
Autor:
Csoto, Attila
Publikováno v:
Phys.Rev. C61 (2000) 037601
In standard potential-model descriptions of the Be7(p,gamma)B8 reaction the Be7+p spectroscopic factors S appear in the cross section. We argue that the microscopic substructure effects which are represented by S are short-ranged and cannot affect th
Externí odkaz:
http://arxiv.org/abs/nucl-th/9908082
Autor:
Csoto, Attila
Publikováno v:
Phys.Rev. C61 (2000) 024311
We search for low-lying resonances in the B8 and Li8 nuclei using a microscopic cluster model and a variational scattering method, which is analytically continued to complex energies. After fine-tuning the nucleon-nucleon interaction to get the known
Externí odkaz:
http://arxiv.org/abs/nucl-th/9908081