Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Schwamb, Michael"'
Publikováno v:
Eur.Phys.J.A33:29-38,2007
Results for the cross sections of the exclusive 16O(e,e'pn)14N and 16O(gamma,pn)14N knockout reactions are presented and discussed in different kinematics. In comparison with earlier work, a complete treatment of the center-of-mass (CM) effects in th
Externí odkaz:
http://arxiv.org/abs/0706.0636
Publikováno v:
Eur.Phys.J.A31:155-162,2007
The role of center-of mass (CM) effects in the one-body nuclear current in the description of electromagnetically induced two-nucleon knockout reactions is discussed in connection with the problem of the lack of orthogonality between initial bound st
Externí odkaz:
http://arxiv.org/abs/nucl-th/0701054
$\pi^0$-Photoproduction on the deuteron via $\Delta$-excitation using the Lorentz Integral Transform
Publikováno v:
Eur.Phys.J. A25 (2005) 171-176
The Lorentz Integral Transform method (LIT) is extended to pion photoproduction in the $\Delta$-resonance region. The main focus lies on the solution of the conceptual difficulties which arise if energy dependent operators for nucleon resonance excit
Externí odkaz:
http://arxiv.org/abs/nucl-th/0505030
Publikováno v:
Eur.Phys.J. A24 (2005) 361-372
The Lorentz Integral Transform approach allows microscopic calculations of electromagnetic reaction cross sections without explicit knowledge of final state wave functions. The necessary inversion of the transform has to be treated with great care, s
Externí odkaz:
http://arxiv.org/abs/nucl-th/0503033
Publikováno v:
Phys.Rev.Lett. 93 (2004) 202301
An explicit evaluation of the spin asymmetry of the deuteron and the associated GDH sum rule is presented which includes photodisintegration, single and double pion and eta production as well. Photodisintegration is treated with a realistic retarded
Externí odkaz:
http://arxiv.org/abs/nucl-th/0407058
Autor:
Schwamb, Michael, Arenhoevel, Hartmuth
Publikováno v:
AIP Conf.Proc. 603 (2001) 299-302
A model is developed for the hadronic and electromagnetic interaction in the two-nucleon system above pion threshold in the framework of meson, nucleon and $\Delta$ degrees of freedom. It is based on time-ordered perturbation theory and includes full
Externí odkaz:
http://arxiv.org/abs/nucl-th/0109003
Autor:
Arenhoevel, Hartmuth, Schwamb, Michael
Publikováno v:
Eur.Phys.J. A12 (2001) 207-215
We propose a new method for the construction of a consistent meson exchange current in $r$-space for the spin-isospin dependent central and tensor part of phenomenological nucleon-nucleon potentials by using a Laplace transformation, which allows the
Externí odkaz:
http://arxiv.org/abs/nucl-th/0108053
Autor:
Schwamb, Michael, Arenhoevel, Hartmuth
Publikováno v:
Nucl.Phys. A696 (2001) 556-580
Offshell contributions to the electromagnetic nuclear current are evaluated within a nonrelativistic approach by incorporation one-pion loop contributions in time-ordered perturbation theory. By construction, the correct experimental onshell properti
Externí odkaz:
http://arxiv.org/abs/nucl-th/0105033
Autor:
Schwamb, Michael, Arenhoevel, Hartmuth
Publikováno v:
Nucl.Phys. A690 (2001) 682-710
Photodisintegration of the deuteron above $\pi$ threshold is studied in a coupled channel approach including $N \Delta$ and $\pi d$ channels with consideration of pion retardation in potentials and exchange currents. A much improved description of to
Externí odkaz:
http://arxiv.org/abs/nucl-th/0008034
Autor:
Schwamb, Michael, Arenhoevel, Hartmuth
Publikováno v:
Nucl.Phys. A690 (2001) 647-681
A model is developed for the hadronic interaction in the two-nucleon system above pion threshold which is based on meson, nucleon and $\Delta$ degrees of freedom and which includes full meson retardation in the exchange operators. For technical reaso
Externí odkaz:
http://arxiv.org/abs/nucl-th/9912017