Relativistic effects in electromagnetic meson-exchange currents for one-particle emission reactions

被引:36
作者
Amaro, JE [1 ]
Barbaro, MB
Caballero, JA
Donnelly, TW
Molinari, A
机构
[1] Univ Granada, Dept Fis Moderna, E-18071 Granada, Spain
[2] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy
[3] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy
[4] Univ Sevilla, Dept Fis Atom Mol & Nucl, E-41080 Seville, Spain
[5] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain
[6] MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA
[7] MIT, Dept Phys, Cambridge, MA 02139 USA
关键词
D O I
10.1016/S0375-9474(98)00569-7
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Following recent studies of non-relativistic reductions of the single-nucleon electromagnetic current operator, here we extend the treatment to include meson-exchange current operators. We focus on one-particle emission electronuclear reactions. In contrast to the traditional scheme where approximations are made for the transferred momentum, transferred energy and momenta of the initial-state struck nucleons, we treat the problem exactly for the transferred energy and momentum, thus obtaining new current operators which retain important aspects of relativity not taken into account in the traditional non-relativistic reductions. We calculate the matrix elements of our current operators between the Fermi sphere and a particle-hole state for several choices of kinematics. We present a comparison between our results using approximate current operators and those obtained using the fully relativistic operators, as well as with results obtained using the traditional non-relativistic current operators. (C) 1998 Elsevier Science B.V.
引用
收藏
页码:349 / 382
页数:34
相关论文
共 30 条
[1]   Intrinsic operators for the electromagnetic nuclear current [J].
Adam, J ;
Arenhovel, H .
NUCLEAR PHYSICS A, 1997, 614 (03) :289-336
[2]   THE PION IN ELECTROMAGNETIC AND WEAK NEUTRAL-CURRENT NUCLEAR RESPONSE FUNCTIONS [J].
ALBERICO, WM ;
BARBARO, MB ;
DEPACE, A ;
DONNELLY, TW ;
MOLINARI, A .
NUCLEAR PHYSICS A, 1993, 563 (04) :605-648
[3]  
ALBERICO WM, 1990, NUCL PHYS A, V512, P541, DOI 10.1016/0375-9474(90)93832-Q
[4]   ELECTROMAGNETIC QUASI-ELASTIC RESPONSES IN C-12 [J].
AMARO, JE ;
CO, G ;
LALLENA, AM .
ANNALS OF PHYSICS, 1993, 221 (02) :306-340
[5]   Inclusive quasielastic scattering of polarized electrons from polarized nuclei [J].
Amaro, JE ;
Caballero, JA ;
Donnelly, TW ;
deGuerra, EM .
NUCLEAR PHYSICS A, 1996, 611 (2-3) :163-210
[6]   Spin observables in coincidence electron scattering from nuclei I. Reduced response functions [J].
Amaro, JE ;
Donnelly, TW .
ANNALS OF PHYSICS, 1998, 263 (01) :56-118
[7]   Parity violation in quasielastic electron scattering from closed-shell nuclei [J].
Amaro, JE ;
Caballero, JA ;
Donnelly, TW ;
Lallena, AM ;
deGuerra, EM ;
Udias, JM .
NUCLEAR PHYSICS A, 1996, 602 (3-4) :263-307
[8]   MESON-EXCHANGE CURRENT EFFECTS IN ELASTIC ELECTRON-SCATTERING FROM POLARIZED NUCLEI [J].
AMARO, JE ;
GARCIARECIO, C ;
LALLENA, AM .
NUCLEAR PHYSICS A, 1994, 567 (04) :701-733
[9]  
AMARO JE, 1992, PHYS LETT B, V277, P365
[10]  
Bjorken JD, 1964, RELATIVISTIC QUANTUM