FIZIKA B 8 (1999) 1, 135-146

ELECTROMAGNETIC FEW-BODY RESPONSE FUNCTIONS WITH THE LORENTZ INTEGRAL TRANSFORM

WINFRIED LEIDEMANN^a, VICTOR D. EFROS^b, GIUSEPPINA ORLANDINI^a AND EDWARD L. TOMUSIAK^c

^aDipartimento di Fisica, Universita di Trento, I-38050 Povo, Italy and Istituto Nazionale di Fisica Nucleare, Gruppo collegato di Trento
^bRussian Research Centre "Kurchatov Institute", Kurchatov Square 1, 123182 Moscow, Russia
^cDepartment of Physics and Engineering Physics and Saskatchewan Accelerator Laboratory, University of Saskatchewan, Saskatoon, Canada S7N 0W0

Received 15 January 1999; Accepted 12 July 1999

The Lorentz integral transform method is described briefly. The resulting differential equations are solved via an expansion in hypersherical harmonics and a new approach is introduced for incorporating correlations in the basis functions. New results for the total photoabsorption cross section of ³H and ³He are presented. It is shown that the peak of the cross section is strongly affected by the three-nucleon force. In addition, we review the results for the ⁴He electromagnetic response functions obtained with the Lorentz integral transform method.

PACS numbers: 21.45.+v, 25.20.-x
UDC 539.128, 539.171

Keywords: Lorentz integral transform, differential equations, expansion in hypersherical harmonics, correlation basis functions, total photoabsorption cross section, ³H and ³He, three-nucleon force, ⁴He electromagnetic response functions

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