ON MESON-EXCHANGE AND DELTA-ISOBAR CURRENTS IN THE 2-NUCLEON PHOTOABSORPTION MECHANISM

被引：23

作者：

VANDERHAEGHEN, M ^{[1
]}

MACHENIL, L ^{[1
]}

RYCKEBUSCH, J ^{[1
]}

WAROQUIER, M ^{[1
]}

机构：

[1] STATE UNIV GHENT,PHYS THEOR LAB,B-9000 GHENT,BELGIUM

来源：

NUCLEAR PHYSICS A | 1994年 / 580卷 / 04期

关键词：

D O I：

10.1016/0375-9474(94)90781-1

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：

The role of pi- and p-meson exchange currents and dynamic Delta-isobar currents with both pi- and p-exchange are studied in two-nucleon knockout reactions. The Gottfried approximation is tested for these different absorption mechanisms by making a comparison between a factorized (Gottfried) model and an unfactorized model. For the unfactorized model, analytical expressions are given for the different absorption mechanisms by using harmonic-oscillator wavefunctions. The formalism is applied to the O-16(gamma,pn) reaction in the photon-energy range E(gamma) = 60-300 MeV. Over the whole energy range, the p-meson degree of freedom is found not to be negligible. It is demonstrated that the unfactorized treatment leads to a sizeable reduction of the cross section and to a change of the shape of the angular cross section.

引用

页码：551 / 576

页数：26

共 30 条

[1] 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

[2] PHOTON-INDUCED EMISSION OF PIONS AND PROTONS FROM VARIOUS NUCLEI IN THE DELTA-RESONANCE REGION [J].

ARENDS, J ;

DETEMPLE, P ;

FLOSS, N ;

HUTHMACHER, S ;

KAUL, G ;

MECKING, B ;

NOLDEKE, G ;

STENZ, R .

NUCLEAR PHYSICS A, 1991, 526 (3-4) :479-494

[3] ELECTRON-SCATTERING STUDIES OF CORRELATIONS IN NUCLEI [J].

BENHAR, O ;

PANDHARIPANDE, VR ;

PIEPER, SC .

REVIEWS OF MODERN PHYSICS, 1993, 65 (03) :817-828

[4] 2-NUCLEON PHOTOEMISSION AND NUCLEAR CORRELATIONS [J].

BOATO, L ;

GIANNINI, MM .

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 1989, 15 (10) :1605-1620

[5] DISTORTION IN 2-NUCLEON PHOTOEMISSION [J].

BOFFI, S ;

GIANNINI, MM .

NUCLEAR PHYSICS A, 1991, 533 (03) :441-454

[6] DYNAMICS OF DIRECT PHOTOEMISSION OF PROTON-NEUTRON PAIRS [J].

BOFFI, S ;

GIUSTI, C ;

PACATI, FD ;

RADICI, M .

NUCLEAR PHYSICS A, 1993, 564 (04) :473-490

[7]

Brown G. E., 1975, Physics Reports. Physics Letters Section C, V22c, P279, DOI 10.1016/0370-1573(75)90026-5

[8] INVESTIGATION OF THE C-12 (GAMMA,PN) REACTION USING TAGGED PHOTONS [J].

DANCER, SN ;

MACGREGOR, IJD ;

ANNAND, JRM ;

ANTHONY, I ;

CRAWFORD, GI ;

HALL, SJ ;

KELLIE, JD ;

MCGEORGE, JC ;

OWENS, RO ;

WALLACE, PA ;

BRANFORD, D ;

SPRINGHAM, SV ;

SHOTTER, AC ;

SCHOCH, B ;

VOGT, JM ;

BECK, R ;

LIESENFELD, G .

PHYSICAL REVIEW LETTERS, 1988, 61 (10) :1170-1173

[9]

ERICSON T, 1988, PIONS NUCLEI

[10]

Fetter A, 2003, QUANTUM THEORY MANY

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