Photoproduction of η-mesons off nuclei for Eγ ≤ 2.2 GeV

被引：38

作者：

Mertens, T. ^{[1
]}

Jaegle, I. ^{[1
]}

Muehlich, P. ^{[2
]}

Bacelar, J. C. S. ^{[3
]}

Bantes, B. ^{[4
]}

Bartholomy, O. ^{[5
]}

Bayadilov, D. E. ^{[5
,6
]}

Beck, R. ^{[5
]}

Beloglazov, Y. A. ^{[6
]}

Castelijns, R. ^{[3
]}

Crede, V. ^{[5
,7
]}

Dutz, H. ^{[4
]}

Ehmanns, A. ^{[5
]}

Elsner, D.

Essig, K. ^{[5
]}

Ewald, R.

Fabry, I. ^{[5
]}

Fornet-Ponse, K.

Fuchs, M. ^{[5
]}

Funke, C. ^{[5
]}

Gothe, R. ^{[4
]}

Gregor, R. ^{[8
]}

Gridnev, A. B. ^{[6
]}

Gutz, E. ^{[5
]}

Hoeffgen, S. ^{[4
]}

Hoffmeister, P. ^{[5
]}

Horn, I. ^{[5
]}

Junkersfeld, J. ^{[5
]}

Kalinowsky, H. ^{[5
]}

Kammer, S. ^{[4
]}

Kleber, V. ^{[4
]}

Klein, Frank ^{[4
]}

Klein, Friedrich ^{[4
]}

Klempt, E. ^{[5
]}

Konrad, M. ^{[4
]}

Kotulla, M. ^{[1
]}

Krusche, B. ^{[1
]}

Lang, M. ^{[5
]}

Langheinrich, J. ^{[4
]}

Loehner, H.

Lopatin, I. V. ^{[6
]}

Lotz, J. ^{[5
]}

Lugert, S. ^{[8
]}

Menze, D. ^{[4
]}

Messchendorp, J. G. ^{[3
]}

Metag, V. ^{[8
]}

Morales, C. ^{[4
]}

Mosel, U.

Nanova, M. ^{[8
]}

Novinski, D. V. ^{[5
,6
]}

机构：

[1] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[2] Univ Giessen, Inst Theoret Phys 1, D-35390 Giessen, Germany

[3] Univ Groningen, KVI, NL-9700 AB Groningen, Netherlands

[4] Univ Bonn, Inst Phys, D-5300 Bonn, Germany

[5] Univ Bonn, Helmholtz Inst Strahlen Kernphys, D-5300 Bonn, Germany

[6] Petersburg Nucl Phys Inst, Gatchina, Russia

[7] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[8] Univ Giessen, Inst Phys 2, D-35390 Giessen, Germany

来源：

EUROPEAN PHYSICAL JOURNAL A | 2008年 / 38卷 / 02期

关键词：

D O I：

10.1140/epja/i2007-10667-y

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 photoproduction of eta-mesons off C-12, Ca-40, Nb-93, and Pb-nat nuclei has been measured with a tagged photon beam with energies between 0.6 and 2.2 GeV. The experiment was performed at the Bonn ELSA accelerator with the combined setup of the Crystal Barrel and TAPS calorimeters. It aimed at the in-medium properties of the S-11(1535) nucleon resonance and the study of the absorption properties of nuclear matter for eta-mesons. Careful consideration was given to contributions from eta pi final states and secondary production mechanisms of eta-mesons, e.g. from inelastic pi N reactions of intermediate pions. The analysis of the mass number scaling shows that the nuclear absorption cross-section sigma(N eta) for eta-mesons is constant over a wide range of the eta momentum. The comparison of the excitation functions to data off the deuteron and to calculations in the framework of a BUU model show no unexplained in-medium modi. cations of the S-11(1535).

引用

页码：195 / 207

页数：13

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