Coherent photoproduction of π0- and η-mesons off 7Li

被引：14

作者：

Maghrbi, Y. ^{[1
]}

Krusche, B. ^{[1
]}

Ahrens, J. ^{[2
]}

Annand, J. R. M. ^{[3
]}

Arends, H. J. ^{[2
]}

Beck, R. ^{[2
,4
]}

Bekrenev, V. ^{[5
]}

Boillat, B. ^{[1
]}

Braghieri, A. ^{[6
]}

Branford, D. ^{[7
]}

Briscoe, W. J. ^{[8
]}

Brudvik, J. ^{[9
]}

Cherepnya, S. ^{[10
]}

Codling, R. F. B. ^{[3
]}

Downie, E. J. ^{[2
,3
,8
]}

Drexler, P. ^{[11
]}

Fil'kov, L. V. ^{[10
]}

Fix, A. ^{[12
]}

Glazier, D. I. ^{[7
]}

Gregor, R. ^{[11
]}

Heid, E. ^{[2
]}

Hornidge, D. ^{[13
]}

Jaegle, I. ^{[1
]}

Jahn, O. ^{[2
]}

Kashevarov, V. L. ^{[2
,10
]}

Keshelashvili, I. ^{[1
]}

Knezevic, A. ^{[14
]}

Kondratiev, R. ^{[15
]}

Korolija, M. ^{[14
]}

Krambrich, D. ^{[2
]}

Lang, M. ^{[2
,4
]}

Lisin, V. ^{[15
]}

Livingston, K. ^{[3
]}

Lugert, S. ^{[11
]}

MacGregor, I. J. D. ^{[3
]}

Manley, D. M. ^{[16
]}

Martinez, M. ^{[2
]}

McGeorge, J. C. ^{[3
]}

Mekterovic, D. ^{[14
]}

Metag, V. ^{[11
]}

Nefkens, B. M. K. ^{[9
]}

Nikolaev, A. ^{[2
,4
]}

Novotny, R. ^{[11
]}

Ostrick, M. ^{[2
]}

Pedroni, P. ^{[6
]}

Pheron, F. ^{[1
]}

Polonski, A. ^{[15
]}

Prakhov, S. ^{[9
]}

Price, J. W. ^{[9
]}

Rosner, G. ^{[3
]}

机构：

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

[2] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[3] Univ Glasgow, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[4] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[5] Petersburg Nucl Phys Inst, RU-188300 Gatchina, Russia

[6] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy

[7] Univ Edinburgh, Sch Phys, Edinburgh EH9 3JZ, Midlothian, Scotland

[8] George Washington Univ, Ctr Nucl Studies, Washington, DC 20052 USA

[9] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[10] Lebedev Phys Inst, RU-119991 Moscow, Russia

[11] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany

[12] Tomsk Polytech Univ, Phys Math Lab, Tomsk, Russia

[13] Mt Allison Univ, Sackville, NB E4L 3B5, Canada

[14] Rudjer Boskovic Inst, HR-10000 Zagreb, Croatia

[15] Inst Nucl Res, RU-125047 Moscow, Russia

[16] Kent State Univ, Kent, OH 44242 USA

[17] Catholic Univ Amer, Washington, DC 20064 USA

来源：

EUROPEAN PHYSICAL JOURNAL A | 2013年 / 49卷 / 03期

基金：

英国科学技术设施理事会; 加拿大自然科学与工程研究理事会;

关键词：

NEAR-THRESHOLD PHOTOPRODUCTION; ELASTIC ELECTRON-SCATTERING; TAGGED PHOTON SPECTROMETER; EXCLUSIVE MEASUREMENT; PI(0)-PHOTOPRODUCTION; ELECTROPRODUCTION; PROTON; MODEL;

D O I：

10.1140/epja/i2013-13038-3

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：

Coherent photoproduction of pi(0)-mesons from threshold (E-th approximate to 136 MeV) throughout the Delta-resonance region and of eta-mesons close to the production threshold (E-th approximate to 570 MeV for eta) has been measured for Li-7 nuclei. The experiment was performed using the tagged-photon beam of the Mainz MAMI accelerator with the Crystal Ball and TAPS detectors combined to give an almost 4 pi solid-angle electromagnetic calorimeter. The reactions were identified by a combined invariant-mass and missing-energy analysis. A comparison of the pion data to plane-wave impulse modelling tests the nuclear mass form factor. So far coherent eta production had been only identified for the lightest nuclear systems (H-2 and He-3). For He-3 a large enhancement of the cross section above plane-wave approximations had been reported, indicating the formation of a quasi-bound state. The present Li data for eta production agree with a plane-wave approximation. Contrary to He-3, neither a threshold enhancement of the total cross section nor a deviation of the angular distributions from the expected form factor dependence were observed.

引用

页数：14

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