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.
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页数:14
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