Photoproduction of π0 Mesons off Neutrons in the Nucleon Resonance Region

被引：31

作者：

Dieterle, M. ^{[1
]}

Keshelashvili, I. ^{[1
]}

Ahrens, J. ^{[2
]}

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

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

Bantawa, K. ^{[4
]}

Bartolome, P. A. ^{[2
]}

Beck, R. ^{[2
,5
]}

Bekrenev, V. ^{[6
]}

Braghieri, A. ^{[7
]}

Branford, D. ^{[8
]}

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

Brudvik, J. ^{[10
]}

Cherepnya, S. ^{[11
]}

Demissie, B. ^{[9
]}

Downie, E. J. ^{[2
,3
,9
]}

Drexler, P. ^{[12
]}

Fil'kov, L. V. ^{[11
]}

Fix, A. ^{[13
]}

Glazier, D. I. ^{[8
]}

Hamilton, D. ^{[3
]}

Heid, E. ^{[2
]}

Hornidge, D. ^{[14
]}

Howdle, D. ^{[3
]}

Huber, G. M. ^{[15
]}

Jaegle, I. ^{[1
]}

Jahn, O. ^{[2
]}

Jude, T. C. ^{[8
]}

Kaeser, A.

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

Kondratiev, R. ^{[16
]}

Korolija, M. ^{[17
]}

Kruglov, S. P. ^{[6
]}

Krusche, B. ^{[1
]}

Kulbardis, A. ^{[6
]}

Lisin, V.

Livingston, K. ^{[3
]}

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

Maghrbi, Y. ^{[1
]}

Mancell, J. ^{[3
]}

Manley, D. M.

Marinides, Z.

Martinez, M. ^{[2
]}

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

McNicoll, E. ^{[3
]}

Mekterovic, D. ^{[17
]}

Metag, V.

Micanovic, S. ^{[2
]}

Middleton, G. ^{[14
]}

Mushkarenkov, A.

机构：

[1] Univ Basel, Dept Phys, CH-4003 Basel, Switzerland

[2] Johannes Gutenberg Univ Mainz, Inst Kernphys, Mainz, Germany

[3] Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland

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

[5] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, Bonn, Germany

[6] Petersburg Nucl Phys Inst, Gatchina, Russia

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

[8] Univ Edinburgh, Sch Phys, Edinburgh, Midlothian, Scotland

[9] George Washington Univ, Ctr Nucl Studies, Washington, DC USA

[10] Univ Calif Los Angeles, Los Angeles, CA USA

[11] PN Lebedev Phys Inst, Moscow, Russia

[12] Univ Giessen, Inst Phys 2, Giessen, Germany

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

[14] Mt Allison Univ, Sackville, NB E4L 1E6, Canada

[15] Univ Regina, Regina, SK S4S 0A2, Canada

[16] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[17] Rudjer Boskovic Inst, Zagreb, Croatia

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

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 14期

基金：

英国科学技术设施理事会; 瑞士国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

PION-PHOTOPRODUCTION; BARYON RESONANCES; PROTON; PHOTON; SINGLE; DELTA(1232); ASYMMETRY; MODEL;

D O I：

10.1103/PhysRevLett.112.142001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Precise angular distributions have been measured for the first time for the photoproduction of pi(0) mesons off neutrons bound in the deuteron. The effects from nuclear Fermi motion have been eliminated by a complete kinematic reconstruction of the final state. The influence of final-state-interaction effects has been estimated by a comparison of the reaction cross section for quasifree protons bound in the deuteron to the results for free protons and then applied as a correction to the quasifree neutron data. The experiment was performed at the tagged photon facility of the Mainz Microtron MAMI with the Crystal Ball and TAPS detector setup for incident photon energies between 0.45 and 1.4 GeV. The results are compared to the predictions from reaction models and partial-wave analyses based on data from other isospin channels. The model predictions show large discrepancies among each other and the present data will provide much tighter constraints. This is demonstrated by the results of a new analysis in the framework of the Bonn-Gatchina coupled-channel analysis which included the present data.

引用

页数：6

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