Coherent photoproduction of η-mesons off 3He - search for η-mesic nuclei

被引：62

作者：

Pheron, F. ^{[1
]}

Ahrens, J. ^{[2
]}

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

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

Bantawa, K. ^{[4
]}

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

Beck, R. ^{[5
]}

Bekrenev, V. ^{[6
]}

Berghaeuser, H. ^{[7
]}

Boillat, B. ^{[1
]}

Braghieri, A. ^{[8
]}

Branford, D. ^{[9
]}

Briscoe, W. J. ^{[10
]}

Brudvik, J. ^{[11
]}

Cherepnya, S. ^{[12
]}

Demissie, B. ^{[10
]}

Dieterle, M. ^{[1
]}

Downie, E. J. ^{[2
,3
,10
]}

Drexler, P. ^{[7
]}

Glazier, D. I. ^{[9
]}

Heid, E. ^{[2
]}

Fil'kov, L. V. ^{[12
]}

Hornidge, D. ^{[13
]}

Howdle, D. ^{[3
]}

Jahn, O. ^{[2
]}

Jaegle, I. ^{[1
]}

Jude, T. C. ^{[9
]}

Kashevarov, V. L. ^{[2
,12
]}

Keshelashvili, I. ^{[1
]}

Kondratiev, R. ^{[14
]}

Korolija, M. ^{[15
]}

Kotulla, M. ^{[1
,7
]}

Kulbardis, A. ^{[6
]}

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

Krusche, B. ^{[1
]}

Lisin, V. ^{[14
]}

Livingston, K. ^{[3
]}

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

Maghrbi, Y. ^{[1
]}

Mancell, J. ^{[3
]}

Manley, D. M. ^{[4
]}

Marinides, Z. ^{[10
]}

Martinez, M. ^{[2
]}

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

McNicoll, E. ^{[3
]}

Mekterovic, D. ^{[15
]}

Metag, V. ^{[7
]}

Micanovic, S. ^{[15
]}

Middleton, D. G. ^{[13
]}

Mushkarenkov, A. ^{[8
]}

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, SUPA, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

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

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

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

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

[8] INFN Sez Pavia, I-27100 Pavia, Italy

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

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

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

[12] PN Lebedev Phys Inst, RU-119991 Moscow, Russia

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

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

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

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

来源：

PHYSICS LETTERS B | 2012年 / 709卷 / 1-2期

基金：

加拿大自然科学与工程研究理事会; 英国科学技术设施理事会;

关键词：

NEAR-THRESHOLD PHOTOPRODUCTION; TAGGED PHOTON SPECTROMETER; BOUND-STATES; EXCLUSIVE MEASUREMENT; CROSS-SECTION; QUASI-FREE; MICROTRON; GAMMA;

D O I：

10.1016/j.physletb.2012.01.075

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Coherent photoproduction of eta-mesons off He-3, i.e. the reaction gamma He-3 -> eta He-3, has been investigated in the near-threshold region. The experiment was performed at the Glasgow tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball - TAPS detector. Angular distributions and the total cross section were measured using the eta -> gamma gamma and eta -> 3 pi(0) -> 6 gamma decay channels. The observed extremely sharp rise of the cross section at threshold and the behavior of the angular distributions are evidence for a strong eta He-3 final state interaction, pointing to the existence of a resonant state. The search for further evidence of this state in the excitation function of pi(0)-proton back-to-back emission in the gamma He-3 -> pi(0)pX reaction revealed a very complicated structure of the background and could not support previous conclusions. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：21 / 27

页数：7

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