Double-Pionic Fusion of Nuclear Systems and the "ABC" Effect: Approaching a Puzzle by Exclusive and Kinematically Complete Measurements

被引：194

作者：

Bashkanov, M. ^{[1
]}

Bargholtz, C. ^{[12
]}

Berlowski, M. ^{[6
,7
]}

Bogoslawsky, D. ^{[2
]}

Calen, H. ^{[3
]}

Clement, H. ^{[1
]}

Demiroers, L. ^{[5
]}

Doroshkevich, E. ^{[1
]}

Duniec, D. ^{[4
]}

Ekstrom, C. ^{[3
]}

Fransson, K. ^{[3
]}

Geren, L. ^{[12
]}

Gustafsson, L. ^{[4
]}

Hoistad, B. ^{[4
]}

Ivanov, G. ^{[2
]}

Jacewicz, M. ^{[4
]}

Jiganov, E. ^{[2
]}

Johansson, T. ^{[4
]}

Khakimova, O. ^{[1
]}

Keleta, S. ^{[4
]}

Koch, I. ^{[4
]}

Kren, F. ^{[1
]}

Kullander, S. ^{[4
]}

Kupsc, A. ^{[3
]}

Lindberg, K. ^{[12
]}

Marciniewski, P. ^{[3
]}

Meier, R. ^{[1
]}

Morosov, B. ^{[2
]}

Pauly, C. ^{[8
]}

Pettersson, H. ^{[4
]}

Petukhov, Y. ^{[2
]}

Povtorejko, A. ^{[2
]}

Pricking, A. ^{[1
]}

Ruber, R. J. M. Y. ^{[3
]}

Schonning, K. ^{[4
]}

Scobel, W. ^{[5
]}

Shwartz, B. ^{[9
]}

Skorodko, T. ^{[1
]}

Sopov, V. ^{[11
]}

Stepaniak, J. ^{[6
,7
]}

Tegner, P. -E. ^{[12
]}

Thorngren-Engblom, P. ^{[4
]}

Tikhomirov, V. ^{[2
]}

Turowiecki, A. ^{[10
]}

Wagner, G. J. ^{[1
]}

Wolke, M. ^{[8
]}

Zabierowski, J. ^{[8
]}

Zartova, I. ^{[12
]}

Zlomanczuk, J. ^{[4
]}

机构：

[1] Univ Tubingen, Inst Phys, D-72076 Tubingen, Germany

[2] Joint Inst Nucl Res, Dubna, Russia

[3] Svedberg Lab, S-75121 Uppsala, Sweden

[4] Uppsala Univ, Uppsala, Sweden

[5] Univ Hamburg, Hamburg, Germany

[6] Soltan Inst Nucl Studies, Lodz, Poland

[7] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland

[8] Forschungszentrum Julich, Julich, Germany

[9] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[10] Univ Warsaw, Inst Expt Phys, Warsaw, Poland

[11] Inst Theoret & Expt Phys, Moscow 117259, Russia

[12] Stockholm Univ, Dept Phys, S-10691 Stockholm, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 05期

基金：

瑞典研究理事会;

关键词：

EFFECTIVE-MASS-SPECTRUM; PI-PI; ENHANCEMENTS; MOMENTUM; MODEL;

D O I：

10.1103/PhysRevLett.102.052301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ABC effect-a puzzling low-mass enhancement in the pi pi invariant mass spectrum, first observed by Abashian, Booth, and Crowe-is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn -> d pi(0)pi(0) at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (pi pi)(I=L=0) channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a Delta Delta system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.

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