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

CELSIUS-WASA Collaboration; M. Bashkanov; C. Bargholtz; M. Berlowski; D. Bogoslawsky; H. Calen; H. Clement; L. Demiroers; E. Doroshkevich; D. Duniec; C. Ekstrom; K. Fransson; L. Geren; L. Gustafsson; B. Hoistad; G. Ivanov; M. Jacewicz; E. Jiganov; T. Johansson; O. Khakimova; S. Keleta; I. Koch; F. Kren; S. Kullander; A. Kupsc; K. Lindberg; P. Marciniewski; R. Meier; B. Morosov; C. Pauly; H. Pettersson; Y. Petukhov; A. Povtorejko; A. Pricking; R. J. M. Y. Ruber; K. Schonning; W. Scobel; B. Shwartz; T. Skorodko; V. Sopov; J. Stepaniak; P. -E. Tegner; P. Thorngren-Engblom; V. Tikhomirov; A. Turowiecki; G. J. Wagner; M. Wolke; J. Zabierowski; I. Zartova; J. Zlomanczuk

doi:10.1103/PhysRevLett.102.052301

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

CELSIUS-WASA Collaboration, M. Bashkanov^*, C. Bargholtz, M. Berlowski, D. Bogoslawsky, H. Calen, H. Clement, L. Demiroers, E. Doroshkevich, D. Duniec, C. Ekstrom, K. Fransson, L. Geren, L. Gustafsson, B. Hoistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, O. KhakimovaS. Keleta, I. Koch, F. Kren, S. Kullander, A. Kupsc, K. Lindberg, P. Marciniewski, R. Meier, B. Morosov, C. Pauly, H. Pettersson, Y. Petukhov, A. Povtorejko, A. Pricking, R. J. M. Y. Ruber, K. Schonning, W. Scobel, B. Shwartz, T. Skorodko, V. Sopov, J. Stepaniak, P. -E. Tegner, P. Thorngren-Engblom, V. Tikhomirov, A. Turowiecki, G. J. Wagner, M. Wolke, J. Zabierowski, I. Zartova, J. Zlomanczuk

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	052301
Number of pages	5
Journal	Physical Review Letters
Volume	102
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.102.052301
Publication status	Published - 6 Feb 2009

Keywords / Materials (for Non-textual outputs)

EFFECTIVE-MASS-SPECTRUM
GEV-C
MESON PRODUCTION
CROSS-SECTIONS
S-WAVE
PI-PI
ENHANCEMENT
COLLISIONS
MOMENTUM
MODEL

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10.1103/PhysRevLett.102.052301

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CELSIUS-WASA Collaboration, Bashkanov, M., Bargholtz, C., Berlowski, M., Bogoslawsky, D., Calen, H., Clement, H., Demiroers, L., Doroshkevich, E., Duniec, D., Ekstrom, C., Fransson, K., Geren, L., Gustafsson, L., Hoistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., ... Zlomanczuk, J. (2009). Double-Pionic Fusion of Nuclear Systems and the "ABC" Effect: Approaching a Puzzle by Exclusive and Kinematically Complete Measurements. Physical Review Letters, 102(5), Article 052301. https://doi.org/10.1103/PhysRevLett.102.052301

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

abstract = "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.",

keywords = "EFFECTIVE-MASS-SPECTRUM, GEV-C, MESON PRODUCTION, CROSS-SECTIONS, S-WAVE, PI-PI, ENHANCEMENT, COLLISIONS, MOMENTUM, MODEL",

author = "{CELSIUS-WASA Collaboration} and M. Bashkanov and C. Bargholtz and M. Berlowski and D. Bogoslawsky and H. Calen and H. Clement and L. Demiroers and E. Doroshkevich and D. Duniec and C. Ekstrom and K. Fransson and L. Geren and L. Gustafsson and B. Hoistad and G. Ivanov and M. Jacewicz and E. Jiganov and T. Johansson and O. Khakimova and S. Keleta and I. Koch and F. Kren and S. Kullander and A. Kupsc and K. Lindberg and P. Marciniewski and R. Meier and B. Morosov and C. Pauly and H. Pettersson and Y. Petukhov and A. Povtorejko and A. Pricking and Ruber, {R. J. M. Y.} and K. Schonning and W. Scobel and B. Shwartz and T. Skorodko and V. Sopov and J. Stepaniak and Tegner, {P. -E.} and P. Thorngren-Engblom and V. Tikhomirov and A. Turowiecki and Wagner, {G. J.} and M. Wolke and J. Zabierowski and I. Zartova and J. Zlomanczuk",

year = "2009",

month = feb,

day = "6",

doi = "10.1103/PhysRevLett.102.052301",

language = "English",

volume = "102",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

}

CELSIUS-WASA Collaboration, Bashkanov, M, Bargholtz, C, Berlowski, M, Bogoslawsky, D, Calen, H, Clement, H, Demiroers, L, Doroshkevich, E, Duniec, D, Ekstrom, C, Fransson, K, Geren, L, Gustafsson, L, Hoistad, B, Ivanov, G, Jacewicz, M, Jiganov, E, Johansson, T, Khakimova, O, Keleta, S, Koch, I, Kren, F, Kullander, S, Kupsc, A, Lindberg, K, Marciniewski, P, Meier, R, Morosov, B, Pauly, C, Pettersson, H, Petukhov, Y, Povtorejko, A, Pricking, A, Ruber, RJMY, Schonning, K, Scobel, W, Shwartz, B, Skorodko, T, Sopov, V, Stepaniak, J, Tegner, P-E, Thorngren-Engblom, P, Tikhomirov, V, Turowiecki, A, Wagner, GJ, Wolke, M, Zabierowski, J, Zartova, I & Zlomanczuk, J 2009, 'Double-Pionic Fusion of Nuclear Systems and the "ABC" Effect: Approaching a Puzzle by Exclusive and Kinematically Complete Measurements', Physical Review Letters, vol. 102, no. 5, 052301. https://doi.org/10.1103/PhysRevLett.102.052301

TY - JOUR

T1 - Double-Pionic Fusion of Nuclear Systems and the "ABC" Effect

T2 - Approaching a Puzzle by Exclusive and Kinematically Complete Measurements

AU - CELSIUS-WASA Collaboration

AU - Bashkanov, M.

AU - Bargholtz, C.

AU - Berlowski, M.

AU - Bogoslawsky, D.

AU - Calen, H.

AU - Clement, H.

AU - Demiroers, L.

AU - Doroshkevich, E.

AU - Duniec, D.

AU - Ekstrom, C.

AU - Fransson, K.

AU - Geren, L.

AU - Gustafsson, L.

AU - Hoistad, B.

AU - Ivanov, G.

AU - Jacewicz, M.

AU - Jiganov, E.

AU - Johansson, T.

AU - Khakimova, O.

AU - Keleta, S.

AU - Koch, I.

AU - Kren, F.

AU - Kullander, S.

AU - Kupsc, A.

AU - Lindberg, K.

AU - Marciniewski, P.

AU - Meier, R.

AU - Morosov, B.

AU - Pauly, C.

AU - Pettersson, H.

AU - Petukhov, Y.

AU - Povtorejko, A.

AU - Pricking, A.

AU - Ruber, R. J. M. Y.

AU - Schonning, K.

AU - Scobel, W.

AU - Shwartz, B.

AU - Skorodko, T.

AU - Sopov, V.

AU - Stepaniak, J.

AU - Tegner, P. -E.

AU - Thorngren-Engblom, P.

AU - Tikhomirov, V.

AU - Turowiecki, A.

AU - Wagner, G. J.

AU - Wolke, M.

AU - Zabierowski, J.

AU - Zartova, I.

AU - Zlomanczuk, J.

PY - 2009/2/6

Y1 - 2009/2/6

N2 - 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.

AB - 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.

KW - EFFECTIVE-MASS-SPECTRUM

KW - GEV-C

KW - MESON PRODUCTION

KW - CROSS-SECTIONS

KW - S-WAVE

KW - PI-PI

KW - ENHANCEMENT

KW - COLLISIONS

KW - MOMENTUM

KW - MODEL

U2 - 10.1103/PhysRevLett.102.052301

DO - 10.1103/PhysRevLett.102.052301

M3 - Article

SN - 0031-9007

VL - 102

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 052301

ER -

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

Abstract

Keywords / Materials (for Non-textual outputs)

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