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1.	Adlarson, Patrik, et al. (author) Importance of d-wave contributions in the charge symmetry breaking reaction dd -> He-4 pi(0) 2018 In: Physics Letters B. - : ELSEVIER SCIENCE BV. - 0370-2693 .- 1873-2445. ; 781, s. 645-650 Journal article (peer-reviewed)abstract This letter reports a first quantitative analysis of the contribution of higher partial waves in the charge symmetry breaking reaction dd -> He-4 pi(0) using the WASA-at-COSY detector setup at an excess energy of Q = 60 MeV. The determined differential cross section can be parametrized as d sigma/d Omega = a + b cos(2) theta, where theta is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are a = (1.55 +/- 0.46(stat)(-0.8)(+0.32)(syst)) pb/sr and b = (13.1 +/- 2.1(stat)(-2.7)(+1.0)(syst)) pb/sr. The data are compatible with vanishing p-waves and a sizable d-wave contribution. This finding should strongly constrain the contribution of the A isobar to the dd -> He-4 pi(0) reaction and is, therefore, crucial for a quantitative understanding of quark mass effects in nuclear production reactions.
2.	Adlarson, Patrik, et al. (author) Backward single-pion production in the pd -> He-3 pi(0)reaction with WASA-at-COSY 2018 In: European Physical Journal A. - : SPRINGER. - 1434-6001 .- 1434-601X. ; 54:9 Journal article (peer-reviewed)abstract New data on the production of single neutral pions in the pd -> He-3 pi(0) reaction are presented. For fifteen proton beam momenta between p(p) = 1.60GeV/c and p(p) = 1.74 GeV/c, differential cross sections are determined over a large fraction of the backward hemisphere. Since the only previous systematic measurements of single-pion production at these energies were made in collinear kinematics, the present work constitutes a significant extension of the current knowledge on this reaction. Even this far above the production threshold, significant changes are found in the behaviour of the angular distributions over small intervals in beam momentum.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Yamamoto, A. (2); Adlarson, Patrik (2); Kupsc, Andrzej (2); Goswami, A. (2); Kuzmin, A (2); Calén, Hans (2); show more...; Marciniewski, Pawel (2); Wolke, Magnus (2); Roy, A. (2); Johansson, Tord (2); Khoukaz, A. (2); Ciepal, I. (2); Kulessa, P. (2); Pysz, K. (2); Ritman, J. (2); Serdyuk, V. (2); Smyrski, J. (2); Augustyniak, W. (2); Bashkanov, M. (2); Bergmann, F. S. (2); Berlowski, M. (2); Buescher, M. (2); Clement, H. (2); Czerwinski, E. (2); Engels, R. (2); Erven, W. (2); Eyrich, W. (2); Fedorets, P. (2); Foehl, K. (2); Fransson, Kjell (2); Goldenbaum, F. (2); Grigoryev, K. (2); Hejny, V. (2); Jarczyk, L. (2); Kamys, B. (2); Kemmerling, G. (2); Kistryn, S. (2); Kleines, H. (2); Klos, B. (2); Krzemien, W. (2); Lalwani, K. (2); Lorentz, B. (2); Magiera, A. (2); Maier, R. (2); Marianski, B. (2); Moskal, P. (2); Morsch, H. -P (2); Ohm, H. (2); del Rio, E. Perez (2); Prasuhn, D. (2); show less...

University: Uppsala University (2)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2018 (2)

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