Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

Adlarson, P.; Klos, B.; Yuan, X.; Clement, H.; Kistryn, S.; Augustyniak, W.; Kupsc, Andrzej; Skorodko, T.; Doroshkevich, E.; Wronska, A.; Goswami, Ankita; Stassen, Rolf; Erven, Wilhelm; Berłowski, M.; Hauenstein, Florian; Shah, N. J.; Bhatt, Himani; Lorentz, Bernd; Stroher, H.; Heijkenskjold, L.; Hinterberger, F.; Weglorz, W.; Yurev, Leonid; Varma, R.; Lersch, Daniel; Siudak, R.; Ohm, Henner; Pysz, K.; Engels, Ralf; Niedzwiecki, S.; Jany, B. R.; Zipper, W.; Mikirtychiants, M.; Marianski, B.; Smyrski, J.; Kemmerling, Günter; Goslawski, P.; Klaja, J.; Wagner, G. J.; Zupranski, P.; Morsch, H. -P.; Sterzenbach, Guenter; Magiera, A.; Tolba, T.; Schmidt, Andreas; Zheng, C.; Eyrich, W.; Grigoryev, Kirill; Gullstrom, C. -O.; Yamamoto, A.; Kulessa, Pawel; Krapp, M.; Jany, A.; Calen, Hans; Krzemien, W.; Pricking, A.; Jarczyk, L.; Khan, Farha Anjum; Kamys, B.; Kleines, Harald; Goldenbaum, Frank; Wüstner, Peter; Demmich, K.; Büscher, Markus; Bardan, W.; Johansson, T.; Schadmand, Susan; Nandi, B. K.; Sawant, S.; Zlomanczuk, J.; Ritman, James; Bashkanov, M.; Sopov, V.; Hejny, Volker; Moskal, Pawel; Zurek, Maria; Rudy, Z.; Serdyuk, Valeriy; Sefzick, Thomas; Fransson, K.; Prasuhn, Dieter; Roy, A.; Fohl, K.; Plucinski, P.; Pyszniak, A.; Wurm, Patrick; Perez del Rio, E.; Skurzok, M.; Ozerianska, I.; Stephan, E.; Vlasov, P.; Khoukaz, A.; Szczurek, A.; Maier, Rudolf; Stockhorst, Hans; Zabierowski, J.; Pszczel, D.; Stepaniak, J.; Lalwani, K.; Zielinski, M. J.; Li, L.; Fedorets, Pavel; Podkopal, P.; Bergmann, F. S.; Coderre, Daniel; Bednarski, T.; Trzcinski, A.; Hoistad, B.; Wolke, Magnus; Hodana, Malgorzata; Czerwinski, E.; Siemaszko, M.; Marciniewski, P.; Redmer, C. F.

doi:10.1016/j.physletb.2013.03.019

Journal Article

FZJ-2013-03969

Isospin decomposition of the basic double-pionic fusion in the region of the ABC effect

Adlarson, P. ; Augustyniak, W. ; Bardan, W. ; Bashkanov, M. ; Bednarski, T. ; Bergmann, F. S. ; Berłowski, M. ; Bhatt, H.FZJ* ; Büscher, M.FZJ* ; Calen, H.FZJ* ; Clement, H. (Corresponding Author) ; Coderre, D.FZJ* ; Czerwinski, E. ; Demmich, K. ; Doroshkevich, E. ; Engels, R.ZEA-2*FZJ* ; Erven, W.ZEA-2*FZJ* ; Eyrich, W. ; Fedorets, P.FZJ* ; Fohl, K. ; Fransson, K. ; Goldenbaum, F.FZJ* ; Goslawski, P. ; Goswami, A.FZJ* ; Grigoryev, K.FZJ* ; Gullstrom, C. -. ; Hauenstein, F.FZJ* ; Heijkenskjold, L. ; Hejny, V.FZJ* ; Hinterberger, F. ; Hodana, M.FZJ* ; Hoistad, B. ; Jany, A. ; Jany, B. R. ; Jarczyk, L. ; Johansson, T. ; Kamys, B. ; Kemmerling, G.ZEA-2*FZJ* ; Khan, F. A.FZJ* ; Khoukaz, A. ; Kistryn, S. ; Klaja, J. ; Kleines, H.ZEA-2*FZJ* ; Klos, B. ; Krapp, M. ; Krzemien, W. ; Kulessa, P.FZJ* ; Kupsc, A.FZJ* ; Lalwani, K. ; Lersch, D.FZJ* ; Li, L. ; Lorentz, B.FZJ* ; Magiera, A. ; Maier, R.FZJ* ; Marciniewski, P. ; Marianski, B. ; Mikirtychiants, M. ; Morsch, H. -. ; Moskal, P.FZJ* ; Nandi, B. K. ; Niedzwiecki, S. ; Ohm, H.FZJ* ; Ozerianska, I. ; Perez del Rio, E. ; Plucinski, P. ; Podkopal, P. ; Prasuhn, D.FZJ* ; Pricking, A. ; Pszczel, D. ; Pysz, K. ; Pyszniak, A. ; Redmer, C. F. ; Ritman, J.FZJ* ; Roy, A. ; Rudy, Z. ; Sawant, S. ; Schadmand, S.FZJ* ; Schmidt, A.FZJ* ; Sefzick, T.FZJ* ; Serdyuk, V.FZJ* ; Shah, N. J. ; Siemaszko, M. ; Siudak, R. ; Skorodko, T. ; Skurzok, M. ; Smyrski, J. ; Sopov, V. ; Stassen, R.FZJ* ; Stepaniak, J. ; Stephan, E. ; Sterzenbach, G.FZJ* ; Stockhorst, H.FZJ* ; Stroher, H. ; Szczurek, A. ; Tolba, T. ; Trzcinski, A. ; Varma, R. ; Vlasov, P. ; Wagner, G. J. ; Weglorz, W. ; Wolke, M.FZJ* ; Wronska, A. ; Wüstner, P.ZEA-2*FZJ* ; Wurm, P.FZJ* ; Yamamoto, A. ; Yuan, X. ; Yurev, L.FZJ* ; Zabierowski, J. ; Zheng, C. ; Zielinski, M. J. ; Zipper, W. ; Zlomanczuk, J. ; Zupranski, P. ; Zurek, M.FZJ*

2013
North-Holland Publ. Amsterdam

Physics letters / B 721(4-5), 229 - 236 (2013) [10.1016/j.physletb.2013.03.019]

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Please use a persistent id in citations: http://hdl.handle.net/2128/13285 doi:10.1016/j.physletb.2013.03.019

Abstract: Exclusive and kinematically complete high-statistics measurements of the basic double pionic fusion reactions pn -> dpi0pi0, pn -> d pi+pi- and pp -> dpi+pi0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the dpi0pi0 channel exhibits the ABC effect, i.e. a low-mass enhancement in the pipi-invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the dpi+pi0 channel shows a smooth behavior consistent with the conventional t-channel Delta Delta process. The dpi+pi- data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.
Exclusive and kinematically complete high-statistics measurements of the basic double-pionic fusion reactions pn->d@p^0@p^0, pn->d@p^+@p^- and pp->d@p^+@p^0 have been carried out simultaneously over the energy region of the ABC effect using the WASA detector setup at COSY. Whereas the isoscalar reaction part given by the d@p^0@p^0 channel exhibits the ABC effect, i.e. a low-mass enhancement in the @p@p-invariant mass distribution, as well as the associated resonance structure in the total cross section, the isovector part given by the d@p^+@p^0 channel shows a smooth behavior consistent with the conventional t-channel @D@D process. The d@p^+@p^- data are very well reproduced by combining the data for isovector and isoscalar contributions, if the kinematical consequences of the isospin violation due to different masses for charged and neutral pions are taken into account.

Keyword(s): isoscalar ; isovector ; p p: fusion ; p n ; fusion ; pi: pair production ; channel cross section: energy dependence ; Juelich COSY PS ; mass spectrum: two-pion ; mass enhancement ; WASA ; experimental results ; p nucleon --> deuteron 2pi