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000837451 005__ 20250129092415.0
000837451 0247_ $$2arXiv$$aarXiv:1709.01060
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000837451 037__ $$aFZJ-2017-06364
000837451 1001_ $$0P:(DE-HGF)0$$aAdlarson, P.$$b0
000837451 245__ $$aImportance of d-wave contributions in the charge symmetry breaking reaction $dd \to {}^4\text{He}\pi^0$
000837451 260__ $$c2017
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000837451 500__ $$a3 figures
000837451 520__ $$aThis letter reports the first measurement of the contribution of higher partial waves in the charge symmetry breaking reaction $dd \to {}^4\text{He}\pi^0$ using the WASA-at-COSY detector setup at an excess energy of $Q = 60$ MeV. The determined differential cross section can be parametrized as $\text{d}\sigma/\text{d}\Omega = a + b\cos^{2}\theta^*$, where $\theta^*$ is the production angle of the pion in the center-of-mass coordinate system, and the results for the parameters are $a = \left(1.55 \pm 0.46 (\text{stat}) ^{+0.32}_{-0.8} (\text{syst}) \right) \text{pb/sr}$ and $b = \left(13.1 \pm 2.1 (\text{stat}) ^{+1.0}_{-2.7} (\text{syst})\right) \text{pb/sr}$. The data are compatible with vanishing $p$-waves and a sizable $d$-wave contribution. This finding should strongly constrain the contribution of the $\Delta$ isobar to the $dd \to {}^4\text{He}\pi^0$ reaction and is therefore crucial for a quantitative understanding of quark mass effects in nuclear production reactions.
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000837451 7001_ $$0P:(DE-HGF)0$$aAugustyniak, W.$$b1
000837451 7001_ $$0P:(DE-HGF)0$$aBardan, W.$$b2
000837451 7001_ $$0P:(DE-HGF)0$$aBashkanov, M.$$b3
000837451 7001_ $$0P:(DE-HGF)0$$aBergmann, F. S.$$b4
000837451 7001_ $$0P:(DE-HGF)0$$aBerłowski, M.$$b5
000837451 7001_ $$0P:(DE-HGF)0$$aBondar, A.$$b6
000837451 7001_ $$0P:(DE-Juel1)131108$$aBüscher, M.$$b7
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000837451 7001_ $$0P:(DE-HGF)0$$aClement, H.$$b10
000837451 7001_ $$0P:(DE-HGF)0$$aCzerwiński, E.$$b11
000837451 7001_ $$0P:(DE-HGF)0$$aDemmich, K.$$b12
000837451 7001_ $$0P:(DE-Juel1)131141$$aEngels, Ralf W.$$b13
000837451 7001_ $$0P:(DE-Juel1)130632$$aErven, A.$$b14
000837451 7001_ $$0P:(DE-Juel1)133883$$aErven, W.$$b15
000837451 7001_ $$0P:(DE-HGF)0$$aEyrich, W.$$b16
000837451 7001_ $$0P:(DE-Juel1)131151$$aFedorets, P.$$b17
000837451 7001_ $$0P:(DE-HGF)0$$aFöhl, K.$$b18
000837451 7001_ $$0P:(DE-HGF)0$$aFransson, K.$$b19
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000837451 7001_ $$0P:(DE-HGF)0$$adel Rio, E. Perez$$b54
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000837451 7001_ $$0P:(DE-HGF)0$$aPyszniak, A.$$b59
000837451 7001_ $$0P:(DE-Juel1)131301$$aRitman, J.$$b60
000837451 7001_ $$0P:(DE-HGF)0$$aRoy, A.$$b61
000837451 7001_ $$0P:(DE-HGF)0$$aRudy, Z.$$b62
000837451 7001_ $$0P:(DE-HGF)0$$aRundel, O.$$b63
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000837451 7001_ $$0P:(DE-HGF)0$$aSitterberg, K.$$b70
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000837451 7001_ $$0P:(DE-HGF)0$$aSkurzok, M.$$b72
000837451 7001_ $$0P:(DE-HGF)0$$aSmyrski, J.$$b73
000837451 7001_ $$0P:(DE-HGF)0$$aSopov, V.$$b74
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000837451 7001_ $$0P:(DE-HGF)0$$aStepaniak, J.$$b76
000837451 7001_ $$0P:(DE-HGF)0$$aStephan, E.$$b77
000837451 7001_ $$0P:(DE-Juel1)131345$$aSterzenbach, G.$$b78
000837451 7001_ $$0P:(DE-Juel1)131346$$aStockhorst, H.$$b79
000837451 7001_ $$0P:(DE-Juel1)131349$$aStroeher, Hans$$b80
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000837451 7001_ $$0P:(DE-HGF)0$$aŻuprański, P.$$b90
000837451 7001_ $$0P:(DE-Juel1)159209$$aZurek, Maria$$b91$$eCorresponding author
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