Home > Publications database > Importance of d-wave contributions in the charge symmetry breaking reaction $dd \to {}^4\text{He}\pi^0$ > print

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005     20250129092415.0
024 7 _ |a arXiv:1709.01060
|2 arXiv
024 7 _ |a 2128/15257
|2 Handle
024 7 _ |a altmetric:24778715
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037 _ _ |a FZJ-2017-06364
100 1 _ |a Adlarson, P.
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245 _ _ |a Importance of d-wave contributions in the charge symmetry breaking reaction $dd \to {}^4\text{He}\pi^0$
260 _ _ |c 2017
336 7 _ |a Preprint
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336 7 _ |a Electronic Article
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336 7 _ |a ARTICLE
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336 7 _ |a Output Types/Working Paper
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500 _ _ |a 3 figures
520 _ _ |a This 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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693 _ _ |0 EXP:(DE-Juel1)WASA-at-COSY-20170712
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700 1 _ |a Augustyniak, W.
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700 1 _ |a Engels, Ralf W.
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700 1 _ |a Zurek, Maria
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