arXiv subjects

Jouni A. Niskanen

Publications and source records attributed to Jouni A. Niskanen.

2 recordsLinked to original sources

arXiv2018

On the width of the $Δ(1232)$ in $NΔ$ and $ΔΔ$ states

Due to the finite kinetic energy in the intermediate $NΔ$ state the (internal) energy available for mesonic decay is decreased and consequently the effective $NΔ$ width is suppressed in $NN$ scattering. The same can happen also in $Δ$$Δ$ case. Also the $NΔ$ angular momentum suppresses the width as well, while the effect of the initial $NN$ angular momentum is more subtle. The state dependence affects e.g. pion production observables and can also be seen as the origin of T=1 "dibaryons".

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arXiv2013

Binding vs. scattering length: $η$ in light nuclei

The possibility of etamesic nuclei remains an open problem in nuclear physics until now. Various calculations give contradictory predictions even for the lightest real nucleus $^3$He. In this paper we present the connection of the binding energy and width to the complex scattering length for heavier nuclei than this in the hope that, with knowledge of the final state interaction this could be useful in searches of possible bound states.

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