Momentum distribution of N${}^{\ast }$ in nuclei

Abstract

Due to its dominance in the low energy eta-nucleon interaction, the S11 N${}^{\ast }$(1535) resonance enters as an important ingredient in the analyses of experiments aimed at finding evidence for the existence of eta-mesic nuclei. The static properties of the resonance get modified inside the nucleus and its momentum distribution is used in deciding these properties as well as the kinematics in the analyses. Here we show that given the possibility for the existence of an N${}^{\ast }$-${}^3$He quasibound state, the relative momentum distribution of an N${}^{\ast }$ and ${}^3$He inside such a ${}^4$He is narrower than that of neutron-${}^3$He in ${}^4$He. Results for the N${}^{\ast }$-${}^{24}$Mg system are also presented. The present exploratory work could be useful in motivating searches of exotic N${}^{\ast }$-nucleus quasibound states as well as in performing analyses of eta meson production data.

17 pages, 6 figures

References in corpus (9)

• Alpha decay half-lives of new superheavy elements
• The role of $N^{\ast }(1535)$ in $pp\to pp\varphi$ and ${\pi }^{-}p\to n\varphi$ reactions
• Quantum reflection and dwell times of metastable states
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• Search for Quasi Bound $\eta$ Mesons
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Cited by in corpus (2)

• Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility
• $\eta$-nucleus interaction from the $d+d$ reaction around the $\eta$ production threshold