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.

arXiv comment17 pages, 6 figures

References in corpus (25)

• Alpha decay half-lives of new superheavy elements
• Photoproduction of eta-mesic 3He
• The alpha-particle based on modern nuclear forces
• Eta bound states in nuclei: a probe of flavour-singlet dynamics
• The role of $N^{\ast }(1535)$ in $pp\to pp\varphi$ and ${\pi }^{-}p\to n\varphi$ reactions
• Search for the eta-mesic 4He with WASA-at-COSY detector
• Are there eta-Helium bound states?
• Interaction of eta mesons with nuclei
• Role of vector and pseudoscalar mesons in understanding $1/2^{-}$ $N^{\ast }$ and $\Delta$ resonances
• Quantum reflection and dwell times of metastable states
• The $\eta NN$-system at low energy within a three-body approach
• Mixing of pseudoscalar-baryon and vector-baryon in the $J^P=1/2^{-}$ sector and the $N^{\ast }$(1535) and $N^{\ast }$(1650) resonances
• Strong decay of low-lying $S_{11}$ and $D_{13}$ nucleon resonances to pseudoscalar mesons and octet baryons
• Search for Quasi Bound $\eta$ Mesons
• Eta-mesic nuclei: past, present, future
• The neutron charge form factor in helium-3
• Small eta-N scattering lengths favour eta-d and eta-alpha states
• Production of Eta-Mesons in Collisions of Nucleons and Delta-Resonances
• Etaprime interactions with nucleons and nuclei
• On Quasibound N* Nuclei
• Spectroscopy of ${\eta }^{\prime }$-nucleus bound states at GSI and FAIR --- very preliminary results and future prospects ---
• Search for eta-mesic nuclei with WASA-at-COSY
• Search for the eta-mesic Helium bound state with the WASA-at-COSY facility
• The Delta N -> NN transition in finite nuclei
• QCD symmetries and the eta and etaprime in nuclei

Cited by in corpus (6)

• Etaprime and Eta Mesons with Connection to Anomalous Glue
• Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility
• Constraining the optical potential in the search for eta-mesic 4He
• $\eta$-nucleus interaction from the $d+d$ reaction around the $\eta$ production threshold
• Luminosity determination for the proton-deuteron reaction using pd -> 3He eta channel with WASA-at-COSY detector
• Status of the search for $\eta$-mesic nuclei with particular focus on $\eta$-Helium bound states