Deeply bound pionic atoms from the (γ,p) reaction in nuclei

Hirenzaki, S.; Oset, E.

doi:10.1016/s0370-2693(02)01165-6

Cited by 13 publications

(7 citation statements)

References 16 publications

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“…The momentum transfer is the important kinematical variable which determines the experimental feasibility of the formation of meson-nuclear bound states. Indeed, deeply bound pionic atoms were discovered experimentally at the recoilless kinematics [38,39,34,40]. In the formation of ω states we find that the recoilless condition is satisfied at E γ ∼ 2.7 GeV, as in Ref.…”

Section: Production Of Bound ω States In the (γP) Reactionsupporting

confidence: 76%

Possible ω bound states in nuclei produced with the (γ,p) reaction

et al. 2007

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We perform calculations for ω production in nuclei by means of the (γ, p) reaction for photon energies and proton angles suited to running and future experiments in present Laboratories. For some cases of possible ω optical potentials we find clear peaks which could be observable provided a good resolution in the ω energy is available. We also study the inclusive production of π 0 γ in nuclei around the ω energy and find a double hump structure for the energy spectra, with a peak around a π 0 γ energy of m ω − 100 MeV, which could easily be misidentified by a signal of a bound ω state in nuclei, while it is due to a different scaling of the uncorrelated π 0 γ production and ω production with subsequent π 0 γ decay.

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Section: Production Of Bound ω States In the (γP) Reactionsupporting

confidence: 76%

Possible ω bound states in nuclei produced with the (γ,p) reaction

et al. 2007

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“…As discussed in Refs. [37,[67][68][69], we think that the (γ , p) reaction with GeV photon beam is one of the appropriate reactions for our purpose and it can be performed in existing facilities like SPring-8. We consider the (γ ,p) reactions for the η-and η -mesic nuclei formation.…”

Section: Formation Spectra Of Mesic Nucleimentioning

confidence: 99%

η- andη'-mesic nuclei andUA(1)anomaly at fi

2006

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We discuss theoretically the possibility of observing the bound states of the η and η (958) mesons in nuclei. We apply the NJL model to study the η and η meson properties at finite density and calculate the formation cross sections of the η and η bound states with the Green function method for (γ ,p) reaction. We also discuss the experimental feasibility at photon facilities like SPring-8. The contributions due to the ω meson production are also included to obtain the realistic (γ ,p) spectra. We conclude that we can expect to observe resonance peaks in (γ ,p) spectra for the formation of meson bound states and we can deduce new information on η and η properties at finite density. These observations are believed to be essential to know the possible mass shift of η and deduce new information on the effective restoration of the U A (1) anomaly in the nuclear medium.

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“…The (γ,p) reaction is another experimental tool for formation of the hadron-nucleus system and originally proposed in Refs. [10][11][12][13]. The (γ,p) reaction, as well as the (d, 3 He) reaction, is able to satisfy recoilless condition at the meson creation energy.…”

Section: Introductionmentioning

confidence: 99%

Formation of mesic nuclei by reactions

Nagahiro¹,

Jido²,

Hirenzaki³

2005

Nuclear Physics A

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We present a theoretical study on formation rates of η and ω meson-nucleus systems induced by (γ, p) reactions on nuclear targets at ideal recoilless condition. We find that the smaller distortion effect in the (γ, p) reaction enables us to investigate properties of the mesons created deeply inside nucleus more clearly. We also consider excitation of scalar-isoscalar (σ) mode in nucleus in order to investigate spectral enhancement around two-pion threshold caused by partial restoration of chiral symmetry. We conclude that valuable information of meson-nucleus interactions can be extracted from global structure of the missing mass spectra in the (γ, p) reaction.

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Deeply bound pionic atoms from the (γ,p) reaction in nuclei

Cited by 13 publications

References 16 publications

Possible ω bound states in nuclei produced with the (γ,p) reaction

Possible ω bound states in nuclei produced with the (γ,p) reaction

η- andη'-mesic nuclei andUA(1)anomaly at fi

Formation of mesic nuclei by reactions

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