Photoabsorption on nuclei in the energy range 0.5–2.6 GeV

Muccifora, V.; Bianchi, N.; Deppman, A.; Sanctis, E. De; Mirazita, M.; Polli, E.; Rossi, P.; Burgwinkel, R.; Hannappel, J.; Klein, Frank; Menze, D.; Schwille, W. J.; Wehnes, F.

doi:10.1103/physrevc.60.064616

Cited by 40 publications

(21 citation statements)

References 33 publications

(44 reference statements)

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“…A.3. Gamma-ray absorption cross section on the 27 Al in the region of the giant dipole resonance (GDR) and ∆ resonance (Ahrens et al 1975;Bianchi et al 1996;Muccifora et al 1999). …”

Section: Discussionmentioning

confidence: 99%

Resonant absorption troughs in the gamma-ray spectra of QSO

Iyudin

Reimer

Burwitz

et al. 2005

A&A

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Abstract. We report the very first evidence of the possible detection of γ-ray resonant absorption along the line of sight towards γ-ray bright quasars (QSOs), like 3C 279, 3C 273, PKS 0528+0134, and BL Lacertae. These detections resulted from the analysis of COMPTEL and EGRET data that were collected either during monitoring campaigns of the Virgo and galactic anticenter regions by the Compton Gamma Ray Observatory (CGRO) or during ToO observations of QSOs flares. We discuss three resonant absorption mechanisms that affect the γ-ray spectrum of point-like sources when crossing the surrounding warm and cold absorbers, as well as the potential of this γ-ray photon absorption method to constrain the abundance of the absorber. We detected two absorbers along the line of sight towards γ-ray bright QSOs, one at the QSO rest frame redshift and another at approximately zero redshift. We tentatively identify the latter with an absorber in the Galactic halo, while the former is undoubtedly caused by photon absorption in the host galaxy of the QSO. We discuss the advantages and drawbacks of this method in studies of absorbers in different astrophysical environments and compare this new method to absorber studies at X-ray or other wavelengths. We applied this γ-ray absorption method to identify a few of the EGRET unidentified (EUID) sources as QSOs, and determine their redshifts.

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“…A.3. Gamma-ray absorption cross section on the 27 Al in the region of the giant dipole resonance (GDR) and ∆ resonance (Ahrens et al 1975;Bianchi et al 1996;Muccifora et al 1999). …”

Section: Discussionmentioning

confidence: 99%

Resonant absorption troughs in the gamma-ray spectra of QSO

Iyudin

Reimer

Burwitz

et al. 2005

A&A

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“…Furthermore, the reduction in the incident photon flux due to photon shadowing has been taken into account by multiplying the observed η ′ y i e l db y1 . 1 7 [41][42][43]. A rather flat angular distribution is observed at low energies near the production threshold on a free nucleon (E thr γ = 1.447 GeV).…”

Section: A Differential Cross Sections For the η ′ Photoproduction Omentioning

confidence: 91%

Determination of the real part of theη′-Nb optical potential

Nanova¹,

Friedrich²,

Metag³

et al. 2016

Phys. Rev. C

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ReuseItems deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.PHYSICAL REVIEW C 94, 025205 (2016) Determination of the real part of the η ′ -Nb optical potential The excitation function and momentum distribution of η ′ mesons have been measured in photoproduction off 93 Nb in the energy range of 1.2-2.9 GeV. The experiment has been performed with the combined Crystal Barrel and MiniTAPS detector system, using tagged photon beams from the ELSA electron accelerator. Information on the sign and magnitude of the real part of the η ′ -Nb potential has been extracted from a comparison of the data with model calculations. An attractive potential of −(41 ± 10(stat) ± 15(syst)) MeV depth at normal nuclear matter density is deduced within model uncertainties. This value is consistent with the potential depth of −(37 ± 10(stat) ± 10(syst)) MeV obtained in an earlier measurement for a light nucleus (carbon). This relatively shallow η ′ -nucleus potential will make the search for η ′ -nucleus bound states more difficult.

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“…[16,13] we have described in detail how we calculate photonuclear reactions. The total cross section for any observable is given as an incoherent sum over the contributions from all nucleons in the nucleus where the final state interactions of the particles produced in the primary γN collisions are calculated using the transport equation (1). For invariant energies below 2.1 GeV (corresponding to E γ = 1.88 on a free nucleon at rest) we describe elementary γN collisions as in Ref.…”

Section: Photon-nucleon Interactionmentioning

confidence: 99%

“…Effective mass number as function of photon energy for photoabsorption on 12 C. The experimental data are taken from Refs. [31] (circles), [32] (squares), [33] (up triangles), [1] (down triangles). The latter two are obtained from the experimental data on the total cross sections by using the parameterization of the cross section on a single nucleon from Ref.…”

Section: Appendix B: Strangeness Production In Photon-nucleon Collisionsmentioning

confidence: 99%

Photoproduction of mesons in nuclei at GeV energies

Effenberger

Mosel

2000

Phys. Rev. C

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In a transport model that combines initial state interactions of the photon with final state interactions of the produced particles we present a calculation of inclusive photoproduction of mesons in nuclei in the energy range from 1 to 7 GeV. We give predictions for the photoproduction cross sections of pions, etas, kaons, antikaons, and $\pi^+\pi^-$ invariant mass spectra in ^{12}C and ^{208}Pb. The effects of nuclear shadowing and final state interaction of the produced particles are discussed in detail.Comment: Text added in summary in general reliability of the method, references updated. Phys. Rev. C (2000) in pres

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Photoabsorption on nuclei in the energy range 0.5–2.6 GeV

Cited by 40 publications

References 33 publications

Resonant absorption troughs in the gamma-ray spectra of QSO

Resonant absorption troughs in the gamma-ray spectra of QSO

Determination of the real part of theη′-Nb optical potential

Photoproduction of mesons in nuclei at GeV energies

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