Photon flux monitor for a mono-energetic gamma ray source

Pywell, R. E.; Mavrichi, O.; Wurtz, Ward; Wilson, Richard

doi:10.1016/j.nima.2009.04.014

Cited by 24 publications

(15 citation statements)

References 5 publications

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“…For this experiment, the 60 MeV γ-ray beam had an energy spread of ∼4.5% and an on-target intensity of ∼10 7 γ/s [28]. The collimated beam is incident on a five-scintillator-paddle system [29] which detects recoil electrons and positrons from photoelectric, Compton and pair-production processes and has been directly calibrated using a 25.4 cm diameter, 35.6 cm long NaI detector. The five-scintillator-paddle system provides a means of measuring the instantaneous γ-ray intensity without creating a source of background radiation in the experiment.…”

Section: Methodsmentioning

confidence: 99%

Compton scattering from6Li at 60 MeV

et al. 2012

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Compton scattering cross sections from 6 Li have been measured at scattering angles of 40• -160• using a nearly monoenergetic 60 MeV photon beam at the High Intensity Gamma-Ray Source (HI γS). This represents the first precision measurement of Compton scattering on 6 Li. A phenomenological model provides an estimate of the sensitivity of the 6 Li(γ,γ) 6 Li cross section to the nucleon isoscalar electromagnetic polarizabilities αs and βs.

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Section: Methodsmentioning

confidence: 99%

Compton scattering from6Li at 60 MeV

et al. 2012

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“…The charged particles produced in the radiator were detected to determine the photon beam intensity. The efficiency of the beam flux monitor was measured at low photon fluxes using a large NaI(Tl) detector located downstream of the target and was corrected for multiple hits at high photon rates [23]. For the present experiment, the on-target intensity of the circularly polarized photon beams was ∼ 10 7 γ/s.…”

Section: Methodsmentioning

confidence: 99%

Compton scattering from He4 at the TUNL HIγS facility

Li¹,

Ahmed²,

Banu³

et al. 2020

Phys. Rev. C

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Differential cross sections for elastic Compton scattering from 4 He have been measured with high statistical precision at the High Intensity γ-ray Source at laboratory scattering angles of 55°, 90°, and 125°using a quasi-monoenergetic photon beam with a weighted mean energy value of 81.3 MeV. The results are compared to previous measurements and similar fore-aft asymmetry in the angular distribution of the differential cross sections is observed. This experimental work is expected to strongly motivate the development of effective-field-theory calculations of Compton scattering from 4 He to fully interpret the data.

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“…The measured intensity, which ranged from 3 × 10 6 γ/s to 2 × 10 7 γ/s depending on the beam energy, was continuously monitored with an array of five plastic scintillating paddles as described in Ref. [11]. The five-paddle array was calibrated using the intensity measurements from the large NaI detector.…”

Section: Experimental Descriptionmentioning

confidence: 99%

Polarization asymmetries in theBe9(γ,n0)reaction

et al. 2015

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Measurements of the 9 Be(γ,n 0 ) reaction were performed using nearly 100% linearly polarized, high-intensity, and nearly-monoenergetic γ-ray beams having energies between 5.5 MeV and 15.5MeV at the High Intensity γ-ray Source (HIγS) located at Duke University and Triangle Universities Nuclear Laboratory. Eighteen liquid scintillator detectors were used to measure neutron yields parallel and perpendicular to the plane of beam polarization. Polarization asymmetries, which are the differences between yields observed in detectors located in-plane and out-of-plane divided by their sums, were measured for the neutrons which left the residual nucleus ( 8 Be) in its ground state, termed the n 0 group. Asymmetries between 0.4 to 0.7 were discovered over this energy region in addition to a clear trend of increasing asymmetries with increasing beam energy. A prediction of the polarization asymmetry based on a pure E1 direct capture model shows good agreement with the experimental measurements. These data and the prediction could be of interest for methods that rely on neutron measurements following photofission to identify the presence of special nuclear material.

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Photon flux monitor for a mono-energetic gamma ray source

Cited by 24 publications

References 5 publications

Compton scattering from6Li at 60 MeV

Compton scattering from6Li at 60 MeV

Compton scattering from He4 at the TUNL HIγS facility

Polarization asymmetries in theBe9(γ,n0)reaction

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