A fit to deuteron photodisintegration data up to 200 MeV using the Nijmegen 1993 potential

Jaus, W.; Woolcock, W.S.

doi:10.1016/0375-9474(96)00262-x

Cited by 3 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The differential cross sections were extracted using the back D 2 O detector for the determination of the integrated photon flux. As mentioned before, the total cross section of 2 H( γ, n)p was previously well determined[64]. At 11.4 MeV, the total cross section of this reaction is 1257 ± 36 µb[100].…”

supporting

confidence: 52%

“…The first one was a 3-paddle (paddle consists of plastic scintillators.) system in the beam, as shown in This method was based on the fact that the total cross section for 2 H( γ, n)p was well determined [64]. Given that the electric dipole transitions dominate this reaction, the angular distribution of the neutrons is assumed to be of a sin 2 (θ CM ) form in the center of mass frame.…”

Section: Beam Monitoringmentioning

confidence: 99%

“…Since the back detectors were running in a deadtime free mode, and the DAQ system (seven main detectors) had deadtime, this needs to be corrected (We can also correct the raw counts, same effect). N t is the D 2 O target thickness, dσ dΩ is the differential cross section determined from the total cross section [64] and the angular distribution sin 2 (θ CM ). ε is the detector acceptance which includes both extended target effect and the detection efficiency from the GEANT4 simulation.…”

Section: Integrated Photon Number Determinationmentioning

confidence: 99%

“…The target performance was stable throughout both running periods with an average polarization around 38% at 14.7 MeV and 42% at 11.4 MeV. There was a downtime of about a week between these energies for the replacement of a broken RF amplifier in the storage ring.At both energies, we carried out a measurement of 2 H( γ, n)p using a D 2 gas target.This measurement serves as the calibration purpose since the expected number of neutrons can be calculated given the fact that the total cross section of 2 H( γ, n)p is well determined[64] and the angular distribution of the neutrons is assumed to be in the form of sin 2 (θ CM ), as mentioned in Section 3.2.At HIγS, it takes several hours 5 to flip the γ-ray beam helicity. This means each beam flip would be at the expense of the precious beam time.…”

mentioning

confidence: 99%

See 3 more Smart Citations

First Study of Three-body Photodisintegration of <sup>3</sup>He with Double Polarizations at HIyS

Zong

2010

View full text Add to dashboard Cite

This dissertation describes the first measurement of three-body photodisintegration of polarized 3 He (γ 3 He → npp) with a circularly polarized photon beam. This measurement was carried out at the High Intensity γ-Ray Source(HIγS) facility located at Duke University Free Electron Laser Laboratory and the incident photon energy was 11.4 MeV. A high-pressure polarized 3 He target based on spin exchange optical pumping (SEOP) of hybrid alkali was employed. Two methods-Nuclear Magnetic Resonance (NMR) and Electron Paramagnetic Resonance (EPR)-were used to measure the polarization, which was determined to be ∼ 42%. The data from the experiment were analyzed and a GEANT4 simulation was carried out to determine the corrections for finite geometry, neutron multiple scattering and detector efficiencies used in this experiment. The results are compared to the state-of-the-art three-body calculations and agreements are observed within rather large statistical uncertainties of the measurement. This experiment represents the first measurement of the asymmetry using spin-dependent 3 He photodisintegration. The unpolarized differential cross section and helicity-dependent differential cross-section difference results are also presented and compared to the same theoretical calculations followed by a discussion of the results. Total cross section is also extracted using two different methods and agrees well with the theoretical prediction. New developments including a Sol-Gel coated pyrex 3 He cell since the experiment iv are then presented. The in-beam test results of the aforementioned target cell from May 2009 test run are included and the prospect of future three-body photodisintegration is discussed in the end. v To my parents Qingchao Xiao and Youxin Zong, also to Jidi Liu.

show abstract

supporting

confidence: 52%

Section: Beam Monitoringmentioning

confidence: 99%

Section: Integrated Photon Number Determinationmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

First Study of Three-body Photodisintegration of <sup>3</sup>He with Double Polarizations at HIyS

Zong

2010

View full text Add to dashboard Cite

show abstract

“…6. The deuterium photodisintegration absolute cross section has been measured to better than 3% in the energy range of the current experiments [15].…”

Section: Three-body Photodisintegration Of Hementioning

confidence: 94%

Few-body Studies at the High Intensityγ-Ray Source (HIγS)

Ahmed

Perdue

Stave

et al. 2010

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The HIγS facility is making it possible to perform studies of few body systems at a new level of accuracy and precision. A study of the photodisintegration of the deuteron using 100% linearly polarized beams at 14 and 16 MeV has determined the splittings of the three p-wave amplitudes involved in this process for the first time. These results show that the relativistic contributions, which when included in the theory lead to a positive value of the GDH integrand above 8 MeV, are valid. The near threshold data on the photodisintegration of the deuteron provide results which are used to extract the forward spin-polarizability of the deuteron for the first time. The experimental value is in good agreement with a recent effective field theory calculation. Measurements of the absolute differential cross section of the 3 He(γ,n)pp reaction have been completed at three γ-ray energies. The measurements were made at incident γ-ray energies of 12.8, 13.5, and 14.7 MeV. It has been found that the shape of the outgoing neutron energy distribution at a given scattering angle at 12.8 MeV disagrees with current theoretical predictions. At these energies, the shape is consistent with a phase-space-only shape. At the higher energies, the measurements agree with theory.

show abstract

Investigation of the d(γ,n)p reaction for gamma beam monitoring at ELI-NP

et al. 2016

View full text Add to dashboard Cite

A: The Extreme Light Infrastructure -Nuclear Physics facility will deliver brilliant gamma beams with high spectral density and a high degree of polarization starting in 2018 in Bucharest-Magurele, Romania. Several monitoring instruments are proposed for measuring the spectral, temporal, and spatial characteristics of the gamma beam. The d(γ,n)p reaction has been investigated for its use in determining the gamma beam parameters in a series of measurements carried out at the High Intensity Gamma Source, Durham, U.S.A.. Measurements of the emitted neutrons have been performed using liquid scintillator and 6 Li-glass neutron detectors at several incident gamma energies between 2.5 to 20 MeV. The experimental results presented in this paper have shown that an instrument based on the d(γ,n)p reaction can be used to monitor the intensity and polarization of the gamma beam to be produced at ELI-NP. K: Beam-line instrumentation (beam position and profile monitors; beam-intensity monitors; bunch length monitors); Instrumentation and methods for time-of-flight (TOF) spectroscopy; Neutron detectors (cold, thermal, fast neutrons); Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators) 1Corresponding author.

show abstract

A fit to deuteron photodisintegration data up to 200 MeV using the Nijmegen 1993 potential

Cited by 3 publications

References 31 publications

First Study of Three-body Photodisintegration of <sup>3</sup>He with Double Polarizations at HIyS

First Study of Three-body Photodisintegration of <sup>3</sup>He with Double Polarizations at HIyS

Few-body Studies at the High Intensityγ-Ray Source (HIγS)

Investigation of the d(γ,n)p reaction for gamma beam monitoring at ELI-NP

Contact Info

Product

Resources

About