Measurements for the energy and flux of laser Compton scattering γ-ray photons generated in an electron storage ring: NewSUBARU

Horikawa, Ken; Miyamoto, Shuji; Amano, Sho; Mochizuki, Takayasu

doi:10.1016/j.nima.2010.02.259

Cited by 59 publications

(35 citation statements)

References 9 publications

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“…In the BL01, energy-tunable and highly monochromatic γ -ray beams [20] are produced through inverse Compton scattering between Nd : YVO 4 laser photons (λ = 1064 nm) and relativistic electrons in the NewSUBARU storage ring. Fine pencil-like beams of the laser Compton scattering (LCS) γ rays were produced and measured with a 3.5 × 4.0 LaBr 3 (Ce) detector.…”

Section: Methodsmentioning

confidence: 99%

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of(γ,n)and(n,γ)reactions in the rare earth region

et al. 2015

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Photoneutron cross sections were measured for five stable Nd isotopes, 143,144,145,146,148 Nd, near neutron threshold with highly monochromatic laser-Compton scattering γ rays. The photoneutron data were compared with the calculations performed with the TALYS reaction code with inputs of the Skyrme Hartree-Fock-Bogoliubov (HFB) plus quasi-particle random phase approximation (QRPA) model and the axially symmetric deformed Gogny HFB plus QRPA model of E1 γ -ray strength. Using the γ -ray strength function constrained by the present photoneutron data, a thorough analysis of the reverse (n,γ ) cross sections is made. Radiative neutron capture cross sections for an s-process branching-point nucleus in the rare earth region, 147 Nd with the half-life 10.98 d, are deduced with the γ -ray strength function method. The impact of the newly evaluated 147 Nd(n,γ ) 148 Nd cross section on s-process nucleosynthesis is discussed.

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Section: Methodsmentioning

confidence: 99%

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of(γ,n)and(n,γ)reactions in the rare earth region

et al. 2015

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“…Here a wide range of quasi monochromatic γ beams [30] are produced in head-on collisions between laser photons and relativistic electrons, socalled laser Compton scattering (LCS). The energy of the laser photons increases from a few eV to several MeV in the collision.…”

Section: B the Photo-neutron Experimentsmentioning

confidence: 99%

Low-energy enhancement in theγ-ray strength functions ofGe73,74

et al. 2016

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The γ-ray strength functions and level densities of 73,74 Ge have been extracted up to the neutron separation energy S n from particle-γ coincidence data using the Oslo method. Moreover, the γ-ray strength function of 74 Ge above S n has been determined from photo-neutron measurements; hence these two experiments cover the range of E γ ≈ 1-13 MeV for 74 Ge. The obtained data show that both 73,74 Ge display an increase in strength at low γ energies. The experimental γ-ray strength functions are compared with M1 strength functions deduced from average B(M1) values calculated within the shell model for a large number of transitions. The observed low-energy enhancements in 73,74 Ge are adopted in the calculations of the 72,73 Ge(n,γ) cross sections, where there are no direct experimental data. Calculated reaction rates for more neutron-rich germanium isotopes are shown to be strongly dependent on the presence of the low-energy enhancement.

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“…The signals are read out and digitised using a set of AFTER chips [11] and associated Front End Cards. HARPO was set up in the NewSUBARU polarised beam line [12] in November 2014 where it was exposed to polarised light at 13 different photon energies from 1.74 MeV to 74.3 MeV. The polarised photon beam was produced by the Laser Compton scattering of an optical laser (different wavelengths were used to attain polarised beams of different energies) on a high-energy electron beam (0.6−1.5 GeV).…”

Section: Pos(ifs2017)180mentioning

confidence: 99%

Polarimetry and high angular resolution gamma-ray observations in the MeV regime using a novel detector concept

Horan¹

2017

Proceedings of 7th International Fermi Symposium — PoS(IFS2017)

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on behalf of the HARPO Collaboration †We have demonstrated, for the first time, that the polarisation of gamma rays in the MeV regime (< 74 MeV) can be measured using a novel detection technique, namely tracking the gamma-ray conversion pairs using a gaseous time projection chamber (TPC). HARPO (the Hermetic Argon Polarimeter) is, to date, the only instrument to have successfully carried out this measurement. Having demonstrated that a TPC can be used to detect and measure the polarisation of MeV gamma rays, we have begun a new, larger study with the goal of flying a TPC on a balloon to validate its preformance in a background-dominated environment. We will describe the mission concept for this gamma-ray polarimeter and also the science that can be addressed both with this demonstrator and with an ultimate, satellite-based instrument.7th Fermi Symposium 2017

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Measurements for the energy and flux of laser Compton scattering γ-ray photons generated in an electron storage ring: NewSUBARU

Cited by 59 publications

References 9 publications

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of(γ,n)and(n,γ)reactions in the rare earth region

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of(γ,n)and(n,γ)reactions in the rare earth region

Low-energy enhancement in theγ-ray strength functions ofGe73,74

Polarimetry and high angular resolution gamma-ray observations in the MeV regime using a novel detector concept

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