Abstract
The Coordinated Research Project (CRP) with the code F41032 has been launched by the International Atomic Energy Agency (IAEA) in 2016 as a 5-year project with the scientific goal being two-fold: 1) updating the 2000 photonuclear data library and 2) constructing a reference database of photon strength functions. We report the experimental technique and methodology used for the former goal and selected giant-dipole resonance (GDR) data updated in the IAEA-CRP.
Highlights
The last IAEA photonuclear data library (IAEATECDOC-1178) [1] was published in 2000 which has compiled and evaluated the photoneutron data of 164 isotopes of 48 elements from 2H to 241Pu
It is well known that there is a long-standing discrepancy between the Livermore and Saclay data of partial photoneutron cross sections for 19 nuclei from 51V to 238U among 42 nuclei commonly measured at Livermore and Saclay [2]
We have newly obtained photoneutron data for 11 nuclei, 9Be, 59Co, 89Y, 103Rh, 139La, 159Tb, 165Ho, 169Tm, 181Ta, 197Au, and 209Bi in the PHOENIX collaboration performed in the γ-ray beam line of the NewSUBARU synchrotron radiation facility
Summary
Quasi-monochromatic γ-ray beams were produced in collisions of laser photons with relativistic electrons in a straight line of the NewSUBARU storage ring. The laser Compton-scattered (LCS) γ-ray beam is energytunable by changing the electron beam energy; a laserphoton beam is energy-boosted by a factor of 4.6 × to 3.3 × and converted to a γ-ray beam in the MeV range. The LCS γ-ray beam is accompanied by synchrotron radiation whose energy is significantly lower than the energy of the maximum γ-ray yield; the synchrotron radiation did not interfere photoneutron cross section measurements. This is essentially different from background γ rays (positron bremsstrahlung) produced in the positron annihilation in flight [6]. Backgroud neutrons of the accelerator and cosmicray origin were measured during the laser off
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