Abstract
Photoexcitation yields of the ^115mIn metastable state were measured with Bremsstrahlung gamma beams over a range of endpoint energies between 4.5 and 18 MeV. An effective cross section of the ^115In(gamma,gamma')^115mIn photoexcitation cross section was determinedto reproduce the data. This cross section is built from a cross section calculated with the TALYS code, to which an enhancement is added at about 8.5 MeV.
Highlights
The production of radioactive nuclei is the basic principle of nuclear activation diagnostics
We investigate the possibility of using the production of the 115mIn isomer by photoexcitation to constrain the low energy part of the absolute energy distributions of these γ beams
Photoexcitation yields of 115mIn have been measured on an energy range between 4.5 and 18 MeV using a Bremsstrahlung photon source. These yields are used to test the experimental cross sections of the (γ, γ ) excitation process available in the literature, as well as a cross section obtained by calculation using the TALYS code
Summary
The production of radioactive nuclei is the basic principle of nuclear activation diagnostics. The yield of activated nuclei is measured after irradiation and is used to extract the energy distribution and absolute number of particles of the incident beam, provided the cross section of the activation reaction is well known [1]. It is a stable and easy to handle isotope, with a first excited isomeric state lying 336 keV above the ground state with a half-life of 4.49 h It is already used for the characterization of irradiation facilities [2], and as an activation standard in the context of inertial fusion experiments [3, 4]. The two radioactive isotopes are identified in the time decay spectrum by their half-lives, equal to 762.06(2) min for 64Cu and 9.673(8) min for 62Cu. Figure 2 shows an example of a γ-ray decay spectrum from an In sample irradiated at the electron beam energy of 17 MeV, measured offline during 15h of counting. The photopeaks at 559 and 725 keV sign the decay of 114gsIn, while the ones at 607 and 617 keV sign the decay of 112gsIn
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
