Prompt and delayed gamma rays induced by epithermal and fast neutrons with indium

Abstract

The emission of prompt and delayed gamma rays from (n,γ) and (n,n´γ) reactions induced by irradiation of indium with epithermal and fast neutrons was investigated with the instrument FaNGaS operated at Heinz-Maier-Leibnitz Zentrum (MLZ) in Garching. The average neutron energy of the neutron spectrum was 2.30 MeV. The measurement was done at an angle of 90° between neutron beam and detector. A total of 136 prompt gamma lines from which 42 are related to the capture of epithermal and fast neutrons and 94 to the inelastic scattering of fast neutrons were detected together with the delayed gamma lines of the activation products 113mIn, 114m2In, 115mIn, 116m2In and 116mIn. Intensities and neutron spectrum averaged isotopic partial cross section of the gamma lines are presented. Additionally the neutron spectrum averaged cross sections of the reactions, 113In(n,n´)113mIn, 113In(n,γ)114m2In, 115In(n,n´)15mIn, 115In(n, γ)116m2In and 115In(n, γ)116mIn were determined from the corresponding delayed gamma rays of the formed isotopes as 143 ± 22, 288 ± 13 194 ± 18, 201 ± 10 and 508 ± 24 mb respectively. The various results obtained were found consistent with the literature data. However, our measurement indicate the need to reevaluate the cross section of the 115In(n,γ)116m2In reaction for thermal neutrons.

Gamma emission from interaction of fission neutrons on nickel and zirconium

“…f n ≈1. The gammaray self-absorption of the foils was determined numerically using the Monte Carlo transport simulation code PHITS (Particle and Heavy Ion Transport code System) Version ( 3) [32] as described in [6]. The dependence of the factor for gamma-ray self-absorption f Eγ on the gamma energy E γ is shown in Fig.…”

“…Such data are also required in other fields of nuclear science and technology [4]. With the aim of developing a comprehensive database on (n,n′γ) reactions, prompt gamma rays induced by fission neutrons on carbon, oxygen, aluminum, chlorine, calcium, titanium, iron, copper, indium, cerium and terbium were measured with the FaNGaS instrument and their associated fissionneutron spectrum-averaged production cross sections were determined [2,3,[5][6][7][8]. Relative intensities of the gamma rays were found to agree reasonably with the values provided by the only existing database for (n,n′γ) reactions: the "Atlas of Gamma-ray spectra from the Inelastic Scattering of Reactor Fast Neutrons" published by Demidov et al in 1978 [9].…”

Prompt gamma rays from fast neutron inelastic scattering on aluminum, titanium and copper

“…f n ≈1. The gamma-ray self-absorption of the foils was determined numerically using the Monte Carlo transport simulation code PHITS (Particle and Heavy Ion Transport code System) Version 3.02 [16] as described in [4]. The dependence of the factor for gamma-ray self-absorption f E on the gamma energy Eγ is shown on Fig.…”

“…The detection of neutron-induced gamma radiation is performed with a well shielded high-purity germanium detector positioned perpendicular to the neutron beam axis. In previous works we reported on the prompt gamma-rays induced by fast neutrons on iron [3] and on the prompt and delayed gamma rays produced by epithermal and fast neutrons on indium [4]. In this work, the results from the measurement of aluminum, titanium and copper are presented and compared to the data provided in the "Atlas of Gamma-rays from the Inelastic Scattering of Reactor Fast Neutrons" published in 1978 by Demidov et al [5].…”

New setup for measurement of prompt gammas from neutron interactions

“…Despite its importance, the prompt gamma production in present nuclear data libraries is generally discrepant [4]. Fortunately, many experimenters have recently focused on this area, with [5][6][7] being among the most important recent publications on the subject.…”