Photonuclear reactions on 112,118,124 Sn, nat Te, and nat Hf targets
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CLEI Experiment
Photonuclear Reactions on
112,118,124
Sn,
nat
Te, and
nat
Hf Targets
A. S. Danagulyan1) , G. H. Hovhannisyan1)* , T. M. Bakhshiyan1), R. H. Avagyan2) , A. E. Avetisyan2) , I. A. Kerobyan2) , and R. K. Dallakyan2) Received December 20, 2013; in final form, March 11, 2014
Abstract—The yields of products of photonuclear reactions on tin targets enriched in the isotopes 112,118,124 Sn and on Te and HfO2 targets of natural isotopic composition were measured. The targets were irradiated at the linear electron accelerator of the A.I. Alikhanian National Science Laboratory (Yerevan Physics Institute) at the electron energy of Ee = 40 MeV. The dependence of the product yields on the nucleonic composition of the targets was discussed. The isomeric ratios were obtained for the 119m,g Te, 121m,g Te, 117m,g In, and 123m,g Sn products. The experimental data in question were compared with their theoretical counterparts calculated on the basis of the TALYS 1.4 code. The dependence of the isomeric ratios on the photon energy and on the mass number of the product is considered. DOI: 10.1134/S1063778814100056
INTRODUCTION Photonuclear reactions at intermediate energies have vigorously been studied for many years. Owing to those studies, it became possible to determine some general properties of nuclei and parameters of their individual levels. This served as a good basis for developing and refining various theoretical models. At the present time, there exist publications and international databases that combine all available experimental data on photonuclear reactions at energies lying in the region of and higher than the giant-dipoleresonance energy [1, 2]. However, some reactions have not yet been studied. For example, there are no experimental data on the yields of 173,175 Hf products that would originate from (γ, n) and (γ, p) reactions [1, 2]. The objective of the present study was to measure the yields of products of reactions that proceed on 112,118,124 Sn, nat Te, and nat Hf targets for the case where the endpoint energy of the bremsstrahlung spectrum is Eγ max = 40 MeV, as well as to measure and analyze the isomeric ratios for the products of the reactions 120 Te(γ, n)119m,g Te, 122 Te(γ, n)121m,g Te, 118 Sn(γ, p)117m,g In, and 124 Sn(γ, n)123m,g Sn and to compare the resulting experimental data with their counterparts calculated on the basis of the 1)
Yerevan State University, Alex Manoogian str. 1, Yerevan 0025, Republic of Armenia. 2) A.I. Alikhanian National Science Laboratory (Yerevan Physics Institute) (YerPhi), Alikhanian Brothers str. 2, Yerevan 0036, Republic of Armenia. * E-mail: [email protected]
TALYS 1.4 code. Currently available data on the isomeric ratios for the reactions 120 Te(γ, n)119m,g Te and 122 Te(γ, n)121m,g Te are limited to giant resonance region [3–6], while data on the isomeric ratios for the reactions 118 Sn(γ, p)117m,g In are very fragmentary [4, 5, 7–12]; finally, data on the isomeric ratios for the reactions 124 Sn(γ, n)123m,g Sn are scanty [3, 10]. An investigation of is
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