Haba H.

Kikunaga H.

Ohtsuki T.

Takamiya K.

English

紀要類（bulletin）departmental bulletin pape

Kikunaga, H.

308661

Takamiya, K.

308662

Ohtsuki, T.

308663

Haba, H.

308664

Tohoku University Repository (TOUR) / 東北大学機関リポジトリ

Measurement of Alpha-induced Reaction CrossSections for Cr Isotopes on Natural Ti著者 Kikunaga H., Takamiya K., Ohtsuki T., Haba H.journal orpublication titleCYRIC annual reportvolume 2014-2015page range 49-51year 2015URL http://hdl.handle.net/10097/00120745 49  CYRIC Annual Report 2014-2015    V. 1.  Measurement of Alpha-induced Reaction Cross Sections for Cr Isotopes on Natural Ti    Kikunaga H.1, Takamiya K.2, Ohtsuki T.2, and Haba H.3  1Research Center for Electron Photon Science, Tohoku University 2Research Reactor Institute, Kyoto University 3RIKEN Nishina Center    Introduction Chromium is one of essential biotrace elements in some animals but also can be toxic in high concentrations. Understanding the behavior of chromium in animals, plants, and environment is important and influential on the various fields such as biological sciences. The radioactive tracer technique has been widely recognized as a powerful tool for behavior analysis of elements in trace amount. The isotopes 48Cr (Half-life: 21.6 h), 49Cr (42.3 min), and 51Cr (27.7 d) have potential as radiotracers because of their suitable half-lives. In this work, the cross sections for the reactions natTi(α, X)48Cr and natTi(α, X)49Cr up to 75 MeV were measured to produce these isotopes efficiently and quantitatively.  Experimental The excitation functions of these reactions were measured by the stacked-foil technique. The schematic diagram of the target stacks containing natural Ti (99.5% pure) and Al (99.9% pure) foils are illustrated in Figs. 1 (a) and (b). The target stacks shown in Figs. 1 (a) and (b) were irradiated for 30 min. with an α-particle beam delivered from the RIKEN K70 AVF Cyclotron and the model 680 Cyclotron at Cyclotron and Radioisotope Center (CYRIC), Tohoku University, respectively. The cyclotrons were operated at a beam energy of 50 MeV for RIKEN and 80 MeV for CYRIC with a mean current of around 0.4 μA. After the irradiation, the target foils were enclosed in a polyethylene film separately and were subjected to γ-ray spectrometry using a high-purity germanium detector. The incident beam energy and flux were determined by activation of the monitor foil technique using the natTi(α, X)51Cr and 27Al(α, X)22,24Na reactions. The reference data were obtained  50  from the IAEA Reference Data1). The energy loss in each foil was calculated using the TRIM code2).  Results The cross sections for the natTi(α, X)48Cr and natTi(α, X)49Cr reaction obtained in this work are shown in Fig. 2. For comparison, the earlier experimental data3–6) of the natTi(α, X)48Cr reaction and the values calculated using the Talys 1.6 code7) with default parameters are shown in Fig. 3. The cross sections of 48Cr obtained in this work is in good agreement with the earlier experimental data. The calculated values with the Talys code reproduce the experimental values of 48Cr and 49Cr with a reasonable accuracy although each peak position of the excitation functions is deviated slightly.  References  1) IAEA-Tecdoc-1211 2001 Charged particle cross section database for medical radioisotope production: diagnostic radioisotopes and monitor reactions (IAEA, Vienna, 2001). 2) Ziegler JF, et al., The stopping and range of ions in solids (Pergamon Press, New York, 1985). 3) Michel R, et al., Radiochim Acta 32 (1983) 173. 4) Weinreich R, et al., Appl Radiat Isot 31 (1980) 223. 5) Hermanne A, et al., Nucl Instrum Meth B 152 (1999) 187. 6) Peng X, et al., Nucl Instrum Meth B 140 (1998) 9. 7) Koning AJ, et al., ”TALYS-1.0”, Proc Int Conf Nucl Data Sci Technol ND2007, Nice, France, 2007-04 (EDP Sciences, 2008) p.211.                  Figure 1.  Schematic diagram of the target stacks for the measurement of the excitation function (a) from 8.4 to 50.4 MeV (b) from 44.4 to 75.3 MeV.   (a) (b)  51               Figure 2.  Cross section for the natTi(α,X)48Cr and natTi(α,X)48Cr reactions.              Figure 3.  Comparison with the experimental data obtained and the calculated values. 

Measurement of Alpha-induced Reaction Cross Sections for Cr Isotopes on Natural Ti

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Measurement of Alpha-induced Reaction Cross Sections for Cr Isotopes on Natural Ti

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