Studies of multiparticle photonuclear reactions in natural iron induced by 2.5 GeV bremsstrahlung

Pham Duc Khue1, Kim Tien Thanh1, Nguyen Thi Hien 1
1 Institute of Physics, VAST, 10 Dao Tan, Ba Dinh, Hanoi, Vietnam

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Abstract

Multiparticle photonuclear reactions produced on natural iron target with maximum end-point energy of 2.5 GeV bremsstrahlung have been investigated by using the activation method in combination with g-ray spectrometric techniques. The g-spectra were measured with a high energy resolution g-spectrometer based on HPGe detector. The radioactive residual nuclei formed via nuclear reactions were identified based on their half-lives and g-ray energies. The yields of reaction products were determined based on their g-activities. In order to improve the accuracy of the experimental results a series of g-spectra were measured at different cooling times and the necessary corrections were made. More than twenties radioactive nuclei formed via the following photonuclear reactions: natFe(g,xn), natFe(g,xnyp) and natFe(g,p-xn) have been identified and their yields have been determined. The present experimental results are compared with reference data and analyzed with an empirical formula given by Rudstam.

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References

[1] G. Rudstam, “The evaporation step in spallation reactions”, Nucl. Phys. A 126, 401 (1969).
[2] J. R.Wu and C.C. Chang, “Pre-equilibrium particle decay in the photonuclear reactions”, Phys. Rev. C 16, 1812 (1977).
[3] K. Lindgren and G. G. Jonsson, “Photon-induced nuclear reaction above 1 GeV”, Nucl. Phys., A197, 71(1972).
[4] A.S. Danagulyan, N.A.Demekhina and G.A. Vartapetyan, “Photonuclear reactions in medium weight nuclei 51V, 55Mn and Cu”, Nucl. Phys. A 285, 482 (1977).
[5] S. Shibata, M. Imamura, T. Miyachi and M. Mutou, “Photonuclear spallation reactions in Cu”,¬¬ Phys. Rev. C 35, 254 (1987).
[6] G. Kumbartzki and U. Kim, “High-energy photonuclear reactions in vanadium and iron”, Nucl. Phys. A 176, 23 (1971).
[7] T. Sato, K. Shin, S.Ban, Y. Namoto, H.Nakamura, H.Hirayama, “Measurements of high – energy photonuclear reaction yields in the 2.5 GeV electron beam stop”, Nucl. Instr. and Meth. A 401, 476 (1997).
[8] Hiromitsu Haba, “Recoil Studies of photonuclear reactions at intermediate energies”, J. Nucl. Radiochem. Sci. 3, 11 (2002).
[9] Koh Sakamoto, “Radiochemical study on photonuclear reactions of complex nuclei at intermediate energies”, J. Nucl. Radiochem. Sci. 4, 9 (2003).
[10] Nguyen Van Do, Pham Duc Khue and Kim Tien Thanh, Le Truong Son, Guinyum Kim, Young Seok Lee, Youngdo Oh, Hee-Seock Lee, Moo-Hyun Cho, In Soo Ko and Won Namkung, “Isomeric cross-section ratios for the 45Sc(,n)44m,gSc, natTi(,xn1p)44m,gSc, natFe(,xn5p)44m,gSc and natCu(,xn8p)44m,gSc reactions induced by 2.5 GeV Bremsstrahlung”, Nucl. Instr. and Meth., B266, 5080 (2008).
[11] Nguyen Van Do, Pham Duc Khue, Kim Tien Thanh and Nguyen Thi Thanh Van, “High energy photon induced nuclear reactions in natural copper”, Comm. in Phys., Special issue, 19,177 (2009).
[12] H. S. Lee, S. Ban, T. Sato, K. Shin, J. S. Bak, C. W. Chung, H. D. Choi, “Photoneutron Spectra from Thin Targets Bombarded with 2.0 GeV Electrons”, J. Nucl. Sci. and Tech. Supplement 1, 207 (2000).
[13] Van Do Nguyen, Duc Khue Pham, Duc Thiep Tran, Van Duan Phung, Y. Seok Lee, Hee-Seock Lee, Moo-Hyun Cho, In Soo Ko and Won Namkung, A.K.M. Moinul Haque Meaze, K Devan and Guinyun Kim. “Measurement of Neutron and Photon Distributions by Using an Activation Technique at the Pohang Neutron Facility”. J. Korean Phys. Soc., 48, 382 (2006).
[14] R. B. Fiestone, L.P. Ekström, “Table of Radioactive Isotopes”, Version 2.1, January 2004, web: http://ie.lbl.gov/toi.html.
[15] M. L. Terranova and O.A.P.Tavares, “Total Nuclear Photoabsorption Cross Section in the Range 0.2-1.0 GeV for Nuclei throughout the Periodic Table”, Phys. Scri. 49, 267 (1994).