Evaluated cross sections of the σ(γ, nX) and σ(γ, 2nX) reactions on 112, 114, 116, 117, 118, 119, 120, 122, 124Sn isotopes

Allerton Press - Tập 74 - Trang 833-841 - 2010
V. V. Varlamov1, B. S. Ishkhanov1,2, V. N. Orlin1, V. A. Chetvertkova1
1Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia
2Physics Faculty, Moscow State University, Moscow, Russia

Tóm tắt

A combined analysis of experimental data on total and partial photoneutron reaction cross sections, obtained using bremsstrahlung γ-radiation and quasi-monoenergetic annihilation photon beams, was performed for nine Sn isotopes. The partial reactions σeval(γ, nX) and σeval(γ, 2nX) cross sections were evaluated using an approach free of the shortcomings of experimental neutron multiplicity sorting methods. This approach involves calculations within the photonuclear reaction model, based on Fermi gas densities and considering the effects of nucleus deformation, the isospin splitting of its giant dipole resonance (GDR), and experimental data on the total photoneutron cross sections σexp(γ, xn) = σexp(γ, nX) + 2σexp(γ, 2nX) = σexp(γ, n) + σexp(γ, np) + … + 2σexp(γ, 2n) + 2σexp(γ, 2np) + …. The evaluated σeval(γ, nX) and σeval(γ, 2nX) reactions cross sections were obtained using the introduced transition multiplicity functions F theor = σtheor(γ, 2nX)/σtheor(γ, xn) = σtheor(γ, 2nX)/[σtheor(γ, nX) + 2σtheor(γ, 2nX) + …]; and σeval.(γ, 2nX) = F theor.σexp.(γ, xn) = σeval(γ, nX) = (1 − 2F theor)σexp(γ, xn). The evaluated partial reaction cross sections were used to assess the total photoneutron reaction cross sections σeval(γ, sn) = σeval(γ, nX) + σeval(γ, 2nX) + … as functions of the mass number A. The GDR features of 112, 114, 116, 117, 118, 119, 120, 122, 124Sn isotopes were studied and are discussed here.

Tài liệu tham khảo

Kal’kulyator i graficheskaya sistema dlya parametrov atomnykh yader i kharakteristik yadernykh reakcij i radioaktivnykh raspadov, CDFE NIIYaF MGU (Calculator and Graph Engine for Atomic Nuclei Parameters and Nuclear Reactions and Radioactive Decays Features, MSU SINP CDFE). Available from: http://sdfe.sinp.msu.ru/services/calc_thr/calc_thr_ru.html

Bohr, A. and Mottelson, B.R., Nuclear Structure, New York: Benjamin, 1969, vol. 2.

Wolynec, E. and Martins, M.N., Revista Brasileira Fisica, 1987, vol. 17, p. 56.

Berman, B.L., Pywell, R.E., Dietrich, S.S., et al., Phys. Rev. C, 1987, vol. 36, p. 1286.

Varlamov, V.V. and Ishkhanov, B.S., INDC(CCP)-433, IAEA NDS, Vienna, 2002.

Varlamov, V.V., Peskov, N.N., Rudenko, D.S., et al., Vopr. Atomn. Nauki Tekhn. Yad. Konst., 2003, vol. 1–2, p. 48.

Sorokin, Yu.I. and Yur’ev, B.A., Yad. Fiz., 1974, vol. 20, p. 233.

Sorokin, Yu.I. and Yur’ev, B.A., Izv. AN. SSSR, Ser. Fiz., 1975, vol. 39, no. 1, p. 114.

Sorokin, Yu.I., Khrushchev, V.A., and Yur’ev, B.A., Izv. AN. SSSR, Ser. Fiz., 1972, vol. 36, no. 1, p. 180.

Fultz, S.C., Berman, B.L., Caldwell, J.T., et al., Phys. Rev., 1969, vol. 186, p. 1255.

Lepretre, A., Beil, H., Bergere, R., et al., Nucl. Phys. A, 1974, vol. 219, p. 39.

Chadwick, M.B., Oblozinsky, P., Hodgson, P.E., et al., Phys. Rev. C, 1991, vol. 44, p. 814.

Ishkhanov, B.S. and Orlin, V.N., Fiz. Elem. Chastits At. Yadra, 2007, vol. 38, p. 460 [Phys. Part. Nucl. (Engl. Transl.), 2007, vol. 38, no. 2, p. 232].

Ishkhanov, B.S. and Orlin, V.N., Yad. Fiz., 2008, vol. 71, p. 517 [Phys. At. Nucl. (Engl. Transl.), 2008, vol. 71, no. 3, p. 397].

Varlamov, V.V., Ishkhanov, B.S., Orlin, V.N., et al., Preprint of NIIYaF MGU-2009-3/847, Moscow, 2009.

Berman, B.L. and Fultz, S.C., Rev. Mod. Phys., 1975, vol. 47, p. 713.

Varlamov, V.V., Gudenko, Yu.Yu., Komarov, S.Yu., et al., Sb. tez. dokl.: 56-ya Mezhdunar. konf. po problemam yadernoi spektroskopii i strukture atomnogo yadra “Yadro-2006” (Proc. 56th Int. Conf. on on Nuclear Spectroscopy and Atomic Nuclear Structure “Nuclear-2006”), Sarov: RFYaTs VNIIEF, Sept. 4–8 2006, p. 37.

Laget, J.M, in Lecture Notes Physics, Arenhovel, H. and Saruis, A.M., Eds., Berlin: Springer-Verlag, 1981, vol. 137, p. 148.

Varlamov, A.V., Varlamov, V.V., Rudenko, D.S., et al., INDC(NDS)-394, IAEA NDS, Vienna, 1999.

Thông tin
Thông tin xuất bản

Allerton Press

Tập 74

833-841

Thông tin tác giả