Analysis of59Co (?, x p y n z ?) reactions up to 170 MeV incident ? energy

Abstract

Excitation functions of several reactions induced by cr particles with energy up to 170 MeV on 59C0 are presented and analysed, together with published particle spectra, in the framework of the Exciton model. The satisfactory reproduction of proton and e spectra as well as of excitation functions of simple reactions in which pre-equilibrium emission dominates, indicates that a realistic description of the e-nucleus interaction mechanism and of the de-excitation of the composite nucleus has been achieved. Present results confirm that the interaction of the cr with individual nucleons of the target nucleus is the dominant process.Nuclear Reactions: 59C0 (e, xpynzcO, 10<E~<170 MeV; Measured excitation functions; Calculated Excitation Functions and particle spectra.

Alpha induced reactions

“…This occurs either in the case of simple reactions populating product nuclides near the target nucleus or when the emission of fast ~ particles is far from being negligible. Direct comparison of the results obtained with these approaches, with those obtained with present model (see, in the case of 59Co (a, xpyn) reaction, [3,5], in the case of 93Nb(~,xpyn) and ~~ xpyn) reaction, respectively, [2] and [6]) show that most of the discrepancies between data and theory disappear when a more realistic description of the a-nucleus interaction and of the de-excitation process of the composite nucleus is made. Holmgren et al [8,9] reached the conclusion that the cross section for binary jragmentation of the a could be the major contribution to the ~ reaction cross section at high incident energies.…”

“…The comparison of the results achieved in the analysis of ~ particle and proton induced reactions on Ag90 nuclei [2,4], shows that in both cases the experimental data are reproduced with a comparable accuracy, by using the same set of basic parameters to describe the de-excitation of the composite nucleus, also if-in the two cases the cross sections for reactions corresponding to the emission of the same particles may differ in absolute value by an order of magnitude. The comparison of the obtained results with the results of comprehensive calculations based on different models [5,6] shows that the theoretical description proposed in [1][2][3] represents a significant improvement over the previous ones, eliminating many existing discrepancies between data and theory. New experimental data, referring to nuclei within a much broader mass range (from A ~ 50 to A ~ 230), have been now analysed in order to assess the A dependence of the basic parameters entering the calculation.…”

“…In Sect. 2 of this paper, we will briefly summarize the model that has been proposed in [1][2][3]. In particular the A dependence of the calculation parameters and some new improvements upon previous calculations will be discussed.…”

Nuclear model analysis of excitation functions of proton and deuteron induced reactions on 64 Zn and 3 He- and α-particle induced reactions on 59 Co leading to the formation of copper-61: Comparison of major production routes

“…Hermanne at al. (1999) reported cross Cohen et al, 1954;Barrandon et al, 1975;Levkovskij, 1991;Hermanne et al, 1999;Szelecsényi et al, 2005;Uddin et al, 2007 64 Zn(d,αn) 61 Cu À 1.38 Baron and Cohen, 1963;Williams and Irvine, 1963;Bissem et al, 1980;Bonardi et al, 2003;Tárkányi et al, 2004;Daraban et al, 2008 59 Co( 3 He,n) 61 Cu 6.61 Homma and Murakami, 1976;Michel and Galas, 1983;Jastrzebski, et al, 1986;Nagame et al, 1988;Szelecsényi et al, 2004;Fenyvesi et al, 2004;Pichard et al, 2011 59 Co(α,2n) 61 Cu À 13.9 Sterns, 1962;Budzanowski et al, 1967;Zhukova et al, 1972;Homma and Murakami, 1976;Michel and Brinkmann, 1980;Gadioli et al, 1984;Jastrzebski, et al, 1986;Levkovskij, 1991;Skulski et al, 1992;Singh et al, 1993;Szelecsényi et al, 2002;Ansari et al, 2004 sections only above 32 MeV on nat Zn target, so those data were not considered in the evaluation. Szelecsényi et al (2005) performed extensive cross section measurements up to 100 MeV; however, in Fig.…”

“…59 Co(α,2n) 61 Cu A number of groups measured the cross sections for production of 61 Cu through this reaction (Sterns, 1962;Budzanowski et al, 1967;Zhukova et al, 1972;Homma and Murakami, 1976;Michel and Brinkmann, 1980;Gadioli et al, 1984;Jastrzebski, et al, 1986;Levkovskij, 1991;Skulski et al, 1992;Singh et al, 1993;Szelecsényi et al, 2002;Ansari et al, 2004; see Table 1). All the experimental data are shown in Fig.…”