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Non-Coplanar Nuclei in Heavy-Ion Reactions
Abstract:In recent times, we noticed an interesting and important role of non-coplanar degree-of-freedom (Φ = 00) in heavy ion reactions. Using the dynamical cluster-decay model (DCM) with Φ degree-of-freedom included, we have studied three compound systems 246Bk∗, 164Yb∗ and 105Ag∗. Here, within the DCM with pocket formula for nuclear proximity potential, we look for the effects of including compact, non-coplanar configurations (Φc = 00) on the non-compound nucleus (nCN) contribution in total fusion cross section σfus. For 246Bk∗, formed in 11B+235U and 14N+232Th reaction channels, the DCM with coplanar nuclei (Φc = 00) shows an nCN contribution for 11B+235U channel, but none for 14N+232Th channel, which on including Φ gives both reaction channels as pure compound nucleus decays. In the case of 164Yb∗, formed in 64Ni+100Mo, the small nCN effects for Φ=00 are reduced to almost zero for Φ = 00. Interestingly, however, 105Ag∗ for Φ = 00 shows a small nCN contribution, which gets strongly enhanced for Φ = 00, such that the characteristic property of PCN presents a change of behaviour, like that of a strongly fissioning superheavy element to a weakly fissioning nucleus; note that 105Ag∗ is a weakly fissioning nucleus and Psurv behaves like one for a weakly fissioning nucleus for both Φ = 00 and Φ = 00. Apparently, Φ is presenting itself like a good degree-of-freedom in the DCM.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1339291Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 770
 R. K. Gupta, in Clusters in Nuclei, Lecture Notes in Physics 818, edited by C. Beck, Vol.I, (Springer Verlag, Berlin, 2010), pp. 223-265; and earlier references there in it.
 J. Blocki et al., Proximity Forces, Ann. Phys. (N.Y.) 105, 427 (1977).
 R. K. Gupta and M. Bansal, Heavy Ion Reactions Studied on Wong and Dynamical Cluster-Decay Models Using Proximity Potential for Non-Coplanar Nuclei, Int. Rev. Phys. (IREPHY) 5, 74 (2011).
 M. Bansal, Study of Fusion Reactions Using Deformed and Oriented Nuclei, Ph.D. thesis, Panjab University, Chandigarh, 2012, Chapters 5 and 6 (Unpublished).
 S. K. Arun, R. Kumar, and R. K. Gupta, Fusion-evaporation cross-sections for the 64Ni+100Mo reaction using the dynamical cluster-decay model, J. Phys. G: Nucl. Part. Phys. 36, 085105 (2009).
 M. Bansal et al., Dynamical cluster-decay model using various formulations of a proximity potential for compact non-coplanar nuclei: Application to the 64Ni+100Mo reaction, Phys. Rev. C 86, 034604 (2012).
 S. Chopra et al., One neutron and noncompound-nucleus decay contributions in the 12C+93Nb reaction at energies near and below the fusion barrier, Phys. Rev. C 88, 014615 (2013).
 S. Chopra et al., Non-coplanar compact configurations of nuclei and non-compound-nucleus contribution in the fusion cross section of the 12C+93Nb, Phys. Rev. C 93, 024603 (2016).
 A. Kaur et al., Compound nucleus formation probability PCN determined within the dynamical cluster-decay model for various hot fusion reactions, Phys. Rev. C 90, 024619 (2014).
 S. Chopra et al., Determination of the compound nucleus survival probability Psurv for various hot fusion reactions based on the dynamical cluster-decay model, Phys. Rev. C 91, 034613 (2015).
 R. K. Gupta et al., Generalized proximity potential for deformed, oriented nuclei, Phys. Rev. C 70, 034608 (2004).
 M. Manhas and R. K. Gupta, Proximity potential for deformed, oriented nuclei:“Gentle” fusion and “hugging” fusion, Phys. Rev. C 72, 024606 (2005).
 R. K. Gupta et al., Optimum orientations of deformed nuclei for cold synthesis of superheavy elements and the role of higher multipole deformations, J. Phys. G: Nucl. Part. Phys. 31, 631 (2005).
 R. K. Gupta et al., Compactness of the 48Ca induced hot fusion reactions and the magnitudes of quadrupole and hexadecapole deformations, Phys. Rev. C 73, 054307 (2006).
 B. R. Behera et al., Entrance-channel effect in fusion fragment anisotropies from 11B+235U and 14N+232Th systems, Phys. Rev. C 64, 041602(R) (2001).
 B. R. Behera et al., Fission fragments angular distributions for the systems 14N+232Th and 11B+235U at near and sub-barrier energies, Phys. Rev. C 69, 064603 (2004).
 C. L. Jiang et al., Hindrance of heavy-ion fusion at extreme sub-barrier energies in open-shell colliding systems, Phys. Rev. C 71, 044613 (2005).
 T. Ahmad et al., Reaction Mechanisms in 12C+93Nb system: Excitation functions and recoil range distributions below 7 MeV/u, Int. J. Mod Phys. E 20, 645 (2011).