Transfer couplings and hindrance far below the barrier for ⁴⁰ Ca + ⁹⁶ Zr

Journal Article · Thu Jan 29 00:00:00 EST 2015 · EPJ Web of Conferences

DOI:https://doi.org/10.1051/epjconf/20158600056· OSTI ID:1209233

Stefanini, A. M. ^[1]; Montagnoli, G. ^[2]; Esbensen, H. ^[3]; Corradi, L. ^[1]; Courtin, S. ^[4]; Fioretto, E. ^[1]; Goasduff, A. ^[5]; Grebosz, J. ^[6]; Haas, F. ^[4]; Mazzocco, M. ^[7]; Michelagnoli, C. ^[7]; Mijatović, T. ^[8]; Montanari, D. ^[2]; Pasqualato, G. ^[2]; Parascandolo, C. ^[2]; Scarlassara, F. ^[2]; Strano, E. ^[2]; Szilner, S. ^[8]; Toniolo, N. ^[1]; Torresi, D. ^[2]

---

1. INFN, Laboratori Nazioali di Legnaro, Padova (Italy)
2. Universita di Padova, and INFN, Padova (Italy)
3. Argonne National Lab. (ANL), Argonne, IL (United States)
4. Universite de Strasbourg, Cedex (France)
5. Universite Paris-Sud, Orsay (France)
6. Polish Academy of Sciences, Cracow (Poland). Inst. of Nuclear Physics.
7. Università di Padova, and INFN, Padova (Italy)
8. Ruder Boskovic Inst., Zagreb (Croatia)

The sub-barrier fusion excitation function of ⁴⁰Ca + ⁹⁶Zr has been measured down to cross sections ≃2.4µb, i.e. two orders of magnitude smaller than obtained in the previous experiment, where the sub-barrier fusion of this system was found to be greatly enhanced with respect to ⁴⁰Ca + ⁹⁰Zr, and the need of coupling to transfer channels was suggested. The purpose of this work was to investigate the behavior of ⁴⁰Ca + ⁹⁶Zr fusion far below the barrier. The smooth trend of the excitation function has been found to continue, and the logarithmic slope increases very slowly. No indication of hindrance shows up, and a comparison with ⁴⁸Ca + ⁹⁶Zr is very useful in this respect. A new CC analysis of the complete excitation function has been performed, including explicitly one- and two-nucleon Q >0 transfer channels. Such transfer couplings bring significant cross section enhancements, even at the level of a few µb. Locating the hindrance threshold, if any, in ⁴⁰Ca + ⁹⁶Zr would require challenging measurements of cross sections in the sub-µb range.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1209233
• Journal Information: EPJ Web of Conferences, Vol. 86; ISSN 2100-014X
• Publisher: EDP Sciences
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS