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

Abstract

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.

Authors:
 [1];  [2];  [3];  [1];  [4];  [1];  [5];  [6];  [4];  [7];  [7];  [8];  [2];  [2];  [2];  [2];  [2];  [8];  [1];  [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)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1209233
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 86; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Stefanini, A. M., Montagnoli, G., Esbensen, H., Corradi, L., Courtin, S., Fioretto, E., Goasduff, A., Grebosz, J., Haas, F., Mazzocco, M., Michelagnoli, C., Mijatović, T., Montanari, D., Pasqualato, G., Parascandolo, C., Scarlassara, F., Strano, E., Szilner, S., Toniolo, N., and Torresi, D. Transfer couplings and hindrance far below the barrier for 40 Ca + 96 Zr. United States: N. p., 2015. Web. doi:10.1051/epjconf/20158600056.
Stefanini, A. M., Montagnoli, G., Esbensen, H., Corradi, L., Courtin, S., Fioretto, E., Goasduff, A., Grebosz, J., Haas, F., Mazzocco, M., Michelagnoli, C., Mijatović, T., Montanari, D., Pasqualato, G., Parascandolo, C., Scarlassara, F., Strano, E., Szilner, S., Toniolo, N., & Torresi, D. Transfer couplings and hindrance far below the barrier for 40 Ca + 96 Zr. United States. doi:10.1051/epjconf/20158600056.
Stefanini, A. M., Montagnoli, G., Esbensen, H., Corradi, L., Courtin, S., Fioretto, E., Goasduff, A., Grebosz, J., Haas, F., Mazzocco, M., Michelagnoli, C., Mijatović, T., Montanari, D., Pasqualato, G., Parascandolo, C., Scarlassara, F., Strano, E., Szilner, S., Toniolo, N., and Torresi, D. Thu . "Transfer couplings and hindrance far below the barrier for 40 Ca + 96 Zr". United States. doi:10.1051/epjconf/20158600056. https://www.osti.gov/servlets/purl/1209233.
@article{osti_1209233,
title = {Transfer couplings and hindrance far below the barrier for 40 Ca + 96 Zr},
author = {Stefanini, A. M. and Montagnoli, G. and Esbensen, H. and Corradi, L. and Courtin, S. and Fioretto, E. and Goasduff, A. and Grebosz, J. and Haas, F. and Mazzocco, M. and Michelagnoli, C. and Mijatović, T. and Montanari, D. and Pasqualato, G. and Parascandolo, C. and Scarlassara, F. and Strano, E. and Szilner, S. and Toniolo, N. and Torresi, D.},
abstractNote = {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.},
doi = {10.1051/epjconf/20158600056},
journal = {EPJ Web of Conferences},
number = ,
volume = 86,
place = {United States},
year = {2015},
month = {1}
}

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