Puzzle of Complete Fusion Suppression in Weakly Bound Nuclei: A Trojan Horse Effect?

Lei, Jin; Moro, Antonio M.

doi:10.1103/PhysRevLett.122.042503

Puzzle of Complete Fusion Suppression in Weakly Bound Nuclei: A Trojan Horse Effect?

Journal Article · Fri Feb 01 00:00:00 EST 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.042503· OSTI ID:1544123

Lei, Jin ^[1]; Moro, Antonio M. ^[2]

Ohio Univ., Athens, OH (United States); Univ. de Sevilla (Spain)
Univ. de Sevilla (Spain)

Experimental studies of nuclear collisions involving light weakly-bound nuclei show a systematic suppression of the complete fusion cross section by ~30% with respect to the expectation for tightly bound nuclei, at energies above the Coulomb barrier. Although it is widely accepted that the phenomenon is related to the weak binding of these nuclei, the origin of this suppression is not fully understood. In here, we present a novel approach that provides the complete fusion for weakly bound nuclei and relates its suppression to the competition between the different mechanisms contributing to the reaction cross section. The method is applied to the ^6,7Li+²⁰⁹Bi reactions, where we find that the suppression of complete fusion is mostly caused by the flux associated with non-elastic breakup modes, such as the partial capture of the projectile (incomplete fusion), whereas the elastic breakup mode is found to play a minor role. Finally, we demonstrate that the large α yields observed in these reactions can be naturally explained as a consequence of a Trojan Horse mechanism.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1544123

Alternate ID(s):: OSTI ID: 1493108

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 122; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Origins of Incomplete Fusion Products and the Suppression of Complete Fusion in Reactions of Li 7 Cook, K. J.; Simpson, E. C.; Bezzina, L. T. Physical Review Letters, Vol. 122, Issue 10 https://doi.org/10.1103/physrevlett.122.102501	journal	March 2019
Unraveling the Reaction Mechanisms Leading to Partial Fusion of Weakly Bound Nuclei Lei, Jin; Moro, Antonio M. Physical Review Letters, Vol. 123, Issue 23 https://doi.org/10.1103/physrevlett.123.232501	journal	December 2019
MITA: A Multilayer Ionization-chamber Telescope Array for low-energy reactions with exotic nuclei Ma, N. R.; Yang, L.; Lin, C. J. The European Physical Journal A, Vol. 55, Issue 6 https://doi.org/10.1140/epja/i2019-12765-7	journal	June 2019
How to extend the chart of nuclides? Adamian, G. G.; Antonenko, N. V.; Diaz-Torres, A. The European Physical Journal A, Vol. 56, Issue 2 https://doi.org/10.1140/epja/s10050-020-00046-7	journal	February 2020
How to extend the chart of nuclides? Adamian, G. G.; Antonenko, N. V.; Diaz-Torres, A. GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt https://doi.org/10.15120/gsi-2021-00366	text	January 2020
Unraveling the reaction mechanisms leading to partial fusion of weakly bound nuclei Lei, Jin; Moro, Antonio M. arXiv https://doi.org/10.48550/arxiv.1910.06625	text	January 2019

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