Neutron pre-emission at the fusion of 11Li halo nuclei with Si targets

Petrașcu, M.; Tanihata, I.; Kobayashi, Tooru; Isbasescu, A.; Petrascu, H.; Korsheninnikov, A. A.; Nikolski, E. Yu.; Fukuda, Satoshi; Kumagai, Hiroshi; Momota, S.; Ozawa, A.; Yoshida, Kôichi; Bordeanu, C.; David, I.; Lazǎr, I.; Mihai, Ioan; Vaman, G.; Giurgiu, M.

doi:10.1016/s0370-2693(97)00579-0

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…Many calculations have suggested that in the interaction of 11 Li with 208 Pb, the 11 Li will break up into two neutrons and the 9 Li core, which, in turn, will fuse with the 208 Pb nucleus. In the study of Petrascu et al [43] of the fusion of 9,11 Li with Si at 11.2-15.2 A MeV, they found evidence that the 9 Li fused with the Si, but in the case of 11 Li there was emission of one or two neutrons prior to fusion.…”

Section: A Prior Workmentioning

confidence: 98%

Interaction of11Li with208Pb

et al. 2013

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Background:11 Li is one of the most studied halo nuclei. The fusion of 11 Li with 208 Pb has been the subject of a number of theoretical studies with widely differing predictions, ranging over four orders of magnitude, for the fusion excitation function.Purpose: To measure the excitation function for the 11 Li + 208 Pb reaction. Methods: A stacked foil/degrader assembly of 208 Pb targets was irradiated with a 11 Li beam producing center of target beam energies from above barrier to near barrier energies ( 40 to 29 MeV). The intensity of the 11 Li beam (chopped) was 1250 p/s and the beam on-target time was 34 hours. The α-decay of the stopped EVRs was detected in an α-detector array at each beam energy in the beam-off period (the beam was on for ≤ 5 ns and then off for 170 ns).Results: The observed nuclidic yields of 212/215 At and 214 At are consistent with being produced in the complete fusion of 11 Li with 208 Pb. The observed yields of 213 At appear to be the result of the breakup of 11 Li into 9 Li + 2n, with the 9 Li fusing with 208 Pb. The magnitudes of the total fusion cross sections are substantially less than most theoretical predictions.Conclusions: It is possible to measure the evaporation residue production cross-sections resulting from the interaction of 11 Li with 208 Pb using current generation radioactive beam facilities. Both complete fusion and breakup fusion processes occur in the interaction of 11 Li with 208 Pb. An important breakup process leads to the fusion of the 9 Li fragment with 208 Pb .

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Section: A Prior Workmentioning

confidence: 98%

Interaction of11Li with208Pb

et al. 2013

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Section: A Prior Workmentioning

confidence: 99%

The interaction of 11Li with 208Pb

Vinodkumar,

Loveland,

Yanez

et al. 2012

Preprint

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Background: 11 Li is one of the most studied halo nuclei. The fusion of 11 Li with 208 Pb has been the subject of a number of theoretical studies with widely differing predictions, ranging over four orders of magnitude, for the fusion excitation function.Purpose: To measure the excitation function for the 11 Li + 208 Pb reaction.Methods: A stacked foil/degrader assembly of 208 Pb targets was irradiated with a 11 Li beam producing center of target beam energies from above barrier to near barrier energies ( 40 to 29 MeV). The intensity of the 11 Li beam (chopped) was 1250 p/s and the beam on-target time was 34 hours. The α-decay of the stopped EVRs was detected in an α-detector array at each beam energy in the beam-off period (the beam was on for ≤ 5 ns and then off for 170 ns). Results:The observed nuclidic yields of 212/215 At and 214 At are consistent with being produced in the complete fusion of 11 Li with 208 Pb. The observed yields of 213 At appear to be the result of the breakup of 11 Li into 9 Li + 2n, with the 9 Li fusing with 208 Pb. The magnitudes of the total fusion cross sections are substantially less than most theoretical predictions.Conclusions: It is possible to measure the evaporation residue production cross-sections resulting from the interaction of 11 Li with 208 Pb using current generation radioactive beam facilities.Both complete fusion and breakup fusion processes occur in the interaction of 11 Li with 208 Pb. An important breakup process leads to the fusion of the 9 Li fragment with 208 Pb .

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“…Neutron pre-emission at the fusion of a halo nucleus with a light target ( 11 Li + Si) has been recently observed in [1][2][3]. The measured pre-emission probability near 40% could be reasonably reproduced by a sharp cut-off approach in [3].…”

Section: Introductionmentioning

confidence: 99%