Study of the reaction mechanism of incomplete fusion with the reactions40Ar+11B,12,13C at 7 MeV/amu

Morgenstern, H.; Bohne, W.; Galster, W.; Grabisch, K.

doi:10.1007/bf01290928

Cited by 21 publications

(34 citation statements)

References 28 publications

(18 reference statements)

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“…The results presented in section-3 clearly demonstrate the onset of ICF at the value of β ≈ 0.027 (F ICF ≈7 %) in 12 C+ 169 Tm system, and at the value of β ≈ 0.014 (F ICF ≈10 %) in 16 O+ 169 Tm system. In both cases, the observed value of F ICF is significant at well below the proposed onset β-value (i.e., 6 % of c) proposed by Morgenstern et al, [31][32][33]. A comparison of F ICF for 12 C+ 169 Tm and 16 O+ 169 Tm systems displays higher ICF probability for 16 O+ 169 Tm system for the entire measured energy range.…”

Section: Discussionmentioning

confidence: 49%

“…Following the Morgenstern's mass-asymmetry systematics [31][32][33], the values of F ICF obtained for 12 C, 16 O+ 169 Tm systems are plotted as a function of relative velocity (v rel → β) in Fig.5c. The energy axis is normalized to incorporate the Coulomb barriers of two systems, and to keep the same observable as has been used in most of the previous studies.…”

Section: Mass-asymmetry or Z P Or Projectile Structure Dependence Of Icfmentioning

confidence: 99%

“…The energy axis is normalized to incorporate the Coulomb barriers of two systems, and to keep the same observable as has been used in most of the previous studies. According to Morgenstern's systematics [31][32][33], ICF contributes significantly above β ≈0.06 (6 % speed of light). As shown in Fig.5c, the values of β are in the range from ≈0.027 (2.7 % of c) to ≈0.084 (8.4 % of c) for 12 C, and from ≈0.014 (1.4 % of c) to ≈0.053 (5.3 % of c) for 16 O.…”

Section: Mass-asymmetry or Z P Or Projectile Structure Dependence Of Icfmentioning

confidence: 99%

“…According to promptly emitted particles (PEP)-model [30], the nucleons transferred from projectile to the target nucleus may get accelerated in the nuclear field of target nucleus and consequently acquire enough extra velocity to escape before equilibration of the composite system. Further, Morgenstern et al [31][32][33], correlated the onset of ICF with relative velocity (v rel ) where ICF is found to be contributed significantly above v rel ≈0.06 (6 % of c). In an outstanding review, Gerschel [34] inferred that the localization of ℓ-window also depends on the target deformation.…”

Section: Introductionmentioning

confidence: 99%

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How does incomplete fusion show up at slightly above barrier energies?

Singh

Yadav

Sharma

et al. 2012

EPJ Web of Conferences

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Abstract.Experimental results on the onset of incomplete fusion at slightly above barrier energies are discussed in this paper. Spin-distributions of evaporation residues populated via complete and/or incomplete fusion of 12 C, 16 O (E lab ≈ 4-7 MeV) with 169 Tm have been measured to probe associated ℓ-values. Particle (Z=1,2) -γ -coincidence technique has been used for channel selection. Entirely different entry state spin populations have been observed during the de-excitation of complete and incomplete composites. The complete fusion residues are found to be strongly fed over a broad spin range. While, a narrow range feeding for only high spin states has been observed in case of incomplete fusion residues. In the present work, incomplete fusion is shown to be a promising tool to populate high spin states in final reaction products. For better insight into the onset and strength of incomplete fusion, the relative contributions of complete and incomplete fusion have been deduced from the analysis of excitation functions and forward recoil ranges. A significant fraction of ICF has been observed even at energy as low as ≈ 7% above the barrier. The relative strengths of complete and incomplete fusion deduced from the analysis of forward-recoil-ranges and excitation functions complement each other. All the available results are discussed in light of the Morgenstern's mass-asymmetry systematics. Incomplete fusion fraction is found to be large for more mass-asymmetric systems for individual projectiles, which points towards the projectile structure effect on incomplete fusion fraction. Experimentally measured forward ranges of recoils complement the existence of incomplete fusion at slightly above barrier energies, where more than one linear-momentum-transfer components associated with full-and/or partial-fusion of projectile(s) have been observed. Present results conclusively demonstrate the possibility to selectively populate high spin states via incomplete fusion.

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Section: Discussionmentioning

confidence: 49%

Section: Mass-asymmetry or Z P Or Projectile Structure Dependence Of Icfmentioning

confidence: 99%

Section: Mass-asymmetry or Z P Or Projectile Structure Dependence Of Icfmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

How does incomplete fusion show up at slightly above barrier energies?

Singh

Yadav

Sharma

et al. 2012

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…This suggests strong projectile energy dependence of ICF reactions. On the other hand, Morgenstern systematics [26,27] suggests that ICF contributes significantly above v rel ≥ 0.06 (6 % speed of light). However, in figure 3, the values of v rel are in the range from ≈ 2.7 % of c to ≈ 7.8 % of c for 12 C+ 175 Lu, and 12 C+ 169 Tm systems and from 2.3 % of c to 7.0 % of c for 13 C+ 169 Tm system.…”

Section: Icf Dependence On Incident Energymentioning

confidence: 99%

Effect of projectile on incomplete fusion reactions at low energies

et al. 2017

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Abstract. Present work deals with the experimental studies of incomplete fusion reaction dynamics at energies as low as ≈ 4 -7 MeV/A. Excitation functions populated via complete fusion and/or incomplete fusion processes in 12 C+ 175 Lu, and 13 C+ 169 Tm systems have been measured within the framework of PACE4 code. Data of excitation function measurements on comparison with different projectile-target combinations suggest the existence of ICF even at slightly above barrier energies where complete fusion (CF) is supposed to be the sole contributor, and further demonstrates strong projectile structure dependence of ICF. The incomplete fusion strength functions for 12 C+ 175 Lu, and 13 C+ 169 Tm systems are analyzed as a function of various physical parameters at a constant v rel ≈ 0.053c. It has been found that one neutron (1n) excess projectile 13 C (as compared to 12 C) results in less incomplete fusion contribution due to its relatively large negative α-Q-value, hence, α Q-value seems to be a reliable parameter to understand the ICF dynamics at low energies. In order to explore the reaction modes on the basis of their entry state spin population, the spin distribution of residues populated via CF and/or ICF in 16 O+ 159 Tb system has been done using particle-γ coincidence technique. CF-α and ICF-α channels have been identified from backward (B) and forward (F) α-gated γ spectra, respectively. Reaction dependent decay patterns have been observed in different α emitting channels. The CF channels are found to be fed over a broad spin range, however, ICF-α channels was observed only for high-spin states. Further, the existence of incomplete fusion at low bombarding energies indicates the possibility to populate high spin states.

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