Angular Momentum Transfer in Incomplete-Fusion Reactions

Geoffroy, K.; Sarantites, D. G.; Halbert, M.L.; Hensley, D. C.; Dayras, R.; Barker, J. H.

doi:10.1103/physrevlett.43.1303

Cited by 100 publications

(32 citation statements)

References 9 publications

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“…Some early e orts were made along this line 15,17] but the reactions involved beams and energies that would be of little interest to spectroscopists. It would also be interesting to investigate reactions involving other weakly bound stable beams, such as 9 Be and 11 B.…”

Section: Discussionmentioning

confidence: 99%

Population of nuclei via Li7 -induced binary reactions

et al. 2005

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We have investigated the population of nuclei formed in binary reactions involving 7 Li beams on targets of 160 Gd and 184 W. The 7 Li+ 184 W data were taken in the rst experiment using the LIBERACE Ge{array in combination with the STARS Si E{E telescope system at the 88{Inch Cyclotron of the Lawrence Berkeley National Laboratory. By using the Wilczy nski binary transfer model, in combination with a standard evaporation model, we are able to reproduce the experimental results. This is a useful method for predicting the population of neutron{rich heavy nuclei formed in binary reactions involving beams of weakly bound nuclei and will be of use in future spectroscopic studies.PACS numbers: 25.70.Hi Typeset using REVT E X 1

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Section: Discussionmentioning

confidence: 99%

Population of nuclei via Li7 -induced binary reactions

et al. 2005

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“…Wilczynski et al [17], established ICF as a natural extension of CF for higher ℓ-values (above ℓ crit ) associated with peripheral interactions. The non-central nature of ICF has also been emphasized by Geoffroy et al [18], Trautmann et al [19], and Inamura et al [20]. In the most widely used breakup fusion (BF) -model [21] of Udagawa and Tamura, the projectile is assumed to break-up into constituent α-clusters (e.g., 16 O may break-up into 12 C+α and/or 8 Be+ 8 Be) within the nuclear field of the target nucleus.…”

Section: Introductionmentioning

confidence: 87%

Observation of incomplete fusion reactions at l < l crit

Yadav¹,

Sharma²,

Singh³

et al. 2014

AIP Conference Proceedings

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Abstract:In order to understand the presence of incomplete fusion at low energies i.e. 4-7MeV/nucleon & also to study its dependence on various entrance-channel parameters, the two type of measurements (i) excitation function for 12 C+ 159 Tb, and (ii) forward recoil ranges for 12 C+ 159 Tb systems have been performed. The experimentally measured excitation functions have been analyzed within the framework of compound nucleus decay using statistical model code PACE4. Analysis of data suggests the production of xn/pxn-channels via complete fusion, as these are found to be well reproduced by PACE4 predictions, while, a significant enhancement in the excitation functions of α-emitting channels has been observed over the theoretical ones, which has been attributed due to the incomplete fusion processes. Further, the incomplete fusion events observed in case of forward recoil range measurements have been explained on the basis of the breakup fusion model, where these events may be attributed to the fusion of 8 Be and/or 4 He from 12 C projectile to the target nucleus. In the present work, the SUMRULE model calculations are found to highly underestimate the observed incomplete fusion cross-sections which indicate that the ℓ-values lower than ℓ crit (limit of complete fusion) significantly contribute to the incomplete fusion reactions.

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“…induced reactions on heavy nuclei was performed to investigate CF-ICF using particle-gamma coincidence techniques and recoil range distribution techniques [11][12][13][14][15][20][21][22][23]. It is observed that the articles [18][19][20][21] are consistent with the sum rule model [24] and [13][14][15]23] with the breakup fusion model [25] [18,19,[26][27][28]. The dependence of the localization of the entrance channel angular momentum (l) window on deformation of target nucleus was well described in the review of Gerschel et al [29].…”

Section: Introductionmentioning

confidence: 99%

Li7 -induced reaction on Monat : A study of complete versus incomplete fusion

2017

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Background: Several investigations on the complete-incomplete fusion (CF-ICF) dynamics of α-cluster well-bound nuclei has been contemplated above the Coulomb barrier (∼ 4-7 MeV/nucleon) in recent years. It is therefore expected to observe significant ICF over CF in the reactions induced by a weakly bound α-cluster nucleus at slightly above the barrier.Purpose: Study of the CF-ICF dynamics by measuring the populated residues in the weakly bound 7 Li+ nat Mo system at energies slightly above the Coulomb barrier to well above it.Method: In order to investigate CF-ICF in the loosely bound system, 7 Li beam was bombarded on the nat Mo foils, separated by the aluminium (Al) catcher foils alternatively, within ∼ 3-6.5MeV/nucleon. Evaporation residues produced in each foil were identified by the off-line γ-ray spectrometry. Measured cross section data of the residues were compared with the theoretical model calculations based on the equilibrium (EQ) and preequilibrium (PEQ) reaction mechanisms. Results:The experimental cross section of 101m,100,99m,97 Rh, 97,95 Ru, 99m,96,95,94,93m+g Tc and 93m Mo residues measured at various projectile energies were satisfactorily reproduced by the simplified coupled channel approach in comparison to single barrier penetration model calculation.Significant cross section enhancement in the α-emitting channels was observed compared to EQ and PEQ model calculations throughout observed energy region. The ICF process over CF was analyzed by comparing with EMPIRE. The increment of the incomplete fusion fraction was observed with increasing projectile energies. Conclusions:Theoretical model calculations reveal that compound reaction mechanism is the major contributor to the production of residues in 7 Li+ nat Mo reaction. Theoretical evaluations substantiate the contribution of ICF over the CF in α-emitting channels. EMPIRE estimations shed light on its predictive capability of cross sections of the residues from the heavy-ion induced reactions.

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Angular Momentum Transfer in Incomplete-Fusion Reactions

Cited by 100 publications

References 9 publications

Population of nuclei via Li7 -induced binary reactions

Population of nuclei via Li7 -induced binary reactions

Observation of incomplete fusion reactions at l < l crit

Li7 -induced reaction on Monat : A study of complete versus incomplete fusion

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