Complete and incomplete fusion in12C+93Nb and16O+89Y reactions

Tomar, B. S.; Goswami, A.; Reddy, Α. V. R.; Das, S. K.; Burte, P. P.; Manohar, S. Β.; Prakash, Satya

doi:10.1007/bf01291827

Cited by 26 publications

(13 citation statements)

References 15 publications

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“…Since this value is higher than the mean value expected for fusion we should expect a higher M~ than experimentally found. On the other hand, some authors [10] recently also used a triangular /-window for ICF with a maximum /-value (lmax) computed as the critical value for fusion times the ratio between the fused part of the projectile and its whole mass. This gives again 58 h as /max but with a mean l =39 h. We note that this compares quite well to the mean spin of the CN after one alpha particle emission, as reported in Fig.…”

Section: Alpha Particlementioning

confidence: 99%

Gamma-ray multiplicity measurements in the28Si+64Ni reaction at 163.8 MeV

Pietro

Cardella

Musumarra

et al. 1994

Z. Physik A - Hadrons and Nuclei

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Abstract. The 28Si + 64Ni reaction at 163.8 MeV incident energy is studied by measuring in coincidence 7-rays and charged particles identified from Z=2 to Z=16. The transition from quasi-elastic to more damped reactions is observed when the difference between the detected charge and the projectile one is increased. The strong influence of the particle decay on the measured ):-ray multiplicity is evidenced with the help of the statistical model computer code CASCADE. Dissipative events are well described in the rolling limit with excitation energy equally shared between the fragments. The overall agreement is lost for the fragments with the projectile charge which show a small value of the 7-multiplicity even for dissipative events. This is probably connected with the previously observed non statistical behavior of gamma rays emitted in coincidence with projectile-like fragments. In the alpha-spectrum measured in coincidence with gamma-rays, the deexcitation of fused systems is clearly separated from in flight emission of deep inelastic fragments. The low measured gamma-ray multiplicity for fusion events is qualitatively explained taking into account the effect of alpha-emission in the statistical decay.

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Section: Alpha Particlementioning

confidence: 99%

Gamma-ray multiplicity measurements in the28Si+64Ni reaction at 163.8 MeV

Pietro

Cardella

Musumarra

et al. 1994

Z. Physik A - Hadrons and Nuclei

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“…residues (ERs) [19,31,32]. In the off-line radiochemical measurement of cross sections of evaporation residues in 16 O + 89 Y reaction by Tomar et al [32], enhancement in the cross sections of Rh (Z = 45) and Nb (Z = 41) isotopes with respect to the statistical model values was observed to be much larger compared to that in the case of other evaporation residues. Such an enhancement may be attributed to the preferential transfer of an α particle or 12 C to the target nucleus because of the favorable Q values of the transfer reactions or projectile break-up into 4 He + 12 C. However, more importantly, there may be an additional effect due to the projectile cluster structure which may enhance the cross section for transfer of 4 He or 12 C. A quantitative comparison of cross sections of PLFs or ERs from reactions induced by projectiles with and without α cluster structure can help in disentangling the effect of Q value and α cluster structure of the projectile.…”

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confidence: 94%

“…In spite of extensive studies, contribution from different reaction mechanisms to the formation of PLFs in the lower energy domain (∼5 MeV/nucleon) has remained a less explored subject. It is important to investigate the evolution of the reaction mechanism involved in the formation of PLFs which changes from purely grazing to overlapping collisions with increasing beam energy.Apart from the beam energy, projectile structure also plays an important role in the reactions involving incomplete mass transfer [30][31][32]. For projectiles with α cluster structure, cross sections for even Z PLFs have been observed to be higher than that of the neighboring odd Z PLFs [30].…”

mentioning

confidence: 95%

“…Apart from the beam energy, projectile structure also plays an important role in the reactions involving incomplete mass transfer [30][31][32]. For projectiles with α cluster structure, cross sections for even Z PLFs have been observed to be higher than that of the neighboring odd Z PLFs [30].…”

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confidence: 95%

“…Such structure effects have also been observed in the cross sections of evaporation I. Optical model parameters obtained from the fitting of elastic scattering data using the code SNOOPY 8Q [33]. residues (ERs) [19,31,32]. In the off-line radiochemical measurement of cross sections of evaporation residues in 16 O + 89 Y reaction by Tomar et al [32], enhancement in the cross sections of Rh (Z = 45) and Nb (Z = 41) isotopes with respect to the statistical model values was observed to be much larger compared to that in the case of other evaporation residues.…”

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confidence: 99%

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Quasi-elastic and massive transfer reactions in the16O+89Yreaction at beam energies around ≈4–5 MeV/nucleon

Tripathi¹,

Sodaye²,

Mahata³

et al. 2014

Phys. Rev. C

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Kinetic energy spectra, angular distributions, and cross sections of projectilelike fragments (PLFs) with Z PLF = 3−7 have been measured in 16 O + 89 Y reaction at E lab = 62. 2, 73.4, 78.5, and 83.5 MeV respectively. Comparison of angular distributions of PLFs, particularly of nitrogen (N), at different beam energies showed increasing contribution from overlapping collision trajectories at higher beam energies. Angular distributions of PLFs became more forward peaked with the amount of mass transfer indicating an increasing overlap of the projectile and the target nuclei with increasing mass transfer. PLF cross sections could be reasonably explained by the modified sum-rule model except for carbon (C) indicating the role of alpha cluster structure of 16 O nucleus in the transfer process. Large cross section for PLF emitted in the α transfer channel in 16 O + 89 Y reaction compared to that in 19 F + 89 Y reaction further supported this observation. PACS number(s): 25.70.HiReactions involving incomplete mass transfer such as quasielastic transfer (QET) and massive transfer or incomplete fusion (ICF) have been an active area of investigation for a long time. Several models such as sum-rule model [1,2], overlap model [3-6], break-up fusion model [7-9] and multi-step direct reaction theory [10] were proposed to explain these reactions. In the studies by Morgenstern et al. [11,12], the probability of incomplete fusion reaction was related to the entrance channel mass asymmetry. However, these models hold good at beam energies of about ∼10 MeV/nucleon and above. At even higher beam energies ( 15 MeV/nucleon), it has been shown that incomplete mass transfer reactions have contribution from projectile break-up and coalescence of nucleons during nucleon-nucleon interaction [13][14][15][16][17][18]. At lower beam energies (∼5 MeV/nucleon), the mechanism of incomplete mass transfer is not well understood, particularly the contribution from collision trajectories with different impact parameters as a function of beam energy. Several studies have been carried out in the recent past to investigate the reactions involving incomplete mass transfer at lower beam energies [19][20][21][22][23][24][25]. At energies very close to the entrance channel Coulomb barrier, such reactions are dominated by quasi-elastic transfer (QET) of a few nucleons [26,27]. Kinetic energy spectra of projectilelike fragments (PLFs) formed in QET peak at an optimum Q value i.e., Q opt decided by the kinematics of the reaction [28]. In QET dissipative effects are negligible. On the other hand in deep inelastic collisions (DIC), projectile and targetlike products appear at energies corresponding to the exit channel Coulomb barrier. The transition from QET to DIC represents a shift in the reaction mechanism and massive transfer or incomplete fusion reactions lie in-between these two extremes in terms of impact parameter and kinetic energy dissipation. In the studies by Mermaz et al. in 19 F + 89 Y reaction at E lab = 140 MeV [29], it was shown that the full ...

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