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Fletcher, N.R.; Fox, J. D.; Kekelis, G.; Morgan, G.R.; Norton, G.A.

doi:10.1103/physrevc.13.1173

Cited by 65 publications

(14 citation statements)

References 17 publications

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“…These results together with those obtained on the same reaction at lower energies by other authors [14][15][16][17] are summarized on the E c:m: vs. JJ + 1 plane of fig. 5 and show a fair consistency with the linear rule typical of rotational bands.…”

Section: -Experiments and Data Analysissupporting

confidence: 68%

Resonances in the12C(12C,8Beg.s.)16O reaction and rotational states in24Mg

et al. 1997

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The results of a set of experiments on the 12 C + 12 C ! 8 Beg:s: + 16 O excitation function between 20 and 36 MeV c.m. beam energy are summarized and discussed. A set of 1 MeV wide resonances shows up in the energy range investigated, all of them following the rotational rule with a coefficient of inertia consistent with a , 16 O , configuration. PACS 25.70.Ef -Resonances. PACS 21.60.Gx -Cluster model.

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Section: -Experiments and Data Analysissupporting

confidence: 68%

Resonances in the12C(12C,8Beg.s.)16O reaction and rotational states in24Mg

et al. 1997

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“…This phenomenon, pointed out by Feshbach, 10 has already been ob-served in Ref. 7; the present results, however, suggest a considerably larger amount of mixing in of resonances differing by 2 units of spin. It is also obvious that other resonances of J 7r = 6 + should be expected around E c 'S MeV.…”

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confidence: 59%

Evidence for a Rotational Band inMg24and Its Fragmentation: A Rotation-Vibration Coupling?

et al. 1977

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Three resonances in 12 C + ^C withE CtW U ir ) of 8.85(6 + ) 11.2(8 + ), and 13.75(10 + ) are reported. Together with earlier data, these resonances fit in a rotational band in Mg. model based on the rotation-vibration coupling is proposed to account for these data.Several recent experiments 1 " 4 have provided new information on spins and parities of resonances in 24 Mg at high energies of exitation. In the present experiment, we investigate the reaction 12 C( 12 C,o?) 20 Ne in the range 6.85 ^£ c ,^ 15 MeV and report three resonances at£ Cema =8.85, 11.2, and 13.75 MeV to which we assign definite J 1 * values. Combining these results with the data from previously reported measurements 3 and the results of other author s, 1 ' 2 ' 4 " 9 we attempt a unified picture of the resonances in 24 Mg.The present experiment was performed using the Model FN tandem accelerator of the Centre d'Etudes Nucleaires Bruyeres le Chatel. a particles from the reaction 12 C( 12 C,o0 2O Ne were momentum analyzed in a split-pole magnetic spectrograph and detected in position-sensitive detectors. The excitation functions of four a groups leading to, respectively, the ground state and the 1.63-, 4.25-, and 4.97-MeV states in 20 Ne were measured at 10° and 20° using a 30-/ig/cm 2 carbon target. In addition, the ground-state excitation function was measured at 7.5° lab using a 50-/jtg/cm 2 target. From the correlated maxima in the excitation functions of transitions leading to naturalparity states in 20 Ne and the relative smallness of the 2" excitation function at very forward angles, energies around£ c .m. =8.85, 11.2, and 13.75 MeV were selected as likely candidates for resonances, and ground-state a angular distributions were measured on and off these energies. For a narrow, noninterfering resonance of spin J = L, the angular distribution follows the form ffli =11.2 and 13.75 MeV with the P 8 2 (eos0) and P 10 2 (cos£) shapes, respectively, is shown in Fig. 1; the agreement is quite satisfactory.The measured angular distributions were subsequently submitted to a x 2 (^max) analysis using expression (2). The values of x 2 plotted vs the maximal degree of polynomials used are shown <5(8) mb/sr \ 2 1 0.5[ 0.2j 0.l| 5| 2 I l[ 0,5 0.2| 0.1 •A ; *\ 11.2 MeV J-8* \ / Y\ f\

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“…Many narrow resonances in the 12 C + 12 C system have been observed in particular reaction channels. 5 However, the oscillations in a fus are not obviously correlated with the known structure in specific channels, with the possible exception 4 of the gross structure in the 90° elastic scattering of 12 C on 12 C. 6 The second striking feature is that the structureless excitation functions observed for ls O + 12 C and 19 F+ 12 C are characterized by a significantly higher maximum value of a fus than the other systems (see Fig. 2).…”

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confidence: 95%

Fusion Cross Sections of Light Heavy-Ion Systems: Resonances and Shell Effects

et al. 1976

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The total fusion cross sections for the systems 12 C + 12 C, 18, 0 + l2 C, and 19 F+ 12 C have been measured as a function of bombarding energy and compared with results for other light heavy-ion systems. The presence or absence of oscillations in the fusion excitation function and the overall magnitude of the cross section at high energies appear to depend on the structure of the colliding nuclei.The energy dependence of the cross section for the complete fusion of two complex nuclei has received considerable recent attention. 1 In most cases the measured excitation functions are smooth, as is consistent with macroscopic models of such processes. In a recent study of the 16 0 + 12 C system, unexpected oscillatory structure was seen in the energy dependence of the fusion cross section. 2 In the present study we have bombarded 12 C targets with several other ions, near in mass to le O, in order to establish the range of nuclei over which structure is seen in the fusion excitation function, and also to delineate the macroscopic features of the fusion process.The fusion cross sections for the systems 12 C + 12 C, 18 0+ 12 C, and 19 F+ 12 C were measured as a function of bombarding energy using beams obtained from the Argonne National Laboratory FN tandem accelerator. The experimental procedure and uncertainties have been described previously. 2 All reaction products with higher Z than the incident ions were assumed to be evaporation residues and were included in defining the fusion cross section.The fusion cross sections [o fus (E)] for the three systems studied are shown in Fig. 1 as a function of cm. energy. The solid lines in Fig. 1 are calculated using the model of Glas and Mosel 3 which is based on the assumption that fusion occurs whenever the nuclei reach a critical separation distance, R c . The parameters used to fit the data are listed in Table I. The experimental results confirm the qualitative prediction of the model that a fus for such a light system should saturate at some critical bombarding energy and then decrease or remain roughly constant at higher energies.There are two qualitative features in our exper-1.2 H -Q 0.61 1.0 0.8 0.6h 0.41

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Resonant structures in theC12(C

Cited by 65 publications

References 17 publications

Resonances in the12C(12C,8Beg.s.)16O reaction and rotational states in24Mg

Resonances in the12C(12C,8Beg.s.)16O reaction and rotational states in24Mg

Evidence for a Rotational Band inMg24and Its Fragmentation: A Rotation-Vibration Coupling?

Fusion Cross Sections of Light Heavy-Ion Systems: Resonances and Shell Effects

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