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Ledoux, R. J.; Bechara, Mireille; Ordoñez, C.E.; Cosman, E.R.

doi:10.1103/physrevc.27.1103

Cited by 27 publications

(46 citation statements)

References 34 publications

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“…This structure in the excitation functions, which could also be observed in other systems such as 12 Consequently, a large body of data over a wide energy range has been accumulated for the 12 C+ 12 C system from the systematic studies of this reaction [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the12C+12Creaction using a new type of coupling potential

Boztosun

Rae

2001

Phys. Rev. C

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A new approach has been used to explain the experimental data for the 12 C+ 12 C system over a wide energy range in the laboratory system from 32.0 MeV to 126.7 MeV. This new coupled-channels based approach involves replacing the usual first derivative coupling potential by a new, secondderivative coupling potential. This paper first shows and discusses the limitation of the standard coupled-channels theory in the case where one of the nuclei in the reaction is strongly deformed. Then, this new approach is shown to improve consistently the agreement with the experimental data: the elastic scattering, single-2 + and mutual-2 + excitation inelastic scattering data as well as their 90 • elastic and inelastic excitation functions with little energydependent potentials. This new approach makes major improvement on all the previous coupled-channels calculations for this system.

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Section: Introductionmentioning

confidence: 99%

Analysis of the12C+12Creaction using a new type of coupling potential

Boztosun

Rae

2001

Phys. Rev. C

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“…Of course, there are many possible molecular bands for lower spins, to be observed around the Coulomb barrier region. We have obtained many molecular excited states for the same spin, the number of which are comparable with the [6]. This spin assignment is very important, because spins of all three resonances are suggested to be J = 12 by Cormier [1].…”

Section: Molecular Spectrum and Excitation Functionsmentioning

confidence: 79%

A novel visage of molecular resonances in¹²C +¹²C

Uegaki

Abe

2017

J. Phys.: Conf. Ser.

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Abstract. Resonances observed in the 12 C + 12 C collisions are studied by the molecular model. Firstly, normal-modes analysis made around the equilibrium equator-equator touching configuration gives a basic insight into dynamics of the system. The quantum numbers of the states also indicate rotational motions of the constituent 12 C nuclei, which relate the normal modes to the corresponding inelastic 12 C + 12 C channels. Next, low-lying 11 states are taken up as bases, and Coriolis coupling has been diagonalized. Many excited states are obtained with intermediate widths, which is just in accord with the experimental observation. For example, the second and third excited states have characteristic feature as low-lying mutual 2 + excitation with the spin vectors of 12 C nuclei along the molecular z ′ -axis. Those states appear very close to the molecular ground state with the higher spin of ∆J = 2, to form a bunch. Resultant excitation functions are surprisingly in good agreement with the experiments, which lights up a new physical picture of molecular structures of the high-spin 12 C + 12 C resonances. IntroductionWell above the Coulomb barrier of the 12 C + 12 C system, series of resonances have been found with high spins over 10h, which exhibit prominent peaks in the elastic and inelastic 2 + channels [1]. Band Crossing Model (BCM), based on the double resonance mechanism, has successfully explained resonance mechanism with the aligned configurations of the orbital angular momentum and the spins of the excited states of 12 C nuclei [2]. We have revisited the resonances with the new molecular model [3,4], which has been developed for the analyses of the high-spin resonances observed in 24 Mg + 24 Mg and 28 Si + 28 Si. The model has an advantage to describe various geometrical configurations of two constituent deformed nuclei with the method of normal modes around the stable energy minimum under strong nucleus-nucleus interaction, which gives intuitive understanding on nuclear structure of the resonances. For the oblate-oblate systems such as 28 Si − 28 Si and 12 C − 12 C, the stable configurations have a small axial asymmetry as a whole and thus exhibit a series of low-lying excited states with K = 2 or 4, in which spins of the constituent nuclei incline to the molecular z ′ -axis. Those states naturally have an interesting property of spin disalignments with the orbital angular momentum, which is contrary to the alignments in BCM. How to resolve an apparent contradiction?In rotating systems, Coriolis coupling plays an important role in optimization of the centrifugal energy. Actually, a diagonalization of the coupling has resulted in an admixture of the K = 1 configuration in the molecular ground state and thus the state has aligned components similar to those of BCM [5]. Furthermore, interesting is that the K = 2 and K = 4 states are expected to be also observed through a weak coupling to the elastic channel caused by chains

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“…For highly-excited resonant states, other configurations with excited cluster and/or excited core would exist, which decreases the preformation factor of the interested channel, and consequently reduces the corresponding decay width. For the resonant states in the energy range of ≈ 23 − 34 MeV, however, all the experiments [15][16][17][18][19][20][21][22][23][24][25][26] We can further analyze the effect on the width from other possible channels. The Therefore, for width calculations in the energy range studied, contributions from excited channels should be negligible.…”

Section: Calculations and Discussionmentioning

confidence: 99%

“…Already as early as 1960 resonant states observed in the 12 C+ 12 C elastic scattering reaction were found to correspond to quasimolecular structures in the compound nucleus 24 Mg [11,12]. Thenceforth, many reaction experiments were performed where different cluster-decay channels were observed, i.e., α+ 20 Ne * [13,14] [19,[21][22][23][24][25][26]. Also α-chain structures have been suggested [27].…”

Section: Introductionmentioning

confidence: 99%

Molecular structure of highly excited resonant states inMg24and the correspondingBe8
Chen
¹
,
Qi
²
,
Liotta
³

et al. 2010
Phys. Rev. C
11
0
11
0
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Exotic 8 Be and 12 C decays from high-lying resonances in 24 Mg are analyzed in terms of a cluster model. The calculated quantities agree well with the corresponding experimental data. It is found that the calculated decay widths are very sensitive to the angular momentum carried by the outgoing cluster. It is shown that this property makes cluster decay a powerful tool to determine the spin as well as the molecular structures of the resonances.

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C12+C

Cited by 27 publications

References 34 publications

Analysis of the12C+12Creaction using a new type of coupling potential

Analysis of the12C+12Creaction using a new type of coupling potential

A novel visage of molecular resonances in¹²C +¹²C

Molecular structure of highly excited resonant states inMg24and the correspondingBe8
Chen
¹
,
Qi
²
,
Liotta
³

et al. 2010
Phys. Rev. C
11
0
11
0
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C12+C

Cited by 27 publications

References 34 publications

Analysis of the12C+12Creaction using a new type of coupling potential

Analysis of the12C+12Creaction using a new type of coupling potential

A novel visage of molecular resonances in12C +12C

Molecular structure of highly excited resonant states inMg24and the correspondingBe8Chen1, Qi2, Liotta3 et al. 2010Phys. Rev. C110110View full textAdd to dashboardCite

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A novel visage of molecular resonances in¹²C +¹²C

Molecular structure of highly excited resonant states inMg24and the correspondingBe8
Chen
¹
,
Qi
²
,
Liotta
³

et al. 2010
Phys. Rev. C
11
0
11
0
View full text Add to dashboard Cite