Characterization of gross-structure resonances in angular-momentum-mismatched channels in heavy-ion collisions

Abstract

Gross-Structure resonances previously observed only in inclusive measurements have been studied in both single and mutual inelastic scattering involving the O2" state of ^^O. Analysis of the excitation functions in the single-excitation channel at the zeros of Legendre polynomials permits the dominant L values to be determined for most of the resonances. The measured spins disagree with the predictions of a recently published microscopic model of the inelastic-scattering process.

Spin assignments of angular momentum mismatched resonances in theO16+Barrow1, Zurmühle2, Wuosmaa3 et al. 1992Phys. Rev. C4010View full textAdd to dashboardCite

“…The energy averaged, angle-integrated excitation function from Ref. [3] for the same angle range is also plotted in Fig. l. (The excitation function of Ref.…”

“…l. (The excitation function of Ref. [3] without the energy averaging has appeared in the literature elsewhere [7]. )…”

“…Attempts were also made to explain the resonances by increasing the strength of the channel coupling [2]. Balamuth et al [3] undertook the first exclusive study of the ' 0(' 0, ' 0(02+, 6.05 MeV))' 0(g.s.) reaction channel.…”

Angular correlation, spin alignment, and systematics of mis-matched 12C+12C inelastic scattering resonances

“…= 40 • , however, the angular distributions were closely in phase with a Legendre polynomial of order 14. Furthermore, an analysis of the angular distributions of the type suggested by Balamuth et al [24] and Chapuran et al [25] at angles corresponding to zeroes of Legendre polynomials for these backward angles suggested that the backward-angle data were more consistent with l = 14 than with any other partial wave. Clearly, the results for the current resonance in the mismatched 0 + 2 + 2 + 1 channel are different from those of the more well-matched 0 + 1 + 2 + 1 , 2 + 1 + 2 + 1 , and 3 − 1 + 0 + 1 excitations.…”

“…Here, strong resonances are observed in the elastic, single and mutual inelastic 2 + 1 scattering channels. Explanations of this behavior are typically divided into two paradigms; one which invokes the nuclear structure of the compound system 24 Mg [2][3][4][5], and another where reaction mechanisms akin to potential scattering resonances are responsible for the observed structures, when the angular-momenta in entrance and exit channels are well matched [6][7][8][9]. In the latter models, the resonance spins are expected to lie close to the values of the grazing angular momentum in the 12 C + 12 C entrance channel.…”