Resonant Backward-Angle Heavy-Ion Elastic Scattering

Clover, M. R.; DeVries, R.M.; Ost, R.; Rust, N.; Cherry, R.N.; Gove, H. E.

doi:10.1103/physrevlett.40.1008

Cited by 77 publications

(6 citation statements)

References 5 publications

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“…In addition to showing a very strong orbiting-like behavior [17,61,67,90] (see Fig. 22), it also demonstrates strong resonant structures in its elastic and quasi-elastic yields [91][92][93]. Fortunately, the reaction is favorable for experimental study since intense 28 Si beams are readily available at tandem accelerator facilities and 12 C makes a very good and relatively contaminant free target.…”

Section: System-by-system Discussionmentioning

confidence: 99%

Binary decay of light nuclear systems

1999

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A review of the characteristic features found in fully energy-damped, binarydecay yields from light heavy-ion reactions with 20 ≤ A target + A projectile ≤ 80 is presented. The different aspects of these yields that have been used to support models of compound-nucleus (CN) fission and deep-inelastic dinucleus orbiting are highlighted. Cross section calculations based on the statistical phase space at different stages of the reaction are presented and compared to the experimental results. Although the statistical models are found to reproduce most of the observed experimental behaviors, an additional reaction component corresponding to a heavy-ion resonance or orbiting mechanism is also evident in certain systems. The system dependence of this second component is discussed. The extent to which the binary yields in very light systems (A CN ≤ 32) can be viewed as resulting from a fusion-fission mechanism is explored. A number of unresolved questions, such as whether the different observed behaviors reflect characteristically different reaction times, are discussed. I. INTRODUCTIONAs the interaction energy for a heavy-ion reaction increases above the Coulomb barrier, the reaction grazing angle moves to more forward angles so that, by a value of about 20% above the barrier, very small quasielastic and single-nucleon transfer reaction yields are expected at larger scattering angles. Instead, the incident flux that might be expected to scatter to larger angles, corresponding to smaller impact parameters, is trapped by the formation of a compound nucleus. For lighter systems, this compound system subsequently decays by light particle and γ-ray emission, with a very small heavy-fragment (A > 4) emission component. The experimental observation of significant large-angle, elastic-scattering cross sections at energies well above the Coulomb barrier has therefore been viewed with Calculation of fission cross sections in the statistical models is based on the Hauser-Feshbach formalism. For a compound nucleus of spin J that is populated with a partial fusion cross section of σ J , the partial fission cross section is given in terms of the ratio of the fission decay width Γ f is J to the total decay width for this spin Γ tot J , with

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Section: System-by-system Discussionmentioning

confidence: 99%

Binary decay of light nuclear systems

1999

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“…Distances between consequitive maxima in the energy dependence observed in the backangle scattering of 12 C and 1~O on 28Si versus the number of the maximum. Triangles are according to [16], circles are according to [14,15] which determines the distance between the maxima in the radar scattering. Equation (27) can always be re-written in the intriguing form…”

Section: Discussionmentioning

confidence: 99%

Diffraction at backangles

Strutinsky

1978

Z Physik A

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The backangle differential cross section is analyzed using an improved analytical approach. The differential cross section smoothed over the frequent angular oscillations is shown to be an oscillating function of the energy in the backangle region. Analogy with the radar scattering of light is pointed out. Angular and energy amplitude functions are introduced and discussed on the basis of general arguments and some simple examples.

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“…It is therefore perhaps no surprise to find that excitation functions for 160 + 28si and 12C + 28Si also give rise to resonance structure135. 136 spin se~uence is very difficult to reconcile with the Regge molecular band,137 which follows the grazing trajectory. However a calculation of shape resonances using a folding model potential leads to several rotational bands, all with moments of inertia smaller than the grazing trajectory.…”

Section: K Scottmentioning

confidence: 99%