Elastische streuung schwerer ionen

Gobbi, A.; Matter, U.; Perrenoud, Jean-Luc; Marmier, P.

doi:10.1016/0375-9474(68)90077-8

Cited by 59 publications

(8 citation statements)

References 18 publications

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“…Extensive studies of elastic scattering of heavy ions on light nuclei [1][2][3][4][5][6] have shown that interesting information can be deduced from the data whenever strong deviations from an average behaviour, which is described by strong absorption, can be observed. These deviations are mainly observed at large angles, or at medium angles at higher incident energies, i.e.…”

Section: Introductionmentioning

confidence: 99%

Calculation on the nuclear breathing modes

Jakubassa

1973

Z. Physik

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Angular distributions of the elastic scattering in the range of 30-160 ~ OCM have been measured for the systems 15N+ 19F, 19F+ 160 and 19F+ 1sO at three energies, the highest being approximately 4 MeV above the Coulomb barrier. The large differences observed in the structure of the angular distributions at large angles are discussed considering elastic transfer, and the angular momentum balance for the possible direct surface reactions. The analysis yields a consistent description of the data in terms of elastic transfer.

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Section: Introductionmentioning

confidence: 99%

Calculation on the nuclear breathing modes

Jakubassa

1973

Z. Physik

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“…Previously, such resonances had been found in the systems 12 C + 12 C 1,2 and i2 C+ i6 0 3.4, 5 but had been considered nonexistent in 12 C + 13 C. 6 ' 7 In the present paper, we report the observation of resonances in the system 12 C+ 13 C. To reexamine the system 12 C + 13 C, we measured the excitation function of the reaction 12 C( 13 C, a) 21 Ne at a lab angle of 10° over a range of lab bombarding energies, £( 13 C) = 12 to 22.5 MeV, in 100-keV steps. Elastic scattering was measured at eight lab angles over the same energy range.…”

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confidence: 96%

Resonances inC12+C
Crozier
¹
,
Legg
²

1974
Phys. Rev. Lett.
27
0
2
0
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1213 14 15 16 17 LAB ENERGY (MeV)Resonant structures at 9.4 and 10.3 MeV cm. energy have been observed in both the reaction 12 C( 13 C,«) 21 Ne and the elastic scattering of 13 C from 12 C. Unambiguous assignments ofl~7 for both of the resonances are made.Considerable effort has been devoted to the search for resonances in heavy-ion systems. Previously, such resonances had been found in the systems 12 C + 12 C 1,2 and i2 C+ i6 0 3.4, 5 but had been considered nonexistent in 12 C + 13 C. 6 ' 7 In the present paper, we report the observation of resonances in the system 12 C+ 13 C. To reexamine the system 12 C + 13 C, we measured the excitation function of the reaction 12 C( 13 C, a) 21 Ne at a lab angle of 10° over a range of lab bombarding energies, £( 13 C) = 12 to 22.5 MeV, in 100-keV steps. Elastic scattering was measured at eight lab angles over the same energy range. As a result two definite resonances were observed to be correlated in the two exit channels.The excitation function for the reaction 12 C( 13 C, a) 21 Ne at a lab angle of 10° is shown in Fig. 1(a); the yield has been summed over the lowest thirteen levels in 21 Ne. Statistical fluctuations in summed excitation functions are expected to be damped by a factor which is greater than or equal to the number of levels (13). 8 * 9 From examination of Fig. 1(a) it can be seen that variations in the yield considerably in excess of those allowed by the statistical model do occur. Most of the energy range has been measured at least twice with good reproducibility. Prominent structures in the summed a yield are observed near the lab energies £^ = 15, 16.2, 17.3, 19.5, and 21.5 MeV (£ , c#m . = 7.2, 7.8, 8.3, 9.4,and 10.3 MeV, respectively). Less prominent structures are observed near £ lab = 20.3 (£ c>m . =9.7 MeV).In order to investigate whether the observed structure in the 12 C( 13 C, a) 21 Ne excitation curves might be due to resonances, we examined a different exit channel, the elastic scattering. The elastic scattering excitation functions for three cm. angles-73.4, 89.6, and 100.5°-are shown in Fig. 1(b). Resonances at .F lab =19.5 and 21.5 MeV can be plainly seen.In order to determine the I values of these resonances, the background elastic scattering was fitted by using the elastic-transfer theory of von 15 16 17 18 19 20 ZT LAB ENERGY (MeV) FIG. 1. (a) Excitation function for the reaction l2 C( 13 C,a) 21 Ne a t 0lab =1 O o . Different symbols represent data taken on different days with different targets. The solid curve is intended to "guide the eye" only. (b) Excitation functions for the elastic scattering of 13 C from 12 C at three cm. angles. The solid curves are optical-model calculations of the background cross section as described in the text. No resonances were considered in these calculations.782

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“…On the other hand, the mechanism of elastic transfer is used to explain oscillations at large angles. 3,4 We have measured the angular distribution of 14 N on 12 C for E kb = 22.5 MeV at the Erlangen tandem accelerator. This distribution exhibits remarkable structure at large angles.…”

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confidence: 99%

“…Gobbi et al, 4 and Barker 10 have calculated angular distributions of 12 C on 13 C and 14 N on 12 C, respectively, by adding coherently a contribution of the elastic transfer reactions 13 C( 12 C, 13 C) 12 C and 12 C( 14 N, 12 C) 14 N, respectively, to the elastic potential scattering. This method suggests that oscillations at large angles are created only by the elastic transfer reaction.…”

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Modified-Mcintyre-Model Analysis of Heavy-Ion Elastic Scattering at Medium Energies

et al. 1969

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The Aj function of the Mclntyre model was modified to fit the measured differential cross section of the elastic scattering 14 N on 12 C at £ kb = 22.5 MeV, which shows extensive structure for large cm.-system angles. The modified Aj function is a Woods-Saxon type function with a sharp drop for a certain I value. This drop simulates a great number of surface reactions, which diminish the elastic channel in the case of grazing collision.

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Elastische streuung schwerer ionen

Cited by 59 publications

References 18 publications

Calculation on the nuclear breathing modes

Calculation on the nuclear breathing modes

Resonances inC12+C
Crozier
¹
,
Legg
²

1974
Phys. Rev. Lett.
27
0
2
0
View full text Add to dashboard Cite

Modified-Mcintyre-Model Analysis of Heavy-Ion Elastic Scattering at Medium Energies

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Elastische streuung schwerer ionen

Cited by 59 publications

References 18 publications

Calculation on the nuclear breathing modes

Calculation on the nuclear breathing modes

Resonances inC12+CCrozier1, Legg2 1974Phys. Rev. Lett.27020View full textAdd to dashboardCite

Modified-Mcintyre-Model Analysis of Heavy-Ion Elastic Scattering at Medium Energies

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Product

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Resonances inC12+C
Crozier
¹
,
Legg
²

1974
Phys. Rev. Lett.
27
0
2
0
View full text Add to dashboard Cite