Elastic scattering of 24.7 MeV alpha particles

Budzanowski, A.; Grotowski, K.; Micek, S.; Niewodnicźański, H.; Śliz̊, J.; Strzalkowski, A.; Wojciechowski, H.

doi:10.1016/0031-9163(64)90265-3

Cited by 28 publications

(19 citation statements)

References 10 publications

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“…The calculated results are in good agreement with the experimental data. Figure 21 shows the comparison of the calculated results of differential cross sections relative to Rutherford cross sections for 209 Bi at incident 4 He energies from 19 to 104 MeV with the experimental data [30,33,53]. The calculated results are in good agreement with experimental data.…”

Section: Calculated Results and Analysissupporting

confidence: 82%

“…15. It is shown that for the angle less than 50 • , the calculated results are in good agreement with the experimental data, while for the larger angle, there are a few The calculated results of differential cross sections relative to Rutherford cross sections for 107 Ag at incident 4 He energies from 15.0 to 43.0 MeV are compared with the experimental data [35,[52][53][54][55] in Fig. 17.…”

Section: Calculated Results and Analysissupporting

confidence: 57%

“…Calculated elastic scattering angular distributions in the Rutherford ratio (solid line) at different incident4 He energies compared with experimental data (symbols)[35,[52][53][54][55] for 4 He + 107 Ag reaction. The results are divided by 10 0 , 10 1 , 10 2 , .…”

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confidence: 99%

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He4microscopic optical model potential

Guo

Liang

et al. 2011

Phys. Rev. C

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The 4 He microscopic optical model potential is obtained by Green's function method through nuclear matter approximation and local density approximation based on the effective Skyrme interaction. The microscopic optical model potential is analyzed and utilized to calculate the reaction cross sections and elastic scattering angular distributions for the target nuclei in the mass range 12 A 209 with incident 4 He energy up to 400 MeV. The theoretical results are compared with the experimental data.

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Section: Calculated Results and Analysissupporting

confidence: 82%

Section: Calculated Results and Analysissupporting

confidence: 57%

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He4microscopic optical model potential

Guo

Liang

et al. 2011

Phys. Rev. C

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“…These elastic yields at forward angles were normalized to the corresponding data from Ref. [10]and in this way, the absolute normalization constants were determined.…”

Section: P Bhattacharyyamentioning

confidence: 99%

Can weakly absorbing surface transparent nucleus-nucleus interaction ensure orbiting?

et al. 1995

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We find that in contrast to the large orbiting yield seen in Si+' C, Mg+ 0, Mg+ C, and Ne+' C reactions, the back-angle, strongly damped binary yields from He+ Al and He+ Ca reactions are in agreement with the predictions of statistical compound nuclear reaction. These results disagree with the observation from heavy-ion reaction systematics that the orbiting yield will dominate whenever the number of open channels is small, and suggest that the weak absorption and surface transparency of nucleus-nucleus interaction are not sufficient conditions for the dominance of orbiting in back-angle, strongly damped reaction. PACS number(s): 25.70. -z, 24. 10. -i, 24.30. -v, 24.60. -kWe know from studies [1 -4] of fully energy-damped binary yields produced in light heavy-ion reactions at energies around 4 -8 MeV/nucleon that in certain systems a deepinelastic orbiting mechanism dominates binary yields and in others fusion-fission process dominates binary yields. In the case of fusion-fission process, such as Cl+ ' C, Na+ Mg, and P+ 0, an equilibrated compound nucleus [1 -3] is formed and it has a certain probability of decaying into entrance channel depending on available phase-space and barrier penetration probabilities. In the case of orbiting reactions such as Si+ C, Mg+' 0, etc. , the two nuclei form a dinuclear orbiting complex [4,5] where they maintain their separate identities and have a large probability (4 -5 times larger than the predictions of the statistical compound nucleus model) of breaking into the entrance channel. Both orbiting and fusion-fission process have long lifetime and as a result characteristic 1/sin0, angular distribution in the center-of-mass frame is observed. However, orbiting is characterized by large binary damped yield [4] (4 -5 times larger than expected from compound nuclear reaction), entrance channel dependence [5] and its characteristic y-ray angular correlation [6].In order to obtain a better understanding of the orbiting reaction mechanism, it is important to understand the basic criteria which determine whether orbiting or fusion-fission mechanism will dominate the binary yield of breaking apart into the entrance channel. Recently, Beck et al. [7] made an observation from the heavy-ion reaction systematics that the orbiting mechanism dominates back-angle binary yield when the number of open channels for the system is small and the fusion-fission mechanism dominates when the number of open channels for the system is large. Beck et aI. 's observation is in agreement with the dominance of orbiting in Si+ C Mg+ 60 4Mg+ & C and Ne+ C reacti and that of fusion-fission in P+' 0, Cl+' C, and Na+ Mg reactions. The number of open channels is a qualitative measure of absorption of partial waves by the nuclear potential due to the direct reaction processes. So Beck et al. 's observation implies that the orbiting yield is dominant in the case of the surface transparent weakly absorbing nucleus-nucleus interaction. On the other hand, strongly absorbing nucleus-nucleus interaction suppresses or...

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“…The calculated result of the elastic scattering angular distribution for the heavy nucleus 209 Bi is also compared with the experimental data [17][18][19] in Fig. 10.…”

Section: Resultsmentioning

confidence: 99%

Global phenomenological and microscopic optical model potentials for alpha

Guo

Liang

et al. 2017

EPJ Web Conf.

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Abstract. The global phenomenological and microscopic optical model potentials for alpha with the incident energy up to 400 MeV are obtained. The global phenomenological optical model potential is extracted by simultaneously fitting the experimental data of total reaction cross sections and elastic scattering angular distributions in the mass range of target nuclei 20 ≤ A ≤ 209. The microscopic optical model potential is obtained by the Green function method through nuclear matter approximation and local density approximation based on the effective Skyrme nucleon-nucleon interaction. Both optical model potentials are used to calculate the reaction cross sections and elastic scattering angular distributions for the target nuclei in the mass range 12 ≤ A ≤ 209 at incident alpha energies up to 400 MeV. The calculated results are compared with the experimental data, and the calculated results by phenomenological and microscopic optical model potentials are also compared with each other.

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Elastic scattering of 24.7 MeV alpha particles

Cited by 28 publications

References 10 publications

He4microscopic optical model potential

He4microscopic optical model potential

Can weakly absorbing surface transparent nucleus-nucleus interaction ensure orbiting?

Global phenomenological and microscopic optical model potentials for alpha

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