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Titolo: Discrete structures in fusion-barrier distributions for vibrational nuclei
Autore: Abul-Magd, AY; Simbel, MH;
- Indirizzi:
- Zagazig Univ, Fac Sci, Zagazig, Egypt Zagazig Univ Zagazig EgyptZagazig Univ, Fac Sci, Zagazig, Egypt
- Titolo Testata:
- EUROPEAN PHYSICAL JOURNAL A
fascicolo: 1,
volume: 10,
anno: 2001,
pagine: 57 - 67
- SICI:
- 1434-6001(200101)10:1<57:DSIFDF>2.0.ZU;2-4
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- HEAVY-ION FUSION; COUPLED-CHANNEL CODE; CROSS-SECTIONS; ELASTIC-SCATTERING; S-32+NI-58,NI-64 SYSTEMS; SUBBARRIER ENERGIES; COULOMB BARRIER; FISSION;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 45
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Abul-Magd, AY Zagazig Univ, Fac Sci, Zagazig, Egypt Zagazig Univ ZagazigEgypt Univ, Fac Sci, Zagazig, Egypt
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- Citazione:
- A.Y. Abul-Magd e M.H. Simbel, "Discrete structures in fusion-barrier distributions for vibrational nuclei", EUR PHY J A, 10(1), 2001, pp. 57-67
Abstract
We obtain a closed-form expression for the distribution of fusion barriersfor vibrational nuclei using a generalization of Dasso, Landowne, and Winther's model, which represents the nuclear surface vibrations as a number ofharmonic oscillators, and allows the excitation of an arbitrary number of phonons in the target and/or projectile. We find that this expression is inreasonable agreement with the average trends of the empirical distributions for the fusion of O-16 with Zr-92, Sm-144 and Pb-208, but fails to reproduce the double peaking of the distribution for the Sm-144 target. Only whenwe restrict the number of excited phonons to a limited number, we are ableto reproduce such discrete structures. We show that limiting the number ofcoupled channels, particularly in the case of strong coupling, increases the spacings between the channel eigenvalues that determine the positions ofthe peaks of the barrier distribution and modifies their heights.
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Documento generato il 23/05/13 alle ore 14:44:19