DWBA of the Reaction 0Be(p, a )6Li at EP = 18.6\sim 50 MeV

S. E. ABDEL-KARIEM

Makale detayları

DWBA of the Reaction 0Be(p, a )6Li at EP = 18.6\sim 50 MeV

Yazarlar:

S. E. ABDEL-KARIEM

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2006 Vol.30 Issue 1, pp.1-14

Belge Tipi:

Makale

Yayın Tarihi:

12/2005

Belge Dili:

Türkçe

Document ID (Org No.):

2000761417

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101

Anahtar kelimeler:

Direct mechanism; Differential Cross-sections; Spectroscopic-factor amplitudes; Dependence of the integrated cross-sections on energy.

Özet:

 

The compound nucleus produced in the reaction 9Be(p,  a)6Li in the incident energy range Ep = 18.6 \sim 50 MeV is  mainly occurred when its excitation energy is greater than the a  -particle threshold separation energy by about 20 MeV, strongly  suggesting the reaction mechanism is a direct one-step process.  To  understand this phenomenon, we employ semi-microscopic zero-range  distorted-wave Born approximation (DWBA) theory to analyse  experimental data obtained in this energy range for the lower three  6Li-states: ground state (1+; 0); 2.186 MeV (3+; 0); and 3.563 MeV  (0+; 1).  The Kurath-Millener spectroscopic-factor amplitudes for the  triton-cluster transfer are used in the analysis.  Both the  experimental angular distributions and the absolute values of the  differential cross-sections are found to have good correlation with  corresponding theoretical predictions.  Good coincidence is obtained  between the theoretically predicted spectroscopic factors SJT  (p, a) and both experimental and theoretical integrated  cross-sections (0°--90°) for Ep = 22.5, 31 and 45 MeV. Further, the  experimental integrated cross-sections for the investigated  6Li-states agree well with the corresponding theoretical values at  Ep \ge 22.5 MeV. In addition, a suitable coincidence is obtained  between the calculated and the experimental excitation energies.  The  agreement between experimental and theoretical data of this reaction  can be attributed to the use of the Cohen-Kurath wave functions and  the model of calculations.  The present study shows that, the incident  energy at which the reactions begin to proceed via the  direct-component mechanism (i.e., the critical incident energy) varies from state to another.

 

The compound nucleus produced in the reaction 9Be(p,  a)6Li in the incident energy range Ep = 18.6 \sim 50 MeV is  mainly occurred when its excitation energy is greater than the a  -particle threshold separation energy by about 20 MeV, strongly  suggesting the reaction mechanism is a direct one-step process.  To  understand this phenomenon, we employ semi-microscopic zero-range  distorted-wave Born approximation (DWBA) theory to analyse  experimental data obtained in this energy range for the lower three  6Li-states: ground state (1+; 0); 2.186 MeV (3+; 0); and 3.563 MeV  (0+; 1).  The Kurath-Millener spectroscopic-factor amplitudes for the  triton-cluster transfer are used in the analysis.  Both the  experimental angular distributions and the absolute values of the  differential cross-sections are found to have good correlation with  corresponding theoretical predictions.  Good coincidence is obtained  between the theoretically predicted spectroscopic factors SJT  (p, a) and both experimental and theoretical integrated  cross-sections (0°--90°) for Ep = 22.5, 31 and 45 MeV. Further, the  experimental integrated cross-sections for the investigated  6Li-states agree well with the corresponding theoretical values at  Ep \ge 22.5 MeV. In addition, a suitable coincidence is obtained  between the calculated and the experimental excitation energies.  The  agreement between experimental and theoretical data of this reaction  can be attributed to the use of the Cohen-Kurath wave functions and  the model of calculations.  The present study shows that, the incident  energy at which the reactions begin to proceed via the  direct-component mechanism (i.e., the critical incident energy) varies from state to another.

Makale detayları

DWBA of the Reaction 0Be(p, a )6Li at EP = 18.6\sim 50 MeV

Yazarlar: S. E. ABDEL-KARIEM

Yayıncı: TUBITAK

Dergi: Turkish Journal of Physics 2006 Vol.30 Issue 1, pp.1-14

Belge Tipi: Makale

Yayın Tarihi: 12/2005

Belge Dili: Türkçe

Document ID (Org No.): 2000761417

Sıklık: İki Aylık

eISSN: 1303-6122

pISSN: 1300-0101

Direct mechanism; Differential Cross-sections; Spectroscopic-factor amplitudes; Dependence of the integrated cross-sections on energy.

Sayı

Yazarlar:

S. E. ABDEL-KARIEM

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Physics 2006 Vol.30 Issue 1, pp.1-14

Belge Tipi:

Makale

Yayın Tarihi:

12/2005

Belge Dili:

Türkçe

Document ID (Org No.):

2000761417

Sıklık:

İki Aylık

eISSN:

1303-6122

pISSN:

1300-0101