THE TRANSITION PROBABILITIES OF 126-136 Ce ,132-138 Nd ve 134-140 Sm ISOTOPES IN THE RARE-EARTH REGION

Öz

B(E2) transition probabilities for ^126-136 Ce , ^132-138 Nd and ^134-140 Sm isotopes in the rare-earth region are calculated within Interaction Boson Model-2 (IBM-2) in which neutron and proton bosons are considered explicitly by NPBOS. These calculated values for B(E2) transition probabilities are compared with experimental ones. It is seen that calculated B(E2) transition probabilities are good agreement with the experimental ones.

Anahtar Kelimeler

• Ce,Nd ve Sm isotopes,IBM-2,B(E2) transition probabilities

NADİR TOPRAK ELEMENTLERİ BÖLGESİNDE 126-136 Ce ,132-138 Nd ve 134-140 Sm İZOTOPLARININ B(E2) GEÇİŞ OLASILIKLARI

Öz

Nadir toprak elementleri bölgesinde bulunan ^126-136 Ce , ^132-138 Nd ve ^134-140 Sm izotoplarının B(E2) geçiş olasılıkları, nötron ve proton bozonlarının farklı olarak ele alındığı Etkileşen Bozon Modeli–2 (IBM-2) çerçevesinde, NPBOS programı kullanılarak hesaplandı. Hesaplanan değerler deneysel verilerle karşılaştırıldı. Hesaplanan B(E2) geçiş olasılıklarının deneysel verilerle oldukça uyumlu sonuçlar verdiği görüldü.

Anahtar Kelimeler

• Ce,Nd ve Sm izotopları,IBM-2,B(E2) geçiş olasılıkları

Kaynakça

1. [1] A. Arima and F. Iachello, “Collective nuclear states as representations of a SU(6) group”, Phys. Rev. Lett. 35, 1069 (1975).
2. [2] F. Iachello and A. Arima, “Boson symetries in vibrational nuclei”, Phys. Rev. Lett. B 53, 309 (1974).
3. [3] J. P. Elliot, “Collective motion in the nuclear shell model. I. Classification schemes for states of mixed configurations”, Proc. R. Soc. London, Ser. A 245, 128 (1958).
4. [4] J. P. Elliot, “Collective motion in then nuclear shell model. II. The introduction of intrinsic wavefunctions”, Proc. R. Soc. London, Ser. A 245, 562 (1958).
5. [5] A. Arima and F. Iachello, “Interacting boson model of collective states I. The vibrational limit”, Ann. Phys. 99, 253 (1976).
6. [6] P. O. Lipas, “International Review of Nuclear Physics”, World Scientific, Singapure, 175 (1984).
7. [7] O. Scholten, Ph. D Thesis, Kernfisich Versneller Instituut, Groningen (1980).
8. [8] I. Talmi, “Progress in Particle and Nuclear Physics”, Pergamon, Oxford, 27 (1983) .

9. [9] A. De Shalit and H. Feshbach, “Theoretical Nuclear Physics”, Wiley, New York, (1974).
10. [10] A. Bohr and B. R. Mottelson, “The original papers on the unified model”, K. Dan. Vidensk. Selsk. Mat. Fys. Medd. 27, 16 (1953).
11. [11] G. Scharf-Goldhaber and C. Weneser, “System of even-even nuclei”, Phys. Rev. 98, 212 (1955).
12. [12] L. Wilets and M. Jean, “Surface oscillations in even-even nuclei”, Phys. Rev. 102, 788 (1956).
13. [13] A. Arima et al., “System of Even-Even Nuclei”, Phys. Rev. 98, 212 (1977).
14. [14] T. Otsuka et al., “Interacting boson model of collective nuclear states III. The transition from SU(5) to SU(3)”, Ann. Phys. 115, 325 (1978).
15. [15] F. Iachello and O. Scholten, “Interacting Boson-Fermion Model of Collective States in Odd- A Nuclei”, Phys. Rev. Lett. 43, 679 (1979).
16. [16] P. van Isacker et al., “Extension of Supersymmetry in Nuclear Structure”, Phys. Rev. Lett. 54, 653 (1985).
17. [17] M. Müller-Veggian, H. Béuscher, D. R. Haenni, R. M. Lieder, and A. Neskakis, “Study of the level structure in 134Ce”, Nucl. Phys. A 417, 189 (1984).
18. [18] T. W. Burrows, “Nuclear data sheets for A = 136”, Nucl. Data Sheets 52, 273 (1987).
19. [19] J. Deslauriers, S. C. Gujrathi, and S. K. Mark, “Structure of even-even138Nd from the decay of 138Pm“, Z. Phys. A 303, 151 (1981).
20. [20] K. S. Vierinen, J. M. Nitschke, P. A. Wilmart, R. B. Frestone and J. Gilat, “Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line”, Nucl Phys. A 499, 1 (1989).
21. [21] A. Charvet, T. Ollivier, R. Béraud, R. Duffait, A. Emsallem, N. Idrissi, J. Genevey and A. Gizon, “Identification and decay of 12s 138Eu”, Z. Phys. A 321, 697 (1985).
22. [22] N. Redon, T. Ollivier, R. Béraud, A. Charvet, R. Duffait, A. Emsallem, J. Honkanen, M. Meyer, J. Genevey, A. Gizon and N. Idrissi, “New exotic neutron-deficient nuclei nearN=82”, Z. Phys. A 325,127 (1986).
23. [23] R. Moscrop, M. Campbell, W. Gelletly, L. Goetting, C. J. Lister, B. J. Varley and H. G. Price, “Deformation of 126Ce”, Nucl. Phys. A481, 559 (1988).
24. [24] S. Raman, C. H. Malarkey, W. T. Milner, C. W. Nestor and P. H. Stelson, “Transition probability, B(E2)↑, from the ground to the first-excited 2+ state of even-even nuclides”, At. Data Nucl. Data Tables 36, 1 (1987).
25. [25] A. J. Kirwan et al., “Lifetime measurements in the yrast band of 132Ce”, J. Phys. G 15, 85 (1989).
26. [26] A. Makishima, M. Adachi, H. Taketani and M. Ishii, “Yrast bands in 136,138Sm and Nd”, Phys. Rev. C 34, 576 (1986).
27. [27] R. Wadsworth et al., “Lifetimes of low-lying levels in light rare earth nuclei around A=135”, J. Phys. G 13, 205 (1987).
28. [28] J. Billowes et al., “Lifetime and g-factor measurements of yrast states in 134Nd and 136Nd”, Phys. Rev. C 36, 974 (1987).
29. [29] F. Soramel et al., “Nucleus 136Sm and the transition to a deformed regime at N=76–74”, Phys. Rev. C 38, 537 (1988).
30. [30] M. O. Kortelahti et al., “Transitional nuclei in the rare-earth region: Energy levels and structure of 130,132Ce, 132,134 Nd and 134Pm, via β decay of 130,132Pr, 132,134Pm, and 134Sm”, Phys. Rev. C 42, 1267 (1990).
31. [31] M. Özer, “Nadir Toprak Elementleri Bölgesinde Geçiş Çekirdeklerinin Nükleer Özellikleri“, Yüksek Lisans Tezi, Dumlupınar Üniversitesi Fen Bilimleri Enstitüsü (2004).