INFLUENCE OF SHELL STRUCTURE ON DEEP INELASTIC COLLISIONS

WU En-Chiu

Chinese Physics C> 1983, Vol. 7> Issue(3) : 379-394

INFLUENCE OF SHELL STRUCTURE ON DEEP INELASTIC COLLISIONS

WU En-Chiu ^,

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A kinematically complete study of the symmetric systems ¹⁵⁴Sm+¹⁵⁴Sm and ¹⁴⁴Sm+¹⁴⁴Sm has been performed at energies 30% in excess of the interaction barrier. They have been chosen because of their different internal structure: ¹⁴⁴Sm has a closed N=82 neutron shell and hence a spherical ground state confighration; ¹⁵⁴Sm with ten neutrons outside this shell is strongly deformed. Over the whole range of kinetic energy loss the variances of the measured mass distributions were found to be similar in both reactions, whereas the variances of the element distributions are considerably larger at small energy losses in the ¹⁴⁴Sm system. Based on the shell-corrected potential energy surface these observations are attributed to the closed N=82 neutron shell which, for ¹⁴⁴Sm, hinders the neutron exchange and leads to a preferential transfer of protons.

References

[1]

J. R. Huizenga, J. R. Birkelund, W. U. Sehroder, g. L. Wolf and Y. E. Viola, Phys. Rev. Letta., 37(1976), 885.[2] H. Freiealeben, K. D. Hildenbrand, F. Puhlhofer, W. F. W. Schneider, R. Bock, D. v. Harrach and H. J. Spech, Z. Physik, A292(1979), 171.[3] T. Tanabe, R, Bock, M.Dakowski, A. Gobbi,H. Saran, H. Stelzer, U. Lynen, A, Olmi and D. Pelte, Nucl. Phys., A342 (19801)194.[4] E. C. Wu, K. D. Hildsnbrand. H. Freiesleben. A. Gobbi. A. Olmi, H. Sann and U. Lynen, Phys. Rev. Lett. 47(19811)1874.[5] C. Lynen, H. Stelzer, A. Gobbi, H. Sane and A. Olmi, Nucl. Instr, Method, 162(1979), 657.[6] G. Auguatinski, H. Sann and人.Olmi, GSI Scientific Report, 1979 P. 179.[7] J. R. Birkelund and J. R. Huizenga, in USERDA Progress Report COO-3496-6:5, P. 131.[8] F. Beck, M. Dworzecka and H. Feldmeier, Z. Physik, A289(1978), 113.[9] W. D. Myers and W. J. Swiatecki, LBL——Report, UCRL——11980 (1965).[10] W. D.Myers and W. Swiatecki, Arkiv Fysik, 36(1967), 343.[11] J. Blocki, J. Randrup, W. J. Swiatecki and C. F. Tsang, Am. Phys., 105(1977), 429.

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WU En-Chiu. INFLUENCE OF SHELL STRUCTURE ON DEEP INELASTIC COLLISIONS[J]. Chinese Physics C, 1983, 7(3): 379-394.

WU En-Chiu. INFLUENCE OF SHELL STRUCTURE ON DEEP INELASTIC COLLISIONS[J]. Chinese Physics C, 1983, 7(3): 379-394. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

INFLUENCE OF SHELL STRUCTURE ON DEEP INELASTIC COLLISIONS

WU En-Chiu ^,

Corresponding author: WU En-Chiu,

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1983-06-05

Abstract: A kinematically complete study of the symmetric systems ¹⁵⁴Sm+¹⁵⁴Sm and ¹⁴⁴Sm+¹⁴⁴Sm has been performed at energies 30% in excess of the interaction barrier. They have been chosen because of their different internal structure: ¹⁴⁴Sm has a closed N=82 neutron shell and hence a spherical ground state confighration; ¹⁵⁴Sm with ten neutrons outside this shell is strongly deformed. Over the whole range of kinetic energy loss the variances of the measured mass distributions were found to be similar in both reactions, whereas the variances of the element distributions are considerably larger at small energy losses in the ¹⁴⁴Sm system. Based on the shell-corrected potential energy surface these observations are attributed to the closed N=82 neutron shell which, for ¹⁴⁴Sm, hinders the neutron exchange and leads to a preferential transfer of protons.

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INFLUENCE OF SHELL STRUCTURE ON DEEP INELASTIC COLLISIONS

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