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Phys. Rev. C 62, 051602(R) (2000) [5 pages]

Isospin of intermediate mass fragments produced in peripheral, midperipheral, and central collisions from the 58Ni+12C,24Mg reactions at 34.5A MeV

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Y. Larochelle1, L. Gingras1, G. C. Ball2,*, L. Beaulieu1,†, P. Gagné1,‡, E. Hagberg2, Z. Y. He1, D. Horn2, R. Laforest2,§, R. Roy1, and C. St-Pierre1
1Laboratoire de Physique Nucléaire, Département de Physique, Université Laval, Saint Foy, Québec, Canada G1K 7P4
2Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1JO

Received 12 June 2000; published 20 October 2000

Isotopic yields of IMF’s produced in the 58Ni+12C,24Mg reactions at 34.5A MeV are investigated. Analysis of experimental data from the CRL-Laval 4π multidetector array focuses on events where at least 75% (60%) of the charge and momentum were detected for the 58Ni+12C (58Ni+24Mg) system. Averaged isospin ratios (N/Z) for IMF’s with Z=3 and 4 are plotted as a function of emission angle and parallel velocity in the center-of-mass frame. Results from simulations with the statistical codes SMM and GEMINI, assuming an equilibrated source, are compared to the experimental ratios. The ratios seem to indicate the presence of a midrapidity necklike structure that would produce IMF’s richer in neutrons than the two main emitters, even for very central collisions.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.62.051602
DOI:
10.1103/PhysRevC.62.051602
PACS:
25.70.Lm, 25.70.Mn

*Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3.

†Present address: CHUQ, Hotel-Dieu de Québec, Service de Radio-oncologie et Centre de Recherche en Cancérologie de l’Université Laval, 11 Côte du Palais, Québec, Canada G1R 2J6.

‡Present address: Les Services Conseils Systématix, Inc., 830, Ernest-Gagnon, Edifice 4, Le Samuel-Holland, Bureau 201, Québec, Canada G1S 3R3.

§Present address: Mallinckrodt Institute of Radiology, 510 S. Kinghighway, St. Louis, MO 63110.

 
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