Effect of system N/Z on the enhanced production of even-Z fragments observed in heavy ion reactions

E. M. Winchester; J. A. Winger; R. Laforest; E. Martin; E. Ramakrishnan; D. J. Rowland; A. Ruangma; S. J. Yennello; G. D. Westfall; A. Vander Molen; E. Norbeck

doi:10.1103/PhysRevC.63.014601

Effect of system N/Z on the enhanced production of even-Z fragments observed in heavy ion reactions

E. M. Winchester, J. A. Winger, R. Laforest, E. Martin, E. Ramakrishnan, D. J. Rowland, A. Ruangma, S. J. Yennello, G. D. Westfall, A. Vander Molen, E. Norbeck

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Abstract

The enhancement in the production of even-Z nuclei observed in nuclear fission has also been observed in fragments produced from heavy ion collsions. Beams of ⁴⁰Ar, ⁴⁰Cl, and ⁴⁰Ca at 25 MeV/nucleon were impinged on ⁵⁸Fe and ⁵⁸Ni targets. The resulting fragments were detected using the MSU 4 π detector array, which had additional silicon detectors for better isotopic resolution. Comparison of the ratios of yields for each element showed enhancement of even-Z fragment production. The enhancement was more pronounced for reactions with a greater difference in the N/Z of the compound system. However, this effect was less for systems that were more neutron rich. The average N/Z for fragments also displayed an odd-even effect with a lower average N/Z for the even-Z fragments. This is related to the greater availability of neutron-poor isotopes for even-Z nuclei.

Original language	English
Article number	014601
Pages (from-to)	146011-146014
Number of pages	4
Journal	Physical Review C - Nuclear Physics
Volume	63
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.63.014601
State	Published - Jan 2001

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Winchester, E. M., Winger, J. A., Laforest, R., Martin, E., Ramakrishnan, E., Rowland, D. J., Ruangma, A., Yennello, S. J., Westfall, G. D., Vander Molen, A., & Norbeck, E. (2001). Effect of system N/Z on the enhanced production of even-Z fragments observed in heavy ion reactions. Physical Review C - Nuclear Physics, 63(1), 146011-146014. Article 014601. https://doi.org/10.1103/PhysRevC.63.014601

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title = "Effect of system N/Z on the enhanced production of even-Z fragments observed in heavy ion reactions",

abstract = "The enhancement in the production of even-Z nuclei observed in nuclear fission has also been observed in fragments produced from heavy ion collsions. Beams of 40Ar, 40Cl, and 40Ca at 25 MeV/nucleon were impinged on 58Fe and 58Ni targets. The resulting fragments were detected using the MSU 4 π detector array, which had additional silicon detectors for better isotopic resolution. Comparison of the ratios of yields for each element showed enhancement of even-Z fragment production. The enhancement was more pronounced for reactions with a greater difference in the N/Z of the compound system. However, this effect was less for systems that were more neutron rich. The average N/Z for fragments also displayed an odd-even effect with a lower average N/Z for the even-Z fragments. This is related to the greater availability of neutron-poor isotopes for even-Z nuclei.",

author = "Winchester, {E. M.} and Winger, {J. A.} and R. Laforest and E. Martin and E. Ramakrishnan and Rowland, {D. J.} and A. Ruangma and Yennello, {S. J.} and Westfall, {G. D.} and {Vander Molen}, A. and E. Norbeck",

year = "2001",

month = jan,

doi = "10.1103/PhysRevC.63.014601",

language = "English",

volume = "63",

pages = "146011--146014",

journal = "Physical Review C - Nuclear Physics",

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Winchester, EM, Winger, JA, Laforest, R, Martin, E, Ramakrishnan, E, Rowland, DJ, Ruangma, A, Yennello, SJ, Westfall, GD, Vander Molen, A & Norbeck, E 2001, 'Effect of system N/Z on the enhanced production of even-Z fragments observed in heavy ion reactions', Physical Review C - Nuclear Physics, vol. 63, no. 1, 014601, pp. 146011-146014. https://doi.org/10.1103/PhysRevC.63.014601

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T1 - Effect of system N/Z on the enhanced production of even-Z fragments observed in heavy ion reactions

AU - Winchester, E. M.

AU - Winger, J. A.

AU - Laforest, R.

AU - Martin, E.

AU - Ramakrishnan, E.

AU - Rowland, D. J.

AU - Ruangma, A.

AU - Yennello, S. J.

AU - Westfall, G. D.

AU - Vander Molen, A.

AU - Norbeck, E.

PY - 2001/1

Y1 - 2001/1

N2 - The enhancement in the production of even-Z nuclei observed in nuclear fission has also been observed in fragments produced from heavy ion collsions. Beams of 40Ar, 40Cl, and 40Ca at 25 MeV/nucleon were impinged on 58Fe and 58Ni targets. The resulting fragments were detected using the MSU 4 π detector array, which had additional silicon detectors for better isotopic resolution. Comparison of the ratios of yields for each element showed enhancement of even-Z fragment production. The enhancement was more pronounced for reactions with a greater difference in the N/Z of the compound system. However, this effect was less for systems that were more neutron rich. The average N/Z for fragments also displayed an odd-even effect with a lower average N/Z for the even-Z fragments. This is related to the greater availability of neutron-poor isotopes for even-Z nuclei.

AB - The enhancement in the production of even-Z nuclei observed in nuclear fission has also been observed in fragments produced from heavy ion collsions. Beams of 40Ar, 40Cl, and 40Ca at 25 MeV/nucleon were impinged on 58Fe and 58Ni targets. The resulting fragments were detected using the MSU 4 π detector array, which had additional silicon detectors for better isotopic resolution. Comparison of the ratios of yields for each element showed enhancement of even-Z fragment production. The enhancement was more pronounced for reactions with a greater difference in the N/Z of the compound system. However, this effect was less for systems that were more neutron rich. The average N/Z for fragments also displayed an odd-even effect with a lower average N/Z for the even-Z fragments. This is related to the greater availability of neutron-poor isotopes for even-Z nuclei.

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Effect of system N/Z on the enhanced production of even-Z fragments observed in heavy ion reactions

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