Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies

F. Rejmund; A. Bethenod; P. Napolitani; J. Taieb; C. Villagrasa; L. Audouin; P. Armbruster; C. O. Bacri; J. Benlliure; M. Bernas; B. Berthier; A. Boudard; E. Casajeros; S. Czajkowski; J. J. Connell; T. Enqvist; T. Faesterman; J. S. George; A. Junghans; B. Jurado; F. Hammache; S. Leray; R. Legrain; R. A. Mewaldt; J. Pereira; M. V. Ricciardi; K. H. Schmidt; C. Stéphan; K. Sümmerer; L. Tassan-Got; C. Volant; M. E. Wiedenbeck; W. Wlazlo; N. E. Yanasak

doi:10.1556/APH.16.2002.1-4.10

Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies

F. Rejmund, A. Bethenod, P. Napolitani, J. Taieb, C. Villagrasa, L. Audouin, P. Armbruster, C. O. Bacri, J. Benlliure, M. Bernas, B. Berthier, A. Boudard, E. Casajeros, S. Czajkowski, J. J. Connell, T. Enqvist, T. Faesterman, J. S. George, A. Junghans, B. JuradoF. Hammache, S. Leray, R. Legrain, R. A. Mewaldt, J. Pereira, M. V. Ricciardi, K. H. Schmidt, C. Stéphan, K. Sümmerer, L. Tassan-Got, C. Volant, M. E. Wiedenbeck, W. Wlazlo, N. E. Yanasak

Radiology and Imaging

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Abstract

The isotopic distributions of fragments produced in the spallation of uranium are strongly influenced by the fission of the excited prefragments, highly fissile nuclei. The competition between fission and evaporation around the doubly-magic nucleus Pb is discussed. The light fragments from Fe beam are produced with a strong enhancement of even-even nuclei compared to the odd-odd in the region of nuclei with equal number of neutrons and protons, N ∼ Z. This staggering in the production of light fragments is not observed in the production of heavy fragments, and is in contradiction with the basis of the statistical model of deexcitation of a hot nucleus. Pairing interaction as a function of the excitation energy and as a function of the isospin of the nucleus are questioned.

Original language	English (US)
Pages (from-to)	85-91
Number of pages	7
Journal	Acta Physica Hungarica New Series Heavy Ion Physics
Volume	16
Issue number	1-4
DOIs	https://doi.org/10.1556/APH.16.2002.1-4.10
State	Published - 2002

Keywords

Fission probabilities
Proton-neutron pairing
Shell effect in level densities
Spallation reaction

ASJC Scopus subject areas

Nuclear and High Energy Physics
General Physics and Astronomy

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10.1556/APH.16.2002.1-4.10

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Rejmund, F., Bethenod, A., Napolitani, P., Taieb, J., Villagrasa, C., Audouin, L., Armbruster, P., Bacri, C. O., Benlliure, J., Bernas, M., Berthier, B., Boudard, A., Casajeros, E., Czajkowski, S., Connell, J. J., Enqvist, T., Faesterman, T., George, J. S., Junghans, A., ... Yanasak, N. E. (2002). Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies. Acta Physica Hungarica New Series Heavy Ion Physics, 16(1-4), 85-91. https://doi.org/10.1556/APH.16.2002.1-4.10

Rejmund, F, Bethenod, A, Napolitani, P, Taieb, J, Villagrasa, C, Audouin, L, Armbruster, P, Bacri, CO, Benlliure, J, Bernas, M, Berthier, B, Boudard, A, Casajeros, E, Czajkowski, S, Connell, JJ, Enqvist, T, Faesterman, T, George, JS, Junghans, A, Jurado, B, Hammache, F, Leray, S, Legrain, R, Mewaldt, RA, Pereira, J, Ricciardi, MV, Schmidt, KH, Stéphan, C, Sümmerer, K, Tassan-Got, L, Volant, C, Wiedenbeck, ME, Wlazlo, W & Yanasak, NE 2002, 'Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies', Acta Physica Hungarica New Series Heavy Ion Physics, vol. 16, no. 1-4, pp. 85-91. https://doi.org/10.1556/APH.16.2002.1-4.10

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title = "Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies",

abstract = "The isotopic distributions of fragments produced in the spallation of uranium are strongly influenced by the fission of the excited prefragments, highly fissile nuclei. The competition between fission and evaporation around the doubly-magic nucleus Pb is discussed. The light fragments from Fe beam are produced with a strong enhancement of even-even nuclei compared to the odd-odd in the region of nuclei with equal number of neutrons and protons, N ∼ Z. This staggering in the production of light fragments is not observed in the production of heavy fragments, and is in contradiction with the basis of the statistical model of deexcitation of a hot nucleus. Pairing interaction as a function of the excitation energy and as a function of the isospin of the nucleus are questioned.",

keywords = "Fission probabilities, Proton-neutron pairing, Shell effect in level densities, Spallation reaction",

author = "F. Rejmund and A. Bethenod and P. Napolitani and J. Taieb and C. Villagrasa and L. Audouin and P. Armbruster and Bacri, {C. O.} and J. Benlliure and M. Bernas and B. Berthier and A. Boudard and E. Casajeros and S. Czajkowski and Connell, {J. J.} and T. Enqvist and T. Faesterman and George, {J. S.} and A. Junghans and B. Jurado and F. Hammache and S. Leray and R. Legrain and Mewaldt, {R. A.} and J. Pereira and Ricciardi, {M. V.} and Schmidt, {K. H.} and C. St{\'e}phan and K. S{\"u}mmerer and L. Tassan-Got and C. Volant and Wiedenbeck, {M. E.} and W. Wlazlo and Yanasak, {N. E.}",

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doi = "10.1556/APH.16.2002.1-4.10",

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T1 - Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies

AU - Rejmund, F.

AU - Bethenod, A.

AU - Napolitani, P.

AU - Taieb, J.

AU - Villagrasa, C.

AU - Audouin, L.

AU - Armbruster, P.

AU - Bacri, C. O.

AU - Benlliure, J.

AU - Bernas, M.

AU - Berthier, B.

AU - Boudard, A.

AU - Casajeros, E.

AU - Czajkowski, S.

AU - Connell, J. J.

AU - Enqvist, T.

AU - Faesterman, T.

AU - George, J. S.

AU - Junghans, A.

AU - Jurado, B.

AU - Hammache, F.

AU - Leray, S.

AU - Legrain, R.

AU - Mewaldt, R. A.

AU - Pereira, J.

AU - Ricciardi, M. V.

AU - Schmidt, K. H.

AU - Stéphan, C.

AU - Sümmerer, K.

AU - Tassan-Got, L.

AU - Volant, C.

AU - Wiedenbeck, M. E.

AU - Wlazlo, W.

AU - Yanasak, N. E.

PY - 2002

Y1 - 2002

N2 - The isotopic distributions of fragments produced in the spallation of uranium are strongly influenced by the fission of the excited prefragments, highly fissile nuclei. The competition between fission and evaporation around the doubly-magic nucleus Pb is discussed. The light fragments from Fe beam are produced with a strong enhancement of even-even nuclei compared to the odd-odd in the region of nuclei with equal number of neutrons and protons, N ∼ Z. This staggering in the production of light fragments is not observed in the production of heavy fragments, and is in contradiction with the basis of the statistical model of deexcitation of a hot nucleus. Pairing interaction as a function of the excitation energy and as a function of the isospin of the nucleus are questioned.

AB - The isotopic distributions of fragments produced in the spallation of uranium are strongly influenced by the fission of the excited prefragments, highly fissile nuclei. The competition between fission and evaporation around the doubly-magic nucleus Pb is discussed. The light fragments from Fe beam are produced with a strong enhancement of even-even nuclei compared to the odd-odd in the region of nuclei with equal number of neutrons and protons, N ∼ Z. This staggering in the production of light fragments is not observed in the production of heavy fragments, and is in contradiction with the basis of the statistical model of deexcitation of a hot nucleus. Pairing interaction as a function of the excitation energy and as a function of the isospin of the nucleus are questioned.

KW - Fission probabilities

KW - Proton-neutron pairing

KW - Shell effect in level densities

KW - Spallation reaction

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JO - Acta Physica Hungarica New Series Heavy Ion Physics

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ER -

Disappearance of shell effects and persistence of an even-odd staggering in the fragment production in nuclear reactions at relativistic energies

Abstract

Keywords

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