WJNST  Vol.5 No.2 , April 2015
Two Ways of High-Energy Heavy Ion Interactions: Spallation and Burst
ABSTRACT
A new approach to solving the observation of enhanced neutron production in high-energy heavy ion induced reactions in thick targets is presented. Two different reaction mechanisms in these interactions are considered: 1) Limited fragmentation of the projectile, called SPALLATION; 2) Complete nuclear fragmentation of the projectile fragment into individual relativistic hadrons only, referred to as “BURST”. The abundance of this second path increases with the charge and energy of the projectile and may be responsible for enhanced neutron production observed with radiochemical methods in 44 GeV 12C and 72 GeV 40Ar irradiations. Interactions of 72 GeV 22Ne in nuclear emulsions show that SPALLATION and BURST have strongly different interaction signatures, and also that the rate of BURSTS increases from (26 ± 3)% of all interactions in the 1st generation to (78 ± 6)% in the 2nd generation. Further experimental signatures of BURSTS will be described; however, no model based on physics concepts can be presented. This effect may have practical consequences for neutron safety considerations in the construction of advanced heavy ion accelerators.

Cite this paper
Brandt, R. , Ditlov, V. , Haiduc, M. , Firu, E. , Neagu, A. , Ganssauge, E. , Hashemi-Nezhad, R. and Westmeier, W. (2015) Two Ways of High-Energy Heavy Ion Interactions: Spallation and Burst. World Journal of Nuclear Science and Technology, 5, 73-87. doi: 10.4236/wjnst.2015.52007.
References
[1]   Ganssauge, E., Westmeier, W. and Brandt, R. (2013) Potential Correlations between Unexplained Experimental Observables and Hot Projectile-Like Fragments in Primary Interactions above ECM /u ≈ 150 MeV. World Journal of Nuclear Science and Technology, 3, 155-161.

[2]   Hashemi-Nezhad, S.R., Zamani-Valasiadou, M., Krivopustov, M.I., Brandt, R., Ensinger, W., Odoj, R. and Westmeier, W. (2011) Neutron Production in Thick Targets Irradiated With High Energy Ions. Physics Research International, 2011, Article ID: 128429.

[3]   Westmeier, W., Brandt, R., Hashemi-Nezhad, S.R., Odoj, R., Sosnin, A.N., Ensinger, W. and Zamani-Valasiadou, M. (2012) Correlations in Nuclear Interactions between ECM/u and Unexplained Experimental Observables. World Journal of Nuclear Science and Technology, 2, 125-132.
http://dx.doi.org/10.4236/wjnst.2012.24019

[4]   (1996) Private Letter of the Late Professor E. Schopper (Frankfurt) to R.B. dated December 12, 1996.

[5]   Tolstov, K.D. (1991) Some Peculiarities of Relativistic Nucleus Collisions. International Journal of Radiation Applications and Instrumentation Part D: Nuclear Tracks and Radiation Measurements, 19, 657-664.

[6]   Cumming, J.B., Haustein, R.E., Ruth, T.J. and Virtes, G.J. (1978) Spallation of Copper by 80 GeV 40Ar Ions. Physical Review C, 17, 1632-1641.

[7]   Brandt R., Ditlov V.A., Dwivedi K.K., Ensinger W., Ganssauge E., Guo, S.-L., Haiduc, M., Hashemi-Nezhad, S.R., Khan, H.A., Krivopustov, M.I., Odoj, R., Pozharova, E.A., Smirnitzki, V.A., Sosnin, A.N., Westmeier, W. and Zamani-Valasiadou, M. (2008) Interactions of Relativistic Heavy Ions in Thick Heavy Element Targets and Some Unresolved Problems. Physics of Elementary Particles and Nuclei, 39, 507-526 (Original). (Reprinted: Physics of Particles and Nuclei, 39, 259-285.)

[8]   Friedlander, E.M., Gimpel, R.W., Heckman, H.H., Karant, Y.J., Judek, B. and Ganssauge, E. (1983) Anomalous Reaction Mean Free Path of Nuclear Projectile Fragments from Heavy Ion Collisions at 2 AGeV. Physical Review C, 27, 1489-1519.

[9]   Ganssauge, E. (1987) Der Experimentelle Stand der Anomalonen-Forschung Annalen der Physik, 7. Folge, 11, 202-246.

[10]   Szilard, L. (1929) über die Entropieverminderung in Einem Thermodynamischen System bei Eingriffen Intelligenter Wesen. Zeitschrift für Physik, 53, 840-856.

[11]   Ochs, M. (1997) Fachbereich Physikalische Chemie. Dissertation, Philipps-Universitat, Marburg.

[12]   Haase, G. (1990) Fachbereich Physikalische Chemie. Dissertation, Philipps-Universitat, Marburg.

[13]   Brandt, R. (1999) Measurements of Neutron Yields and Radioactive Isotope Transmutation in Collisions of Relativistic Ions with Heavy Target Nuclei. Report for the 85th Session of the JINR Scientific Council, Joint Institute for Nuclear Research, Dubna.

[14]   Ditlov, V.A., Dubinina, V.V., Krotkova, V.I., Pozharova, E.A., Smirnitzky, V.A., Brandt, R. and Ensinger, W. (2005) Study of the Number of Black Prongs in Two Generations of Nuclear Interactions in Photoemulsions Irradiated by 72 GeV 22Ne. Radiation Measurements, 40, 448-459.

[15]   Ditlov, V.A., Dubinina, V.V., Krotkova, V.I., Pozharova, E.A., Smirnitzky, V.A., Brandt, R., Westmeier, W. and Ensinger, W. (2006) Distribution of Black Prong Numbers of Fragments Measured in Two Generations of Nuclear Interactions in Photoemulsion Irradiated with 72 GeV 22Ne. Poster Presented at the XX International Conference on SSNTD, Beijing (Unpublished).

[16]   Haiduc, M., Firu, E. and Neagu, A.T. (2012) Internal Report from “Bucharest Institute of Space Sciences”. Bucharest, (Unpublished).

[17]   Pille, F. (1989) Technische Hochschule Leipzig. Dissertation (A) (Unpublished).

[18]   Ochs, M., Abdullaev, I.G., Adam, J., Adloff, J.C., Bersina, I.G., Bradnova, V., Brandt, R., Bognitzki, M., Butsev, V.S., Debeauvais, M., Dwivedi, K.K., Fernandez, F., Guo, S.-L., Krivopustov, M.I., Kulakov, B.A., Langrock, E.-J., Modolo, G., Odoj, R., Perelygin, V. P., Premyshev, A.N., Pronskich, V.S., Schmidt, Th., Sosnin, A.N., Stegailov, V.I., Sudowe, R., Vater, P., Wan, J.-S., Zamani, M. and Zupko-Sitnikov, V.M. (1997) SSNTD and Radiochemical Studies on the Transmutation of Nuclei UsingRelativistic Ions. Radiation Measurements, 28, 255-268.
http://dx.doi.org/10.1016/S1350-4487(97)00078-4

[19]   Westmeier, W., Odoj, R., Tyutyunnikov, S.I., Hashemi-Nezhad, S.R., Ensinger, W., Zamani-Valasiadou, M., Brandt, R. and Thomauske, B. (2011) Experimente zur Transmutation Langlebiger Radioaktiver Abfalle. atw International Journal for Nuclear Energy, 56, 620-628.

[20]   Aleklett, K., Brandt, R., Dersch, G., Feige, G., Friedlander, E.M., Ganssauge, E., Haase, G., Herrmann, J., Judek, B., McGaughey, P.L., Loveland, W., Porile, N.T., Schulz, W. and Seaborg, G.T. (1991) Erratum: Unusual Interaction of Projectile Fragments Produced by Relativistic Ar in Copper. Physical Review C, 44, 566.
http://dx.doi.org/10.1103/PhysRevC.44.566

[21]   Khan, H.A., Brandt, R., Kraft, G., Kraft-Weyrather, W. and Khan, N.A. (1991) Exceptionally High Multiplicity Events Observed in the Interaction of Relativistic Uranium Ions with Light Target Atoms. Nuclear Instruments and Methods in Physical Research B, 61, 497-501.
http://dx.doi.org/10.1016/0168-583X(91)95328-B

 
 
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