Interactions of 100 MeV/nucleon /sup 40/Ar with uranium

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Fragments produced in the interactions of 100 MeV/nucleon /sup 40/Ar projectiles with a uranium target were measured at energies from 10 to 130 MeV/nucleon at angles from 10 to 170/sup 0/. Nuclei with charge 5 less than or equal to Z less than or equal to 10 were observed. The data can roughly be divided into two groups, corresponding to central and pripheral collisions. The central collision data can be fit with a thermal model that uses two recoiling sources. The source velocities are consistent with predictions of the fireball and target explosion models, but the source temperatures inferred from ... continued below

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Pages: 98

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Frankel, K.A. December 1, 1979.

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  • Lawrence Berkeley Laboratory
    Publisher Info: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
    Place of Publication: Berkeley, California

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Fragments produced in the interactions of 100 MeV/nucleon /sup 40/Ar projectiles with a uranium target were measured at energies from 10 to 130 MeV/nucleon at angles from 10 to 170/sup 0/. Nuclei with charge 5 less than or equal to Z less than or equal to 10 were observed. The data can roughly be divided into two groups, corresponding to central and pripheral collisions. The central collision data can be fit with a thermal model that uses two recoiling sources. The source velocities are consistent with predictions of the fireball and target explosion models, but the source temperatures inferred from the data are higher than one would expect on the basis of energy and momentum conservation. These results are similar to those obtained in previous studies at beam energies of 400 and 500 MeV/nucleon. The data also follow the pattern of a universal curve of invariant cross section vs momentum. The projectile fragmentation data are also fit by two thermal sources. There are indications that the observed temperatures are higher than one would expect on the basis of other projectile fragmentation studies. The projectile fragmentation data are studied in terms of a simple friction model. Order-of-magnitude estimates show that the data may be consistent with the model, but further development, calculation, and experimentation are necessary to check the validity of the model at this beam energy. A preliminary investigation is made of the possibility that the projectile may pick up one or more target nucleons before it fragments. This process leads to widening of the distributions at large momentum transfers. Much of the spectrum can be described by falling exponentials in energy in the emitting frames. It is concluded that the observed spectrum is due to nonthermal sources as the temperatures derived from the slopes of the exponentials are greater than those predicted. 26 figures, 6 tables.

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Pages: 98

Notes

NTIS, PC A05/MF A01.

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  • Other Information: Thesis

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  • Report No.: LBL-10980
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/5363481 | External Link
  • Office of Scientific & Technical Information Report Number: 5363481
  • Archival Resource Key: ark:/67531/metadc1067881

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1979

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • April 24, 2018, 4:44 p.m.

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Frankel, K.A. Interactions of 100 MeV/nucleon /sup 40/Ar with uranium, report, December 1, 1979; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1067881/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.