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FIZIKA B 6 (1997) 1, 45-51
 
HEAVY FRAGMENTS PRODUCED IN RELATIVISTIC 238U + 27Al
INTERACTIONS
D. P. BHATTACHARYYA, B. BASU, S. SAHA, P. PAL and S. BISWAS*
Department of Theoretical Physics, Indian Association for the
Cultivation of Science, Jadavpur, Calcutta 700 032, India
*Cosmic Ray and Space Physics Group, Tata Institute of Fundamental Research,
Homi Bhabha Road, Colaba Bombay 400 005, India
Received 29 January 1997
Revised manuscript received 7 February 1997
A stack consisting of the CR39 (DOP) plastics and an Al target has been exposed to the
927 MeV/n U beam from LBL BEVALAC at an angle of 30°
to study the large fragmentation phenomena and charge pick-up reactions. The plastic
plates below the Al target were etched for 29 hours in 6.25N NaOH aqueous solution at 70° C. About 4200 nuclei produced in the Al target were detected
in the plastics and their etch pit diameters have been measured. The distribution of the
diameters reflects the charge distribution of heavy fragments from U-projectiles with
charge ZF ranging from 88 to 91. The estimated partial cross-sections are
compared with the results derived from the model of Townsend et al. The observed charge
pick-up cross-section for charge change DZ = +1 has been found
to lie below the expected result from the scaling law of Guoxiao et al.
UDC 539.12
PACS 96.40.-z
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