Fragmentation studies of high-energy ions using CR39 nuclear track detectors

Abstract

We report on the measurements of the total charge changing fragmentation cross sections in high-energy nucleus-nucleus collisions using Fe, Si and Pb incident ions. Several stacks of CR39 nuclear track detectors with different target combinations were exposed at normal incidence to high energy accelerator beams to integrated densities of about 2000 ions/cm 2 . The nuclear track detector foils were chemically etched, and ion tracks were measured using an automatic image analyser system. The cross section determination is based on the charge identification of beam ions and their fragments and on the reconstruction of their path through the stacks.

Development of an automated scanning system for the analysis of heavy ions' fragmentation reaction by nuclear track detectors

“…Target and CR-39 detectors were exposed to 1 GeV Fe ions. The preliminary value of total charge-changing cross section is 1289 mb, in good agreement with the results of other experiments (Togo et al, 2007;Cecchini et al, 2008). The estimated error is about 10%.…”

Plasma-laser ion discrimination by TOF technique applied to coupled SiC detectors.

“…With the availability of high intensities (≥10 16 W/cm 2 ) laser-target interaction has evidenced nuclear events characterized by fast neutrons and/or recoiling ions involved in the induced specific reactions [1][2][3][4][5][6][7][8]. Estimated reaction rates and, consequently potential applications, are strongly depending on the neutron efficiency values and ion discrimination.…”

“…Thompson Spectrometer (TP), which could give almost complete ion discrimination [14,15], presents the disadvantage of very small acceptance because of needed entrance-pinhole. On the other side, many attempts have been introduced in the past, to get more efficient CR-39 discrimination by coupling the diameter with other parameters (length [16,17] ), (grey levels [18] ), with scarce experimental pursuance. TOF devices based on Silicon Carbide (SiC) and diamond detectors, almost insensitive to visible and near UV light, have been used to determine the possible energy of ions and to obtain a rough estimation of yields.…”

Nuclear tracks in PADC induced by neutron, heavy ion and energetic fragments formed in the reaction 54Cr+208Pb, at 320MeV

“…Sahu et al (2005) give an interesting results for the fragment mass distribution for the 372 MeV 56 Fe þ 232 Th reaction meanwhile Thomas et al (2007) investigated the mass distribution of fission and binary fragmentation of the excited nuclear system with Z ¼ 116 in the 80 Se þ 208 Pb reaction (470-630 MeV). Togo et al (2007) give experimental evidence that passive PADC detector's are useful in studies of Fe, Si and C ion interactions with CR-39 (C 12 H 18 O 7 ) and Al targets due to their sensitivity for a wide range of charges above Z ¼ 6e in the relativistic energy region. Pá lfalvi et al (2005) furthermore demonstrated their importance for dosimetry measurements in galactic cosmic ray (GCR) studies on the ISS since provide information on rare reaction product in an integral form trough latent track formation.…”