Application of CLTD’s for High Resolution Mass Identification and for Stopping Power Measurements of Heavy Ions

Abstract

An array of calorimetric low temperature detectors (CLTD's) for energy sensitive detection of heavy ions was combined with time-of-flight (TOF) detectors to obtain a detector system for high resolution mass identification of low energy heavy ions. In addition the same setup was used to prove the ability of CLTD's to be used in electronic stopping power measurements for heavy ions in matter. Experiments with 50 MeV 63 Cu and 65 Cu ions at the tandem accelerator at the MPI at Heidelberg, and with 25 to 250 MeV 238 U ions at the UNILAC accelerator at GSI at Darmstadt have been performed. For 63,65 Cu at 50 MeV a mass resolution of m(FWHM) = 0.9 amu, and for 238 U in an energy range of 65 to 150 MeV a resolution of m(FWHM) = 1.28 amu, was obtained. The results for stopping powers of 238 U in carbon and gold are presented and compared with theoretical predictions and data from the literature.

Carbon Elastic and Inelastic Stopping-Power Components for Heavy Ions at Bohr and Higher Velocities

“…A similar difference is seen for the U data of the same authors. These data, together with others [12,30], are in satisfactory agreement with each other. The U data [12] presented as the SP e values were corrected for SP n in the same way as was performed for the Br and I data [12].…”

“…HI (different symbols correspond to the different specified HIs). The references to the primary author(s) of the work(s) [2,7,10,12,20,23,24,[26][27][28][29][30], where the SP data were presented, are also indicated.…”

“…The steep fall from the Au SP data [23,29] to those obtained at 0.8v 0 [11] led to the large b t and k t fitted values (obtained with large errors), which noticeably exceeded those for other HIs (see Table 1). Figure 19 shows the Pb and U SP data [11,12,20,30], and those obtained by Geissel et al (taken from the database [2]) in comparison to SRIM calculations. Though the Pb data [20] and those of Geissel et al are in some disagreement with each other, they were fitted together with Equation (8).…”

Application of Calorimetric Low Temperature Detectors (CLTD’s) for Precise Stopping Power Measurements of Heavy Ions in Matter

“…However, for high ion masses and low energies ionization based energy detectors, that are commonly used in experiments for stopping power determination [3,4], suffer from incomplete energy detection, resulting in pulse height defect and a relatively poor energy resolution. As CLTD's provide substantially better energy resolution and linearity for heavy ion detection, with the absence of any pulse height defect [5,6], this type of energy detectors has the potential to increase sensitivity and accuracy for dE/dx measurements and to extend the accessible energy range towards lower energies.For that purpose a CLTD array, that has been developed at GSI in the past years [5,6,7], has been used to replace the Si-detector in an established setup for dE/dx measurements at the K-130 cyclotron at the University of Jyväskylä [3,8], and to perform measurements with 0.05-1 MeV/u 131 Xe-ions in different absorber materials. As an example the measured electronic stopping power of Xe ions in carbon is displayed in fig.…”

“…For that purpose a CLTD array, that has been developed at GSI in the past years [5,6,7], has been used to replace the Si-detector in an established setup for dE/dx measurements at the K-130 cyclotron at the University of Jyväskylä [3,8], and to perform measurements with 0.05-1 MeV/u 131 Xe-ions in different absorber materials. As an example the measured electronic stopping power of Xe ions in carbon is displayed in fig.…”