Systematics of scaling of heavy ion blocking in thin silicon crystals

Nuclear decay times of evaporation residues ofTi44by crystal blocking method

“…In Ref. [3] we have shown that scaling is valid over a wide range of E/Z for a variety of projec-~Ĩ tiles. %'e have also seen that the blocking pattern for the evaporation residues (E 1 MeV/Z) does not show any difFerence with target crystal thickness ranging &om 0.7 to 1.5 pm, which indeed shows that multiple scattering efFects do not pose a serious problem in the present measurements.…”

“…The detector gives both X and Y position information along with the total energy (E) of these particles. Even though the peripheral region of the detector shows pin-cushion distortion, the central 10 x 10 mm portion of the detector shows good linearity and gives position resolution better than 1 mm [3]. This central region of the detector has been used for the present studies.…”

“…1'. The details of the preparation of the thin Si single crystal target and the experimental setup are described in [3,4]. We have used the time of flight (T) discrimination method in conjunction with charged particle blocking using a pulsed beam for separating the reaction products.…”

“…reaction at 100 MeV incident energy from the change in the scaled blocking dip volume. We have shown recently [3] that both the dip volume and the minimum yield can be used for getting lifetimes Rom the observed blocking dips using appropriate scaling. In the present studies both the above mentioned parameters are used to obtain the lifetime information and are seen to yield consistent results.…”

Ionization studies of channelled hydrogen-like F ions in a Si single crystal

“…The initial measurements were carried out with a 0.17 µm thick Si single crystal which we also used in earlier measurements [4,5]. However, this crystal had to be abandoned because it broke during measurement and another crystal of thickness 0.75 µm which was also produced by chemical etching [22] of a 300 µm thick Si single crystal ( 100 , n-type, device grade), was used. Its performance for channelling purposes was found to be inferior to the crystal used earlier.…”