Penetration of heavy ions through matter

Schmidt‐Böcking, H.

doi:10.1007/3-540-08931-4_17

Cited by 8 publications

(5 citation statements)

References 131 publications

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“…In this section a short summary on the kinematics of the recoiling target ion and the information which is contained in the recoil momentum will be given which is helpful for the interpretation and understanding of the experimental results reviewed in section 4. Details can be found in previous publications (Ullrich et al 1988b, Schmidt-Böcking et al 1990, Mergel 1994, Rodríguez et al 1995a, see also Fastrup 1980. Since recoilion momentum spectroscopy has mainly been used in fast ion-atom collisions, emphasis is given to this specific subject.…”

Section: Kinematicsmentioning

confidence: 99%

Recoil-ion momentum spectroscopy

Ullrich¹,

Moshammer

Dørner

et al. 1997

J. Phys. B: At. Mol. Opt. Phys.

495

284

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High-resolution recoil-ion momentum spectroscopy (RIMS) is a novel technique to determine the charge state and the complete final momentum vector P R of a recoiling target ion emerging from an ionizing collision of an atom with any kind of radiation. It offers a unique combination of superior momentum resolution in all three spatial directions of P R = 0.07 au with a large detection solid angle of R /4π 98%. Recently, low-energy electron analysers based on rigorously new concepts and reaching similar specifications were successfully integrated into RIM spectrometers yielding so-called 'reaction microscopes'.Exploiting these techniques, a large variety of atomic reactions for ion, electron, photon and antiproton impact have been explored in unprecedented detail and completeness. Among them kinematically complete experiments on electron capture, single and double ionization in ionatom collisions at projectile energies between 5 keV and 1.4 GeV have been carried out. Double photoionization of He has been investigated at energies E γ close to the threshold (E γ = 80 eV) up to E γ = 58 keV. At E γ > 8 keV the contributions to double ionization after photoabsorption and Compton scattering were separated kinematically for the first time. These and many other results will be reviewed in this paper. In addition, the experimental technique is described in some detail and emphasis is given to envisaging the rich future potential of the method in various fields of atomic collision physics with atoms, molecules and clusters.

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Section: Kinematicsmentioning

confidence: 99%

Recoil-ion momentum spectroscopy

Ullrich¹,

Moshammer

Dørner

et al. 1997

J. Phys. B: At. Mol. Opt. Phys.

495

284

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“…The last term is a correction for finite energy losses in the absorber [17]. The average charge stage Q~ of the incident ion is calculated according to formulas given in ref.…”

Section: The Total-energy Signalsmentioning

confidence: 99%

A detection system for energetic light heavy ions

Engelen

Jelmersma

Brink

et al. 1984

Nuclear Instruments and Methods in Physics Research Section A:

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A light heavy ion detection system which consists of a gas-filled ionization chamber (IC) connected to a scattering chamber via a time-of-flight (TOF) system has been constructed. The entrance window of the IC has an area of 14 × 40 cm 2, the active depth is 115 cm. Filled with CF 4 at a pressure of 350 Torr, the energy range for t2C and ~Ar is 5-20 MeV/A and 6-30 MeV/A, respectively. The TOF system consists of two parallel plate avalanche counters with a flightpath of 70 cm or 170 cm in between. The IC has been tested with 12C ions at an energy of 39 MeV, The energy resolution of the IC (1.1%) is mainly determined by the energy straggling in the foils of the TOF system and the ionization chamber. The energy-loss resolution is 3.5%, the horizontal position resolution varies between 6 and 20 mm and the vertical position resolution is 2 mm. The time resolution of the TOF system ranges from 800 ps for 4He at 5.0 MeV, to 280 ps for 2SSi at 55 MeV.

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“…The good quality of the aluminum foil stack in an absolute sense becomes also evident in fig. 9b where the measured straggling widths are compared to theoretical values, calculated with the empirical expression 20) given in ref.…”

Section: Doubl'j-grid Techniquementioning

confidence: 99%

Accelerator mass spectrometry and radioisotope detection at the Argonne FN tandem facility

Henning

Kutschera

Paul

et al. 1981

Nuclear Instruments and Methods

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The Argonne FN tandem accelerator and standard components of its experimental heavy-ion research facility, have been used as a highlysensitive mass spectrometer to detect several long-lived radioisotopes and measure their concentration by counting of accelerated ions. Background beams from Isobaric nuclei have been eliminated by combining the dispersion from the energy loss in a uniform Al foil stack with the momentum resolution of an Enge split-pole magnetic spectrograph. Radioisotope concentrations in the following ranges have been measured: U C/ 12 C = 10" 12 to 1O~1 3 , 26 A1/ 27 A1-lO" 10 to 10" 12 , 32 Si/Si = 10~8 to 10~1 4 , 36 C1/C1 = 10" 10 to 10" 11. Particular emphasis was put on exploring to what extent the technique of identifying and counting individual ions in an accelerator beam can be conveniently used to determine nuclear quantities of interest when their measurement involves very low radioisotope concentrations. We are able to demonstrate the usefulness of this method by measuring the Mg(p,n) Al(7.2 x 10 yr) cross section at proton energies in the astrophysically interesting range just above threshold, and by determining the previously poorly 32 known half life oi Si.

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Penetration of heavy ions through matter

Cited by 8 publications

References 131 publications

Recoil-ion momentum spectroscopy

Recoil-ion momentum spectroscopy

A detection system for energetic light heavy ions

Accelerator mass spectrometry and radioisotope detection at the Argonne FN tandem facility

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