New supersonic gas jet target for low energy nuclear reaction studies

Abstract

A windowless supersonic gas jet target (SUGAR) has been put in operation recently in Mexico. It is the first target of its kind in the country and the region. New research opportunities become available with this facility through the study of the direct beam-gas interaction: nuclear physics and astrophysics, atomic physics, interaction of radiation with matter and other interdisciplinary applications. A general description of the apparatus and its commissioning is given here. Air, nitrogen and argon jets were produced. Proton and deuteron beams were used to measure key parameters of the system to compare with theoretical estimates. In addition, as a first study case, we present data from the 14 Nðd; αÞ 12 C reaction, at center of mass energies between 1.9 and 3.0 MeV with an E-ΔE telescope detector at 35°. Excitation functions for several excited states were constructed and an 16 O resonance at 22.72 MeV was confirmed.

Exploratory investigation of the HIPPO gas-jet target fluid dynamic properties

“…This rapid prototyping can then be accompanied by the more time-consuming experimental verification studies of the gas-jet density distributions resulting from the most promising simulations. Given the ambiguity demonstrated in this work of elastic scattering yield data with respect to determining the gas-jet volumetric density profile, future verification studies should include alternative methods such as electronbeam induced fluorescence and Schlieren photography, if possible [7,25]. The findings of this and future studies of the fluid dynamic properties of the HIPPO gas-jet target will provide important input to help improve the performance of future gas-jet nuclear reaction targets required for recoil separators [26], reaction studies in ion storage rings [27,28], and reaction studies requiring high beamintensities [25], which will play a pivotal role in advancing experimental nuclear astrophysics.…”

Monoisotopic targets production from atomic and molecular positive ion implantation in a tandem accelerator at low energies

“…For that reason we undertook the development of monoisotopic thin targets by means of ion implantation. A useful reference for "thin" could be those produced by supersonic gas jet flow [45] that achieve areal densities from 10 16 to 10 19 atom/cm 2 . That is as thin as ten typical atomic layers in solids and as thick as ten thousand.…”

Status of the JENSA gas-jet target for experiments with rare isotope beams

“…SUGAR, a supersonic gas-jet target for low energy nuclear reaction studies, features a rectangular nozzle and is described by Favela et al [29,30]. Air, argon and nitrogen jets were characterized with Elastic Backscattering Spectrometry (EBS) and resulted in maximum jet thicknesses of (1.80 ± 0.18) × 10 18 atoms/cm 2 for argon at an input pressures of 300 kPa and (3.7 ± 0.4) × 10 18 atoms/cm 2 for nitrogen at an input pressure of 250 kPa.…”

“…Air, argon and nitrogen jets were characterized with Elastic Backscattering Spectrometry (EBS) and resulted in maximum jet thicknesses of (1.80 ± 0.18) × 10 18 atoms/cm 2 for argon at an input pressures of 300 kPa and (3.7 ± 0.4) × 10 18 atoms/cm 2 for nitrogen at an input pressure of 250 kPa. Values are taken from Figure 3 of reference [29] assuming a typographical mistake in the x-axis label, accidentally stating psi instead of bar [30]. The areal density of the air jet is only given to be around 10 18 atoms/cm 2 while injecting air at atmospheric pressure.…”