A hot cavity laser ion source at IGISOL

Abstract

Abstract. A development program is underway at the IGISOL (Ion Guide Isotope Separator On-Line) facility, University of Jyväskylä, to efficiently and selectively produce low-energy radioactive ion beams of silver isotopes and isomers, with a particular interest in N=Z 94 Ag. A hot cavity ion source has been installed, based on the FEBIAD (Forced Electron Beam Induced Arc Discharge) technique, combined with a titanium:sapphire laser system for selective laser ionization. The silver recoils produced via the heavy-ion fusion-evaporation reaction, 40 Ca 58 Ni, p3n 94 Ag, are stopped in a graphite catcher, diffused, extracted and subsequently ionized using a three-step laser ionization scheme. The performance of the different components of the hot cavity laser ion source is discussed and initial results using stable 107,109 Ag are presented.PACS. 42.55.-f Lasers -32.80.Fb Photoionization of atoms and ions

Mass measurements of neutron-deficient nuclei and their implications for astrophysics

“…The masses of 94 Ag and 93 Pd have been shown to have a high impact on rp process models thus should be measured. 93 Pd could be produced at HIGISOL whereas for 94 Ag, a special hot cavity laser ion source has been developed [139]. Since the half-life of the 94 Ag ground-state is only around 30 ms, it is too short-lived for measurements at JYFLTRAP.…”

Mass measurements near the Z = N line with JYFLTRAP

“…These improvements will help to identify the measured states. Tests for laser ionization of silver in the hot-cavity laser ion source have been performed [31] and the aim is to produce 94 Ag m (21 + ) at the new facility.…”

Three decades of research using IGISOL technique at the University of Jyväskylä

“…Interestingly however, a local maximum in yield was found to exist at low skimmer voltage 112 Rh as a function of skimmer voltage (primary beam intensity indicated). The coupling of the beam cooler to the laser spectroscopy line proved to be immediately fruitful and one of the first measurements involved an investigation of the energy spread of the cooled beam, performed off-line using 138 Ba + ions. A compromise had to be reached between energy spread and ionic yield when doing laser spectroscopy (see Fig.…”

“…In the heavier mass region, proton or 3 He beams on a 92 Mo target could help in populating the low-spin isomers in 91 Tc and 93 Ru. 93 Pd could be produced at HIGISOL whereas for 94 Ag, a special hot cavity laser ion source has been developed [138]. In addition, a mass measurement of the waiting-point nucleus 80 Zr would be very interesting.…”