Resonant Ionization Laser Ion Source (RILIS) off-line developments on Ga, Al and Ca

The 3He long-counter TETRA at the ALTO ISOL facility

“…Ions of Ga +1 were extracted with the Resonant Ionization Laser Ion Source (RILIS) using two-step ionization scheme [12] at 30-keV energy towards the online isotope separator PARRNe [13]. The pure beam was then transmitted to the BEDO station.…”

Polarization-dependent laser resonance ionization of beryllium

“…Due to the polarization relaxation by collisions with environmental atoms, the reported studies of this effect were typically performed on low-density media such as atomic beams [1][2][3][4][5][6][7][8][9], instead of a confined and hot environment like a hot-cavity laser ion source. Initially motivated by the observation of polarization dependence of beryllium (Be) ion yields during online radioactive beam delivery at TRIUMF's isotope separator and accelerator facility (ISAC), a systematic investigation of this effect was performed at the off-line laser ion source test stand (LIS-STAND) [10,11] with atoms in a hot-cavity environment.…”

“…Laser ionized Be radioactive ion beams are in high demand at ISAC: 7 Be proton capture is the key process to understand the solar neutrino deficit; 11 Be is the simplest halo nucleus with only one halo neutron; the neutron-rich nucleus 14 Be with two halo neutrons is a loosely bound state of three bodies, similar to 11 Li but has its special characteristics. High ionization efficiency will help to extract 14 Be beams in measurable quantities for experiments.…”

“…In addition, It is interesting for trace analytical studies measuring the small abundance of long live radioisotope 11 Be in geological samples. The preferred ionization scheme for beryllium using Ti:Sa lasers is 2s 2 1 S 0 → 2s2p 1 P • 1 → 2p 2 1 S 0 , which strongly depends on the polarizations of the exciting laser light theoretically when polarization relaxation is absent.…”

Mass measurements of neutron-rich gallium isotopes refine production of nuclei of the first r -process abundance peak in neutron-star merger calculations

“…Neutron-rich Ga isotopes were produced by a ≈ 480 MeV, 10 µA proton beam impinging on a UC x target [47] at the Isotope Separator and ACcelerator (ISAC) facility [48]. TRIUMF's Ion Guide Laser Ion Source (IGLIS) [49] was used to suppress surface-ionized contaminants by a factor of 10 5 − 10 6 and resonantly laser ionizes the Ga isotopes of interest [50]. The continuous, mass-separated, beam was accumulated, cooled and bunched in TITAN's Radio Frequency Quadrupole (RFQ) cooler-buncher [51] and ion bunches were sent to TITAN's Multiple-Reflection Time of Flight Mass-Spectrometer and isobar separator (MR-TOF-MS) [52], capable of performing mass measurements of low count rate species with relative uncertainties in the δm/m ∼ 10 −7 range [53,54].…”