Application of a high efficiency selective laser ion source at the IRIS facility

Alkhazov, G.; Batist, L.; Быков, А. А.; Vitman, V.D.; Letokhov, V. S.; Mishin, V. I.; Panteleyev, V.N.; Sekatsky, S. K.; Fedoseyev, V. N.

doi:10.1016/0168-9002(91)90348-t

Cited by 38 publications

(16 citation statements)

References 2 publications

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“…67J.~U ground state has a rather pure (~hu/2)u/2 configuration [20], and its //-decay can be viewed as a superposition of the decays of the two below-lying N = 82 isotones 147Th65--~, which has one ~rh11/2 valence particle, and [5], T~/a 049HoH/2) = 20.5(5) (present work) b The decay strengths quoted here were recalculated from the tabulated [23] feeding intensities using the Qnc and T~/2 values quoted above in footnote ~ ~ Menegazzo et al [8,9]. ~ All states above 2 MeV, ~2 all states below 2 MeV d Kleinheinz et al [21].…”

Section: Beta Decay Resultsmentioning

confidence: 99%

“…As is apparent from Table 4 the TGA data give appreciable excess strength for 149Ho compared to the strength sum of 147Tb and 148Dy. We note, however, that raising the upper integration limit in 147Gd by only 36 keV would increase the sum from 1.03 to 1.17 units [23], quite close to the 1.20 units of 149Ho decay.…”

Section: ~_ 20 Proton)mentioning

confidence: 90%

“…It is interesting to compare our results with a strength function study [23] using total y-ray absorption spectroscopy (TGA) which principally is sensitive to the total strength irrespective of the feeding intensity for an individual state. In Fig.…”

Section: ~_ 20 Proton)mentioning

confidence: 94%

“…Below, these data are folded (smooth line) with a Gaussian of / Ex \1/2 FWHM=t9.8X~gv) keV, similar to the energy resolution of the total 7-ray absorption measurements (TGA). The energy bin of 28.5 keV is from [23]. The bottom figure presents the Box-values in a similar manner.…”

Section: ~_ 20 Proton)mentioning

confidence: 97%

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TheN=83 nucleus149Dy from Gamow-Teller decay of its 11/2? and 1/2+ 149Ho parents

Menegazzo

Kleinheinz

Collatz

et al. 1994

Z. Physik A - Hadrons and Nuclei

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Abstract. A high-sensitivity 7-spectroscopic study of the 149Ho zchH/2 and z~s~/2 l-decays using mass separated sources has located dominant 0+---,1 + GT decay strength associated with decay of paired h**/2 protons, leading to 3 qp-states in the 149Dy daughter nucleus. In their y-decay low-lying 149Dy levels characteristic of an N= 83 nucleus are excited. They include the v f7~2, vp3/2, vh92 and vp~2 single particle-and the vs -1 and vd -1 / / 1/2 3/2 two-particle one-hole states, as well as the vf7/2 x 3-and vf7/2 x 2 + particle-phonon multiplets. A synopsis is given of these excitations in the N = 83 isotones from raNd to ~53yb. The 149Dy GT decay strength is discussed in terms of the 147Tb82 and 148Dy82 decays. The strength function results are also compared with independent 149Ho 11/2-decay data from the literature based on total y-ray absorption measurements.

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Section: Beta Decay Resultsmentioning

confidence: 99%

Section: ~_ 20 Proton)mentioning

confidence: 90%

Section: ~_ 20 Proton)mentioning

confidence: 94%

Section: ~_ 20 Proton)mentioning

confidence: 97%

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TheN=83 nucleus149Dy from Gamow-Teller decay of its 11/2? and 1/2+ 149Ho parents

Menegazzo

Kleinheinz

Collatz

et al. 1994

Z. Physik A - Hadrons and Nuclei

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“…The first operational RILIS system was at the IRIS laboratory in PNPI, Gatchina, Russia. 6 Their system of recently modernized copper vapour pumped dye lasers is still in regular operation and set the format for the first RILIS installation at ISOLDE/CERN. 7 Several designs were tested and a summary of the development stages is given by Fedosseev et al 8 The ISOLDE RILIS has since become the most intensively used ion source of its type, with over 3000 h of operation in 2012 alone.…”

Section: Introductionmentioning

confidence: 99%

Resonance ionization laser ion sources for on-line isotope separators (invited)

Marsh

2014

Review of Scientific Instruments

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A Resonance Ionization Laser Ion Source (RILIS) is today considered an essential component of the majority of Isotope Separator On Line (ISOL) facilities; there are seven laser ion sources currently operational at ISOL facilities worldwide and several more are under development. The ionization mechanism is a highly element selective multi-step resonance photo-absorption process that requires a specifically tailored laser configuration for each chemical element. For some isotopes, isomer selective ionization may even be achieved by exploiting the differences in hyperfine structures of an atomic transition for different nuclear spin states. For many radioactive ion beam experiments, laser resonance ionization is the only means of achieving an acceptable level of beam purity without compromising isotope yield. Furthermore, by performing element selection at the location of the ion source, the propagation of unwanted radioactivity downstream of the target assembly is reduced. Whilst advances in laser technology have improved the performance and reliability of laser ion sources and broadened the range of suitable commercially available laser systems, many recent developments have focused rather on the laser/atom interaction region in the quest for increased selectivity and/or improved spectral resolution. Much of the progress in this area has been achieved by decoupling the laser ionization from competing ionization processes through the use of a laser/atom interaction region that is physically separated from the target chamber. A new application of gas catcher laser ion source technology promises to expand the capabilities of projectile fragmentation facilities through the conversion of otherwise discarded reaction fragments into high-purity low-energy ion beams. A summary of recent RILIS developments and the current status of laser ion sources worldwide is presented.

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