H. K. Carter

A completely cold laser ion source for separators

Abstract A new type of laser ion source is proposed for the UNISOR isotope separator. Products from heavy-ion reactions are stopped in helium gas and transported to a cold collector. After a collection period, the sample is desorbed by a pulsed laser beam. A second laser ionizes the atoms of interest in the vapor cloud. The ions are extracted and sent through the separator. Recent analytical applications of resonant and nonresonant ionization indicate that a total efficiency of 1–10% should be achievable.

Application of collinear laser spectroscopy on fast atom beams to measure nuclear properties

Abstract A laser spectroscopy system has been developed to observe on-line the atomic hyperfine structure of nuclides produced by heavy-ion collisions and formed into a monoenergetic beam with an isotope separator. The system has been used to observe the hyperfine structure and isotope shifts of 189–194,201,203,205 Tl. We present here a brief description of the system and discuss its performance characteristics in these initial experiments.

The CARDS array for neutron-rich decay spectroscopy at HRIBF

An array for decay studies of neutron-rich nuclei has been commissioned for use at the UNISOR separator at Holifield Radioactive Ion Beam Facility. This array consists of three segmented clover Ge detectors, plastic scintillators, and a high-resolution (∼1 keV) Si conversion electron spectrometer. These detectors are mounted on a support that surrounds a moving tape collector. This system has been named clover array for radioactive decay studies. The detectors have been outfitted with digital flash ADCs (XIA DGFs) that fit the preamp signals, with built-in pileup rejection.

Very converted transitions and particle-core coupling in neutron-deficient odd-mass au isotopes

Levels in185, 187Au have been studied by radioactive decay of isotopically separated185, 187Hg. A number of low-energy very-converted transitions are observed in the decay. It is shown that the enhanced conversion in these cases comes from an E0 component rather than from an anomaly in theM1 conversion process. A systematic pattern of bands interconnected with these very converted transitions is presented as evidence for a new type of particle-core coupling in185, 187Au.

Sensitive Collinear Laser Spectroscopy On Fast Atom And Ion Beams

A fiber optic light collector has been constructed in order to efficiently guide photons from a long narrow source onto the face of a photomultiplier. We present here a brief review of the technique of collinear laser-fast atom beams and describe the performance of this new collector in such a collinear system.

Collective and noncollective states in Cd-116 studied via the beta decays of Ag-116m1, m2, gs

We have re-investigated the beta decay of the three isomers of

Non-yrast level structure of35Nd via beta decay of135Pm

^{116}

Decay of /sup 172/Hf to levels in /sup 172/Lu

Ag at the Holifield Radioactive Ion Beam Facility (HRIBF). Through the use of half-life information, we have been able to construct individual decay schemes for each isomer, and correct what was a puzzling inconsistency with the published data, namely the beta feeding of 2