A new concept for a compact tape transport system

doi:10.1016/0029-554X(81)90911-3

Nuclear Instruments and Methods in Physics Research

Volume 186, Issues 1–2, 1 July 1981, Pages 239-241

https://doi.org/10.1016/0029-554X(81)90911-3 Get rights and content

Abstract

A new concept in tape transport systems for the collection and counting of radioactive samples from an on-line isotope separator has been developed. This new compact design was motivated by space limitations but important additional improvements over previous designs were made in cost, simplicity and vacuum quality. The system is based on a continuous loop of 6.5 mm wide recording tape 116 m long with a conducting coating on one side for beam current monitoring. One small stepping motor is required for operation.

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E.H. Spejewski
E.H. Spejewski

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TATRA: A versatile high-vacuum tape transportation system for decay studies at radioactive-ion beam facilities
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Citation Excerpt :
The system is based on the concept of an endless loop that originates from historical 8-track cartridges, used in the past for sound and video recording. Previously, this concept was widely and successfully used at the UNISOR facility at the Oak Ridge National Laboratory [7], where it produced many important results, see, e.g., [8–12] and references therein. The endless loop of the tape is carried by a single reel.
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A tape-transport system for removing long-lived decay products has been incorporated into the design of the second β-detection chamber. SATURN (Scintillator And Tape Using Radioactive Nuclei) is largely based upon a Louisiana State University design [4] that makes use of a continuous loop of tape, and an initial test station that is located on one of the CARIBU low-energy beamlines. The primary focus of our research with this apparatus is intended to be with short-lived activities, such as in the 132Sn region, with half-lives of the order of a second or less.
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A high-intensity thin-target He-jet production source
1997, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
A thin-target He-jet system suited to the production and rapid transport of nonvolatile radioactive species has been successfully operated with proton beam intensities of up to 700 μA. The system consists of a water-cooled, thin-target chamber, capillary gas transport system, moving tape/Ge detection system, and an aerosol generator/gas recirculator. The yields for a wide variety of uranium fission and deep spallation products have been measured and robust operation of the system demonstrated for several weeks. He-jet transport and collection efficiencies ranged between 15 and 25% with collection rates of 10⁷ to 10⁸ atoms/s/isotope. The high-intensity, thin-target He-jet approach represents a robust production source for nonvolatile radioactive heavy-ion beams.
The decays of mass-separated 133m,gNd to 133Pr
1995, Nuclear Physics, Section A
The decay of $^{133m} Nd (J^{π} = 12^{+})$ and $^{133g} Nd (J^{π} = 72^{+})$ to ¹³³Pr have been studied with mass-separated sources from the UNISOR facility. Multiscaled spectra of γ-rays, X-rays, and conversion electrons, as well as γγt, γXt, eγt, and eXt coincidences were obtained. A decay scheme for ^133gNd has been constructed consisting of 49 excited states and 153 transitions in ¹³³Pr. The β decay of the isomer, $^{133m} Nd (J^{π} = 12^{+})$ , is reported for the first time. A decay scheme has been constructed with 13 excited states and 26 transitions in ¹³³Pr. This isomer decays predominantly by an allowed β decay to an excited state at 402.8 keV in ¹³³Pr. The low-energy structure of ¹³³Pr is discussed in terms of the particle-plus-triaxial-rotor model and the onset of deformation in the region bounded by Z ⩾ 58, N ⩽ 76. The $π[411] 32$ configuration is suggested as the ground state of ¹³³Pr, and a low-lying $π[413] 52$ bandhead is also proposed.
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1995, Nuclear Physics, Section A
The decay of ¹³³Pm to ¹³³Nd has been studied with mass-separated sources from the UNISOR facility. Multiscaled spectra of γ-rays, X-rays, and conversion electrons, as well as γγt-, Xγt-, eγt-, and eXt-coincidences were obtained. The half life of ¹³³Pm was measured to be 15±3 s. A decay scheme has been constructed consisting of 51 excited states and 106 transitions in ¹³³Nd. Isomers decaying by M3 and E1 transitions are established in ¹³³Nd. The low-lying levels are discussed in terms of the particle-plus-triaxial-rotor model and the onset of deformation in the region bounded by Z ⩾ 58, N ⩽ 76.
Decay of mass-separated 3.0 min 195gBi to levels in 195Pb and shape coexistence in the neutron-deficient odd-mass Pb isotopes
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The radioactive decay of mass-separated 3.0 m ^195gBi to ¹⁹⁵Pb has been studied with the UNISOR and LISOL facilities. Time-sequenced spectra of γ-rays, X-rays, and conversion electrons have been obtained, together with γγt, γXt, eγt, and eXt coincidence data. From this information, a decay scheme has been constructed consisting of 23 excited states and 34 transitions in ¹⁹⁵Pb. Transitions with E0 multipole admixtures, indicative of shape coexistence, have been found to de-excite positive-parity levels at 1093, 1329, and 1380 keV. The beta-decay energy of the ¹⁹⁵Bi ground state is deduced to be Q_EC = 4800₋₅₅₀⁺⁶⁰⁰ keV based on the measurement of γ-ray-gated K/β⁺ ratios. The excitation energy of the $i_{132}$ isomer in ¹⁹⁵Pb has been determined to be 203±4 keV from the α-decays of ^199m,gPo.

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^∗: UNISOR is a consortium of 13 institutions and is supported by them and the US Department of Energy under Contract No. DE-AC05-760R00033.

^∗∗: Supported by the US Department of Energy under Contract No. DE-AS05-76ER0-4935.

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Nuclear Instruments and Methods in Physics Research

Abstract

References (5)

Cited by (19)

TATRA: A versatile high-vacuum tape transportation system for decay studies at radioactive-ion beam facilities

The X-Array and SATURN: A new decay-spectroscopy station for CARIBU

A high-intensity thin-target He-jet production source

The decays of mass-separated <sup>133m,g</sup>Nd to <sup>133</sup>Pr

The decay of <sup>133</sup>Pm and the structure of <sup>133</sup>Nd

Decay of mass-separated 3.0 min <sup>195g</sup>Bi to levels in <sup>195</sup>Pb and shape coexistence in the neutron-deficient odd-mass Pb isotopes