Wedge-shaped SmCo5 magnets for mini-orange spectrometers

Klinken, J. van; Feenstra, S.J.; Dumont, G.

doi:10.1016/0029-554x(78)90152-0

Cited by 54 publications

(23 citation statements)

References 3 publications

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“…Set-up III had a 9% Ge(i) 7-X detector close to the source and, on the other side of the transport tape, a mini-orange electron spectrometer [18]. The latter will be described in detail elsewhere [19].…”

Section: Detector Configurations and Measurementsmentioning

confidence: 99%

The Gamow-Teller beta decay of neutron-deficient even isotopes of tin

Barden

Kirchner

Klepper

et al. 1988

Z. Physik A - Atomic Nuclei

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With the use of the 58Ni+S~ fusion-evaporation reaction and chemically selective on-line mass separation, the EC//3 + decay of t~ was studied by ?-ray and conversionelectron spectroscopy. In the course of these studies, a new 15.7-s isomeric state of t~ was observed. Reinvestigation of the {/-decays of the two heavier even isotopes of tin, produced in the s 8Ni + 58Ni reaction and mass separated without chemical discrimination, brought new information on the decay of l~ and ~~ The QEc values of 1~ l~ and 1~ were determined to be 4550 +300 keV, 3200+100 keV and -250 <2270 keV, respectively. In the data analysis, the emphasis is put on the identification of the 0+-~ 1 + Gamow-Teller /~ transitions and determination of their strengths. For 1~176 the total Gamow-Teller strengths are measured to be 20% to 30% of that predicted by the single-particle shell model with the inclusion of pairing correlations and core polarization. Predictions of the decay properties of the as yet unobserved ~~ and l~176 are made. 23.40.Hc; 21.10.Dr; 21.10.Pc; 27.60. +j; 29.30.Kv PACS: IntroductionThis paper presents a reinvestigation of the 104, 106,1088n EC/fl+ decays carried out at the GSI mass separator on-line to the UNILAC with the application of nuclear spectroscopy techniques. In the data analysis, the emphasis is put on the identification of the 0+~ 1 + Gamow-Teller (GT) transitions and determination of their strengths. The observation of more than one GT transition in each of the three decays, and the origin of quenching of the summed GT strengths compared to prediction of the extremesingle-particle shell model (ESPSM) are discussed with reference to theoretical studies [1][2][3].The main new results are those obtained for A = 104. Compared to our preceding investigation of the isotope ~~ [4,5] (see also the Leuven results * This work is part of the Ph.D. thesis of G.-E. Rathke[6]), an essential progress in studying its decay properties has been achieved due to the application of a mass-separator ion source [7,8] which allows for a substantial suppression of the isobaric contamination. Also the application of a mini-orange spectrometer [-9] for measuring the spectra of internal-conversion electrons appeared to be a very important addition to our 7-ray studies. As a result, the l~ --+ 1~ decay scheme is constructed with four wellestablished GT transitions.Four GT transitions (two of which were not reported in [10,11]) have also been observed in the 1~ decay. The previous version of the 1~ decay scheme [12, 13] has essentially been confirmed with respect to GT strength. Finally, the results of the present work have been extrapolated to get an estimate of the decay properties for the yet unobserved isotopes 1~and doubly magic l~176

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Section: Detector Configurations and Measurementsmentioning

confidence: 99%

The Gamow-Teller beta decay of neutron-deficient even isotopes of tin

Barden

Kirchner

Klepper

et al. 1988

Z. Physik A - Atomic Nuclei

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“…In Orange-type spectrometers [30] the coils create and confine typical Unauthenticated Download Date | 6/13/16 9:19 AM 1/r-fields in which the electrons follow cycloidal paths. In Mini-Orange filters [31] wedge-shaped permanent magnets also span fields of roughly toroidal symmetry, but their field strengths are more or less constant in r. Fairly homogenous fields can also be prepared in large-scale toroidal arrangements [32] by adapted distributions of the current loops within the planes of individual coils. Devices designed in such a way combine rotational symmetry and large acceptance with the advantages of homogenous field distributions.…”

Section: A Toroidal Fieldsmentioning

confidence: 98%

“…It is possible to generate toroidal fields in small volumes with wedge-shaped permanent magnets [31]. Modern magnets made of Nd 2 Fe 14 B induce field strengths of 1.1 Τ or even 1.3 T. The Mini-Orange or MOr is not itself intended as a spectrometer, but rather acts as a transport field with broad transmission width (up to AE/E > 0.5), with appreciated cut-off of lower energies and with very effective rejection of positrons when observing electrons and of, vice versa, electrons when observing positrons.…”

Section: Mini-orange Spectrometer Familymentioning

confidence: 99%

“…We restrict ourselves to devices based on toroidal magnetic fields either in form of a focussing instrument like the Orange-type ß-spectrometer [30] or in form of a wideband Mini-Orange device [31]. The axis of the toroidal field usually points to the target spot, providing for largest collection efficiencies in that position.…”

Section: B Dispersive Spectrometer Devicesmentioning

confidence: 99%

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6 Modern Electron and Positron Spectrometers – Selected Aspects of a Broad Field

Bokemeyer¹,

Klinken²,

Salabura³

1997

Experimental Techniques in Nuclear Physics

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“…A new type of spectrometer for conversion electron consisting of a Si detector and a filter of permanent magnets around a central absorber of lead or tungsten has been created by Klinken J V et al in 1972 [1]. This new type of Mini-Orange spectrometer (MOS) [1][2][3][4] meet the requirements for in-beam measuring conversion electrons due to its advantages of wide energy range, high transmission efficiency, high energy resolution, and easy operation. The MOS has been constructed for a long time and used to measure conversion electrons [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Mini-orange spectrometer at CIAE

Zheng¹,

Wu²,

Li³

et al. 2016

Chinese Phys. C

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A Mini-Orange spectrometer used for in-beam measurements of internal conversion electrons, which consists of a Si(Li) detector and different sets of SmO5 permanent magnets for filtering and transporting the conversion electrons to the Si(Li) detector, has been developed at China Institute of Atomic Energy. The working principle and configuration of the Mini-Orange spectrometer are described. The performance of the setup is illustrated by measured singles conversion electron spectra using the Mini-Orange spectrometer.

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Wedge-shaped SmCo5 magnets for mini-orange spectrometers

Cited by 54 publications

References 3 publications

The Gamow-Teller beta decay of neutron-deficient even isotopes of tin

The Gamow-Teller beta decay of neutron-deficient even isotopes of tin

6 Modern Electron and Positron Spectrometers – Selected Aspects of a Broad Field

Mini-orange spectrometer at CIAE

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