Low-lying levels In 4in and a problem of spin-mixing in hyperfine fields

J. Szerypo; R. Barden; Kalinowski; R. Kirchner; O. Klepper; A. Płochocki; E. Roeckl; K. Rykaczewski; D. Schardt; J. Zylicz

doi:10.1016/0375-9474(90)90297-Y

Low-lying levels In ⁴in and a problem of spin-mixing in hyperfine fields

J. Szerypo, R. Barden, Kalinowski, R. Kirchner, O. Klepper, A. Płochocki, E. Roeckl, K. Rykaczewski, D. Schardt, J. Zylicz

Nuclear Structure and Nuclear Astrophysi

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

The 16-s ^104mIn and 21-s ¹⁰⁴Sn activities were produced at GSI in the ⁵⁸Ni + ⁵⁰Cr reaction. On-line chemical- and mass-separation was applied to prepare samples of these activities for accurate γ-ray and conversion-electron spectroscopy. The energy difference ΔE = 290 ± 20 eV and the spin difference gDI = 2 between the 93.5 keV isomeric and 93.2 keV short-lived levels of ¹⁰⁴In were established. Tentative spin-parity assignments are 3⁺ for the 93.5 keV and 5⁺ for the 93.2 keV state. An estimate is given for the amount of mixing of these two states if they are exposed to a gradient of a hyperfine electric field. The chance of detecting such mixing via its influence upon the half-life of the isomeric state is discussed, and shown to be very small. For comparison, this discussion includes also the mixing that would occur in the case of a magnetic field if the spin difference were ΔI = 1.

Original language	English
Pages (from-to)	357-370
Number of pages	14
Journal	Nuclear Physics A
Volume	507
Issue number	2
DOIs	https://doi.org/10.1016/0375-9474(90)90297-Y
State	Published - Feb 5 1990

Funding

The authors are grateful to C. Bruske, K. Burkard and W. Hiiller for operating the on-line separator. The Warsaw group would like to thank GSI for making the participation in the experiment possible. This work is partially supported by the Polish Ministry of National Education under the Project CPBP 01.09.

Keywords

RADIOACTIVITY

Access to Document

10.1016/0375-9474(90)90297-Y

Cite this

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title = "Low-lying levels In 4in and a problem of spin-mixing in hyperfine fields",

abstract = "The 16-s 104mIn and 21-s 104Sn activities were produced at GSI in the 58Ni + 50Cr reaction. On-line chemical- and mass-separation was applied to prepare samples of these activities for accurate γ-ray and conversion-electron spectroscopy. The energy difference ΔE = 290 ± 20 eV and the spin difference gDI = 2 between the 93.5 keV isomeric and 93.2 keV short-lived levels of 104In were established. Tentative spin-parity assignments are 3+ for the 93.5 keV and 5+ for the 93.2 keV state. An estimate is given for the amount of mixing of these two states if they are exposed to a gradient of a hyperfine electric field. The chance of detecting such mixing via its influence upon the half-life of the isomeric state is discussed, and shown to be very small. For comparison, this discussion includes also the mixing that would occur in the case of a magnetic field if the spin difference were ΔI = 1.",

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T1 - Low-lying levels In 4in and a problem of spin-mixing in hyperfine fields

AU - Szerypo, J.

AU - Barden, R.

AU - Kalinowski,

AU - Kirchner, R.

AU - Klepper, O.

AU - Płochocki, A.

AU - Roeckl, E.

AU - Rykaczewski, K.

AU - Schardt, D.

AU - Zylicz, J.

PY - 1990/2/5

Y1 - 1990/2/5

N2 - The 16-s 104mIn and 21-s 104Sn activities were produced at GSI in the 58Ni + 50Cr reaction. On-line chemical- and mass-separation was applied to prepare samples of these activities for accurate γ-ray and conversion-electron spectroscopy. The energy difference ΔE = 290 ± 20 eV and the spin difference gDI = 2 between the 93.5 keV isomeric and 93.2 keV short-lived levels of 104In were established. Tentative spin-parity assignments are 3+ for the 93.5 keV and 5+ for the 93.2 keV state. An estimate is given for the amount of mixing of these two states if they are exposed to a gradient of a hyperfine electric field. The chance of detecting such mixing via its influence upon the half-life of the isomeric state is discussed, and shown to be very small. For comparison, this discussion includes also the mixing that would occur in the case of a magnetic field if the spin difference were ΔI = 1.

AB - The 16-s 104mIn and 21-s 104Sn activities were produced at GSI in the 58Ni + 50Cr reaction. On-line chemical- and mass-separation was applied to prepare samples of these activities for accurate γ-ray and conversion-electron spectroscopy. The energy difference ΔE = 290 ± 20 eV and the spin difference gDI = 2 between the 93.5 keV isomeric and 93.2 keV short-lived levels of 104In were established. Tentative spin-parity assignments are 3+ for the 93.5 keV and 5+ for the 93.2 keV state. An estimate is given for the amount of mixing of these two states if they are exposed to a gradient of a hyperfine electric field. The chance of detecting such mixing via its influence upon the half-life of the isomeric state is discussed, and shown to be very small. For comparison, this discussion includes also the mixing that would occur in the case of a magnetic field if the spin difference were ΔI = 1.

KW - RADIOACTIVITY

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