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Title: Observation of hyperfine mixing in measurements of a magnetic octupole decay in isotopically pure nickel-like 129Xe and 132Xe ions

Abstract

We present measurements of high statistical significance of the rate of the magnetic octupole (M3) decay in nickel-like ions of isotopically pure {sup 129}Xe and {sup 132}Xe. On {sup 132}Xe, an isotope with zero nuclear spin and therefore without hyperfine structure, the lifetime of the metastable level was established as (15.06 {+-} 0.24) ms. On {sup 129}Xe, an additional fast (2.7 {+-} 0.1 ms) decay component was established that represents hyperfine mixing with a level that decays by electric quadrupole (E2) radiation.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
972823
Report Number(s):
UCRL-JRNL-226985
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1001540
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters, vol. 98, no. 26, January 1, 2007, pp. 263001; Journal Volume: 98; Journal Issue: 26
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; DECAY; HYPERFINE STRUCTURE; LIFETIME; OCTUPOLES; QUADRUPOLES; SPIN

Citation Formats

Trabert, E, Beiersdorfer, P, and Brown, G V. Observation of hyperfine mixing in measurements of a magnetic octupole decay in isotopically pure nickel-like 129Xe and 132Xe ions. United States: N. p., 2006. Web.
Trabert, E, Beiersdorfer, P, & Brown, G V. Observation of hyperfine mixing in measurements of a magnetic octupole decay in isotopically pure nickel-like 129Xe and 132Xe ions. United States.
Trabert, E, Beiersdorfer, P, and Brown, G V. Thu . "Observation of hyperfine mixing in measurements of a magnetic octupole decay in isotopically pure nickel-like 129Xe and 132Xe ions". United States. doi:. https://www.osti.gov/servlets/purl/972823.
@article{osti_972823,
title = {Observation of hyperfine mixing in measurements of a magnetic octupole decay in isotopically pure nickel-like 129Xe and 132Xe ions},
author = {Trabert, E and Beiersdorfer, P and Brown, G V},
abstractNote = {We present measurements of high statistical significance of the rate of the magnetic octupole (M3) decay in nickel-like ions of isotopically pure {sup 129}Xe and {sup 132}Xe. On {sup 132}Xe, an isotope with zero nuclear spin and therefore without hyperfine structure, the lifetime of the metastable level was established as (15.06 {+-} 0.24) ms. On {sup 129}Xe, an additional fast (2.7 {+-} 0.1 ms) decay component was established that represents hyperfine mixing with a level that decays by electric quadrupole (E2) radiation.},
doi = {},
journal = {Physical Review Letters, vol. 98, no. 26, January 1, 2007, pp. 263001},
number = 26,
volume = 98,
place = {United States},
year = {Thu Dec 21 00:00:00 EST 2006},
month = {Thu Dec 21 00:00:00 EST 2006}
}
  • We present measurements of high statistical significance of the rate ofthe magnetic octupole (M3) decay in nickel-like ions of isotopically pure {sup 129}Xe and {sup 132}Xe. On {sup 132}Xe, an isotopewith zero nuclear spin and therefore without hyperfine structure, the lifetimeof the metastable level was established as (15.06{+-}0.24) ms. On {sup 129}Xe, an additionalfast (2.7{+-}0.1 ms) decay component was established that representshyperfine mixing with a level that decays by electric quadrupole (E2) radiation.
  • A microcalorimeter with event mode capability for time-resolved soft-x-ray spectroscopy, and a high-resolution flat-field EUV spectrometer have been employed at the Livermore EBIT-I electron beam ion trap for observations and wavelength measurements of M1, E2, and M3 decays of long-lived levels in the Ni-like ions Xe{sup 26+}, Cs{sup 27+}, and Ba{sup 28+}. Of particular interest is the lowest excited level, 3d{sup 9}4s {sup 3}D{sub 3}, which can only decay via a magnetic octupole (M3) transition. For this level in Xe an excitation energy of (590.40 {+-} 0.03eV) and a level lifetime of (11.5 {+-} 0.5 ms) have been determined.
  • A microcalorimeter with event mode capability for time-resolved soft-x-ray spectroscopy, and a high-resolution flat-field extreme ultraviolet spectrometer have been employed at the Livermore EBIT-I electron beam ion trap for observations and wavelength measurements of M1, E2, and M3 decays of long-lived levels in the Ni-like ions Xe{sup 26+}, Cs{sup 27+}, and Ba{sup 28+}. Of particular interest is the lowest excited level, 3d{sup 9}4s {sup 3}D{sub 3}, which can only decay via a magnetic octupole (M3) transition. For this level in Xe, an excitation energy of (590.40{+-}0.03 eV) and a level lifetime of (11.5{+-}0.5 ms) have been determined.
  • We report the first observation of magnetic octupole decay in the x-ray spectrum of a highly charged ion. Detailed analyses of the low-energy region of the {ital n}=3{r arrow}4 spectra of nickel-like Th{sup 62+} and U{sup 64+} show an intense line at 2558.7{plus minus}0.2 and 2689.3{plus minus}0.2 eV, respectively, that is attributed to the transition (3{ital d}{sup 9}4{ital s}){sub {ital J}=3}{r arrow}(3{ital d}{sup 10}){sub {ital J}=0}. Calculations indicate that the line is almost exclusively excited by indirect processes such as radiative cascades and electron capture.