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Title: 20 {mu}s isomeric state in doubly odd {sub 61}{sup 134}Pm

Abstract

Recoil-isomer tagging at the Accelerator Laboratory of the University of Jyvaeskylae has been used to establish the isomeric nature of a known (7{sup -}) excited state in the doubly odd nucleus {sup 134}Pm. The isomeric state was determined to have a half-life of 20(1) {mu}s and was populated from the decay of a {pi}h{sub 11/2} x {nu}h{sub 11/2} band using the {sup 92}Mo({sup 54}Fe,2{alpha}3pn) reaction at 305 and 315 MeV. The isomer decays by a 71-keV transition that provides an intermediate step in linking the established {sup 134}Pm high-spin level scheme to the lower-spin states observed from the {beta} decay of {sup 134}Sm. Electron-conversion analysis for the 71-keV {gamma}-ray transition reveals that it is of E1 character and its small reduced-transition probability suggests that {sup 134}Pm may have a nuclear shape more rigid than that of the neighboring nuclei.

Authors:
; ; ; ;  [1]; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Schuster Laboratory, University of Manchester, Manchester M13 9PL (United Kingdom)
  2. Department of Physics, University of Jyvaeskylae, Jyvaeskylae FIN-40014 (Finland) (and others)
Publication Date:
OSTI Identifier:
21290043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 80; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.80.024303; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ACCELERATORS; BETA DECAY; ELECTRONS; EXCITED STATES; GAMMA RADIATION; HALF-LIFE; IRON 54; ISOMERS; MEV RANGE 100-1000; MOLYBDENUM 92 TARGET; PROMETHIUM 134; RECOILS; SAMARIUM 134; SPIN

Citation Formats

Cullen, D. M., Mason, P. J. R, Rigby, S. V., Kishada, A. M., Varley, B. J., Scholey, C., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Leppaenen, A.-P., Maentyniemi, K., Nieminen, P., Nyman, M., and Pakarinen, J. 20 {mu}s isomeric state in doubly odd {sub 61}{sup 134}Pm. United States: N. p., 2009. Web. doi:10.1103/PHYSREVC.80.024303.
Cullen, D. M., Mason, P. J. R, Rigby, S. V., Kishada, A. M., Varley, B. J., Scholey, C., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Leppaenen, A.-P., Maentyniemi, K., Nieminen, P., Nyman, M., & Pakarinen, J. 20 {mu}s isomeric state in doubly odd {sub 61}{sup 134}Pm. United States. doi:10.1103/PHYSREVC.80.024303.
Cullen, D. M., Mason, P. J. R, Rigby, S. V., Kishada, A. M., Varley, B. J., Scholey, C., Eeckhaudt, S., Grahn, T., Greenlees, P. T., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Leppaenen, A.-P., Maentyniemi, K., Nieminen, P., Nyman, M., and Pakarinen, J. Sat . "20 {mu}s isomeric state in doubly odd {sub 61}{sup 134}Pm". United States. doi:10.1103/PHYSREVC.80.024303.
@article{osti_21290043,
title = {20 {mu}s isomeric state in doubly odd {sub 61}{sup 134}Pm},
author = {Cullen, D. M. and Mason, P. J. R and Rigby, S. V. and Kishada, A. M. and Varley, B. J. and Scholey, C. and Eeckhaudt, S. and Grahn, T. and Greenlees, P. T. and Jakobsson, U. and Jones, P. M. and Julin, R. and Juutinen, S. and Ketelhut, S. and Leino, M. and Leppaenen, A.-P. and Maentyniemi, K. and Nieminen, P. and Nyman, M. and Pakarinen, J.},
abstractNote = {Recoil-isomer tagging at the Accelerator Laboratory of the University of Jyvaeskylae has been used to establish the isomeric nature of a known (7{sup -}) excited state in the doubly odd nucleus {sup 134}Pm. The isomeric state was determined to have a half-life of 20(1) {mu}s and was populated from the decay of a {pi}h{sub 11/2} x {nu}h{sub 11/2} band using the {sup 92}Mo({sup 54}Fe,2{alpha}3pn) reaction at 305 and 315 MeV. The isomer decays by a 71-keV transition that provides an intermediate step in linking the established {sup 134}Pm high-spin level scheme to the lower-spin states observed from the {beta} decay of {sup 134}Sm. Electron-conversion analysis for the 71-keV {gamma}-ray transition reveals that it is of E1 character and its small reduced-transition probability suggests that {sup 134}Pm may have a nuclear shape more rigid than that of the neighboring nuclei.},
doi = {10.1103/PHYSREVC.80.024303},
journal = {Physical Review. C, Nuclear Physics},
number = 2,
volume = 80,
place = {United States},
year = {Sat Aug 15 00:00:00 EDT 2009},
month = {Sat Aug 15 00:00:00 EDT 2009}
}
  • The level structures of the doubly-odd nuclei /sup 136/Pm and /sup 134/Pr have been studied to high spin following the reactions /sup 114/Cd(/sup 27/Al,5n)/sup 136/Pm, /sup 116/Sn(/sup 24/Mg,p3n)/sup 136/Pm, and /sup 114/Cd(/sup 27/Al,..cap alpha..3n)/sup 134/Pr. The two nuclei show very similar collective features. In both nuclei a rotational band built on the ..pi..h/sub 11/2/x..nu..h/sub 11/2/ configuration has been observed. This band shows a constant signature splitting of approx.50 keV with no backbend in both cases. In addition, a sideband built on the ..pi..(413)(5/2/sup +/x..nu..h/sub 11/2/ configuration has been observed in /sup 136/Pm. This band becomes yrast at high spins andmore » shows a gain in alignment of approx.8h-dash-bar at a frequency of h-dash-bar..omega..approx.0.28 MeV due to the decoupling of a pair of h/sub 11/2/ protons. In /sup 134/Pr the sideband was only observed above the band crossing. Experimental ratios of reduced transition probabilities, B(M1)/B(E2), have been extracted from transitions within the bands and compared to theoretical values obtained from a semiclassical model.« less
  • Recoil-isomer tagging with the {sup 54}Fe+{sup 92}Mo reaction was used to establish a 10(2)-{mu}s isomeric state in {sup 139}Eu. Prompt versus delayed {gamma}-ray coincidence data have revealed the presence of a prompt rotational band built upon the isomer. The alignment properties of the states in this band show that the isomer is based upon a proton g{sub 7/2} configuration. The decay of the isomer takes place through a single 26-keV E1 transition. The {gamma}-ray transition strength for this decay is consistent with those established in the neighboring isomeric gamma-soft nuclei. In these nuclei, isomers are expected to form as amore » consequence of differences in nuclear shapes or configurations, and the natural hindrance associated with configuration-changing E1 transitions. The isomeric nature of the state in {sup 139}Eu is reasoned to be because of difference in shape of the proton g{sub 7/2} state and the proton h{sub 11/2} ground state to which it decays.« less
  • A high yield route (80-90%) to the bridging dinitrogen complex (WCp{sup *}Me{sub 3}){sub 2}({mu}-N{sub 2}) (1) consists of the reduction of WCp{sup *}Me{sub 3}(OTf) by sodium amalgam in the presence of dinitrogen. 1 reacts with HOTf (2 or excess (6) equiv) to give (WCp{sup *}Me{sub 2}(OTf)){sub 2}({mu}-N{sub 2}) or (WCp{sup *}Me(OTf){sub 2}){sub 2}({mu}-N{sub 2}), respectively, with C{sub 6}F{sub 5}COOH, C{sub 6}F{sub 5}OH, or C{sub 6}F{sub 5}SH to give complexes of the form (WCp{sup *}Me{sub 2}(X)){sub 2}({mu}-N{sub 2}) (X = OC{sub 6}F{sub 5}, etc.), and with tetrabromocatechol to give (WCp{sup *}Me(O{sub 2}C{sub 6}Br{sub 4})){sub 2}({mu}-N{sub 2}). (WCp{sup *}Me{sub 2}(OTf)){sub 2}({mu}-N{sub 2})more » reacts with NaSR (R = 2,4,6-C{sub 6}H{sub 2}Me{sub 3} or 2,4,6-C{sub 6}H{sub 2}-i-Pr{sub 3}) to give complexes of the form (WCp{sup *}Me{sub 2}(SR)){sub 2}({mu}-N{sub 2}), and (WCp{sup *}Me(OTf){sub 2}){sub 2}({mu}-N{sub 2}) and (WCp{sup *}Me{sub 2}(S-2,4,6-C{sub 6}H{sub 2}Me{sub 3})){sub 2}({mu}-N{sub 2}) show that the complexes have structures that are similar to that of 1, except the N-N bond lengths are shorter.« less
  • The reaction of Os{sub 4}(CO){sub 12}({mu}{sub 3}-S) (1) with MeC{sub 2}NMe{sub 2} yielded the complexes Os{sub 3}(CO){sub 9}({mu}{sub 3}-MeC{sub 2}NMe{sub 2})({mu}{sub 3}-S) (2), Os{sub 4}(CO){sub 11}({mu}{sub 3}-MeC{sub 2}NMe{sub 2})({mu}-MeC{sub 2}NMe{sub 2})({mu}{sub 3}-S) (3), Os{sub 4}(CO){sub 11}({mu}-C(Me)C(NMe{sub 2})C(NMe{sub 2})CMe)({mu}{sub 3}-S) (4), Os{sub 4}(CO){sub 11}({mu}-C(NMe{sub 2})C(Me)C(Me)C(NMe{sub 2}))({mu}{sub 3}-S) (5), Os{sub 4}(CO){sub 9}({mu}-MeC{sub 2}NMe{sub 2})({mu}-C(Me)C(NMe{sub 2})C(Me)C(NMe{sub 2}))({mu}{sub 3}-S) (6), and Os{sub 3}(CO){sub 7}({mu}{sub 3}-MeC{sub 2}NMe{sub 2})({mu}-MeC{sub 2}NMe{sub 2})({mu}{sub 3}-S) (7), all in low yields. Compounds 3-7 are new and have been characterized by Ir, {sup 1}H NMR, and single-crystal X-ray diffraction analyses. Compound 3 contains a chain of four osmium atoms with twomore » bridging ynamine ligands and a bridging sulfido ligand. Both ynamine ligands contain strong {pi}-bonding interactions between the NMe{sub 2} groups and the neighboring carbon atom in the alkynyl groups. These interactions alter the metal-carbon bonding, and the ynamine ligands adopt structures that resemble aminocarbene ligands. Similar structures were found for the ynamine ligands in 7. Compounds 4-6 contain spiked triangular clusters of four osmium atoms with a triply bridging sulfido ligand on the triangular grouping. Each of these compounds also contains a metallacyclopentadiene group formed by the coupling of two ynamine ligands. In each compound, the two ynamine ligands have been coupled in a different way. In 4, they were coupled tail to tail. In 5 they were coupled head to head, and in 6 they were coupled head to tail. There is structural evidence for significant, albeit weaker, {pi}-bonding interactions between the amino groups and the adjacent carbon atoms in these complexes. This seems to produce a weakening of the corresponding metal-carbon bonding.« less
  • Reaction of SO{sub 2} with solutions of Cp*{sub 2}Mo{sub 2}({mu}-S{sub 2})({mu}-S){sub 2} (1) initially yields 1-SO{sub 2}, which is shown by crystallography to contain an SO{sub 2} weakly bound to a {mu}-S (S-S = 2.60 {angstrom}). SO{sub 2} further reacts with 1-SO{sub 2} to quantitatively give Cp*{sub 2}Mo{sub 2{minus}} ({mu}-S{sub 2})({mu}-S)({mu}-SSO{sub 3}) (2), which now contains an SO{sub 3} bound to the {mu}-S (S-S = 2.17 {angstrom}). Effectively, a {mu}-S{sub 2}O{sub 3} (thiosulfate) ligand is formed by an oxygen-transfer process, and the source of the oxygen as established by {sup 18}O labeling is SO{sub 2}. S{sub 8} is also produced,more » showing that SO{sub 2} has undergone net disproportionation to SO{sub 3} and S{sub 8}.« less