Spectroscopic investigation of 164,168Ta, 166,W and 164,165Hf

Hild, T.; Schmidt‐Ott, W. D.; Freystein, V.; Meißner, F.; Runte, E.; Salewski, H.; Michaelsen, R.

doi:10.1016/0375-9474(89)90084-5

Cited by 36 publications

(22 citation statements)

References 16 publications

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“…This half-life is a little bit shorter than but still in general agreement with the ones reported in [66][67][68][69], but clearly different from the ones from [70,71].…”

Section: Measurement Of the Half-life Of 165 Hfsupporting

confidence: 83%

“…In most works a half-life of about 75 s has been measured: (76 ± 4 s) [66], (78.6 ± 1.0 s) [67], (75 ± 3 s) [68], (1.28 ± 0.07 min) [69], while others report a significantly longer half-life of about 100 s: (1.7 ± 0.1 min) [70,71]. We have therefore measured the half-life of 165 Hf using the reaction 120 Sn( 50 Ti, 5n) 165 Hf at a beam energy of 223.9 MeV in the center of target #4 (300 μg/cm 2 thickness).…”

Section: Measurement Of the Half-life Of 165 Hfmentioning

confidence: 99%

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Gas chemical investigation of hafnium and zirconium complexes with hexafluoroacetylacetone using preseparated short-lived radioisotopes

Düllmann

Gregorich²,

Pang

et al. 2009

Radiochimica Acta

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Zirconium / Hafnium / Hexafluoroacetylacetonates / Thermochromatography / Isothermal gas chromatogaphy / Physical preseparation Summary. Volatile metal complexes of the group 4 elements Zr and Hf with hexafluoroacetylacetonate (hfa) have been studied using short-lived radioisotopes of the metals. The new technique of physical preseparation has been employed where reaction products from heavy-ion induced fusion reactions are isolated in a physical recoil separator -the Berkeley Gas-filled Separator in our work -and made available for chemistry experiments. Formation and decomposition of M(hfa) 4 (M = Zr, Hf) has been observed and the interaction strength with a fluorinated ethylene propylene (FEP) Teflon surface has been studied. From the results of isothermal chromatography experiments, an adsorption enthalpy of −ΔH a = (57 ± 3) kJ/mol was deduced. In optimization experiments, the time for formation of the complex and its transport to a counting setup installed outside of the irradiation cave was minimized and values of roughly one minute have been reached. The half-life of 165 Hf , for which conflicting values appear in the literature, was measured to be (73.9 ± 0.8) s. Provided that samples suitable for α-spectroscopy can be prepared, the investigation of rutherfordium (Rf), the transactinide member of group 4, appears possible. In the future, based on the studies presented here, it appears possible to investigate short-lived single atoms produced with low rates (e.g., transactinide isotopes) in completely new chemical systems, e.g., as metal complexes with organic ligands as used here or as organometallic compounds.

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“…This half-life is a little bit shorter than but still in general agreement with the ones reported in [66][67][68][69], but clearly different from the ones from [70,71].…”

Section: Measurement Of the Half-life Of 165 Hfsupporting

confidence: 83%

Section: Measurement Of the Half-life Of 165 Hfmentioning

confidence: 99%

Gas chemical investigation of hafnium and zirconium complexes with hexafluoroacetylacetone using preseparated short-lived radioisotopes

Düllmann

Gregorich²,

Pang

et al. 2009

Radiochimica Acta

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“…The trend of the production ratio is similar to that of 94keV or ll0keV v-rays, both belonging to t'6vW [4]. We note that the excitation function of 5.26 MeV e-rays of Cabot et al [1][2][3][4][5][6][7][8] is rather wide, a fact which might aggravate their assignment. Our inspection of the presented e-ray spectra of Schrewe et al (Fig.…”

Section: Alpha-ray Assignments To 266-169resupporting

confidence: 50%

“…The element assignment is based on xa3Cs(a6Ar, xn)169-~Ta [2,[4][5][6], 136Ba(36Ar, xn)172-xw, and 135Ba(36Ar, xn) 171 -~W cross-bombardments, in which no isotopes of the element rhenium can be produced.…”

Section: Excitation Functions and Cross-bombardmentsmentioning

confidence: 99%

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Revision of the decay data of166?170Re, including new isomers167m,169mRe

Meißner

Salewski

Schmidt‐Ott

et al. 1992

Z. Physik A - Hadrons and Nuclei

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The neutron-deficient rhenium isotopes 166-17~ were investigated using reactions of 32S with monoisotopic 141pr targets. Gamma-rays following the fl-decays of 166-169Rewere measured for the first time. Four new e-rays with energies of 4.70, 4.83, 4.87, and 5.02 MeV were detected in addition to the known 5.50, 5.26, and 5.06 MeV e-rays. Alpha-decaying isomer pairs were discovered in 167Re and 169Re. The measured half-lives are 2.3(2)s for 166Re, 3.4(4)s and 6.2(5)s for 167Re, 4.4(1)s for 168Re, 8.1(5)s and 16.3(8)s for 169Re, and 9.2(2)s for iV~ The nuclear structure is discussed in terms of single-particle states.

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Energy levels and branching ratios for Lu-164(Lutetium-164)

Sukhoruchkin¹,

Soroko²

2008

Tables of Excitations of Proton- And Neutron-Rich Unstable Nuclei

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Spectroscopic investigation of 164,168Ta, 166,W and 164,165Hf

Cited by 36 publications

References 16 publications

Gas chemical investigation of hafnium and zirconium complexes with hexafluoroacetylacetone using preseparated short-lived radioisotopes

Gas chemical investigation of hafnium and zirconium complexes with hexafluoroacetylacetone using preseparated short-lived radioisotopes

Revision of the decay data of166?170Re, including new isomers167m,169mRe

Energy levels and branching ratios for Lu-164(Lutetium-164)

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