Nuclear orientation at isolde/cern

Berkes, István; Hagn, E.; Herzog, P.; Niinikoski, T.; Postma, H.; Richard‐Serre, C.; Říkovská, J.; Stone, N. J.; Vanneste, L.; Zech, E.

doi:10.1007/bf02398294

Cited by 30 publications

(12 citation statements)

References 7 publications

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“…The reaction products diffused out of the 1900 • C hot target and effused via a hot transfer line to a FEBIAD-type "hot plasma" ion source. The atoms were ionized to 1 + ions, extracted, accelerated to 60 keV, mass separated by the ISOLDE General Purpose Separator (GPS) [10,11], and finally transported through the beam distribution system to be implanted into an iron foil inside the NICOLE 3 He- 4 He dilution refrigerator [8,12]. The 69 As + beam intensity after mass separation was typically about 2 × 10 6 ions/s at an average proton beam intensity of 2.5 µA.…”

Section: Experiments and Formalismmentioning

confidence: 99%

Nuclear magnetic moment ofAs69from on-line β-NMR on oriented nuclei

et al. 2005

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A precise value for the magnetic moment of the 69 As 5/2 − ground state has been obtained from nuclear magnetic resonance on oriented nuclei (NMR/ON) using the NICOLE 3 He-4 He dilution refrigerator setup at ISOLDE/CERN. The NMR/ON signal was observed by monitoring the anisotropy of the 69 As β particles. The center frequency ν[B ext = 0.0994(10)T ] = 169.98(9) MHz corresponds to µ[ 69 As] = +1.6229(16)µ N . This result differs considerably from the πf 5/2 single-particle value obtained with g factors for a free proton but is in reasonable agreement with the value obtained with effective g factors and with values from a core polarization calculation and from calculations in the framework of the interacting boson-fermion model. Assuming a single exponential spin-lattice relaxation behavior a relaxation time T 1 = 10(25) s was observed for 69 AsFe at a temperature of about 20 mK in a magnetic field B = 0.1 T.

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Section: Experiments and Formalismmentioning

confidence: 99%

Nuclear magnetic moment ofAs69from on-line β-NMR on oriented nuclei

et al. 2005

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“…After diffusing out of the target, the 221 Fr nuclei were ionized in a W surface ion source [27], accelerated to 60 keV, and mass selected by the General Purpose Separator [28]. The radioactive ions were subsequently transported to the NICOLE LTNO setup [24,29], where they were implanted into the cooled Au or Si sample. A SRIM calculation [30] showed that the implantation depth of 221 Fr ions with an energy of 60 keV is 80Å for Au and 330Å for Si.…”

Section: The Experimentsmentioning

confidence: 99%

Half-life ofFr221in Si and Au at 4 K and at millikelvin temperatures

et al. 2010

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The half-life of the α-decaying nucleus 221 Fr was determined in different environments, that is, embedded in Si at 4 K, and embedded in Au at 4 K and about 20 mK. No differences in half-life for these different conditions were observed within 0.1%. Furthermore, we quote a value for the absolute half-life of 221 Fr of t 1/2 = 286.1(10) s that is of comparable precision to the most precise value available in the literature.

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“…These isotopes were produced directly and one after the other implanted on line ͑at 60 keV͒ into the same iron foil ͑purity 99.998%, thickness 50 m͒ that was soldered to the cold finger of the NICOLE 3 He- 4 He dilution refrigerator. 10 The 221 Fr source was prepared by implanting 221 Rn (T 1/2 ϭ25 min) produced on a ThC 2 target. After implantation the 221 Rn ␤ Ϫ decayed to 221 Fr.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Hyperfine field of francium in iron

et al. 1998

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The hyperfine field of francium in iron has been measured for different isotopes using the method of low-temperature nuclear orientation and samples prepared by ion implantation at Tр1 K. For 208 Fr a nuclear magnetic resonance was observed. From the center frequency L (B ext ϭ0 T)ϭ490.7(4) MHz, we derive the corresponding magnetic hyperfine field as B hf (FrFe)ϭ94.9(4) T. ͓S0163-1829͑98͒05118-2͔

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Nuclear orientation at isolde/cern

Cited by 30 publications

References 7 publications

Nuclear magnetic moment ofAs69from on-line β-NMR on oriented nuclei

Nuclear magnetic moment ofAs69from on-line β-NMR on oriented nuclei

Half-life ofFr221in Si and Au at 4 K and at millikelvin temperatures

Hyperfine field of francium in iron

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