On line nuclear orientation: From technique to new physics

Wouters, Jan; Severijns, N.; Vanhaverbekf, J.; Vanderpoorten, W; Vanneste, L.

doi:10.1007/bf02401194

Cited by 19 publications

(14 citation statements)

References 58 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%

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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%

“…This yielded µ = +1.52 (19)µ N , which is in agreement with and of similar precision as the result from a previous LTNO experiment, viz. µ = +1.58 (16)µ N [7,8]. These values were then used to establish the, albeit rather broad, search region for the NMR/ON experiment.…”

Section: Data Collection and Analysismentioning

confidence: 99%

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

et al. 2005

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“…Substitutional fractions of about 70% to 95% are generally observed for 60-keV implantations into a cold (i.e., 4 K or lower) Fe foil (e.g., Refs. [21][22][23][24]). In LTNO experiments on α-decaying isotopes implanted in Fe, no half-life changes at the percent level were observed between room temperature and 1 K [17], and between 4 K and 50 mK [16].…”

Section: Introductionmentioning

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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“…The atoms were ionized to 1 + ions, extracted, accelerated to 60 keV, and then mass separated by the ISOLDE General Purpose Separator (GPS). Finally, the 104 Cd beam was transported through the beam distribution system and implanted into a 125-µm-thick, 99.99% pure iron foil soldered onto the cold finger of the 3 He- 4 He refrigerator of the NICOLE low-temperature nuclear orientation setup [13,14]. The iron foil supplied by Goodfellows was first polished and then annealed under a hydrogen atmosphere at ≈800…”

Section: A Sample Preparation and Detection Setupmentioning

confidence: 99%

Magnetic moment ofAg104mand the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance o

et al. 2010

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Nuclear magnetic resonance (NMR/ON) measurements with β-and γ -ray detection have been performed on oriented 104 , the anisotropy of the β particles provided the NMR/ON resonance signal at ν = 627.7(4) MHz. Using the new value for the hyperfine field of Ag in Fe, this frequency corresponds to the magnetic moment µ( 104m Ag) = +3.691(3) µ N , which is significantly more precise than previous results. The magnetic moments of the even-A 102-110 Ag isotopes are discussed in view of the competition between the (πg 9/2 ) −37/2 + (νd 5/2 νg 7/2 ) 5/2 + and the (πg 9/2 ) −3 9/2 + (νd 5/2 νg 7/2 ) 5/2 + configurations. The magnetic moments of the ground and isomeric states of 104 Ag can be explained by an almost complete mixing of these two configurations.

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On line nuclear orientation: From technique to new physics

Cited by 19 publications

References 58 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

Magnetic moment ofAg104mand the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance o

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