Measurement ofg-factors in160Yb by a?-? coincidence technique

Lubkiewicz, E.; Emling, H.; Grein, H.; Kulessa, R.; Simon, R. S.; Wollersheim, H. J.; Ender, C.; Gerl, J.; Habs, D.; Schwalm, D.

doi:10.1007/bf01290183

Cited by 3 publications

(6 citation statements)

References 16 publications

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“…These data point to a significant contribution from aligned neutrons to the total spin of these states. A similar result of a reduced g factor, and the corresponding implication of neutron alignment, was found in high-spin regions in other rare-earth nuclei such as Dy [3] and ' ' ' Yb [5].…”

Section: Discussionsupporting

confidence: 57%

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Decay history and magnetic moments at high spin inDy152

et al. 1991

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Average magnetic moments as well as information on the time evolution of the continuum structure of " Dy at high spin have been obtained using the transient hyperfine magnetic field acting on fast ions traversing a thin, magnetized gadolinium foil. ' Dy nuclei were populated by the Ge(' Se, 4n)" Dy fusion-evaporation reaction at E(' Se) =326.5 MeV. The target-ferromagnet arrangement corresponds to a time window of about 70 & t & 1100 fs, during which the excited nuclei experience the transient field interaction. The statistical y rays, as well as the high-energy, E~) 1200 keV, y rays contributing to the collective E2 "bump, " exhibit a negligible precession, in accordance with the very short lifetimes of these states. The precession of the angular distribution of discrete yrast y rays deexciting the nucleus from spin I-35k down yields an average magnetic moment for states with 43%~I~31k. The resulting (g ) =0.21i2i is considerably lower than the collective value Z/3 -0.43 and indicates an appreciable contribution from aligned neutrons to the lower-spin region populated within the above time frame. The results are discussed in the framework of model calculations of the y-ray cascade.

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Section: Discussionsupporting

confidence: 57%

“…Previously, only a few spin precession experiments have been carried out for the higher-spin regime. The most notable were experiments [3] on ' ' Dy, where average g factors for 20% &.I & 30% were determined, and the experiments [4,5] on ' ' ' Yb, where yet higherspin states were probed.…”

Section: Introductionmentioning

confidence: 99%

Decay history and magnetic moments at high spin inDy152

et al. 1991

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“…Except for special cases, (like superdeformation, where the nuclei enter very shortly after excitation and stay in the rotational band for some time), an observed precession of the longer lived lower energy states reflects an accumulation of many contributions of higher short-lived states whose magnetic moments precessed in the ferromagnetic layer and which are generally not well known. Special target configurations, including spacers or variable gaps (plunger techniques) between the excitation and ferromagnetic layer designed so as to manipulate the time history of the recoiling probe ion, have been used with some success [16][17][18][19][20][21].…”

Section: Reactionsmentioning

confidence: 99%

“…In experiments with appropriate gaps between the target and the gadolinium foil one could allow variations in the transient field time window and hence probe the evolution of the nuclear structure as the nucleus decays from regions of high spin and excitation to the yrast line [17][18][19][20][21].…”

Section: High Spin Quasi-continuum States Inmentioning

confidence: 99%

Magnetic moments of short-lived excited nuclear states: measurements and challenges

Benczer‐Koller

Kumbartzki

2007

J. Phys. G: Nucl. Part. Phys.

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Magnetic moments have in general provided substantial information on the microscopic structure of nuclear states. Advances in technology have made it possible to measure, with reasonable accuracy, magnetic moments of nuclear states with lifetimes of the order of picoseconds or less. Improvements over the last decade involve all experimental aspects ranging from the availability of a wide variety of stable and radioactive beams, to the realization of highly segmented, high resolution detector arrays. A microscopic understanding of the hyperfine interaction between the nuclear moments and the ferromagnetic environment with which they interact has not yet been reached. Nevertheless, elegant applications of the new experimental techniques have allowed the measurement of nuclear moments of many nuclear states that were not accessible previously. Such measurements have shown how these moments vary with energy, spin and temperature in specific nuclei, or across isotopic chains. New results, in turn, have placed stringent constraints on theoretical calculations. The technical advances and selected highlights of relevant measurements across the periodic table are described in this review. Recent examples of applications of transient field and recoil-in-vacuum techniques in a radioactive beam environment are presented.

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“…[19]) they may represent a serious correction if large external fields and/or long interaction times are involved.…”

Section: Pls --T)mentioning

confidence: 99%

Hyperfine interaction studies on swift O-ions emerging with polarized electrons from ferromagnetic layers into vacuum

Kremeyer

Speidel

Jessensky

et al. 1994

Z. Physik A - Hadrons and Nuclei

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Abstraet.A precision plunger set-up was used to determine in time-differential measurements of hyperfine interactions the degree of polarization of Is-and 2s-electrons in H-and Li-like oxygen ions on their emergence from magnetized Ni-and Gd-layers into vacuum. In addition a time-integral measurement with Fe-layers served to obtain the polarization of 2s-electrons only. For all three ferromagnetic materials the degree of polarization of 2s-electrons is found to be twice as large as for Is-electrons. The data are discussed in the context of transient magnetic fields and their underlying polarization mechanism.

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Measurement ofg-factors in160Yb by a?-? coincidence technique

Cited by 3 publications

References 16 publications

Decay history and magnetic moments at high spin inDy152

Decay history and magnetic moments at high spin inDy152

Magnetic moments of short-lived excited nuclear states: measurements and challenges

Hyperfine interaction studies on swift O-ions emerging with polarized electrons from ferromagnetic layers into vacuum

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