The theory of nuclear level mixing resonant spectroscopy

Coussement, R.; Put, Piotr; Scheveneels, G.; Hardeman, F.

doi:10.1007/bf02058949

Cited by 38 publications

(10 citation statements)

References 7 publications

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“…[11][12][13]. It has been shown that the method gives results that are compatible with other techniques and in many cases more appropriate to apply [15,16].…”

mentioning

confidence: 71%

“…A value of b 7.6͑ 10.2 20.4 ͒ 3 10 25 K 23͞2 was derived, resulting in a value V zz ͑WTl͒ 0.55͑ 10. 12 20.08 ͒ 3 10 21 V͞m 2 for the EFG at 473 K, accepting the T 3͞2 temperature dependence of the EFG. The large statistical uncertainty on this value is due to the parabolic behavior of the error bar, caused by the T 3͞2 functional dependence.…”

mentioning

confidence: 99%

“…They were in-beam implanted into a thick Tl polycrystalline foil, which served as a levelmixing spectroscopy (LEMS) host and as a beam stopper. The experiments were performed at the CYCLONE cyclotron at Louvain-la-Neuve, using the LEMS technique [11][12][13]. The experimental setup consists of a split-coil 4.4 T superconducting magnet, a target holder, allowing precise temperature control at the target position in the interval 4 -600 K, and 4 Ge detectors, which monitor the target through the holes of the magnet.…”

mentioning

confidence: 99%

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Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Balabanski

Vyvey²,

Neyens³

et al. 2001

Phys. Rev. Lett.

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The spectroscopic quadrupole moment of the high-spin, high- K five-quasiparticle isomer (K(pi) = 35/2(-), T(1/2) = 750(80) ns, E(i) = 3349 keV) in (179)W has been determined using the level mixing spectroscopy method. A value Q(s) = 4.00(+0.83-1.06)e b was derived, which corresponds to an intrinsic quadrupole moment Q0 = 4.73(+0.98-1.25)e b and to a quadrupole deformation beta(2) = 0.185(+0.038-0.049). These values differ significantly from the deduced ground-state quadrupole moments and are in disagreement with the current theoretical predictions in this mass region.

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“…[11][12][13]. It has been shown that the method gives results that are compatible with other techniques and in many cases more appropriate to apply [15,16].…”

mentioning

confidence: 71%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Balabanski

Vyvey²,

Neyens³

et al. 2001

Phys. Rev. Lett.

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“…This technique is known as the "level mixing resonance" (b-LMR) technique and is described extensively in Refs. [11] and [13]. By combining this method with a modified "nuclear magnetic resonance" (b-NMR) technique [14,15], both the magnetic moment 0031-9007͞99͞82(3)͞497(4)$15.00 and the ratio of the quadrupole to magnetic moments can be derived independently in one experiment.…”

mentioning

confidence: 99%

Magnetic Moment of the1−Ground State inN18
Neyens
¹
,
Coulier
²
,
Teughels
³

et al. 1999
Phys. Rev. Lett.
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19
1
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0
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The 18 N ground state magnetic moment jmj 0.135͑15͒m N has been measured using a modified b nuclear magnetic resonance technique. The value is compared to shell-model calculations. Spin-aligned 18 N projectile fragments were produced in the fragmentation of 22 Ne at 60.3 MeV͞nucleon. Polarization of the nuclear spins was resonantly induced by a combined magnetic dipole, electric quadrupole, and radio frequency interaction. This is the first application of a new method that allows production of polarized nuclei from spin-aligned projectile fragments, allowing one to measure b asymmetries. The method opens a new range of applications to study static dipole and quadrupole moments of exotic nuclei near the drip lines. [S0031-9007(98)08259-3] PACS numbers: 21.10. Ky, 23.20.En, 24.70. + s, 27.20. + n Nuclear moments provide a stringent test for nuclear models because, in general, they are extremely sensitive to the single-particle structure of valence particles. Comparison of experimental and theoretical nuclear moments can allow refinement of the interaction parameters [1] and provides a test of the models [2]. It becomes especially interesting if one can test nuclear theories close to the drip lines where the single-particle structure is not well established. Since the development of intermediate energy accelerators, followed by in-flight high-resolution recoil spectrometers [3,4], it has become possible to produce exotic nuclei in very clean conditions and in sufficient amounts to allow nuclear moment measurements. Moments of b-decaying ground states are measured via the asymmetric emission pattern of the decay electrons (positrons). e 1 ͞e 2 emission is asymmetric with respect to the nuclear spin direction, due to parity violation in the b decay. However, to obtain asymmetric b decay, the ensemble of the desired nuclei needs to be spin polarized (differently populated j1m͘ and j2m͘ quantum states, m ͗I z ͘). Producing spin-polarized nuclei has been a challenging experimental problem. Several techniques have been developed to polarize short-lived (ms , t , s) b-unstable nuclei after the production process, such as tilted foil polarization [5,6] or optical pumping [7,8]. When exotic nuclei are produced in a projectile fragmentation reaction, spin polarization can be obtained by the reaction itself, provided recoil fragments are selected at a nonzero angle with respect to the primary beam [9]. On the other hand, selecting projectile fragments in the forward direction is much more straightforward, es-pecially at high beam energies where much higher yields are obtained at forward angles. Fragments emitted parallel to the primary beam direction are not spin polarized, but spin aligned (equal population of j1m͘ and j2m͘ levels) [10]. In that case, a b-asymmetry measurement is possible only if polarization is induced by the applied hyperfine interactions. This procedure requires interactions that break the up-down symmetry in the quantum system.To measure the magnetic and quadrupole moment of b-decaying projectile fragment...

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“…In level mixing resonance (LMR) experiments [18][19][20], the magnetic field is chosen to be slightly misaligned with the EFG axis. This is done in a controlled way.…”

Section: Nuclear Level Mixed Statesmentioning

confidence: 99%

Slowing Down of Gamma Photons

Coussement

Gheysen

Serdons

et al. 2003

Hyperfine Interactions

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Abstract. By a transformation to a rotating reference system, a nuclear level mixing scheme is equivalent to a scheme with pure quadrupole splitting and a strong RF-drive between quadrupole split lines. It is shown that this scheme is similar to the one used in optics in which electromagnetically induced transparency (EIT) and low group velocity have been demonstrated. One can therefore consider the slowing down of gamma photons. However, with gamma photons one always works with single photons and the question remains whether the concept of group velocity can be applied.

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The theory of nuclear level mixing resonant spectroscopy

Cited by 38 publications

References 7 publications

Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Magnetic Moment of the1−Ground State inN18
Neyens
¹
,
Coulier
²
,
Teughels
³

et al. 1999
Phys. Rev. Lett.
Self Cite
19
1
1
0
View full text Add to dashboard Cite

Slowing Down of Gamma Photons

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The theory of nuclear level mixing resonant spectroscopy

Cited by 38 publications

References 7 publications

Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

Magnetic Moment of the1−Ground State inN18Neyens1, Coulier2, Teughels3 et al. 1999Phys. Rev. Lett.Self Cite19110View full textAdd to dashboardCite

Slowing Down of Gamma Photons

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Magnetic Moment of the1−Ground State inN18
Neyens
¹
,
Coulier
²
,
Teughels
³

et al. 1999
Phys. Rev. Lett.
Self Cite
19
1
1
0
View full text Add to dashboard Cite