Lifetimes and electromagnetic decay properties of negative-parity states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Sm</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mn>5</mml:mn><mml:mn>0</mml:mn><mml:mo>,</mml:mo><mml:mn>1</mml:mn><mml:mn>5</mml:mn><mml:mn>2</mml:mn><mml:mo>,</mml:mo><mml:mn>1</mml:mn><mml:mn>5</mml:mn><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow

Jungclaus, A.; Belgya, T.; DiPrete, D. P.; Villani, M.; Johnson, E. L.; Baum, E. M.; McGrath, C. A.; Yates, S. W.; Zamfir, N. V.

doi:10.1103/physrevc.48.1005

Cited by 18 publications

(4 citation statements)

References 13 publications

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“…The main features of octupole deformed nuclei are reflection asymmetry (pearlike shape) and "quasimolecular" rotational bands of alternating-parity states connected by strong electricdipole transitions. Most experimental studies have been done at low angular momentum and only in recent years have there been measurements of higher-lying members of rotational bands in transitional and deformed nuclei [4][5][6][7][8][9][10][11][12] where the quasimolecular rotational bands are clearly observed.…”

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Fingerprints of Reflection Asymmetry at High Angular Momentum in Atomic Nuclei

1998

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The reflection asymmetric phase transition in nuclei at high angular momentum is analyzed in the framework of the cranked Hartree-Fock-Bogoliubov approximation, with the Gogny interaction, using approximate parity projection before variation. The N 88 isotones are studied and our results compared with experimental data. Good agreement is found for the energy splitting of the even and odd parity states and B͑E1͒ transition probabilities. Differences on intrinsic deformations, dipole moments, and pairing energies between odd and even parity states found at low spin disappear with increasing angular momentum. [S0031-9007(98)

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confidence: 99%

“…4 we display the B͑E1͒ values as a function of the spin. [4,9], 146 Ce [5], 148 Nd [10], and 150 Sm [11] are represented by full circles and the theoretical results by open ones. For spin values in the reflection-symmetric phase one expects smaller B͑E1͒ values than in the reflectionasymmetric one (because of the poor w.f.…”

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Fingerprints of Reflection Asymmetry at High Angular Momentum in Atomic Nuclei

1998

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“…[ 9 ]. Table 2 lists the deduced frequencies ω D for all five targets using the lifetime value of τ= 29 fs obtained by Jungclaus et al [ 14 ]. Note that all crystal effects connected to the EuO target were neglected.…”

Section: Description Of the Slowing Down Process And Resultsmentioning

confidence: 99%

Neutrino induced Doppler broadening

Jolie

Stritt

2000

J. Res. Natl. Inst. Stand. Technol.

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When a nucleus undergoes beta decay via the electron capture reaction, it emits an electron neutrino. The neutrino emission gives a small recoil to the atom, which can be experimentally observed as a Doppler broadening on subsequently emitted gamma rays. Using the two-axis flat-crystal spectrometer GAMS4 and the electron capture reaction in 152Eu, the motion of atoms having an excess kinetic energy of 3 eV in the solid state was studied. It is shown how the motion of the atom during the first hundreds of femtoseconds can be reconstructed. The relevance of this knowledge for a new neutrino helicity experiment is discussed.

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“…Since the K--0 states have strong E1 transitions, their lifetimes are typically tens of femtoseconds. Doppler-shift methods such as those used in the (n, n' y) experiment of [14] would provide the best opportunity for performing these measurements successfully.…”

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Can strong electric dipole transitions in deformed rare earth nuclei be explained by the macroscopic behavior of the octupole phonon?

Cottle

1994

Z. Physik A - Hadrons and Nuclei

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Abstract. Strong E1 transitions of greater than 10 -3 Weisskopf units occur in many octupole states in the deformed rare earth region. It is shown using the droplet model that the electric dipole moment resulting from the macroscopic behaviour of the octupole phonon cannot by itself account for the observed E 1 strengths, and it is observed tha~this result is consistent with the proposal of Donner and Greiner and of Zilges yon Brentano and Richter that admixtures of the giant dipole resonance into the low energy octupole states are responsible for the fast E 1 transitions. It is also suggested that calculations similar to those performed by Egido and Robledo for N < 92 nuclei may be able to reproduce E 1 transitions in N = 94-104 nuclei. PACS: 21.60.Ev; 23.20.Lv During the past decade a significant amount of attention was focused on nuclei possessing stable reflection asymmetric shapes. One of the interesting aspects of such nuclei is the presence of strong electric dipole transitions, occassionally as large as 10 .2 Weisskopf units (W.u.). However, it has been demonstrated that strong E1 transitions can occur in nuclei which do not have stable reflection asymmetric shapes. For example, strong E1 transitions associated with octupole vibrations occur in the spherical nuclei 96Zr [1] and 1448m [2]. Strong E1 transitions (> 10-3W.u.) associated with octupole vibrations have also been observed in even-even rare earth nuclei in Coulomb excitation experiments (for example see [3]) or by using the technique of nuclear resonance fluorescence (see [4] and references therein).The discussions of the E1 strengths associated with octupole vibrations in the rare earth nuclei have centered on two possible origins. The first possibility is that Supported by the National Science Foundation and the State of Florida the strong E1 transitions arise from the macroscopic behavior of the ocutpole phonon. This mechanism was first suggested more than thirty years ago [5,6] and has more recently been discussed by Iachello [7]. The second hypothesis is that small admixtures of the giant dipole resonance (GDR) are responsible for the strong E1 transitions. That is, the J= 1 state of a K--0 or 1 octupole band would have a wavefunction of the formwhere fl ~ e. States of higher angular momentum would be obtained by applying the appropriate operators to (1). The mixing of the giant dipole resonance into low energy octupole states was a feature of the model of Donner and Greiner [8]. More recently, Zilges et al. [9] have used this argument to explain the results of their measurements of 1-states in even-even rare earth nuclei. The measurements reported in [9] imply that f12, as defined in (1), is near 5 • 10 -4 for the deformed rare earth nuclei. In this article, the hypothesis that the macroscopic behavior of the octupole phonon is responsible for the strong E1 transitions is tested by using the droplet model prescription of Dorso et al. [10] to make realistic estimates of the electric dipole moment caused by an axial octupole shape, and...

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Lifetimes and electromagnetic decay properties of negative-parity states inSm150,152,154

Cited by 18 publications

References 13 publications

Fingerprints of Reflection Asymmetry at High Angular Momentum in Atomic Nuclei

Fingerprints of Reflection Asymmetry at High Angular Momentum in Atomic Nuclei

Neutrino induced Doppler broadening

Can strong electric dipole transitions in deformed rare earth nuclei be explained by the macroscopic behavior of the octupole phonon?

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