Complete scissors mode strength in heavy deformed odd-mass nuclei: a case study of 165Ho and 169Tm

Huxel, N.; Brentano, P. von; Eberth, J.; Enders, J.; Herzberg, R.‐D.; Neumann-Cosel, P. von; Nicolay, N.; Pietralla, N.; Prade, H.; Rangacharyulu, C.; Reif, J.; Richter, A.; Schlegel, C.; Schwengner, R.; Skoda, S.; Thomas, H. G.; Wiedenhöver, I.; Winter, G.; Zilges, A.

doi:10.1016/s0375-9474(98)00610-1

Cited by 40 publications

(16 citation statements)

References 53 publications

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“…Within the proton-neutron version of the interacting boson model (IBM-2) [9][10][11], a sum rule [3] has related this strength to the number of quadrupole d-bosons in the ground state wave function. For deformed nuclei the latter can be expressed in terms of the quadrupole deformation determined from B(E2) values, and the measured M1 strength was shown to be in good agreement with this sum rule [12] as well as with its counterpart [8] in odd-mass nuclei [13].…”

Section: Introductionsupporting

confidence: 53%

Extended M1 Sum Rule for Mixed-Symmetry States

Smirnova¹,

Pietralla²,

Leviatan³

et al. 2002

AIP Conference Proceedings

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A generalized M 1 sum rule for orbital magnetic dipole strength from excited symmetric states to mixed-symmetry states is considered within the protonneutron interacting boson model of even-even nuclei. Analytic expressions for the dominant terms in the B(M 1) transition rates from the 2 + 1,2 states are derived in the U(5) and SO(6) dynamic symmetry limits of the model, and the applicability of a sum rule approach is examined at and in-between these limits. Lastly, the sum rule is applied to the new data on mixed-symmetry states of 94 Mo and a quadrupole d-boson ratio n d (0 + 1 )/n d (2 + 2 ) ≈ 0.6 is obtained in a largely parameter-independent way.

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Section: Introductionsupporting

confidence: 53%

Extended M1 Sum Rule for Mixed-Symmetry States

Smirnova¹,

Pietralla²,

Leviatan³

et al. 2002

AIP Conference Proceedings

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“…In the situation where the scissors mode M 1 strength at the low-energy region is already spread out over a large energy span (2.5 − 4 MeV), it is clear that an experimental verification of (i) the presence of particle(hole)-scissors coupled configurations, and more compelling, (ii) if the total M 1 strength summed up in the appropriate energy interval in the odd-mass nucleus is consistent with the observed M 1 strength in the even-even adjacent nuclei, will not be easy. (Huxel et al, 1999).…”

Section: Magnetic Dipole Excitations In Heavy Odd-mass Nuclei a Exper...mentioning

confidence: 99%

“…Partly due to the low endpoint energy, no clear evidence for the presence of M 1 strength into the mixed-symmetric configurations, to be expected beyond 2.5 MeV, was detected. Using a higher endpoint energy of 4.8 MeV and an EUROBALL cluster module (von Neumann-Cosel, 1997), spectra of much higher quality could be measured at the S-DALINAC (Huxel et al, 1999) and we give an illustration for the case of 165 Ho (Fig. 36).…”

Section: Magnetic Dipole Excitations In Heavy Odd-mass Nuclei a Exper...mentioning

confidence: 99%

Magnetic dipole excitations in nuclei: Elementary modes of nucleonic motion

2010

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The nucleus is one of the most multi-faceted many-body systems in the universe. It exhibits a multitude of responses depending on the way one 'probes' it. With increasing technical advancements of beams at the various accelerators and of detection systems the nucleus has, over and over again, surprised us by expressing always new ways of 'organized' structures and layers of complexity. Nuclear magnetism is one of those fascinating faces of the atomic nucleus we discuss in the present review. We shall not just limit ourselves to presenting the by now very large data set that has been obtained in the last two decades using various probes, electromagnetic and hadronic alike and that presents ample evidence for a low-lying orbital scissors mode around 3 MeV, albeit fragmented over an energy interval of the order of 1.5 MeV, and higher-lying spin-flip strength in the energy region 5 − 9 MeV in deformed nuclei, nor to the presently discovered evidence for low-lying proton-neutron isovector quadrupole excitations in spherical nuclei. To the contrary, we put the experimental evidence in the perspectives of understanding the atomic nucleus and its various structures of well-organized modes of motion and thus enlarge our discussion to more general fermion and bosonic many-body systems.

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“…One possible explanation would be unresolved strength hidden in the background. To determine unresolved strength, a fluctuation analysis was applied to (γ, γ ) spectra in order to investigate the M 1 scissors mode strength in deformed odd-mass nuclei [69,[77][78][79][80]. In this section the method is explained and applied to the (γ, γ ) spectra of 112,120 Sn.…”

Section: Fluctuation Analysismentioning

confidence: 99%

Low-energy dipole strength inSn112,120

et al. 2014

Self Cite

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The 112,120 Sn(γ, γ ) reactions below the neutron separation energies have been studied at the superconducting Darmstadt electron linear accelerator S-DALINAC for different endpoint energies of the incident bremsstrahlung spectrum. Dipole strength distributions are extracted for 112 Sn up to 9.5 MeV and for 120 Sn up to 9.1 MeV. A concentration of dipole excitations is observed between 5 and 8 MeV in both nuclei. Missing strength due to unobserved decays to excited states is estimated in a statistical model. A fluctuation analysis is applied to the photon scattering spectra to extract the amount of the unresolved strength hidden in background due to fragmentation. The strength distributions are discussed within different model approaches such as the quasiparticle-phonon model and the relativistic time blocking approximation allowing for an inclusion of complex configurations beyond the initial particle-hole states. While a satisfactory description of the fragmentation can be achieved for sufficently large model spaces, the predicted centroids and total electric dipole strengths for stable tin isotopes strongly depend on the assumptions about the underlying mean field.

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Complete scissors mode strength in heavy deformed odd-mass nuclei: a case study of 165Ho and 169Tm

Cited by 40 publications

References 53 publications

Extended M1 Sum Rule for Mixed-Symmetry States

Extended M1 Sum Rule for Mixed-Symmetry States

Magnetic dipole excitations in nuclei: Elementary modes of nucleonic motion

Low-energy dipole strength inSn112,120

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