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Article ; Online: Microscopic Structure of the Low-Energy Electric Dipole Response of ^{120}Sn.

Weinert, M / Spieker, M / Potel, G / Tsoneva, N / Müscher, M / Wilhelmy, J / Zilges, A

2021 Volume 127, Issue 24, Page(s) 242501

Abstract: The microscopic structure of the low-energy electric dipole response, commonly denoted as pygmy dipole resonance (PDR), was studied for ^{120}Sn in a ^{119}Sn(d,pγ)^{120}Sn experiment. Unprecedented access to the single-particle structure of excited 1^{-} ...

Abstract	The microscopic structure of the low-energy electric dipole response, commonly denoted as pygmy dipole resonance (PDR), was studied for ^{120}Sn in a ^{119}Sn(d,pγ)^{120}Sn experiment. Unprecedented access to the single-particle structure of excited 1^{-} states below and around the neutron-separation threshold was obtained by comparing experimental data to predictions from a novel theoretical approach. The novel approach combines detailed structure input from energy-density functional plus quasiparticle-phonon model theory with reaction theory to obtain a consistent description of both the structure and reaction aspects of the process. The presented results show that the understanding of one-particle-one-hole structures of the 1^{-} states in the PDR region is crucial to reliably predict properties of the PDR and its contribution to nucleosynthesis processes.
Language	English
Publishing date	2021-12-24
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.127.242501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Origin of low-lying enhanced E1 strength in rare-Earth nuclei.

Spieker, M / Pascu, S / Zilges, A / Iachello, F

Physical review letters

2015 Volume 114, Issue 19, Page(s) 192504

Abstract: The experimental E1 strength distribution below 4 MeV in rare-earth nuclei suggests a local breaking of isospin symmetry. In addition to the octupole states, additional J^{π}=1^{-} states with enhanced E1 strength have been observed in rare-earth nuclei ... ...

Abstract	The experimental E1 strength distribution below 4 MeV in rare-earth nuclei suggests a local breaking of isospin symmetry. In addition to the octupole states, additional J^{π}=1^{-} states with enhanced E1 strength have been observed in rare-earth nuclei by means of (γ,γ') experiments. By reproducing the experimental results, the spdf interacting boson model calculations provide further evidence for the formation of an α cluster in medium-mass nuclei and might provide a new understanding of the origin of low-lying E1 strength.
Language	English
Publishing date	2015-05-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.114.192504
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in ^{208}Pb.

Spieker, M / Heusler, A / Brown, B A / Faestermann, T / Hertenberger, R / Potel, G / Scheck, M / Tsoneva, N / Weinert, M / Wirth, H-F / Zilges, A

Physical review letters

2020 Volume 125, Issue 10, Page(s) 102503

Abstract: New experimental data on the neutron single-particle character of the Pygmy Dipole Resonance (PDR) in ^{208}Pb are presented. They were obtained from (d,p) and resonant proton scattering experiments performed at the Q3D spectrograph of the Maier-Leibnitz ...

Abstract	New experimental data on the neutron single-particle character of the Pygmy Dipole Resonance (PDR) in ^{208}Pb are presented. They were obtained from (d,p) and resonant proton scattering experiments performed at the Q3D spectrograph of the Maier-Leibnitz Laboratory in Garching, Germany. The new data are compared to the large suite of complementary, experimental data available for ^{208}Pb and establish (d,p) as an additional, valuable, experimental probe to study the PDR and its collectivity. Besides the single-particle character of the states, different features of the strength distributions are discussed and compared to large-scale shell model (LSSM) and energy-density functional plus quasiparticle-phonon model theoretical approaches to elucidate the microscopic structure of the PDR in ^{208}Pb.
Language	English
Publishing date	2020-07-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.125.102503
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Investigation of the reaction 90Zr(p,γ) with in-beam γ-ray spectroscopy

Erbacher Philipp / Endres A. / Glorius J. / Netterdon L. / Sonnabend K. / Thomas B. / Zilges A.

EPJ Web of Conferences, Vol 93, p

2015 Volume 02021

Abstract: The p nucleus 92Mo is believed to be mainly produced through photodisintegration reactions in type II supernovae. However, this production scenario cannot solely account for the observed solar relative isotopic abundance of 92Mo. Additional production ... ...

Abstract	The p nucleus 92Mo is believed to be mainly produced through photodisintegration reactions in type II supernovae. However, this production scenario cannot solely account for the observed solar relative isotopic abundance of 92Mo. Additional production scenarios have been suggested to explain this discrepancy. One of these scenarios could be the production of 92Mo in type Ia supernovae via a chain of proton-capture reactions. To verify this scenario, an accurate knowledge of the involved reaction rates is important. We measured the cross section of 90Zr(p,γ) reaction using an enriched 90Zr target by means of in-beam γ-ray spectroscopy in the energy range between 3.6MeV and 5.1MeV. Since the reactions 90Zr(p,γ) and 91Zr(p,n) produce the same nucleus, the contributions of both reactions have to be disentangled. This procedure is explained in this contribution in detail.
Keywords	Science ; Q ; Physics ; QC1-999
Language	English
Publishing date	2015-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: ΔK=0 M1 Excitation Strength of the Well-Deformed Nucleus ^{164}Dy from K Mixing.

Beck, T / Werner, V / Pietralla, N / Bhike, M / Cooper, N / Friman-Gayer, U / Isaak, J / Jolos, R V / Kleemann, J / Krishichayan / Papst, O / Tornow, W / Bernards, C / Crider, B P / Ilieva, R S / Löher, B / Mihai, C / Naqvi, F / Pascu, S /

Peters, E E / Prados-Estevez, F M / Ross, T J / Savran, D / Vanhoy, J R / Zilges, A

Physical review letters

2020 Volume 125, Issue 9, Page(s) 92501

Abstract: The size of a ΔK=0 M1 excitation strength has been determined for the first time in a predominantly axially deformed even-even nucleus. It has been obtained from the observation of a rare K-mixing situation between two close-lying J^{π}=1^{+} states of ... ...

Abstract	The size of a ΔK=0 M1 excitation strength has been determined for the first time in a predominantly axially deformed even-even nucleus. It has been obtained from the observation of a rare K-mixing situation between two close-lying J^{π}=1^{+} states of the nucleus ^{164}Dy with components characterized by intrinsic projection quantum numbers K=0 and K=1. Nuclear resonance fluorescence induced by quasimonochromatic linearly polarized γ-ray beams provided evidence for K mixing of the 1^{+} states at 3159.1(3) and 3173.6(3) keV in excitation energy from their γ-decay branching ratios into the ground-state band. The ΔK=0 transition strength of B(M1;0_{1}^{+}→1_{K=0}^{+})=0.008(1)μ_{N}^{2} was inferred from a mixing analysis of their M1 transition rates into the ground-state band. It is in agreement with predictions from the quasiparticle phonon nuclear model. This determination represents first experimental information on the M1 excitation strength of a nuclear quantum state with a negative R-symmetry quantum number.
Language	English
Publishing date	2020-07-10
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.125.092501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: E2 decay strength of the M1 scissors mode of ^{156}Gd and its first excited rotational state.

Beck, T / Beller, J / Pietralla, N / Bhike, M / Birkhan, J / Derya, V / Gayer, U / Hennig, A / Isaak, J / Löher, B / Ponomarev, V Yu / Richter, A / Romig, C / Savran, D / Scheck, M / Tornow, W / Werner, V / Zilges, A / Zweidinger, M

Physical review letters

2017 Volume 118, Issue 21, Page(s) 212502

Abstract: The E2/M1 multipole mixing ratio δ_{1→2} of the 1_{sc}^{+}→2_{1}^{+} γ-ray decay in ^{156}Gd and hence the isovector E2 transition rate of the scissors mode of a well-deformed rotational nucleus has been measured for the first time. It has been obtained ... ...

Abstract	The E2/M1 multipole mixing ratio δ_{1→2} of the 1_{sc}^{+}→2_{1}^{+} γ-ray decay in ^{156}Gd and hence the isovector E2 transition rate of the scissors mode of a well-deformed rotational nucleus has been measured for the first time. It has been obtained from the angular distribution of an artificial quasimonochromatic linearly polarized γ-ray beam of energy 3.07(6) MeV scattered inelastically off an isotopically highly enriched ^{156}Gd target. The data yield first direct support for the deformation dependence of effective proton and neutron quadrupole boson charges in the framework of algebraic nuclear models. First evidence for a low-lying J^{π}=2^{+} member of the rotational band of states on top of the 1^{+} band head is obtained, too, indicating a significant signature splitting in the K=1 scissors mode rotational band.
Language	English
Publishing date	2017-05-26
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.118.212502
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Study of the Pygmy Dipole Resonance in (p,p’γ) and (d,pγ) experiments with SONIC@HORUS

Pickstone S. G. / Derya V. / Hennig A. / Mayer J. / Spieker M. / Weinert M. / Wilhelmy J. / Zilges A.

EPJ Web of Conferences, Vol 93, p

2015 Volume 01053

Abstract: Last year, the new silicon-detector array SONIC with up to 8 silicon-detector positions was installed inside the existing γ-ray spectrometer HORUS consisting of 14 HPGe detectors. The combined setup SONIC@HORUS allows for a coincident detection of γ-rays ...

Abstract	Last year, the new silicon-detector array SONIC with up to 8 silicon-detector positions was installed inside the existing γ-ray spectrometer HORUS consisting of 14 HPGe detectors. The combined setup SONIC@HORUS allows for a coincident detection of γ-rays and light charged particles in the exit channel of inelastic scattering and transfer reactions. As a first physics case, the Pygmy Dipole Resonance (PDR) in 92Mo has been investigated in a (p,p’γ) experiment at Ep = 10.5 MeV. Since specific excitation energy can be chosen oﬄine in the coincidence data, the sensitivity to weak decay branchings of PDR states is increased. Additionally, a second reaction mechanism for the excitation of PDR states has been tested with the new setup. In a 119Sn(d,pγ) transfer reaction at Ed = 8.5 MeV, PDR states in 120Sn could be excited. Since this one-neutron transfer reaction is sensitive to the neutron single-particle structure, it could reveal new information on the microscopic structure of the PDR.
Keywords	Science ; Q ; Physics ; QC1-999
Subject code	530
Language	English
Publishing date	2015-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Octupole correlations in positive-parity states of rare-earth and actinide nuclei

Spieker M. / Pascu S. / Bucurescu D. / Faestermann T. / Hertenberger R. / Wirth H.-F. / Zamfir N.-V. / Zilges A.

EPJ Web of Conferences, Vol 93, p

2015 Volume 01009

Abstract: In this contribution, further evidence of the importance of multiphonon-octupole excitations to describe experimental data in the rare earths and actinides will be presented. First, new results of a (p, t) experiment at the Q3D magnetic spectrograph in ... ...

Abstract	In this contribution, further evidence of the importance of multiphonon-octupole excitations to describe experimental data in the rare earths and actinides will be presented. First, new results of a (p, t) experiment at the Q3D magnetic spectrograph in Munich will be discussed, which was performed to selectively excite Jπ = 0+ states in 240Pu. spdf interacting boson model (IBM) calculations suggest that the previously proposed double-octupole phonon nature of the Jπ = 0+2 state is not in conflict with its strong (p, t) population. Second, the framework of the IBM has been adopted for the description of experimental observables related to octupole excitations in the rare earths. Here, the IBM is able to describe the signature splitting for positiveand negative-parity states when multi-dipole and multi-octupole bosons are included. The present study might support the idea of octupole-phonon condensation at intermediate spin (Jπ = 10+) leading to the change in yrast structure observed in 146Nd.
Keywords	Science ; Q ; Physics ; QC1-999
Subject code	539
Language	English
Publishing date	2015-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Study of the isospin character of 1-states using hadronic probes at intermediate energies

Derya V. / Endres J. / Harakeh M.N. / Savran D. / Spieker M. / Wörtche H.J. / Zilges A.

EPJ Web of Conferences, Vol 93, p

2015 Volume 01041

Abstract: The complementary (γ, γ′) and (α, α′γ) reactions were used to study the isospin properties of low-lying E1 excitations in the doubly-magic nucleus 48Ca. In contrast to heavier nuclei, a state-to-state change in isospin character was revealed in 48Ca and ... ...

Abstract	The complementary (γ, γ′) and (α, α′γ) reactions were used to study the isospin properties of low-lying E1 excitations in the doubly-magic nucleus 48Ca. In contrast to heavier nuclei, a state-to-state change in isospin character was revealed in 48Ca and a dominant isoscalar excitation was found which is interpreted as an isoscalar oscillation. Recently, protons at 80 MeV were used as an additional hadronic probe in a p-γ coincidence experiment on 140Ce for the first time. Results of the experiments on 48Ca and first results of the 140Ce will be presented in this contribution.
Keywords	Science ; Q ; Physics ; QC1-999
Language	English
Publishing date	2015-01-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Thesis: Untersuchung niedrigliegender Dipolanregungen in den Kernen der Seltenen Erden

Zilges, Andreas

1992

Language	Undetermined
Size	II Bl., 61 S, graph. Darst, 21 cm
Document type	Book ; Thesis
Thesis / German Habilitation thesis	@Köln, Univ., Diss. : 1992
Database	Former special subject collection: coastal and deep sea fishing

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