Experimental investigation of vibrational excitations in230Th

Ackermann, B.; Baltzer, H.; Freitag, Κ.; Günther, C.; Herzog, P.; Manns, J.; Müller, U.; Panlsen, R.; Sevenich, P.; Weber, Thorsten; Will, B.; Boer, J. de; Graw, G.; Levon, A. I.; Loewe, Markus; Lösch, A.; Müller-Zanotti, E.

doi:10.1007/bf01285047

Cited by 12 publications

(17 citation statements)

References 20 publications

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“…About 200 levels have been identified in the spectra for all ten angles and are listed in Table II. The energies and spins of the levels as derived from this study are compared to known energies and spins from the published data [16,17,18]. They are given in the first four columns.…”

Section: Experiment Analysis and Experimental Data A Details Of The E...mentioning

confidence: 99%

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Spectroscopy ofTh230in the(p,t)reaction

et al. 2009

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The excitation spectra in the deformed nucleus 230 Th were studied by means of the (p,t) reaction, using the Q3D spectrograph facility at the Munich Tandem accelerator. The angular distributions of tritons are measured for about 200 excitations seen in the triton spectra up to 3.3 MeV. Firm 0 + assignments are made for 16 excited states by comparison of experimental angular distributions with the calculated ones using the CHUCK code. Additional assignments are possible: relatively firm for 4 states and tentative also for 4 states. Assignments up to spin 6 + are made for other states. Sequences of the states are selected which can be treated as rotational bands and as multiplets of excitations. Experimental data are compared with interacting boson model (IBM) and quasiparticlephonon model (QPM) calculations.

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Section: Experiment Analysis and Experimental Data A Details Of The E...mentioning

confidence: 99%

“…There are some contradictions in the assignment of the energy of the second 4 + level. It has been proposed from Coulomb excitation to be at 772.1 keV in [25] and at 769.6 keV in [26] and from the (d,pnγ) reaction at 775.5 keV [18]. The value 769.6 keV is accepted in the compilation [16].…”

Section: B Dwba Analysismentioning

confidence: 99%

Spectroscopy ofTh230in the(p,t)reaction

et al. 2009

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“…The experimental infor-mation about the low-lying states of 228,230 Th and 232 U is summarized in Refs. [33][34][35] and several more recent experimental investigations [21][22][23][24]28,36,37], including a ͑p , t͒ study of the lowest states [23]. Addressed to theoretical understanding of these nuclei there are a number of recent publications which are related mainly to features of octupole collectivity [38][39][40][41][42][43][44], triaxiality [45,46], and to the description within interacting boson approximations [47][48][49][50][51][52].…”

Section: A Quadrupole and Octupole Collectivitymentioning

confidence: 99%

“…In recent years a few more 0 + states had been identified [21][22][23][24], but the understanding of the higher excited 0 + states remains as a challenge for nuclear theory. Within their quasiparticle model (QPM) Soloviev and co-workers [25][26][27][28] provided microscopic understanding of low-lying 0 + states.…”

Section: Introductionmentioning

confidence: 99%

0+states in deformed actinide nuclei by the(p,t)reaction

et al. 2004

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By means of the ͑p , t͒ reaction we study the excitation spectra of 0 + states in the deformed nuclei 228 Th, 230 Th, and 232 U, using the Q3D magnetic spectrograph facility at the Munich tandem accelerator. At small reaction angles the 0 + transfer angular distributions have steeply rising cross sections which allow us to identify these states in otherwise very complicated and dense spectra. For each of these nuclei we resolve typically about ten excited states with safe 0 + assignments. The studied excitation energies range up to 2.5, 2.7, and 2.3 MeV, respectively, and the summed transfer strengths add to more than 60% of the ground state strength. As in a recent study of 158 Gd we compare with interacting boson approximation (IBA) calculations in the spdf boson space. This highly schematic collective model description, including octupole collectivity, but neglecting other relevant degrees of freedom, gives numbers of excited 0 + states in these actinide nuclei that are rather close to the observed ones.

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“…The most productive mode of obtaining information about collective and other excitation modes is the use of the direct reaction of two-neutron transfer, which, for practical reasons, is mainly the (p,t) reaction. It was found to be a very effective tool to study the multiple 0 + excitations in actinide and rare earth nuclei [7][8][9][10][11][12][13][14][15][16][17][18][19]. For some nuclei in these studies, extensive information was also obtained for states with higher spins of the positive and negative parity up to 6 [12-14, 17, 20].…”

Section: Introductionmentioning

confidence: 99%

High-resolution study of excited states in 158Gd with (p,t) reactions

Levon,

Bucurescu,

Costache

et al. 2019

Preprint

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The excitation spectra in the deformed nucleus 158 Gd have been studied with high energy resolution by means of the (p,t) reaction using the Q3D spectrograph facility at the Munich Tandem accelerator. The angular distributions of tritons were measured for more than 200 excited states seen in the triton spectra up to 4.3 MeV. A number of 36 excited 0 + states (five tentative), have been assigned by comparison of experimental angular distributions with the calculated ones using the CHUCK code. Assignments for levels with higher spins are the following: 95 for 2 + states, 64 for 4 + states, 14 for 6 + states and about 20 for negative parity states. Sequences of states which can be treated as rotational bands are selected. The analysis of the moments of inertia defined for these bands is carried out. This high number of excited states in a deformed nucleus, close to a complete level scheme, constitutes a very good ground to check models of nuclear structure. The large ensembles of states with the same spin-parity offer unique opportunities for statistical analysis. Such an analysis for the 0 + , 2 + and 4 + states sequences, for all K-values and for well-determined projections K of the angular momentum is performed. The obtained data may indicate on a K symmetry breaking. Experimental data are compared with interacting boson model (IBM) calculations using the spdf version of the model. The energies of the low-lying levels, the transition probabilities in the first bands and the distribution in transfer intensity of the 0 + states are calculated and compared with experiment.

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Experimental investigation of vibrational excitations in230Th

Cited by 12 publications

References 20 publications

Spectroscopy ofTh230in the(p,t)reaction

Spectroscopy ofTh230in the(p,t)reaction

0+states in deformed actinide nuclei by the(p,t)reaction

High-resolution study of excited states in 158Gd with (p,t) reactions

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