Study of low-lying 0+ excitations in228Th and232,234,236U in the (p, t) reaction

Baltzer, H.; deBoer, J.; Gollwitzer, A.; Graw, G.; Günther, C.; Levon, A. I.; Loewe, Markus; Maier, H. J.; Manns, J.; Müller, U.; Valnion, B. D.; Weber, Thorsten; Würkner, M.

doi:10.1007/s002180050142

Cited by 19 publications

(11 citation statements)

References 20 publications

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“…The two members of the K ~ = 0~-band at 832 and 874 keV are established from (p, t) work [3,18], and the 7-ray branching ratios from the 2 + level observed in the 22SAc and 228pa decays are in good agreement. We note, however, that in both decays the 688 keV line must be a doublet, as assumed in Table 1, since its energy deviates from the 874 -* 187 keV transition energy by ~ 10 standard deviations.…”

Section: Level Energies and Spin-parity Assignmentssupporting

confidence: 89%

“…Five additional levels at excitation energies of 944, 968, 980, 1016, and 1060keV are listed in Table 1, which cannot be grouped easily into rotational bands. Our study of the 23~ t) reaction [18] suggests, that the levels at 980 adn 1016 keV have natural parity, whereas the 944 and 1060 keV levels might have unnatural parity. All five levels are only weakly populated in both the 228Ac and 22Spa decays, and no experimental information exists on the multipolarities of the depopulating 7-rays.…”

Section: Level Energies and Spin-parity Assignmentscontrasting

confidence: 59%

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Nuclear levels in228Th populated in the decay of228Pa

Baltzer

Freitag

Günther

et al. 1995

Z. Physik A - Hadrons and Nuclei

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The electron-capture decay of 22Spa to levels in 228Th has been studied using mass-separated sources and high-resolution y-ray and conversion-electron spectroscopy. A level at 979.5 keV is assigned as 2 § member of a second excited K = = 0 + band, with the 0 § band head at 938.6 keV. The 2 + and 3 + members of a second excited K s = 2 + band at 1153.5 and 1200.5 keV, which decay by strong E0 transitions to the 969 keV y-vibrational band, are confirmed, in addition we tentatively propose a K~= 1 § band at 944 keV. The KS= 0-, 1-and 2members of the octupole quadruplet are confirmed, and the y decay of these levels is analysed in an approach, in which the mixing of the octupole bands by the Coriolis interaction is taken into account. It is suggested that octupole correlations might be important for the E1 transition moments. A total of 29 levels is observed between 1.4 and ~ 2.0 MeV, for which the nuclear structure, and the possible assignment to rotational bands, is unclear.

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Section: Level Energies and Spin-parity Assignmentssupporting

confidence: 89%

Section: Level Energies and Spin-parity Assignmentscontrasting

confidence: 59%

Nuclear levels in228Th populated in the decay of228Pa

Baltzer

Freitag

Günther

et al. 1995

Z. Physik A - Hadrons and Nuclei

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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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“…Such measurements were carried out for the nuclei 228 Th, 230 Th and 232 U, and the results of a limited analysis have been published in [4] (besides the earlier preliminary study of 228 Th and 232,234,236 U in [5]). The paper [4] concentrated only on the energies of the excited 0 + states in these actinide nuclei and the (p,t) transfer strengths to these states.…”

mentioning

confidence: 99%

0+states and collective bands in228Th studied by the (p,
Levon
¹
,
Graw
²
,
Hertenberger
³

et al. 2013
Phys. Rev. C
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26
9
70
0
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The excitation spectra in the deformed nucleus 228 Th have been studied 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 about 110 excitations seen in the triton spectra up to 2.5 MeV. Firm 0 + assignments are made for 17 excited states by comparison of experimental angular distributions with the calculated ones using the CHUCK3 code. Assignments up to spin 6 + are made for other states. Sequences of states are selected which can be treated as rotational bands and as multiplets of excitations. Moments of inertia have been derived from these sequences, whose values may be considered as evidence of the two-phonon nature of most 0 + excitations. Experimental data are compared with interacting boson model (IBM) and quasiparticle-phonon model (QPM) calculations and with experimental data for 229 Pa.

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Study of low-lying 0+ excitations in228Th and232,234,236U in the (p, t) reaction

Cited by 19 publications

References 20 publications

Nuclear levels in228Th populated in the decay of228Pa

Nuclear levels in228Th populated in the decay of228Pa

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

0+states and collective bands in228Th studied by the (p,
Levon
¹
,
Graw
²
,
Hertenberger
³

et al. 2013
Phys. Rev. C
Self Cite
26
9
70
0
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Study of low-lying 0+ excitations in228Th and232,234,236U in the (p, t) reaction

Cited by 19 publications

References 20 publications

Nuclear levels in228Th populated in the decay of228Pa

Nuclear levels in228Th populated in the decay of228Pa

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

0+states and collective bands in228Th studied by the (p,Levon1, Graw2, Hertenberger3 et al. 2013Phys. Rev. CSelf Cite269700View full textAdd to dashboardCite

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0+states and collective bands in228Th studied by the (p,
Levon
¹
,
Graw
²
,
Hertenberger
³

et al. 2013
Phys. Rev. C
Self Cite
26
9
70
0
View full text Add to dashboard Cite