Spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mn>232</mml:mn></mml:mmultiscripts></mml:math>in the (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>p</mml:mi></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>t</mml:mi></mml:math>) reaction: More information on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>0</mml:mn><m

Levon, A. I.; Alexa, Petr; Graw, G.; Hertenberger, R.; Pascu, S.; Thirolf, P. G.; Wirth, H.‐F.

doi:10.1103/physrevc.92.064319

Cited by 14 publications

(40 citation statements)

References 39 publications

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“…5. This is a fact, which was in its extent unexpected due to the experience with previous (p, t) studies in 228,230 Th [19,32] but, however, multistep excitations were also observed for the case of 232 U [20]. Nevertheless, it has been possible to assign 30 4 + states out of which twelve are firmly and 18 tentatively assigned, respectively.…”

Section: Kevsupporting

confidence: 58%

“…Second, σ(1 − 2 ) (p,t) might be larger than or equal to σ(1 − 1 ) (p,t) in 232 U and 240 Pu while the strength pattern is inverted in 228,230 Th. Third, significant cross sections to higher-lying excited 1 − states at about 1.6 MeV to 1.8 MeV are observed in 230 Th [32], 232 U [20] and 240 Pu but not in 228 Th [19]. And the fourth point, a discontinuity is once again observed at N B = 11, see Fig.…”

Section: B Octupole Excitations or α-Clustering?mentioning

confidence: 83%

“…In fact, it was speculated before whether these large moments of inertia could be attributed to double-octupole phonon excitations, see, e.g., Refs. [19,20,32]. Certainly, the K π = 0 + 2 MoI is larger than the the corresponding ground-state band as well as the K π = 0 + 3 MoI, see Table III.…”

Section: Imentioning

confidence: 90%

“…HF(0 + 2 ) HF(1 − 1 ) Figure 10. (color online)(a)-(f ) (p, t) cross sections for the 0 + 1 , 2 + 1 , 0 + 2 , 2 + 2 , 0 + 3 , and 2 + 3 states as a function of boson number NB for 228,230 Th (NB = 10, 11) [19,32], 232 U (NB = 12) [20], and 240 Pu (NB = 16). (g)-(l) the B(E2; 2 + 1 → 0 + 1 ) values, excitation energies E(0 + 2 ) and E(1 − 1 ), experimental (symbols) and theoretical B(E3; 3 − 1 → 0 + 1 ) values (lines) from Refs.…”

Section: Imentioning

confidence: 99%

“…(color online) (a) (p, t) cross sections σ (p,t) depicted as a function of excitation energy for the J π = 1 − states observed in 228,230 Th[19,32], 232 U[20] and 240 Pu. (b) centroid energies calculated from the excitation energies and σ (p,t) of the J π = 1 − states as a function of the boson number NB.…”

mentioning

confidence: 99%

See 4 more Smart Citations

High-resolution (p,t) study of low-spin states in Pu240 : Octupole excitations, α
Spieker
¹
,
Pascu
²
,
Bucurescu
³

et al. 2018
Phys. Rev. C
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22
1
15
0
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Background: Many nuclear-structure features have been observed in the actinides during the last decades. Especially the octupole degree of freedom has been discussed lately after the successful measurement of the B E3; 0 + 1 → 3 − 1 reduced transition strength in 224 Ra. Recent results stemming from γ-spectroscopy experiments and high-resolution (p, t) experiments suggested, that strong octupole correlations might be observed for some positive-parity states of actinide nuclei. Purpose: This work completes a series of (p, t) experiments on actinide nuclei by adding the data on 240 Pu. The (p, t) experiments allow to study low-spin states up to J π = 6 + . Besides two-nucleon transfer cross sections, spin and parity can be assigned to excited states by measuring angular distributions, and several rotational bands are recognized based on these assignments. Methods: A high-resolution (p,t) experiment at Ep= 24 MeV was performed to populate lowspin states in the actinide nucleus 240 Pu. The Q3D magnetic spectrograph of the Maier-Leibnitz Laboratory (MLL) in Munich (Germany) was used to identify the ejected tritons via dE/E particle identification with its focal-plane detection system. Angular distributions were measured at nine different Q3D angles to assign spin and parity to the excited states based on a comparison with coupled-channels DWBA calculations. Results: In total, 209 states have been excited in 240 Pu up to an excitation energy of 3 MeV. Many previously known states have also been observed and their spin-parity assignments were confirmed. However, many of the populated states have been seen for the first time, e.g., 15 new and firmly assigned J π = 0 + states. In addition, all low-spin one-octupole phonon excitations, i.e. K π = 0 − , 1 − , 2 − , 3 − , could be observed and a new candidate for the K = 3 projection is proposed. Furthermore, the double-octupole or α-cluster structure of the 0 + 2 state in 240 Pu has been studied in more detail. It is shown that the 0 + 2 state in 230 Th has a distinctly different structure. In addition, strongly excited 1 − states have been observed at 1.5 MeV and 1.8 MeV in 240 Pu. The present study suggests that similar states might be observed in 230 Th. Conclusions: At least two different and distinct structures for J π = 0 + states are present in the actinides. These are pairing states and states with enhanced octupole correlations. We have shown that it is crucial to consider negative-parity single-particle states being admixed to some K π = 0 + 2 rotational bands to understand the α-decay hindrance factors and enhanced E1-decay rates. Based on our analysis, we have identified the double-octupole or α-cluster K π = 0 + candidates from 224 Ra to 240 Pu.

show abstract

Section: Kevsupporting

confidence: 58%

Section: B Octupole Excitations or α-Clustering?mentioning

confidence: 83%

Section: Imentioning

confidence: 90%

Section: Imentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

High-resolution (p,t) study of low-spin states in Pu240 : Octupole excitations, α
Spieker
¹
,
Pascu
²
,
Bucurescu
³

et al. 2018
Phys. Rev. C
Self Cite
22
1
15
0
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show abstract

Investigation of 0⁺ strength in ¹⁵⁰Sm using the (p,t) reaction

Ionescu

Pascu

Sima

et al. 2020

J. Phys.: Conf. Ser.

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The aim of this investigation is to reveal the structure of 150Sm by measuring for the first time a rather complete set of energy levels of this nucleus up to 4 MeV and determine the total angular momentum of the states. The study was carried out at the 14 MV Tandem Accelerator of the Munich universities by measuring complete angular distributions for states up to 4 MeV excited in the direct two-neutron transfer reaction 152Sm(p,t)150Sm at an incident energy of 22 MeV. Emphasis was put on determining the 0+ excited states, which are some of the most important excitations in the rare-earth region. Up to now only three 0+ levels are known in 150Sm, and investigating the distribution of energy and intensity of these excited states also at higher excitation energy might reveal the main contributions in the wave functions of this nucleus.

show abstract

New data on 0+ states in Gd158

et al. 2019

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Spectroscopy ofU232in the (p,t) reaction: More information on0

Cited by 14 publications

References 39 publications

High-resolution (p,t) study of low-spin states in Pu240 : Octupole excitations, α
Spieker
¹
,
Pascu
²
,
Bucurescu
³

et al. 2018
Phys. Rev. C
Self Cite
22
1
15
0
View full text Add to dashboard Cite

High-resolution (p,t) study of low-spin states in Pu240 : Octupole excitations, α
Spieker
¹
,
Pascu
²
,
Bucurescu
³

et al. 2018
Phys. Rev. C
Self Cite
22
1
15
0
View full text Add to dashboard Cite

Investigation of 0⁺ strength in ¹⁵⁰Sm using the (p,t) reaction

New data on 0+ states in Gd158

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Spectroscopy ofU232in the (p,t) reaction: More information on0

Cited by 14 publications

References 39 publications

High-resolution (p,t) study of low-spin states in Pu240 : Octupole excitations, αSpieker1, Pascu2, Bucurescu3 et al. 2018Phys. Rev. CSelf Cite221150View full textAdd to dashboardCite

High-resolution (p,t) study of low-spin states in Pu240 : Octupole excitations, αSpieker1, Pascu2, Bucurescu3 et al. 2018Phys. Rev. CSelf Cite221150View full textAdd to dashboardCite

Investigation of 0+ strength in 150Sm using the (p,t) reaction

New data on 0+ states in Gd158

Contact Info

Product

Resources

About

High-resolution (p,t) study of low-spin states in Pu240 : Octupole excitations, α
Spieker
¹
,
Pascu
²
,
Bucurescu
³

et al. 2018
Phys. Rev. C
Self Cite
22
1
15
0
View full text Add to dashboard Cite

High-resolution (p,t) study of low-spin states in Pu240 : Octupole excitations, α
Spieker
¹
,
Pascu
²
,
Bucurescu
³

et al. 2018
Phys. Rev. C
Self Cite
22
1
15
0
View full text Add to dashboard Cite

Investigation of 0⁺ strength in ¹⁵⁰Sm using the (p,t) reaction