Reorientation-effect measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>〈</mml:mo><mml:msubsup><mml:mn>2</mml:mn><mml:mn>1</mml:mn><mml:mo>+</mml:mo></mml:msubsup><mml:mo>∥</mml:mo><mml:mover accent="true"><mml:mrow><mml:mi>E</mml:mi><mml:mn>2</mml:mn></mml:mrow><mml:mo>̂</mml:mo></mml:mover><mml:mo>∥</mml:mo><mml:msubsup><mml:mn>2</mml:mn><mml:mn>1</mml:mn><mml:mo>+</mml:mo></mml:msubsup><mml:mo>〉</mml:mo></mml:mrow></mml:math>matrix element in<mm

Orce, J. N.; Drake, T.E.; Djongolov, M.; Navrátil, Petr; Triambak, S.; Ball, G.; Falou, H. Al; Churchman, R.; Cross, D. S.; Finlay, P.; Forssén, Christian; Garnsworthy, A. B.; Garrett, P. E.; Hackman, G.; Hayes, A. B.; Kshetri, R.; Lassen, J.; Leach, K. G.; Li, R.; Meißner, J.; Pearson, C. J.; Rand, E. T.; Sarazin, F.; Sjue, Sky; Stoyer, M. A.; Sumithrarachchi, C. S.; Svensson, C. E.; Tardiff, E. R.; Teigelhoefer, Andrea; Williams, Spencer J.; Wong, J.; Wu, C. Y.

doi:10.1103/physrevc.86.041303

Cited by 27 publications

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References 44 publications

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“…= 1 determined for the ground state of heavier nuclei [27]. This parameter represents the ratio of the observed isovector giant-dipole-resonance (GDR) effect to that predicted by the hydrodynamic model [27], and is a pivotal ingredient in the RE analysis of light nuclei, where κ > 1 values are generally observed [26][27][28][29][30][31][32][33][34].…”

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confidence: 99%

“…The experimental set up is very similar to the one given in Ref. [29] apart from the use of an S2 detector, which is segmented into 48 rings and 16 azimuthal sectors on the ohmic side, and has the 12 outermost rings incomplete; hence, it does not present full azimuthal or φ symmetry. The scattered beam was fully stopped in the 500-µm thick S2 detector.…”

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confidence: 99%

“…The corresponding γ−ray spectra were further cleaned by subtracting random coincidence events outside the 195-ns time window. An additional energy-sharing condition of |E ring −E sector | ≤ 350 keV between each ring and sector yields a large background reduction in the particle spectra and enables a better selection of the inelastic peaks [29]. This energysharing condition was chosen to achieve the most optimum background reduction while conserving the area of the 4439-keV peak in the γ−ray spectrum.…”

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confidence: 99%

“…The spectrum shows the 328-and 4439-keV γ−ray transitions depopulating the 2 + 1 level in 194 Pt and 12 C, respectively. Another second-order effect in Coulomb-excitation perturbation theory which may influence, particularly for light nuclei [26,28,29], the determination of both the sign and magnitude of 2 + 1 ||Ê2 || 2 + 1 is the E1 polarizability [41]. This involves virtual electric-dipole excitations via the GDR that polarize the shape of the 2 + 1 state through two-step processes of the type 0…”

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confidence: 99%

“…The normalization procedure used in Ref. [29] was applied to determine 2 + 1 ||Ê2 || 2 + 1 , where Coulombexcitation curves are determined in the 2 + 1 ||Ê2 || 2 + 1 − 2 + 1 ||Ê2 || 0 + 1 plane by fixing 2 + 1 ||Ê2 || 2 + 1 in steps of 0.01 eb, and varying 2 + 1 ||Ê2 || 0 + 1 until converging with the experimental intensity ratio between target and projectile, I T γ /I P γ , given by,…”

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confidence: 99%

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Reorientation-effect measurement of the first 2+ state in 12C: Confirmation of oblate deformation

et al. 2018

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A Coulomb-excitation reorientation-effect measurement using the TIGRESS γ−ray spectrometer at the TRI-UMF/ISAC II facility has permitted the determination of the 2 + 1 ||Ê2 || 2 + 1 diagonal matrix element in 12 C from particle−γ coincidence data and state-of-the-art no-core shell model calculations of the nuclear polarizability. The nuclear polarizability for the ground and first-excited (2 + 1 ) states in 12 C have been calculated using chiral NN N 4 LO500 and NN+3NF350 interactions, which show convergence and agreement with photo-absorption cross-section data. Predictions show a change in the nuclear polarizability with a substantial increase between the ground state and first excited 2 + 1 state at 4.439 MeV. The polarizability of the 2 + 1 state is introduced into the current and previous Coulombexcitation reorientation-effect analyses of 12 C. Spectroscopic quadrupole moments of Q S (2 + 1 ) = +0.053(44) eb and Q S (2 + 1 ) = +0.08(3) eb are determined, respectively, yielding a weighted average of Q S (2 + 1 ) = +0.071(25) eb, in agreement with recent ab initio calculations. The present measurement confirms that the 2 + 1 state of 12 C is oblate and emphasizes the important role played by the nuclear polarizability in Coulomb-excitation studies of light nuclei.

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