Direct experimental evidence for a multiparticle-hole ground state configuration of deformed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Mg</mml:mi><mml:mprescripts /><mml:none /><mml:mn>33</mml:mn></mml:mmultiscripts></mml:math>

Pramanik, U. Datta; Rahaman, A.; Aumann, T.; Beceiro-Novo, S.; Boretzky, K.; Caesar, C.; Carlson, B. V.; Catford, W. N.; Chakraborty, Sovan; Chartier, M.; Cortina-Gil, D.; Angelis, G. de; Fernandez, P. Diaz; Emling, H.; Ershova, O.; Fraile, L. M.; Geißel, H.; González-Díaz, D.; Jonson, B.; Johansson, H.; Kalantar‐Nayestanaki, N.; Kroell, T.; Krüecken, R.; Kurcewicz, J.; Langer, C.; Bleis, T. Le; Leifels, Y.; Marganiec, J.; Muenzenberg, G.; Najafi, M. A.; Nilsson, T.; Nociforo, C.; Panin, V.; Paschalis, S.; Plag, R.; Reifarth, R.; Ricciardi, V.; Rossi, D.; Scheit, H.; Scheidenberger, C.; Simon, H.; Taylor, J. T.; Togano, Y.; Typel, S.; Волков, В. А.; Wagner, A.; Wamers, F.; Weick, H.; Weigand, M.; Winfield, J. S.

doi:10.1103/physrevc.94.034304

Cited by 10 publications

(20 citation statements)

References 40 publications

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“…It will also be of interest to understand how rotational properties are modified by the effect of Coriolis coupling. In fact, the ground state magnetic moment of 33 Mg supports this picture, being in good agreement with the value expected for a valence neutron coupled to a prolate axially symmetric rotor [11][12][13], but a more extensive description of 33 Mg in this framework has yet to emerge.…”

Section: Introductionsupporting

confidence: 73%

Strongly coupled rotational band in Mg33

et al. 2017

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The "Island of Inversion" at N ∼ 20 for the neon, sodium, and magnesium isotopes has long been an area of interest both experimentally and theoretically due to the subtle competition between 0p-0h and np-nh configurations leading to deformed shapes. However, the presence of rotational band structures, which are fingerprints of deformed shapes, have only recently been observed in this region. In this work, we report on a measurement of the low-lying level structure of 33 Mg populated by a two-stage projectile fragmentation reaction and studied with GRETINA. The experimental level energies, ground state magnetic moment, intrinsic quadrupole moment, and γ-ray intensities show good agreement with the strong-coupling limit of a rotational model.

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Section: Introductionsupporting

confidence: 73%

Strongly coupled rotational band in Mg33

et al. 2017

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“…Thus, we choose the one corresponding to C 7/2,3 = 0.75 and obtain the empirical wavefunction † : This result is in agreement with the conclusions of Refs. [21,22] where the authors pointed out the increased contribution from the 2p 3/2 orbital required to explain the observations, which is suggestive of its lowering compared to existing model predictions. In fact, the equal amplitudes, C 3/2,1 ≈ C 7/2,3 , needed in our † The uncertainty is dominated by the error associated with C 2 3/2,1 ; the error on the experimental magnetic moment is negligible.…”

Section: The Methodsmentioning

confidence: 79%

“…[21] reported the results of a neutron-removal experiment performed at the FRS/GSI, where inclusive cross-sections and longitudinal momentum distributions for the reaction 33 Mg(-1n) 32 Mg on a carbon target at 898 MeV/A were measured. More recently, direct experimental evidence of a multiple particle-hole ground state [22]. Spectroscopic factors, S j, , derived from those measurements and reported in Ref.…”

Section: The Methodsmentioning

confidence: 85%

“…As discussed earlier, one can reverse the argument and find the Nilsson amplitudes that provide a more consistent description of the experimental results. We make an empirical adjustment to reproduce the weighted mean (0.21 ± 0.1) of the data from [21,22] for the ground state and determine C 2 3/2,1 = 0.42 ± 0.2. However, given the uncertainties in the data, it is not possible to uniquely determine the other amplitudes from the spectroscopic factors.…”

Section: The Methodsmentioning

confidence: 99%

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Spectroscopic factors in the N=20 island of inversion: The Nilsson strong-coupling limit

et al. 2017

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Spectroscopic factors, extracted from one-neutron knockout and Coulomb dissociation reactions, for transitions from the ground state of 33 Mg to the ground-state rotational band in 32 Mg, and from 32 Mg to low-lying negative parity states in 31 Mg, are interpreted within the rotational model. Associating the ground state of 33 Mg and the negative parity states in 31 Mg with the 3 2 [321] Nilsson level, the strong coupling limit gives simple expressions that relate the amplitudes (C j ) of this wavefunction with the measured cross-sections and derived spectroscopic factors (S j ). To obtain a consistent agreement with the data within this framework, we find that one requires a modified 3 2 [321] wavefunction with an increased contribution from the spherical 2p 3/2 orbit as compared to a standard Nilsson calculation. This is consistent with the findings of large scale Shell Model calculations and can be traced to weak binding effects that lower the energy of low-orbitals.

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“…From the deflection angles measured by GFI, the time of flight measurements of the reaction fragments, the energy loss at the TFW and the magnetic rigidity of ALADIN, the masses of the outgoing reaction fragments were determined. For the detailed experimental setup and detector calibrations, see [42][43][44]. A direct breakup model [19,34,42,[45][46][47][48][49][50] was used for the analysis of the experimental data of the nonresonant continuum contribution of the Coulomb excitation.…”

Section: Methodsmentioning

confidence: 99%

Neutron capture cross sections of light neutron-rich nuclei relevant for r -process nucleosynthesis

Bhattacharyya¹,

Pramanik²,

Rahaman³

et al. 2021

Phys. Rev. C

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The measurements of neutron capture cross sections of neutron-rich nuclei are challenging but essential for understanding nucleosynthesis and stellar evolution processes in the explosive burning scenario. In the quest of r-process abundances, according to the neutrino-driven-wind model, light neutron-rich unstable nuclei may play a significant role as seed nuclei that influence the abundance pattern. Hence, experimental data for neutron capture cross sections of neutron-rich nuclei are needed. Coulomb dissociation of radioactive ion beams at intermediate energy is a powerful indirect method for inferring capture cross section. As a test case for validation of the indirect method, the neutron capture cross section (n, γ ) for 14 C was inferred from the Coulomb dissociation of 15 C at intermediate energy (600A MeV). A comparison between different theoretical approaches and experimental results for the reaction is discussed. We report for the first time experimental reaction cross sections of 28 Na(n, γ ) 29 Na, 29 Na(n, γ ) 30 Na, 32 Mg(n, γ ) 33 Mg, and 34 Al(n, γ ) 35 Al. The reaction cross sections were inferred indirectly through Coulomb dissociation of 29,30 Na, 33 Mg, and 35 Al at incident projectile energies around 400-430 A MeV using the FRS-LAND setup at GSI, Darmstadt. The neutron capture cross sections were obtained from the photoabsorption cross sections with the aid of the detailed balance theorem. The reaction rates for the neutron-rich Na, Mg, Al nuclei at typical r-process temperatures were obtained from the measured (n, γ ) capture cross sections. The measured neutron capture reaction rates of the neutron-rich nuclei, 28 Na, 29 Na, and 34 Al are significantly lower than those predicted by the Hauser-Feshbach decay model. A similar trend was observed earlier for 17 C and 19 N but in the case of 14 C(n, γ ) 15 C the trend is opposite. The situation is more complicated when the ground state has a multi-particle-hole configuration. For 32 Mg, the measured cross section is about 40-90 % higher than the Hauser-Feshbach prediction.

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Direct experimental evidence for a multiparticle-hole ground state configuration of deformedMg33

Abstract: The first direct experimental evidence of a multiparticle-hole ground state configuration of the neutron-rich 33

Cited by 10 publications

References 40 publications

Strongly coupled rotational band in Mg33

Strongly coupled rotational band in Mg33

Spectroscopic factors in the N=20 island of inversion: The Nilsson strong-coupling limit

Neutron capture cross sections of light neutron-rich nuclei relevant for r -process nucleosynthesis

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