Emergence of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>16</mml:mn></mml:mrow></mml:math>shell gap in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">O</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>21</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Fernández–Domínguez, B.; Thomas, J. S.; Catford, W. N.; Delaunay, F.; Brown, Susannah; Orr, N. A.; Rejmund, M.; Labiche, M.; Chartier, M.; Achouri, N. L.; Falou, H. Al; Ashwood, N. I.; Beaumel, D.; Blumenfeld, Y.; Brown, B. A.; Chapman, R.; Curtis, N.; Force, C.; Franchoo, S.; Guillot, J.; Haigh, P.; Hammache, F.; Lapoux, V.; Lemmon, R. C.; Maréchal, F.; Moro, A. M.; Mougeot, X.; Mouginot, B.; Nalpas, L.; Navin, A.; Patterson, N.; Pietras, B.; Pollacco, E. C.; Leprince, A.; Ramus, A.; Scarpaci, J. A.; Séréville, N. de; Stephan, Ina; Sorlin, O.; Wilson, G. L.

doi:10.1103/physrevc.84.011301

Cited by 35 publications

(11 citation statements)

References 33 publications

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“…Only the two large ℓ = 0 fragments were used in the ν1s 1/2 centroid determination and an additional uncertainty of 50 keV was added due to possible missed strength. The present value for the N = 14 gap size is in reasonable agreement with the neutron-rich oxygen isotopes which are known to have a sub-shell closure at N =14 [17,27], but a little lower than than the value in 22,23 O [50,51]. However, it is comparably larger than the N = 14 gap in the C isotopes where a reduction of the shell gap has been observed [52,53].…”

Section: B N = 14 and 16 Shell Gapssupporting

confidence: 86%

“…The addition of one neutron onto the 21 F ground state could result in occupancy of either the 0d 5/2 (ℓ = 2), 1s 1/2 (ℓ = 0), or 0d 3/2 (ℓ = 2) orbitals and final-state J π values of 0 + -5 + , 2 + -3 + or 1 + -4 + , respectively. For sd-shell nuclei with Z < 10, most of the ℓ = 2 strength belonging to the neutron 0d 5/2 orbital lies below an excitation energy of ∼ 2 MeV while the 0d 3/2 strength has been observed at much higher energies (E x 4-5 MeV) [17,[27][28][29]. Similarly, the bulk of the ℓ = 0 neutron 1s 1/2 strength typically lies below E x ≈ 2-3 MeV.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the effective nucleon-nucleon interaction using the F21(d,p)F22

et al. 2018

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The single-neutron configurations of several low-lying states in 22 F have been determined from neutron-adding cross sections of a (d,p) reaction using a 21 F radioactive beam in inverse kinematics. Final states in 22 F consisting of a proton in the π0d 5/2 orbital coupled to a neutron in either the ν0d 5/2 , ν1s 1/2 , or ν0d 3/2 orbitals were observed up to an excitation energy of ∼ 5 MeV. Spectroscopic factors and strengths were determined from the angular distribution of the cross sections using a distorted wave Born approximation method. The distribution of the ν0d 5/2 and ν1s 1/2 strength was well described by all USD effective shell model interactions, while only the more recent USDA/USDB interactions showed a marked improvement in describing the observed ν0d 3/2 strength. Diagonal two-body matrix elements of the (0d 5/2) 2 J =0−5 effective nucleon-nucleon interaction were extracted from the data and compared with previous determinations of the same matrix elements from particle-particle and hole-hole spectra, as well as the calculated results of the USDA interactions. No significant discrepancies were observed. Inspection of the monopole energies showed that an improved agreement between the different empirical matrix elements is found if a mass dependence is included.

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Section: B N = 14 and 16 Shell Gapssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Experimental study of the effective nucleon-nucleon interaction using the F21(d,p)F22

et al. 2018

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“…These well-established, empirically derived interactions have had success in describing the positive-parity spectroscopic factors for nuclei in the vicinity of the present work [11,62,63]. The interactions assume a closed 16 O core, confining the neutrons to the 0d 5/2 , 1s 1/2 , and 0d 3/2 orbitals, and their two-body matrix elements were determined from fitting to the available experimental data.…”

Section: Shell-model Calculationsmentioning

confidence: 97%

Experimental study of the19O(d,p)20O

et al. 2012

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The neutron-adding (d,p) reaction was carried out in inverse kinematics to investigate the single-neutron overlap with the 19 O ground state. Eight states in 20 O were populated with measurable strength and a Q-value resolution of approximately 175 keV FWHM was achieved. Cross sections, angular distributions, spectroscopic factors, and T = 1 diagonal two-body matrix elements were deduced. Results are discussed in terms of shellmodel calculations confined to the 0d 5/2 , 1s 1/2 , and 0d 3/2 orbitals.

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“…We focus on the 20 O(d,p) 21 O reaction, which was recently investigated in inverse kinematics with a radioactive beam [23]. This is one of very few cases where angular cross sections for both bound and resonance states have been measured in the same experiment.…”

Section: O(dp) 21 O: Focus On Resonancesmentioning

confidence: 99%

“…We adopted the recommended spin-parity assignments from Ref. [23], namely 5/2 + and 1/2 + for the ground and first excited states, respectively, and 3/2 + for the resonance at E ex = 4.77 MeV. Because there is some ambiguity as to whether the resonance at E ex = 6.17 MeV has 3/2 + or 7/2 − character, we considered both possibilities.…”

Section: O(dp) 21 O: Focus On Resonancesmentioning

confidence: 99%

Reexamining surface-integral formulations for one-nucleon transfers to bound and resonance states

et al. 2014

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One-nucleon transfer reactions, in particular (d,p) reactions, have played a central role in nuclear structure studies for many decades. Present theoretical descriptions of the underlying reaction mechanisms are insufficient for addressing the challenges and opportunities that are opening up with new radioactive beam facilities. We investigate a theoretical approach that was proposed recently to address shortcomings in the description of transfers to resonance states. The method builds on ideas from the very successful R-matrix theory; in particular, it uses a similar separation of the coordinate space into interior and exterior regions and introduces a parametrization that can be related to physical observables, which, in principle, makes it possible to extract meaningful spectroscopic information from experiments. We carry out calculations, for a selection of isotopes and energies, to test the usefulness of the new approach.

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Emergence of theN=16shell gap inO21

Cited by 35 publications

References 33 publications

Experimental study of the effective nucleon-nucleon interaction using the F21(d,p)F22

Experimental study of the effective nucleon-nucleon interaction using the F21(d,p)F22

Experimental study of the19O(d,p)20O

Reexamining surface-integral formulations for one-nucleon transfers to bound and resonance states

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