Structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow /><mml:mn>13</mml:mn></mml:msup></mml:math>Be probed via secondary-beam reactions

Randisi, G.; Leprince, A.; Falou, H. Al; Orr, N. A.; Marqués, F. M.; Achouri, N. L.; Angélique, J. C.; Ashwood, N. I.; Bastin, B.; Bloxham, T.; Brown, B. A.; Catford, W. N.; Curtis, N.; Delaunay, F.; Freer, M.; Brennand, E. de Góes; Haigh, P.; Hanappe, F.; Harlin, C.; Bouchet, L.; Lecouey, J. L.; Ninane, A.; Patterson, N.; Price, D.L.; Stuttgé, L.; Thomas, J. S.

doi:10.1103/physrevc.89.034320

Cited by 35 publications

(75 citation statements)

References 84 publications

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“…This fit uses simple Breit-Wigner functions without energy shift [ (E rel = 0)] and without angular dependence of the width [ (E rel ) = r ]. It should be noted that a nonresonant continuum has been estimated using the event-mixing procedure, which is based on the measured pairs of fragment + neutron [54]. This component was added as a free parameter in the fit.…”

Section: A Experimental Results For 25 Fmentioning

confidence: 99%

Effective proton-neutron interaction near the drip line from unbound states in F25,26

Vandebrouck¹,

Lepailleur²,

Sorlin³

et al. 2017

Phys. Rev. C

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Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function of the binding energy, ultimately when nuclei become unbound, is poorly known. The 26 F nucleus, composed of a deeply bound π 0d 5/2 proton and an unbound ν0d 3/2 neutron on top of an 24 O core, is particularly adapted for this purpose. The coupling of this proton and neutron results in a J π = 1 1 + − 4 1 + multiplet, whose energies must be determined to study the influence of the proximity of the continuum on the corresponding proton-neutron interaction. The J π = 1 1 + , 2 1 + , 4 1 + bound states have been determined, and only a clear identification of the J π = 3 1 + is missing. Purpose: We wish to complete the study of the J π = 1 1 + − 4 1 + multiplet in 26 F, by studying the energy and width of the J π = 3 1 + unbound state. The method was first validated by the study of unbound states in 25 F, for which resonances were already observed in a previous experiment. Method: Radioactive beams of 26 Ne and 27 Ne, produced at about 440A MeV by the fragment separator at the GSI facility were used to populate unbound states in 25 F and 26 F via one-proton knockout reactions on a CH 2 target, located at the object focal point of the R 3 B/LAND setup. The detection of emitted γ rays and neutrons, added to the reconstruction of the momentum vector of the A − 1 nuclei, allowed the determination of the energy of three unbound states in 25 F and two in 26 F. Results: Based on its width and decay properties, the first unbound state in 25 F, at the relative energy of 49(9) keV, is proposed to be a J π = 1/2 − arising from a p 1/2 proton-hole state. In 26 F, the first resonance at 323(33) keV is proposed to be the J π = 3 1 + member of the J π = 1 1 + − 4 1 + multiplet. Energies of observed states in 25,26 F have been compared to calculations using the independent-particle shell model, a phenomenological shell model, and the ab initio valence-space in-medium similarity renormalization group method. Conclusions: The deduced effective proton-neutron interaction is weakened by about 30-40% in comparison to the models, pointing to the need for implementing the role of the continuum in theoretical descriptions or to a wrong determination of the atomic mass of 26 F.

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Section: A Experimental Results For 25 Fmentioning

confidence: 99%

Effective proton-neutron interaction near the drip line from unbound states in F25,26

Vandebrouck¹,

Lepailleur²,

Sorlin³

et al. 2017

Phys. Rev. C

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“…The transmission (including tracking detectors efficiency and loss of beam and fragment in the thick MINOS target) is evaluated separately from experimental data taking the average of the values obtained for 12 Be and 14 Be beam transmission (65.0(1)% and 62.9(2)%, respectively), and corresponds to 64(1)%. 12 Be core excited states that decay via gamma emission (2 + , 1 − ) were identified using a reduced version of the DALI2 gamma array consisting of 68 crystals, partially covering angles between 34 • and 115 • and arranged in order to avoid interference with (p, pn) measurement. Photopeak efficiency of this reduced version of DALI2 (called DALI2 hereafter) was 8.9(5)% and 7.0(4)% at 2.1 and 2.7 MeV, respectively.…”

Section: Methodsmentioning

confidence: 99%

Structure of 13Be probed via quasi-free scattering

et al. 2019

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We present an investigation of the structure of 13 Be obtained via a kinematically complete measurement of the (p, pn) reaction in inverse kinematics at 265 MeV/nucleon. The relative energy spectrum of 13 Be is compared to Transfer-to-the-Continuum calculations which use as structure inputs the overlaps of the 14 Be ground-state wave function, computed in a three-body model, with the unbound states of the 13 Be residual nucleus. The key role of neutron p-wave orbital in the interpretation of the low-relative-energy part of the spectrum is discussed.

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“…To describe the data presented in this work, previously observed states in 13,14 Be [11,12] were included in the simulations. These states are shown in Fig.…”

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confidence: 99%

“…However, the cross section for 2p2n removal is expected to be even smaller than the 2p removal. For the two-proton removal, a single resonance in 15 Be was assumed to decay via the 280-keV state in 14 Be and the α removal was allowed to populate any of the three previously measured resonances in 13 Be [11], shown in Fig. 1.…”

mentioning

confidence: 99%