Beta-decay to the proton halo state in 17F

Borge, M. J. G.; Deding, J.; Hansen, P. G.; Jonson, B.; Pinedo, Gabriel Martinez; Møller, P.; Nyman, G.; Poves, A.; Richter, A.; Riisager, K.; Tengblad, O.

doi:10.1016/0370-2693(93)91564-4

Cited by 65 publications

(40 citation statements)

References 31 publications

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“…We will devote a special discussion to A = 17 nuclei, since they have already got a lot of attention from both experimental and theoretical sides, because of the enormously large asymmetries of the first forbidden β-decay transition rates [56,57,58].…”

Section: A=17mentioning

confidence: 99%

On the asymmetry of Gamow–Teller β-decay rates in mirror nuclei in relation with second-class currents

Smirnova

Volpe

2003

Nuclear Physics A

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The theoretical evaluation of major nuclear structure effects on the asymmetry of allowed GamowTeller β-decay rates in light mirror nuclei is presented. The calculations are performed within the shell model, using empirical isospin-nonconserving interaction and realistic Woods-Saxon radial wave functions. The revised treatment of p-shell nuclei is supplemented by systematic calculations for sdshell nuclei and compared to experimental asymmetries when available. The results are important in connection with the possible existence of second-class currents in the weak interaction.

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Section: A=17mentioning

confidence: 99%

On the asymmetry of Gamow–Teller β-decay rates in mirror nuclei in relation with second-class currents

Smirnova

Volpe

2003

Nuclear Physics A

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“…Proton-rich 17 Ne is a candidate for a two-proton halo [2,3], cluster structures have been found in 20−22 Ne and 24 Mg [4], and the isotopes around N = 20 make up the so-called island of inversion [5], where a weakening or even disappearance of the neutron magic number is visible.…”

Section: Introductionmentioning

confidence: 99%

Charge radii of neon isotopes across thesdneutron shell

et al. 2011

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We report on the changes in mean square charge radii of unstable neon nuclei relative to the stable 20 Ne, based on the measurement of optical isotope shifts. The studies were carried out using collinear laser spectroscopy on a fast beam of neutral neon atoms. High sensitivity on short-lived isotopes was achieved thanks to nonoptical detection based on optical pumping and state-selective collisional ionization, which was complemented by an accurate determination of the beam kinetic energy. The new results provide information on the structural changes in the sequence of neon isotopes all across the neutron sd shell, ranging from the proton drip line nucleus and halo candidate 17 Ne up to the neutron-rich 28 Ne in the vicinity of the "island of inversion." Within this range the charge radius is smallest for 24 Ne with N = 14 corresponding to the closure of the neutron d 5/2 shell, while it increases toward both neutron shell closures, N = 8 and N = 20. The general trend of the charge radii correlates well with the deformation effects which are known to be large for several neon isotopes. In the neutron-deficient isotopes, structural changes arise from the onset of proton-halo formation for 17 Ne, shell closure in 18 Ne, and clustering effects in 20,21 Ne. On the neutron-rich side the transition to the island of inversion plays an important role, with the radii in the upper part of the sd shell confirming the weakening of the N = 20 magic number. The results add new information to the radii systematics of light nuclei where data are scarce because of the small contribution of nuclear-size effects to the isotope shifts which are dominated by the finite-mass effect.

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“…In paper [12] effects of the "halo" kind (connected with larger radial extension of WF on the proton side) were considered being irrelevant for the β-decay asymmetry problem [9]. However, in paper [14] the β-decay asymmetry was successfully explained in these terms.…”

mentioning

confidence: 99%

“…Available experimental data include Coulomb excitation [4,5] and low energy nuclear fragmentation [6,7] configuration is predicted to dominate, while in paper [11] the dominating configuration is predicted to be d 2 . In paper [12] effects of the "halo" kind (connected with larger radial extension of WF on the proton side) were considered being irrelevant for the β-decay asymmetry problem [9]. However, in paper [14] the β-decay asymmetry was successfully explained in these terms.…”

mentioning

confidence: 99%

Possibility to study a two-proton halo inNe17

Grigorenko

Zhukov

2005

Phys. Rev. C

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The nuclide17 Ne is studied theoretically in a three-body 15 O+p+p model. We demonstrate that the experimental condition for existence of a proton halo in 17 Ne can be reasonably quantified in terms of s/d configuration mixing. We discuss experimental evidences for a proton halo in 17 Ne. We define which kind of experimental data could elucidate this issue.PACS numbers: 21.60. Gx, 21.10.Sf, 25.60.Dz, 25.60.Gc The 17 Ne nucleus is an interesting and relatively poorly studied system. It is a Borromean nucleus, since none of the binary subsystems (15 O-p and p-p) are bound. It seems to be the only realistic candidate to possess a twoproton halo [1,2]. The level scheme was established not so long ago [3] in multineutron transfer reactions. Available experimental data include Coulomb excitation [4,5] and low energy nuclear fragmentation [6,7] configuration is predicted to dominate, while in paper [11] the dominating configuration is predicted to be d 2 . In paper [12] effects of the "halo" kind (connected with larger radial extension of WF on the proton side) were considered being irrelevant for the β-decay asymmetry problem [9]. However, in paper [14] the β-decay asymmetry was successfully explained in these terms. It seems that theoretical agreement about the basic properties of 17 Ne is still missing at the moment.In papers [7,15] the comparatively narrow core momentum distribution was interpreted as possible evidence for proton halo in 17 Ne. This is a reasonable approach to the problem, as among typical experimental evidences for halo (e.g. large interaction, electromagnetic dissociation, and nucleon removal cross sections), the momentum distributions should give most expressed signal for this system. The aim of this paper is to test three-body WFs, obtained in [2], against the most recent experimental data [5,7]. We demonstrate that the experimental question of the proton halo existence in 17 Ne formulated as in [7,15] is largely defined by s/d configuration mixing. As we have already mentioned, the exact s/d ratio in 17 Ne is difficult to obtain unambiguously by theoretical calculations. To derive it from experimental data it is necessary to know the sensitivity of various observables to this aspect of the dynamics. We show that currently available experimental data are insufficient to determine reliably the structure (and possible halo properties) of 17 Ne. We can, however, confidently define which kind of experimental data is required to resolve the puzzling issues of the 17 Ne structure. the admixture of excited core configurations was found to be below 5 %, which is not enough to change "bulk" properties of these nuclei significantly. The core matter radius enters the definition of the composite system radius, the core charge radius is used to define a Coulomb interaction (if needed). For 15 N the charge radius is known from electron scattering r ch ( 15 N) = 2.615 fm [18]. The corresponding matter radius is r mat ( 15 N) = 2.49 fm. We estimated the matter radius of 15 O in two ways (from known experim...

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Beta-decay to the proton halo state in 17F

Cited by 65 publications

References 31 publications

On the asymmetry of Gamow–Teller β-decay rates in mirror nuclei in relation with second-class currents

On the asymmetry of Gamow–Teller β-decay rates in mirror nuclei in relation with second-class currents

Charge radii of neon isotopes across thesdneutron shell

Possibility to study a two-proton halo inNe17

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