Bound excited states in 27F

Elekes, Z.; Dombrádi, Zs.; Saito, A.; Aoi, N.; Baba, H.; Demichi, K.; Fülöp, Zs.; Gibelin, J.; Gomi, T.; Hasegawa, H.; Imai, N.; Ishihara, M.; Iwasaki, H.; Kanno, S.; Kawai, S.; Kishida, T.; Kubo, T.; Kurita, K.; Matsuyama, Y. U.; Michimasa, S.; Minemura, T.; Motobayashi, T.; Notani, M.; Ohnishi, T.; Ong, H. J.; Ota, S.; Ozawa, A.; Sakai, H.; Sakuraï, H.; Shimoura, S.; Takeshita, Eri; Takeuchi, Satoshi; Tamaki, M.; Togano, Y.; Yamada, K.; Yanagisawa, Y.; Yoneda, K.

doi:10.1016/j.physletb.2004.08.028

Cited by 47 publications

(43 citation statements)

References 18 publications

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“…The Monte Carlo shell model with SDPF-M effective interactions (MCSM), which includes cross-shell excitations [5,6], reproduces data in the region of the "island of inversion" [7]. This region of the nuclear chart includes neutron-rich Ne, Na, and Mg nuclei whose low-lying structure is dominated by neutron particle-hole excitations across the N = 20 shell gap ( [7,8] and references therein).Indications for cross-shell excitations have also been observed in neutron-rich fluorine isotopes [9]. While the first *…”

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confidence: 61%

“…Indications for cross-shell excitations have also been observed in neutron-rich fluorine isotopes [9]. While the first *…”

mentioning

confidence: 96%

“…Neutron-unbound states in 25 F and 26 F were populated via the reactions 9 Be( 26 Ne, 24 F + n) and 9 Be( 26 Ne, 25 F + n), respectively. A resonance close to the neutron separation energy in 25 F was identified with a decay energy of 28 ± 4 keV.…”

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confidence: 99%

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Neutron-unbound states in25,26F

et al. 2011

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There are no bound oxygen isotopes past N = 16 while bound fluorine isotopes extend out to at least N = 22. Understanding the change in nuclear structure that underlies this difference has been the focus of considerable theoretical work. This change has been attributed to the spin-isospin component of the nucleon-nucleon force [1] which results in a larger energy gap between the ν(1s 1/2 ) and ν(0d 3/2 ) orbitals in oxygen isotopes [2]. At the same time, the gap between the ν(0d 3/2 ) orbital and the pf shell decreases as the number of protons increases from Z = 8 to Z = 14 [3]. While the anomaly in the location of the oxygen dripline is not reproduced by shell-model calculations based on microscopic two-nucleon forces, it was recently demonstrated that the inclusion of three-nucleon forces provides a microscopic explanation [4]. The smaller shell gap enhances the possibility for cross-shell excitations. The Monte Carlo shell model with SDPF-M effective interactions (MCSM), which includes cross-shell excitations [5,6], reproduces data in the region of the "island of inversion" [7]. This region of the nuclear chart includes neutron-rich Ne, Na, and Mg nuclei whose low-lying structure is dominated by neutron particle-hole excitations across the N = 20 shell gap ( [7,8] and references therein).Indications for cross-shell excitations have also been observed in neutron-rich fluorine isotopes [9]. While the first *

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confidence: 61%

“…Indications for cross-shell excitations have also been observed in neutron-rich fluorine isotopes [9]. While the first *…”

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confidence: 96%

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Neutron-unbound states in25,26F

et al. 2011

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“…Coupling to the nonresonant continuum and/or to eventual lowlying resonances may also play an important role in explaining the excitation energy spectrum of 25 F. Preliminary papers on the study of 25 F from the fragmentation of the stable 36 S beam at the Grand Accelerateur National d'Ions Lourds (GANIL) were already published [14][15][16]. We reported on four γ lines, two of which were confirmed in an experiment performed at Rikagaku Kenkyusho (The Institute of Physical and Chemical Research) of Japan (RIKEN) [17]. In the final analysis of the spectra seven γ rays could be assigned to 25 F [18]; however, γ -γ coincidence was not available and only a tentative level scheme could be constructed for 25 F from these data.…”

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confidence: 61%

Excited states in the neutron-rich nucleus F25

et al. 2014

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The structure of the nucleus 25 9 F was investigated through in-beam γ -ray spectroscopy of the fragmentation of 26 Ne and 27,28 Na ion beams. Based on the particle-γ and particle-γ γ coincidence data, a level scheme was constructed and compared with shell model and coupled-cluster calculations. Some of the observed states were interpreted as quasi-single-particle states built on top of the closed-shell nucleus 24 O, while the others were described as states arising from coupling of a single proton to the 2 + core excitation of 24 O.

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“…It is noted that in Ref. [46] a couple of low-lying states of 25 F and 27 F are observed. They reported that these states are not reproduced by an sd-pf shell model that does not include proton excitation and pointed out the possibility of the proton and neutron excitation in these states.…”

Section: Bmentioning

confidence: 94%

Molecule-like structure with covalent neutrons of F isotopes toward the neutron drip line

Kimura

Furutachi

2011

Phys. Rev. C

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The α-cluster structure of F isotopes has been studied based on antisymmetrized molecular dynamics. By using the constraint on the principal quantum number, various neutron configurations are investigated. It is found that a proton excitation into an sd shell does not necessarily induce α clustering in 21 F and 23 F. However, once one or two neutrons are excited into the pf shell together with a proton excitation, the core nuclei have α clustering. The calculation is extended toward the neutron drip line. The neutron-rich F isotopes also have α clustering in the excited states and their excitation energy greatly decreases toward the neutron drip line. The relation between the reduction of their excitation energies and the breaking of the neutron magic number N = 20 is suggested.

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Bound excited states in 27F

Cited by 47 publications

References 18 publications

Neutron-unbound states in25,26F

Neutron-unbound states in25,26F

Excited states in the neutron-rich nucleus F25

Molecule-like structure with covalent neutrons of F isotopes toward the neutron drip line

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