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Fortune, H. T.; Sherr, R.

doi:10.1103/physrevc.74.024301

Cited by 50 publications

(53 citation statements)

References 18 publications

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“…4). The large drop in E x at 12 O can hardly be explained by the Coulomb shift only, where typical downward shifts for excited states are estimated to be 1 MeV or less [37]. The present observation thus suggests the important role of the proton-neutron monopole interaction as an isospin symmetric mechanism for shell evolution.…”

Section: Prl 103 152503 (2009) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 52%

Breakdown of theZ=8Shell Closure in UnboundO12and its Mirror Symmetry

Suzuki¹,

Iwasaki²,

Beaumel³

et al. 2009

Phys. Rev. Lett.

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An excited state in the proton-rich unbound nucleus 12 O was identified at 1.8(4) MeV via missing-mass spectroscopy with the 14 Oðp; tÞ reaction at 51 AMeV. The spin-parity of the state was determined to be 0 þ or 2 þ by comparing the measured differential cross sections with distorted-wave calculations. The lowered location of the excited state in 12 O indicates the breakdown of the major shell closure at Z ¼ 8 near the proton drip line. This demonstrates the persistence of mirror symmetry in the disappearance of the magic number 8 between 12 O and its mirror partner 12 Be. DOI: 10.1103/PhysRevLett.103.152503 PACS numbers: 25.40.Hs, 21.10.Hw, 24.10.Eq, 27.20.+n Symmetry and its breaking have played an important role in physics. The CP violation in particle physics led to the discovery of the third generation of quarks [1]; superconductivity of solid states is a manifestation of the gauge symmetry breaking in electron motion [2].Mirror symmetry in atomic nuclei is a unique feature of the two-fermionic quantum system comprised of protons and neutrons. Because of the charge invariance of the nuclear force, ''mirror'' nuclei, a pair of nuclei where numbers of protons and neutrons are interchanged, show a marked similarity in their level schemes. However, the presence of the strong Coulomb field in the proton-rich mirror partner can degrade the symmetry, enhancing complex but rich aspects of the finite system.The increasing availability of radioactive ion (RI) beams opens new possibilities to test mirror symmetry among nuclei with large isospin even beyond the drip lines. The isospin degree of freedom of the nuclear shell structure makes a sharp contrast to other quantum systems such as the quantum dots [3] and the metal clusters [4], where the electromagnetic or spatial degree of freedom is employed in manipulating the shell structure. Recent experimental studies on exotic nuclei have shown that the conventional magic numbers disappear in the neutron-rich regions at N ¼ 8, 20 and 28 [5][6][7][8][9][10][11], and possibly in superheavy elements [12]. Theoretical works point to various underlying mechanisms in terms of the isospin-dependent part of the nuclear effective interaction [13,14], reduction of the spin-orbit potential [15], coupling to the continuum [16], and deformation [17] or clustering [18,19]. However, the validity of the mirror symmetry of these effects at extreme conditions of isospin and binding energies remains an open question, limiting predictions for very proton-rich nuclei. The present Letter presents a study of shell quenching at Z ¼ 8 in the proton-unbound nucleus 12 O. Mirror symmetry in the shell quenching phenomena between 12 8 O 4 and its mirror partner 12 4 Be 8 is investigated experimentally from the low-lying excitation properties.We studied the structure of 12 O via missing-mass spectroscopy with the 14 Oðp; tÞ reaction at 51 AMeV. The systematics of the low-lying excited states in even-even nuclei provides a sensitive probe for the evolution of the shell structure. In 12 Be, the a...

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Section: Prl 103 152503 (2009) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 52%

Breakdown of theZ=8Shell Closure in UnboundO12and its Mirror Symmetry

Suzuki¹,

Iwasaki²,

Beaumel³

et al. 2009

Phys. Rev. Lett.

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“…Strong 1 S correlations between protons in the analog 10 C state and any rotational states built on this band-head, such as the 2 + , are to be expected. We point out that if the peak observed at 4.2 MeV by Curtis et al [15] were the 0 + 2 band head, it is 0.8 MeV too low to be consistent with the analysis of Fortune and Sherr [16]. Barker [35] has also concluded that a state at 4.2 MeV is unlikely to be the 0 + 2 state [35].…”

Section: (G)]mentioning

confidence: 82%

“…This subset provides strong evidence for a decay with significant 1 S proton-proton correlations. Decays such as this present a reflection of 1 S correlations in the parent as does knock-out work, e.g., 16 O(e, e pp) 14 C g.s. [36].…”

Section: (G)]mentioning

confidence: 99%

“…We repeated the experiment, tripling the statistics, and it is the combined results that we now present. Since the reporting of our initial work, Curtis et al [16] have investigated 10 C states via inelastic scattering at E/A = 30 MeV [15]. Their work suggests a level at 4.2 MeV, which they speculate is the long sought after excited 0 + 2 state.…”

mentioning

confidence: 99%

“…Excellent cases for sequential decay (e.g., 12 O [4]) and nearly uniform sampling of three-body phase space (e.g., 6 Be g.s. [5][6][7], 16 Ne, 19 Mg [8,9], and 45 Fe [10]) exist. The 45 Fe case is a beautiful example of the single-particle orbital angular momentum of the protons in the parent being impressed on the three-body dynamics [10].…”

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confidence: 99%

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Correlated two-proton decay fromC10

et al. 2008

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The decay of 10 C excited states to the 2p + 2α exit channel has been studied using inelastic excitation of a secondary 10 C beam. The decay sequences leading to the 2p + 2α final state are determined for the previously known levels and for a newly found level at E * = 8.4 MeV. A state at E * = 6.57 MeV is shown to undergo two-proton decay to 8 Be g.s. with strong p-p correlations consistent with the 1 S phase shift. Based on the lack of such correlations for other two-proton decays, this indicates that the correlations are associated with structure of the parent level.

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Energy levels for Be-12 (Beryllium-12)

Sukhoruchkin¹,

Soroko²

2008

Tables of Excitations of Proton- And Neutron-Rich Unstable Nuclei

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Excited0+,T=2states inBe

Cited by 50 publications

References 18 publications

Breakdown of theZ=8Shell Closure in UnboundO12and its Mirror Symmetry

Breakdown of theZ=8Shell Closure in UnboundO12and its Mirror Symmetry

Correlated two-proton decay fromC10

Energy levels for Be-12 (Beryllium-12)

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