34Si: A new doubly magic nucleus?

Baumann, P.; Huck, Alexander; Klotz, G.; Knipper, A.; Walter, G.; Marguier, G.; Ravn, H.L.; Richard‐Serre, C.; Poves, A.; Retamosa, J.

doi:10.1016/0370-2693(89)90974-x

Cited by 73 publications

(66 citation statements)

References 16 publications

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“…While it has been rather difficult to obtain unbound 26,28 O and bound 29 F, a solution appeared naturally in the present work in a general framework for stable and exotic nuclei. Although the ground states primarily comprise the 2p2h configurations in nuclei such as 31 Na and 32 Mg consistently with the island of inversion model, the mixing of 4p4h and higher intruder states is en- hanced by the narrowing of the shell gap in some other nuclei.…”

mentioning

confidence: 99%

“…The energy gain due to valence nucleon interactions is present only for 27 F, and cancels and probably overcomes the gain in 29 F by putting two more neutrons in 0d 3/2 which is only moderately deep. Thus, with the Nϭ20 magic structure, it is very unlikely to have unbound 26,28 O and bound 29 F. Indeed, Fig. 3͑a͒ indicates that 29 F is not bound in the 0p0h calculation.…”

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confidence: 99%

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Extreme location of F drip line and disappearance of theN=20magic structure

et al. 2001

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confidence: 99%

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confidence: 99%

Extreme location of F drip line and disappearance of theN=20magic structure

et al. 2001

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“…The region of those nuclei, the ground state of which is dominantly an intruder configuration while their normal configuration ground state is found as an excited state, is called an ''island of inversion''. Nuclei around 32 Mg were proposed first to form such an island of inversion [8][9][10]. It has been demonstrated in a recent evaluation of the experimental data of 31 Mg and 33 Mg [11] that their ground state wave function is indeed dominated by two neutrons excitations into the pf orbits.…”

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confidence: 99%

“…In 1949, Mayer, Haxel, Suess, and Jensen [1,2] independently gave a description of the observed shell gaps at nucleon numbers 2,8,20,28,50,82, and 126 in terms of mean field potential including the spin-orbit interaction. With this model, these special numbers-renamed ''magic numbers''-as well as the properties of the related nuclei observed at that time such as spin, magnetic moments, discontinuities in binding energies, and -decay systematics could be explained.…”

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Unveiling the Intruder Deformed02+State inSi34

et al. 2012

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The 0 þ 2 state in 34 Si has been populated at the GANIL-LISE3 facility through the decay of a newly discovered 1 þ isomer in 34 Al of 26(1) ms half-life. The simultaneous detection of e þ e À pairs allowed the determination of the excitation energy Eð0 þ 2 Þ ¼ 2719ð3Þ keV and the half-life T 1=2 ¼ 19:4ð7Þ ns, from which an electric monopole strength of 2 ðE0Þ ¼ 13:0ð0:9Þ Â 10 À3 was deduced. The 2 þ 1 state is observed to decay both to the 0 þ 1 ground state and to the newly observed 0 þ 2 state [via a 607(2) keV transition] with a ratio Rð2Gathering all information, a weak mixing with the 0 þ 1 and a large deformation parameter of ¼ 0:29ð4Þ are found for the 0 þ 2 state, in good agreement with shell model calculations using a new SDPF-U-MIX interaction allowing np-nh excitations across the N ¼ 20 shell gap.

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“…In particular, 34 Si, the first even-even N = 20 nucleus outside the "island of inversion", with just two more protons compared to the well deformed 32 Mg, has attracted much interest [6,7,8,9,10,11,12]. Its ground state has been found to be spherical [10], while the first 2 + state is suggested to be of deformed 2hω pf -shell nature [7]. The deformed 0 + state, which in 32 Mg is the ground state, is expected to be a low lying excitation in N = 20, even-Z nuclei outside the island of inversion.…”

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The deformed 0⁺state in³⁴Si

Paschalis¹,

Fallon²,

Macchiavelli³

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. The energy of the lowest deformed 2-particle 2-hole (2p2h) 0 + state in even-even N = 20 nuclei is a key observable directly related to the size of the neutron N = 20 shell closure. 34 Si, with 14 protons and 20 neutrons, lies at the boundary of the "island of inversion", where the deformed 2p2h 0 + state is the ground state in even-A nuclei. In 34 Si, the 2p2h 0 + state is expected to be particularly low lying -in some theories it is even predicted to lie below the first 2 + state. While there have been a number of attempts, using various techniques, no experiment to date has been able to firmly locate the 34 Si 2p2h 0 + state although a number of candidates have been suggested. Here we present, for the first time, data obtained from a fusion-evaporation reaction 18 O( 18 O, 2p) to produce 34 Si. Gammasphere and Microball were used to detect γ-γ coincidences and charged particles (two protons), respectively. The increased sensitivity of this experiment using γ-γ coincidences and a high charged-particle detection efficiency helped to exclude previously reported candidates and provided a stringent limit on the anticipated γ decay from the first 2 + state to the 2p2h 0 + state.

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34Si: A new doubly magic nucleus?

Cited by 73 publications

References 16 publications

Extreme location of F drip line and disappearance of theN=20magic structure

Extreme location of F drip line and disappearance of theN=20magic structure

Unveiling the Intruder Deformed02+State inSi34

The deformed 0⁺state in³⁴Si

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34Si: A new doubly magic nucleus?

Cited by 73 publications

References 16 publications

Extreme location of F drip line and disappearance of theN=20magic structure

Extreme location of F drip line and disappearance of theN=20magic structure

Unveiling the Intruder Deformed02+State inSi34

The deformed 0+state in34Si

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Product

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The deformed 0⁺state in³⁴Si