Structure of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>27</mml:mn></mml:mrow></mml:math>isotones derived from the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ar</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>44</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"

Gaudefroy, L.; Sorlin, O.; Nowacki, F.; Beaumel, D.; Blumenfeld, Y.; Dombrádi, Zs.; Fortier, S.; Franchoo, S.; Grévy, S.; Hammache, F.; Kemper, K. W.; Kratz, K. L.; Laurent, Marie-Hélène; Lukyanov, S. M.; Nalpas, L.; Ostrowski, A. N.; Penionzhkevich, Yu. É.; Pollacco, E. C.; Roussel, Pierre; Roussel‐Chomaz, P.; Sohler, D.; Stănoiu, M.; Tryggestad, E.

doi:10.1103/physrevc.78.034307

Cited by 41 publications

(58 citation statements)

References 44 publications

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“…In the calculation, there is some mixing of the rotational 7/2 − state with the neutron-hole 7/2 − states, although this results in only a modest spectroscopic factor (C 2 S = 0.36). This result is similar to that given by Gaudefroy et al [14]. Of course, the rotational 5/2 − state does not have a significant spectroscopic factor because the f 5/2 neutron strength is at a much higher energy.…”

Section: -3supporting

confidence: 81%

“…Thus, the "inversion" that results in the deformed 3/2 − ground state in 43 S should be even stronger in 41 Si. In contrast, the ground state in 45 Ar appears to be dominated by the spherical f 7/2 neutron-hole configuration [14].…”

Section: -3mentioning

confidence: 96%

“…[14] argued that the primary factor driving the deformed 3/2 − state to be the 43 S ground state, below the spherical 7/2 − state, is the correlation energy of the 3/2 − state. Using the shell model, these authors calculate that the correlation energy increases with decreasing proton number along the N = 27 isotone chain.…”

Section: -3mentioning

confidence: 99%

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Rotational and neutron-hole states inS43via the neutron knockout and fragmentation reactions

et al. 2009

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The recent assertion that shape coexistence occurs in the neutron-rich isotope 43 S implies that a state observed at 940 keV in a previous study is a rotational excitation of the deformed ground state. Here we use results from two intermediate-energy reactions to demonstrate that this state-assigned an energy of 971 keV in the present work-is indeed a rotational state. This result strengthens the case for shape coexistence in 43 The neutron-rich nuclei in the vicinity of 44 S presently provide a critical testing ground for the idea that neutron shell structure is significantly different close to the neutron dripline than it is in the valley of stability. Gaudefroy et al. [1] recently published the results of a g-factor measurement of an isomer in 43 S at 320 keV and argued on the basis of their result that spherical and deformed shapes coexist in that nucleus.Gaudefroy et al. interpret the 320 keV isomer as a spherical f 7/2 single-neutron hole state (with J π = 7/2 − ), and assign the ground state J π = 3/2 − on the basis of the E2 transition deexciting the isomer. They further argue that the ground state must be deformed to have this J π value. Finally, they suggest that a state observed by Ibbotson et al. [2] and assigned an energy of 940 keV is a J π = 7/2 − rotational excitation of the ground state. In the present work, we report on a test of this interpretation of the state observed by Ibbotson et al. using both the direct single-neutron knockout reaction 9 Be( 44 S, 43 S)X and the reaction 9 Be( 45 Cl, 43 S)X. The latter involves both direct and nondirect removal of a neutron and proton, and is referred to here as a fragmentation reaction. The relatively small cross sections for population of this state observed in these reactions supports its interpretation as a rotational excitation built on the ground state and strengthens the case for shape coexistence in 43 S.The experiment was performed at the Coupled-Cyclotron Facility of the National Superconducting Cyclotron Laboratory at Michigan State University. A cocktail beam comprising 84% 44 S and 14% 45 Cl was produced by fragmentation of a 140 MeV/nucleon 48 Ca primary beam incident on a 705 mg/cm 2 9 Be fragmentation target. Components of the secondary beam were separated in the A1900 fragment separator [3] and delivered to a 376 mg/cm 2 thick 9 Be reaction target mounted at the target position of the S800 magnetic spectrograph [4]. In the one-neutron knockout measurement, 1.5 × 10 8 44 S beam particles were incident on the reaction target. The midtarget beam energy was 92 MeV/nucleon. The fragmentation measurement was performed with a total of 1.6 × 10 8 45 Cl beam particles and a midtarget beam energy of 98 MeV/nucleon. Incoming beam particles were identified from their time-of-flight difference measured between scintillators mounted at the extended focal plane of the A1900 and at the object of the S800 analysis line. Projectile-like reaction products were identified by the time of flight to the focal plane of the S800 and energy loss in the S800 i...

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Section: -3supporting

confidence: 81%

Section: -3mentioning

confidence: 96%

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Rotational and neutron-hole states inS43via the neutron knockout and fragmentation reactions

et al. 2009

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“…Transfer reactions induced by radioactive beams on deuterium targets are a powerful means for extracting nuclear structure information [15][16][17][18][19]. The spectroscopic information determined from these measurements are the excitation energies and the transferred angular momentum required to populate a given level in 19 Ne and 19 F. The angular distributions were compared to DWBA calculations to extract spectroscopic factors for all the wellpopulated states in the two nuclei.…”

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confidence: 99%

Single-nucleon transfer reactions on18F

et al. 2011

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“…One of the interesting examples is the N = 28 shell gap which is known to be quenched in the vicinity of 44 S and which has been given considerable experimental [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and theoretical attention [22][23][24][25][26][27][28][29][30][31][32]. Since the the orbital angular momenta of f 7/2 and p 3/2 differ by two, the quench of the N = 28 shell gap will lead to the strong quadrupole correlation of neutrons.…”

Section: Introductionmentioning

confidence: 99%

Low-lying2+states generated bypn-quadrupole correlation andN=28shell quenching

Ebata

Kimura

2015

Phys. Rev. C

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The quadrupole vibrational modes of neutron-rich N = 28 isotones ( 48 Ca, 46 Ar, 44 S, and 42 Si) are investigated by using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory with several choice of energy density functionals, including nuclear pairing correlation. It is found that the quenching of the N = 28 shell gap and the proton holes in the sd shell trigger quadrupole correlation and increase the collectivity of the low-lying 2 + state in 46 Ar. It is also found that the pairing correlation plays an important role to increase the collectivity. We also demonstrate that the same mechanism to enhance the low-lying collectivity applies to other N = 28 isotones 44 S and 42 Si, and it generates a couple of low-lying 2 + states which can be associated with the observed 2 + states.

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Structure of theN=27isotones derived from theAr44(

Cited by 41 publications

References 44 publications

Rotational and neutron-hole states inS43via the neutron knockout and fragmentation reactions

Rotational and neutron-hole states inS43via the neutron knockout and fragmentation reactions

Single-nucleon transfer reactions on18F

Low-lying2+states generated bypn-quadrupole correlation andN=28shell quenching

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