Merging of the islands of inversion at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>20</mml:mn></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>28</mml:mn></mml:mrow></mml:math>

Caurier, E.; Nowacki, F.; Poves, A.

doi:10.1103/physrevc.90.014302

Cited by 171 publications

(242 citation statements)

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“…As a starting point we take the unperturbed values, based on the large-scale shell model calculations of Ref. [7], to be e 0 = 1.4 MeV, e 2 = 0.2 MeV and e 4 = 0 MeV.…”

Section: The Approachmentioning

confidence: 99%

“…Large scale shell-model calculations [7] however, predict the coexistence of 0p0h, 2p2h and 4p4h states in the low-lying excitation spectra of the N ∼ 20 Mg nuclei, calling into question the validity of a two-level approach. Inspired by these results, we have revisited the analysis of Fortune [5,8], extending it now to a three-level mixing.…”

Section: Introductionmentioning

confidence: 99%

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TheMg30(t,p)Mg32“puzzle” reexamined

et al. 2016

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We propose a phenomenological three-level mixing model of unperturbed 0p0h, 2p2h and 4p4h states, to describe the low-lying 0 + states in 32 Mg. Within this approach, self-consistent solutions exist that provides good agreement with the available experimental information obtained from the 30 Mg(t,p) 32 Mg reaction. The inclusion of the third state, namely the 4p4h configuration, resolves the "puzzle" that results from a two-level model interpretation of the same data. In our analysis, the 32 Mg ground state emerges naturally as dominated by intruder (2p2h and 4p4h) configurations, at the 95% level.

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“…As a starting point we take the unperturbed values, based on the large-scale shell model calculations of Ref. [7], to be e 0 = 1.4 MeV, e 2 = 0.2 MeV and e 4 = 0 MeV.…”

Section: The Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

TheMg30(t,p)Mg32“puzzle” reexamined

et al. 2016

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“…In 1979 Simons et al [13] first identified the neutron-rich nucleus 35 Al produced in fragmentation of 40 Ar. Four decades later, except for some theoretical calculations [14][15][16][17][18], limited experimental information regarding the ground-state configuration of 35 Al is available. The ground-state information of a nucleus gives direct insight into the wave function.…”

Section: Introductionmentioning

confidence: 99%

Ground-state configuration of neutron-rich Al35 via Coulomb breakup

Chakraborty¹,

Pramanik²,

Aumann³

et al. 2017

Phys. Rev. C

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The ground-state configuration of 35 Al has been studied via Coulomb dissociation (CD) using the LAND-FRS setup (GSI, Darmstadt) at a relativistic energy of ∼403 MeV/nucleon. The measured inclusive differential CD cross section for 35 Al, integrated up to 5.0 MeV relative energy between the 34 Al core and the neutron using a Pb target, is 78(13) mb. The exclusive measured CD cross section that populates various excited states of 34 Al is 29(7) mb. The differential CD cross section of 35 Al → 34 Al + n has been interpreted in the light of a direct breakup model, and it suggests that the possible ground-state spin and parity of 35 Al could be, tentatively, 1/2 + or 3/2 + or 5/2 + . The valence neutrons, in the ground state of 35 Al, may occupy a combination of either l = 3,0 or l = 1,2 orbitals coupled with the 34 Al core in the ground and isomeric state(s), respectively. This hints of a particle-hole configuration of the neutron across the magic shell gaps at N = 20,28 which suggests narrowing the magic shell gap. If the 5/2 + is the ground-state spin-parity of 35 Al as suggested in the literature, then the major ground-state configuration of 35 Al is a combination of 34 Al(g.s.; 4 − ) ⊗ ν p 3/2 and 34 Al(isomer; 1 + ) ⊗ ν d 3/2 states. The result from this experiment has been compared with that from a previous knockout measurement and a calculation using the SDPF-M interaction.

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“…Recently intruder configurations are found in the neutron rich nuclei around this shell gap [3,4,5,6,7]. Thus the nuclear structure study of these nuclei in this region is very important [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

Kumar

Srivastava

2016

J. Phys. G: Nucl. Part. Phys.

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Abstract. In the present work we calculate the allowed β − -decay half-lives of nuclei with Z = 20 − 30 and N ≤ 50 systematically under the framework of the nuclear shell model. A recent study shows that some nuclei in this region belong to the island of inversion. We perform calculation for f p shell nuclei using KB3G effective interaction. In the case of Ni, Cu, and Zn, we used JUN45 effective interaction. Theoretical results of Q values, half-lives, excitation energies, logf t values, and branching fractions are discussed and compared with the experimental data. In the Ni region, we also compared our calculated results with recent experimental data [Z. Y. Xu et al., Phys. Rev. Lett. 113, 032505, 2014]. Present results agree with the experimental data of half-lives in comparison to QRPA. Nuclear β − -decay half-lives for f p and f pg shell nuclei 2 IntroductionThe neutron density becomes very diffused and the single-particle spectrum shows the similarity of the harmonic-oscillator as we approach towards the neutron-drip line [1,2]. We can see this effect at N = 40 shell gap. Recently intruder configurations are found in the neutron rich nuclei around this shell gap [3,4,5,6,7]. Thus the nuclear structure study of these nuclei in this region is very important [8,9,10].Sorlin et al. Using RIBF facility at RIKEN, the half-lives of twenty neutron-rich nuclei with Z = 27 − 30 are reported in ref. [14]. In that work, sizable magicity was reported for both the proton number Z = 28 and the neutron number N = 50 in 78 Ni. A sudden shortening of half-lives of the nickel isotopes beyond N = 50 were observed in this work, although this effect is not found in the Cu-Ge-Ga chains. The half-lives results from LISE2000 spectrometer at GANIL for 71 Co and 73 Co are reported in ref.[15]. The half-lives of 77,78 Ni were measured for the first time by Hosmer et al. [16], at NSCL, MSU. Recently the beta decay half-lives of 38 very neutron-rich Kr to Tc isotopes are measured at RIKEN [17].Despite the progress in the experimental side, we need theoretical estimates for half-lives of neutron rich nuclei, especially those belonging to the island of inversion. These calculations are based on allowed GT-transitions. Many theoretical calculations from the quasiparticle random phase approximation (QRPA) based on the HartreeFock Bogoliubov theory [18] or other global models [19,20,21] are available in the literature. These calculations underestimate the correlation among nucleons which predict GT-strength at low-energies. Recently, shell model calculations for the β − -decays of Z = 9 − 13 nuclei are reported by Li and Ren [22]. The motivation of the present work is to study β − -decay properties of Z = 20 − 30 nuclei using the nuclear shell model. This paper is organized as follows. In section 2, we present the formulas for the calculation of β − decay half-lives. Shell model spaces, effective interactions and the quenching factors adopted in our calculations are reported in section 3. In section 4, we present theoretical results along w...

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Merging of the islands of inversion atN=20andN=28

Cited by 171 publications

References 91 publications

TheMg30(t,p)Mg32“puzzle” reexamined

TheMg30(t,p)Mg32“puzzle” reexamined

Ground-state configuration of neutron-rich Al35 via Coulomb breakup

Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

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Merging of the islands of inversion atN=20andN=28

Cited by 171 publications

References 91 publications

TheMg30(t,p)Mg32“puzzle” reexamined

TheMg30(t,p)Mg32“puzzle” reexamined

Ground-state configuration of neutron-rich Al35 via Coulomb breakup

Nuclearβ−-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei

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Nuclearβ⁻-decay half-lives for ${fp}$ and ${fpg}$ shell nuclei