Rotational band structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Mg</mml:mi><mml:mprescripts /><mml:none /><mml:mn>32</mml:mn></mml:mmultiscripts></mml:math>

Crawford, H. L.; Fallon, P.; Macchiavelli, A. O.; Poves, A.; Bader, V. M.; Bazin, D.; Bowry, M.; Campbell, C. M.; Carpenter, M. P.; Clark, R. M.; Cromaz, M.; Gade, A.; Ideguchi, E.; Iwasaki, H.; Langer, C.; Lee, I. Y.; Loelius, C.; Lunderberg, E.; Morse, C.; Richard, A.; Rissanen, J.; Smalley, D.; Stroberg, S. R.; Weißhaar, D.; Whitmore, K.; Wiens, A.; Williams, S. J.; Wimmer, K.; Yamamato, T.

doi:10.1103/physrevc.93.031303

Cited by 29 publications

(44 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For a deformation of 2 ≈ 0.4, in line with the analysis in Ref. [25], such a standard Nilsson description yields amplitudes: C 3/2,1 = -0.32, C 7/2,3 = 0.92, and C 5/2,3 = -0.22, which fail to reproduce the measured spectroscopic factors (see Table I). In particular, we note the fact that the large amplitude of the f 7/2 orbit would be consistent with a trend favoring the knockout to the 4 + member of the ground-state rotational band, clearly not observed in either of the recent experiments.…”

Section: The Methodssupporting

confidence: 66%

Spectroscopic factors in the N=20 island of inversion: The Nilsson strong-coupling limit

et al. 2017

Self Cite

View full text Add to dashboard Cite

Spectroscopic factors, extracted from one-neutron knockout and Coulomb dissociation reactions, for transitions from the ground state of 33 Mg to the ground-state rotational band in 32 Mg, and from 32 Mg to low-lying negative parity states in 31 Mg, are interpreted within the rotational model. Associating the ground state of 33 Mg and the negative parity states in 31 Mg with the 3 2 [321] Nilsson level, the strong coupling limit gives simple expressions that relate the amplitudes (C j ) of this wavefunction with the measured cross-sections and derived spectroscopic factors (S j ). To obtain a consistent agreement with the data within this framework, we find that one requires a modified 3 2 [321] wavefunction with an increased contribution from the spherical 2p 3/2 orbit as compared to a standard Nilsson calculation. This is consistent with the findings of large scale Shell Model calculations and can be traced to weak binding effects that lower the energy of low-orbitals.

show abstract

Section: The Methodssupporting

confidence: 66%

Spectroscopic factors in the N=20 island of inversion: The Nilsson strong-coupling limit

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…51. Aside from the previously known γ-ray transitions at 885 keV and 1438 keV that are attributed to the 2 + 1 → 0 + 1 and 4 + 1 → 2 + 1 transitions, respectively, a new transition at 1773 keV was observed that is proposed to connect the 6 + 1 and 4 + 1 states (Crawford et al, 2016). With 32 Mg suspected to be well-deformed, this (Tsunoda et al, 2017).…”

Section: Excitation Energymentioning

confidence: 82%

“…The most recent spectroscopy inside the N = 20 IoI addressed one of the hallmark nuclei in this region of shell evolution, 32 Mg, that has been subject to experimental study since its low-lying 2 + 1 energy contradicted the presence of the N = 20 magic number in this isotopic chain (Détraz et al, 1979). Using the advanced γ-ray tracking array GRETINA (Paschalis et al, 2013), excited states in 32 Mg (Crawford et al, 2016) were populated in the secondary fragmentation of an 46 Ar rareisotope beam at NSCL. The γ rays spectrum is displayed in Fig.…”

Section: Excitation Energymentioning

confidence: 99%

See 1 more Smart Citation

Evolution of shell structure in exotic nuclei

et al. 2020

View full text Add to dashboard Cite

The atomic nucleus is a quantum many-body system whose constituent nucleons (protons and neutrons) are subject to complex nucleon-nucleon interactions that include spin-and isospin-dependent components. For stable nuclei, already several decades ago, emerging seemingly regular patterns in some observables could be described successfully within a shell-model picture that results in particularly stable nuclei at certain magic fillings of the shells with protons and/or neutrons: N,Z = 8, 20, 28, 50, 82, 126. However, in short-lived, so-called exotic nuclei or rare isotopes, characterized by a large N/Z asymmetry and located far away from the valley of beta stability on the nuclear chart, these magic numbers, viewed through observables, were shown to change. These changes in the regime of exotic nuclei offer an unprecedented view at the roles of the various components of the nuclear force when theoretical descriptions are confronted with experimental data on exotic nuclei where certain effects are enhanced. This article reviews the driving forces behind shell evolution from a theoretical point of view and connects this to experimental signatures.

show abstract

“…[3] for a review and more recent references given below). From these studies it has been conjectured that magicity persists along the N = 20 isotonic chain from 40 Ca (Z = 20) down to 34 Si (N = 14) [15][16][17][18] and suddenly disappears only two protons below in the deformed nuclide 32 Mg [19]. The recent experimental characterization of the 0 + 1,2 states in 32 Mg [20] and 34 Si [21] have provided further support for this description in which a crossing between the normal and the intruder regimes occurs between these two nuclei [22].…”

mentioning

confidence: 99%

Identification of the crossing point at N=21 between normal and intruder configurations

Lică¹,

Rotaru²,

Borge³

et al. 2017

Phys. Rev. C

Self Cite

View full text Add to dashboard Cite

The β − decay of 34 Mg was used to study the 34 Al nucleus through γ spectroscopy at the Isotope Separator On-Line facility of CERN. Previous studies identified two β-decaying states in 34 Al having spin-parity assignments J π = 4 − dominated by the normal configuration π (d 5/2) −1 ⊗ ν(f 7/2) and J π = 1 + by the intruder configuration π (d 5/2) −1 ⊗ ν(d 3/2) −1 (f 7/2) 2. Their unknown ordering and relative energy have been the subject of debate for the placement of 34 Al inside or outside the N = 20 "island of inversion." We report here that the 1 + intruder lies only 46.6 keV above the 4 − ground state. In addition, a new half-life of T 1/2 = 44.9(4) ms, that is twice as long as the previously measured 20(10) ms, has been determined for 34 Mg. Large-scale shell-model calculations with the recently developed SDPF-U-MIX interaction are compared with the new data and used to interpret the mechanisms at play at the very border of the N = 20 island of inversion.

show abstract

Rotational band structure inMg32

Cited by 29 publications

References 32 publications

Spectroscopic factors in the N=20 island of inversion: The Nilsson strong-coupling limit

Spectroscopic factors in the N=20 island of inversion: The Nilsson strong-coupling limit

Evolution of shell structure in exotic nuclei

Identification of the crossing point at N=21 between normal and intruder configurations

Contact Info

Product

Resources

About