Cross-shell excitations in 30Al and 30Si at high spin

Steppenbeck, D.; Deacon, A. N.; Freeman, S. J.; Janssens, R. V. F.; Carpenter, M. P.; Hoffman, C. R.; Kay, B. P.; Lauritsen, T.; Lister, C. J.; O’Donnell, D.; Ollier, J.; Seweryniak, D.; Smith, J. F.; Spohr, K.; Tabor, S. L.; Tripathi, Vandana; Wady, P.

doi:10.1016/j.nuclphysa.2010.07.010

Cited by 15 publications

(38 citation statements)

References 39 publications

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“…Such an extension is of significance because the N ∼ 20 nuclei [1,2,4,7] have been investigated, both experimentally and theoretically, with specific motivation to explore the effects of intruder states from the fp shells on their a Calculated using Equation (3) b Calculated using Equation (4) level structure. It is expected that these configurations would dominate the level structures at much lower excitation energies than the general expectation.…”

Section: Re-examining Shell Model Calculations In 30 Simentioning

confidence: 99%

“…Previously, the shell model calculations for the 30 Si nucleus have been carried out by Steppenbeck et al [7] using the U SD, U SDA and U SDB interactions for the positive parity states and the W BP and the W BP − a interactions for the negative parity states. They reported a satisfactory reproduction of the positive parity states in these calculations.…”

Section: Re-examining Shell Model Calculations In 30 Simentioning

confidence: 99%

“…Further, the predicted negative parity states in 30 Si, are in reasonable agreement with the observed level sequences. Interestingly, the calculations did not require any system dependent lowering of the single-particle energies of the f 7/2 and the p 3/2 orbitals as was found necessary in the previous studies [7,21,22]. Ref.…”

Section: Introductionmentioning

confidence: 98%

“…The associated theoretical studies have also been zealously pursued in conjunction with the experimental endeavours, particularly within the purview of the nuclear shell model. Shell model calculations in this region have resorted to adhoc adjustments [7] in the single particle energies while calculations with updated interactions [8] and reasonable configuration space have indicated such modifications to be inessential [9].…”

Section: Introductionmentioning

confidence: 99%

“…The results have been compared with shell model calculations using updated interactions and larger model spaces and are found to be in close agreement. The large basis shell model calculations, have been extended to the neighbouring 28,30 Si nuclei [7,20] for a comparative interpretation. The calculations for 28 Si could satisfactory reproduce the deformed states reported previously by Jenkins et al [20].…”

Section: Introductionmentioning

confidence: 99%

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Spectroscopy and shell model calculations in Si isotopes

Bhattacharjee

Raut

et al. 2015

Phys. Rev. C

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The 29 Si nucleus has been studied using heavy-ion induced fusion-evaporation reaction and, for the first time, using a large array of high resolution γ-ray detectors. High spin states of the nucleus have been populated using 18 O( 16 O,αn) and 18 O( 13 C,2n) reactions at E lab = 30-34 MeV. Previously reported levels have been confirmed and a new level has been identified in the present study. Spin-parity assignments have been carried out based on the anisotropy and polarization measurements of the observed γ-transitions. Level lifetimes have been measured using Doppler Shift Attenuation Method (DSAM), with modified analysis techniques for the thick molecular target (Ta2O5) used in the present setup. Lifetime of the lowest negative parity state at Ex = 3624 keV has been substantially modified from the previously reported value. Large basis shell model calculations have been carried out for the nucleus using updated interactions and the results corroborate the experimental findings. The calculations have also been carried out for the neighbouring 28,30 Si isotopes. In case of the 28 Si nucleus, the calculations adequately reproduce most of the deformed structures, as represented by the quadrupole moments extracted therefrom. In the 30 Si nucleus, the negative parity states have been reproduced for the first time without any ad hoc lowering of the single particle energies. It can be generally stated that the shell model calculations adequately describe the experimental observations in these nuclei.

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Section: Re-examining Shell Model Calculations In 30 Simentioning

confidence: 99%

Section: Re-examining Shell Model Calculations In 30 Simentioning

confidence: 99%