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

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

doi:10.1016/j.nuclphysa.2010.07.010

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

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

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Yrast and near-yrast states in Al-30 and Si-30 have been populated to high spin with the O-18+ C-14 fusion-evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J similar to 9h at 9.4 and 15.5 MeV, respectively. Their decay schemes indicate that cross-shell excitations dominate at high spin, where negative-parity structures exist. Positive-parity states are compared to the results of shell-model calculations using the USD, USDA, and USDB effective interactions. The negative-parity levels are compared to predictions of the W BP interaction and the recently-developed WBP-a Hamiltonian, by allowing 1p-1h excitations to fp-shell orbitals. The results suggest that single-neutron excitations to the 0f(7/2) orbital play a significant role at high spin. (C) 2010 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	149-167
Number of pages	19
Journal	Nuclear Physics A
Volume	847
Issue number	3-4
DOIs	https://doi.org/10.1016/j.nuclphysa.2010.07.010
Publication status	Published - 8 Dec 2010

Keywords

NUCLEAR REACTIONS C-14(O-18, X), E=37 MeV
measured E-gamma, I-gamma, (residue)gamma-, gamma gamma-coin, gamma(theta), DCO ratios using the Gammasphere array and Fragment Mass Analyzer, Al-30, Si-30
deduced levels, J, pi, multipolarities, Comparison with shell-model calculations

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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., Oilier, J., Seweryniak, D., Smith, J. F., Spohr, K. .-M., Tabor, S. L., Tripathi, V., Wady, P. T., & Zhu, S. (2010). Cross-shell excitations in Al-30 and Si-30 at high spin. Nuclear Physics A, 847(3-4), 149-167. https://doi.org/10.1016/j.nuclphysa.2010.07.010

@article{0b38702578ed4da88114096f069b4871,

title = "Cross-shell excitations in Al-30 and Si-30 at high spin",

abstract = "Yrast and near-yrast states in Al-30 and Si-30 have been populated to high spin with the O-18+ C-14 fusion-evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J similar to 9h at 9.4 and 15.5 MeV, respectively. Their decay schemes indicate that cross-shell excitations dominate at high spin, where negative-parity structures exist. Positive-parity states are compared to the results of shell-model calculations using the USD, USDA, and USDB effective interactions. The negative-parity levels are compared to predictions of the W BP interaction and the recently-developed WBP-a Hamiltonian, by allowing 1p-1h excitations to fp-shell orbitals. The results suggest that single-neutron excitations to the 0f(7/2) orbital play a significant role at high spin. (C) 2010 Elsevier B.V. All rights reserved.",

keywords = "NUCLEAR REACTIONS C-14(O-18, X), E=37 MeV, measured E-gamma, I-gamma, (residue)gamma-, gamma gamma-coin, gamma(theta), DCO ratios using the Gammasphere array and Fragment Mass Analyzer, Al-30, Si-30, deduced levels, J, pi, multipolarities, Comparison with shell-model calculations",

author = "D. Steppenbeck and Deacon, {A. N.} and Freeman, {S. J.} and Janssens, {R. V. F.} and Carpenter, {M. P.} and Hoffman, {C. R.} and Kay, {B. P.} and T. Lauritsen and Lister, {C. J.} and D. O'Donnell and J. Oilier and D. Seweryniak and Smith, {J. F.} and Spohr, {K. -M.} and Tabor, {S. L.} and V. Tripathi and Wady, {P. T.} and S. Zhu",

year = "2010",

month = dec,

day = "8",

doi = "10.1016/j.nuclphysa.2010.07.010",

language = "English",

volume = "847",

pages = "149--167",

journal = "Nuclear Physics A",

issn = "0375-9474",

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Steppenbeck, D, Deacon, AN, Freeman, SJ, Janssens, RVF, Carpenter, MP, Hoffman, CR, Kay, BP, Lauritsen, T, Lister, CJ, O'Donnell, D, Oilier, J, Seweryniak, D, Smith, JF, Spohr, K-M, Tabor, SL, Tripathi, V, Wady, PT & Zhu, S 2010, 'Cross-shell excitations in Al-30 and Si-30 at high spin', Nuclear Physics A, vol. 847, no. 3-4, pp. 149-167. https://doi.org/10.1016/j.nuclphysa.2010.07.010

TY - JOUR

T1 - Cross-shell excitations in Al-30 and Si-30 at high spin

AU - Steppenbeck, D.

AU - Deacon, A. N.

AU - Freeman, S. J.

AU - Janssens, R. V. F.

AU - Carpenter, M. P.

AU - Hoffman, C. R.

AU - Kay, B. P.

AU - Lauritsen, T.

AU - Lister, C. J.

AU - O'Donnell, D.

AU - Oilier, J.

AU - Seweryniak, D.

AU - Smith, J. F.

AU - Spohr, K. -M.

AU - Tabor, S. L.

AU - Tripathi, V.

AU - Wady, P. T.

AU - Zhu, S.

PY - 2010/12/8

Y1 - 2010/12/8

N2 - Yrast and near-yrast states in Al-30 and Si-30 have been populated to high spin with the O-18+ C-14 fusion-evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J similar to 9h at 9.4 and 15.5 MeV, respectively. Their decay schemes indicate that cross-shell excitations dominate at high spin, where negative-parity structures exist. Positive-parity states are compared to the results of shell-model calculations using the USD, USDA, and USDB effective interactions. The negative-parity levels are compared to predictions of the W BP interaction and the recently-developed WBP-a Hamiltonian, by allowing 1p-1h excitations to fp-shell orbitals. The results suggest that single-neutron excitations to the 0f(7/2) orbital play a significant role at high spin. (C) 2010 Elsevier B.V. All rights reserved.

AB - Yrast and near-yrast states in Al-30 and Si-30 have been populated to high spin with the O-18+ C-14 fusion-evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J similar to 9h at 9.4 and 15.5 MeV, respectively. Their decay schemes indicate that cross-shell excitations dominate at high spin, where negative-parity structures exist. Positive-parity states are compared to the results of shell-model calculations using the USD, USDA, and USDB effective interactions. The negative-parity levels are compared to predictions of the W BP interaction and the recently-developed WBP-a Hamiltonian, by allowing 1p-1h excitations to fp-shell orbitals. The results suggest that single-neutron excitations to the 0f(7/2) orbital play a significant role at high spin. (C) 2010 Elsevier B.V. All rights reserved.

KW - NUCLEAR REACTIONS C-14(O-18, X), E=37 MeV

KW - measured E-gamma, I-gamma, (residue)gamma-, gamma gamma-coin, gamma(theta), DCO ratios using the Gammasphere array and Fragment Mass Analyzer, Al-30, Si-30

KW - deduced levels, J, pi, multipolarities, Comparison with shell-model calculations

UR - http://www.scopus.com/inward/record.url?scp=77957687469&partnerID=8YFLogxK

U2 - 10.1016/j.nuclphysa.2010.07.010

DO - 10.1016/j.nuclphysa.2010.07.010

M3 - Article

SN - 0375-9474

VL - 847

SP - 149

EP - 167

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 3-4

ER -

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

Abstract

Keywords

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