Cross-shell excitations in $^30Al$ and $^30Si$ 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. Ollier; 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 $^30Al$ and $^30Si$ 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. Ollier
, D. Seweryniak
, J.F. Smith
, K.M. Spohr
, S.L. Tabor
, V. Tripathi
, P.T. Wady
, S. Zhu

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

9 Citations (Scopus)

Abstract

Yrast and near-yrast states in 30Al and 30Si have been populated to high spin with the O18+C14 fusion–evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J∼9ℏ 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 WBP 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 0f7/2 orbital play a significant role at high spin.

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 - 14 Aug 2010

Keywords

Nuclear reactions, 14C(18O, X)
E=37MeV
measured, Eγ
Iγ
(residue)γ-
γγ-coin
γ(θ)
DCO ratios using the Gammasphere array and Fragment Mass Analyzer
30Al
30Si
deduced, levels
J
π
multipolarities
Comparison with shell-model calculations

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10.1016/j.nuclphysa.2010.07.010

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

@article{32bd8cd05a1f47579f6701abf65be328,

title = "Cross-shell excitations in \$\textasciicircum{}30Al\$ and \$\textasciicircum{}30Si\$ at high spin",

abstract = "Yrast and near-yrast states in 30Al and 30Si have been populated to high spin with the O18+C14 fusion–evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J∼9ℏ 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 WBP 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 0f7/2 orbital play a significant role at high spin.",

keywords = "Nuclear reactions, 14C(18O, X), E=37MeV, measured, Eγ, Iγ, (residue)γ-, γγ-coin, γ(θ), DCO ratios using the Gammasphere array and Fragment Mass Analyzer, 30Al, 30Si, deduced, levels, J, π, multipolarities, Comparison with shell-model calculations",

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

year = "2010",

month = aug,

day = "14",

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

language = "English",

volume = "847",

pages = "149--167",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier B.V.",

number = "3-4",

}

Steppenbeck, D, Deacon, AN, Freeman, SJ, Janssens, RVF, Carpenter, MP, Hoffman, CR, Kay, BP, Lauritsen, T, Lister, CJ, O'Donnell, D, Ollier, J, Seweryniak, D, Smith, JF, Spohr, KM, Tabor, SL, Tripathi, V, Wady, PT & Zhu, S 2010, 'Cross-shell excitations in $^30Al$ and $^30Si$ 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 $^30Al$ and $^30Si$ 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 - Ollier, 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 - 2010/8/14

Y1 - 2010/8/14

N2 - Yrast and near-yrast states in 30Al and 30Si have been populated to high spin with the O18+C14 fusion–evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J∼9ℏ 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 WBP 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 0f7/2 orbital play a significant role at high spin.

AB - Yrast and near-yrast states in 30Al and 30Si have been populated to high spin with the O18+C14 fusion–evaporation reaction in inverse kinematics. The level schemes for these two isobars have been extended up to J∼9ℏ 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 WBP 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 0f7/2 orbital play a significant role at high spin.

KW - Nuclear reactions, 14C(18O, X)

KW - E=37MeV

KW - measured, Eγ

KW - Iγ

KW - (residue)γ-

KW - γγ-coin

KW - γ(θ)

KW - DCO ratios using the Gammasphere array and Fragment Mass Analyzer

KW - 30Al

KW - 30Si

KW - deduced, levels

KW - J

KW - π

KW - multipolarities

KW - Comparison with shell-model calculations

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 $^30Al$ and $^30Si$ at high spin

Abstract

Keywords

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