Structure of the neutron-rich Cr isotopes: Inadequacy of the fp model space and onset of deformation

S. J. Freeman; R. V F Janssens; B. A. Brown; I. V. Calderin; M. P. Carpenter; P. Chowdhury; A. N. Deacon; S. M. Fischer; N. J. Hammond; M. Honma; T. Lauritsen; C. J. Lister; T. L. Khoo; G. Mukherjee; D. Seweryniak; J. F. Smith; S. L. Tabor; B. J. Varley; M. Whitehead; S. Zhu

doi:10.1063/1.1905303

Structure of the neutron-rich Cr isotopes: Inadequacy of the fp model space and onset of deformation

S. J. Freeman, R. V F Janssens, B. A. Brown, I. V. Calderin, M. P. Carpenter, P. Chowdhury, A. N. Deacon, S. M. Fischer, N. J. Hammond, M. Honma, T. Lauritsen, C. J. Lister, T. L. Khoo, G. Mukherjee, D. Seweryniak, J. F. Smith, S. L. Tabor, B. J. Varley, M. Whitehead, S. Zhu

Research output: Chapter in Book/Conference proceeding › Conference contribution

Abstract

The low-lying levels in 59,60Cr have been populated with 13,14C(48Ca, 2p) reactions using a beam energy of 130 MeV. Prompt electromagnetic radiation was detected using the Gammasphere array, in coincidence with the detection of recoiling ions performed with the Fragment Mass Analyzer and a gas-filled ion chamber. The residues of interest were selected and identified on the basis of charge-to-mass ratio, energy-loss and time-of-flight measurements. These methods have isolated γ rays from the 2p evaporation channel for the first time. The low-lying structure of 59Cr is clearly inconsistent with the results of shell-model calculations within the full fp shell model and requires the inclusion of the g9/2 orbital. The sequence of states can be understood within the Nilsson model assuming a moderate oblate ground-state deformation. Preliminary results for 60Cr are discussed in terms of the development of deformation in the region. None of the low-lying structures observed so far exhibit a clear indication for a well-developed oblate shape. © 2005 American Institute of Physics.

Original language	English
Title of host publication	AIP Conference Proceedings\|AIP Conf. Proc.
Place of Publication	AIP Conference Proceedings
Publisher	American Institute of Physics
Pages	142-147
Number of pages	5
Volume	764
ISBN (Print)	0735402493, 9780735402492
DOIs	https://doi.org/10.1063/1.1905303
Publication status	Published - 5 Apr 2005
Event	Nuclei at the Limits - Argonne, IL Duration: 5 Apr 2005 → … http://<Go to ISI>://000228894800021

Conference

Conference	Nuclei at the Limits
City	Argonne, IL
Period	5/04/05 → …
Internet address	http://<Go to ISI>://000228894800021

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10.1063/1.1905303

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Freeman, S. J., Janssens, R. V. F., Brown, B. A., Calderin, I. V., Carpenter, M. P., Chowdhury, P., Deacon, A. N., Fischer, S. M., Hammond, N. J., Honma, M., Lauritsen, T., Lister, C. J., Khoo, T. L., Mukherjee, G., Seweryniak, D., Smith, J. F., Tabor, S. L., Varley, B. J., Whitehead, M., & Zhu, S. (2005). Structure of the neutron-rich Cr isotopes: Inadequacy of the fp model space and onset of deformation. In AIP Conference Proceedings|AIP Conf. Proc. (Vol. 764, pp. 142-147). American Institute of Physics. https://doi.org/10.1063/1.1905303

@inproceedings{78f82780b4b149ce83d9c801ef6f6672,

title = "Structure of the neutron-rich Cr isotopes: Inadequacy of the fp model space and onset of deformation",

abstract = "The low-lying levels in 59,60Cr have been populated with 13,14C(48Ca, 2p) reactions using a beam energy of 130 MeV. Prompt electromagnetic radiation was detected using the Gammasphere array, in coincidence with the detection of recoiling ions performed with the Fragment Mass Analyzer and a gas-filled ion chamber. The residues of interest were selected and identified on the basis of charge-to-mass ratio, energy-loss and time-of-flight measurements. These methods have isolated γ rays from the 2p evaporation channel for the first time. The low-lying structure of 59Cr is clearly inconsistent with the results of shell-model calculations within the full fp shell model and requires the inclusion of the g9/2 orbital. The sequence of states can be understood within the Nilsson model assuming a moderate oblate ground-state deformation. Preliminary results for 60Cr are discussed in terms of the development of deformation in the region. None of the low-lying structures observed so far exhibit a clear indication for a well-developed oblate shape. {\textcopyright} 2005 American Institute of Physics.",

author = "Freeman, {S. J.} and Janssens, {R. V F} and Brown, {B. A.} and Calderin, {I. V.} and Carpenter, {M. P.} and P. Chowdhury and Deacon, {A. N.} and Fischer, {S. M.} and Hammond, {N. J.} and M. Honma and T. Lauritsen and Lister, {C. J.} and Khoo, {T. L.} and G. Mukherjee and D. Seweryniak and Smith, {J. F.} and Tabor, {S. L.} and Varley, {B. J.} and M. Whitehead and S. Zhu",

year = "2005",

month = apr,

day = "5",

doi = "10.1063/1.1905303",

language = "English",

isbn = "0735402493",

volume = "764",

pages = "142--147",

booktitle = "AIP Conference Proceedings|AIP Conf. Proc.",

publisher = "American Institute of Physics",

address = "United States",

note = "Nuclei at the Limits ; Conference date: 05-04-2005",

url = "http://<Go to ISI>://000228894800021",

}

Freeman, SJ, Janssens, RVF, Brown, BA, Calderin, IV, Carpenter, MP, Chowdhury, P, Deacon, AN, Fischer, SM, Hammond, NJ, Honma, M, Lauritsen, T, Lister, CJ, Khoo, TL, Mukherjee, G, Seweryniak, D, Smith, JF, Tabor, SL, Varley, BJ, Whitehead, M & Zhu, S 2005, Structure of the neutron-rich Cr isotopes: Inadequacy of the fp model space and onset of deformation. in AIP Conference Proceedings|AIP Conf. Proc.. vol. 764, American Institute of Physics, AIP Conference Proceedings, pp. 142-147, Nuclei at the Limits, Argonne, IL, 5/04/05. https://doi.org/10.1063/1.1905303

TY - GEN

T1 - Structure of the neutron-rich Cr isotopes: Inadequacy of the fp model space and onset of deformation

AU - Freeman, S. J.

AU - Janssens, R. V F

AU - Brown, B. A.

AU - Calderin, I. V.

AU - Carpenter, M. P.

AU - Chowdhury, P.

AU - Deacon, A. N.

AU - Fischer, S. M.

AU - Hammond, N. J.

AU - Honma, M.

AU - Lauritsen, T.

AU - Lister, C. J.

AU - Khoo, T. L.

AU - Mukherjee, G.

AU - Seweryniak, D.

AU - Smith, J. F.

AU - Tabor, S. L.

AU - Varley, B. J.

AU - Whitehead, M.

AU - Zhu, S.

PY - 2005/4/5

Y1 - 2005/4/5

N2 - The low-lying levels in 59,60Cr have been populated with 13,14C(48Ca, 2p) reactions using a beam energy of 130 MeV. Prompt electromagnetic radiation was detected using the Gammasphere array, in coincidence with the detection of recoiling ions performed with the Fragment Mass Analyzer and a gas-filled ion chamber. The residues of interest were selected and identified on the basis of charge-to-mass ratio, energy-loss and time-of-flight measurements. These methods have isolated γ rays from the 2p evaporation channel for the first time. The low-lying structure of 59Cr is clearly inconsistent with the results of shell-model calculations within the full fp shell model and requires the inclusion of the g9/2 orbital. The sequence of states can be understood within the Nilsson model assuming a moderate oblate ground-state deformation. Preliminary results for 60Cr are discussed in terms of the development of deformation in the region. None of the low-lying structures observed so far exhibit a clear indication for a well-developed oblate shape. © 2005 American Institute of Physics.

AB - The low-lying levels in 59,60Cr have been populated with 13,14C(48Ca, 2p) reactions using a beam energy of 130 MeV. Prompt electromagnetic radiation was detected using the Gammasphere array, in coincidence with the detection of recoiling ions performed with the Fragment Mass Analyzer and a gas-filled ion chamber. The residues of interest were selected and identified on the basis of charge-to-mass ratio, energy-loss and time-of-flight measurements. These methods have isolated γ rays from the 2p evaporation channel for the first time. The low-lying structure of 59Cr is clearly inconsistent with the results of shell-model calculations within the full fp shell model and requires the inclusion of the g9/2 orbital. The sequence of states can be understood within the Nilsson model assuming a moderate oblate ground-state deformation. Preliminary results for 60Cr are discussed in terms of the development of deformation in the region. None of the low-lying structures observed so far exhibit a clear indication for a well-developed oblate shape. © 2005 American Institute of Physics.

U2 - 10.1063/1.1905303

DO - 10.1063/1.1905303

M3 - Conference contribution

SN - 0735402493

SN - 9780735402492

VL - 764

SP - 142

EP - 147

BT - AIP Conference Proceedings|AIP Conf. Proc.

PB - American Institute of Physics

CY - AIP Conference Proceedings

T2 - Nuclei at the Limits

Y2 - 5 April 2005

ER -

Structure of the neutron-rich Cr isotopes: Inadequacy of the fp model space and onset of deformation

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