The deformed 0+ state in 34Si

S. Paschalis; P. Fallon; A. O. Macchiavelli; M. Petri; P. C. Bender; M. P. Carpenter; X. Chen; C. J. Chiara; R. M. Clark; M. Cromaz; S. Gros; L. Hamilton; C. R. Hoffman; R. V F Janssens; T. Lauritsen; I. Y. Lee; C. J. Lister; E. A. McCutchan; L. Phair; W. Reviol; D. G. Sarantites; D. Seweryniak; S. L. Tabor; Y. Toh; M. Wiedeking; S. Zhu

doi:10.1088/1742-6596/312/9/092050

The deformed 0+ state in 34Si

S. Paschalis^*, P. Fallon, A. O. Macchiavelli, M. Petri, P. C. Bender, M. P. Carpenter, X. Chen, C. J. Chiara, R. M. Clark, M. Cromaz, S. Gros, L. Hamilton, C. R. Hoffman, R. V F Janssens, T. Lauritsen, I. Y. Lee, C. J. Lister, E. A. McCutchan, L. Phair, W. ReviolD. G. Sarantites, D. Seweryniak, S. L. Tabor, Y. Toh, M. Wiedeking, S. Zhu

^*Corresponding author for this work

Physics

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

Abstract

The energy of the lowest deformed 2-particle 2-hole (2p2h) 0⁺ state in even-even N = 20 nuclei is a key observable directly related to the size of the neutron N = 20 shell closure. ³⁴Si, with 14 protons and 20 neutrons, lies at the boundary of the "island of inversion", where the deformed 2p2h 0⁺ state is the ground state in even-A nuclei. In ³⁴Si, the 2p2h 0⁺ state is expected to be particularly low lying - in some theories it is even predicted to lie below the first 2 ⁺ state. While there have been a number of attempts, using various techniques, no experiment to date has been able to firmly locate the ³⁴Si 2p2h 0⁺ state although a number of candidates have been suggested. Here we present, for the first time, data obtained from a fusion-evaporation reaction ¹⁸O(¹⁸O, 2p) to produce ³⁴Si. Gammasphere and Microball were used to detect γ-γ coincidences and charged particles (two protons), respectively. The increased sensitivity of this experiment using γ-γ coincidences and a high charged-particle detection efficiency helped to exclude previously reported candidates and provided a stringent limit on the anticipated γ decay from the first 2⁺ state to the 2p2h 0⁺ state.

Original language	English
Article number	092050
Journal	Journal of Physics: Conference Series
Volume	312
Issue number	SECTION 9
DOIs	https://doi.org/10.1088/1742-6596/312/9/092050
Publication status	Published - 2011

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Paschalis, S., Fallon, P., Macchiavelli, A. O., Petri, M., Bender, P. C., Carpenter, M. P., Chen, X., Chiara, C. J., Clark, R. M., Cromaz, M., Gros, S., Hamilton, L., Hoffman, C. R., Janssens, R. V. F., Lauritsen, T., Lee, I. Y., Lister, C. J., McCutchan, E. A., Phair, L., ... Zhu, S. (2011). The deformed 0+ state in 34Si. Journal of Physics: Conference Series, 312(SECTION 9), Article 092050. https://doi.org/10.1088/1742-6596/312/9/092050

@article{e169c07b5af249b6afa39c077b46bdab,

title = "The deformed 0+ state in 34Si",

abstract = "The energy of the lowest deformed 2-particle 2-hole (2p2h) 0+ state in even-even N = 20 nuclei is a key observable directly related to the size of the neutron N = 20 shell closure. 34Si, with 14 protons and 20 neutrons, lies at the boundary of the {"}island of inversion{"}, where the deformed 2p2h 0+ state is the ground state in even-A nuclei. In 34Si, the 2p2h 0+ state is expected to be particularly low lying - in some theories it is even predicted to lie below the first 2 + state. While there have been a number of attempts, using various techniques, no experiment to date has been able to firmly locate the 34Si 2p2h 0+ state although a number of candidates have been suggested. Here we present, for the first time, data obtained from a fusion-evaporation reaction 18O(18O, 2p) to produce 34Si. Gammasphere and Microball were used to detect γ-γ coincidences and charged particles (two protons), respectively. The increased sensitivity of this experiment using γ-γ coincidences and a high charged-particle detection efficiency helped to exclude previously reported candidates and provided a stringent limit on the anticipated γ decay from the first 2+ state to the 2p2h 0+ state.",

author = "S. Paschalis and P. Fallon and Macchiavelli, {A. O.} and M. Petri and Bender, {P. C.} and Carpenter, {M. P.} and X. Chen and Chiara, {C. J.} and Clark, {R. M.} and M. Cromaz and S. Gros and L. Hamilton and Hoffman, {C. R.} and Janssens, {R. V F} and T. Lauritsen and Lee, {I. Y.} and Lister, {C. J.} and McCutchan, {E. A.} and L. Phair and W. Reviol and Sarantites, {D. G.} and D. Seweryniak and Tabor, {S. L.} and Y. Toh and M. Wiedeking and S. Zhu",

year = "2011",

doi = "10.1088/1742-6596/312/9/092050",

language = "English",

volume = "312",

journal = "Journal of Physics: Conference Series",

issn = "1742-6588",

publisher = "IOP Publishing",

number = "SECTION 9",

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Paschalis, S, Fallon, P, Macchiavelli, AO, Petri, M, Bender, PC, Carpenter, MP, Chen, X, Chiara, CJ, Clark, RM, Cromaz, M, Gros, S, Hamilton, L, Hoffman, CR, Janssens, RVF, Lauritsen, T, Lee, IY, Lister, CJ, McCutchan, EA, Phair, L, Reviol, W, Sarantites, DG, Seweryniak, D, Tabor, SL, Toh, Y, Wiedeking, M & Zhu, S 2011, 'The deformed 0+ state in 34Si', Journal of Physics: Conference Series, vol. 312, no. SECTION 9, 092050. https://doi.org/10.1088/1742-6596/312/9/092050

TY - JOUR

T1 - The deformed 0+ state in 34Si

AU - Paschalis, S.

AU - Fallon, P.

AU - Macchiavelli, A. O.

AU - Petri, M.

AU - Bender, P. C.

AU - Carpenter, M. P.

AU - Chen, X.

AU - Chiara, C. J.

AU - Clark, R. M.

AU - Cromaz, M.

AU - Gros, S.

AU - Hamilton, L.

AU - Hoffman, C. R.

AU - Janssens, R. V F

AU - Lauritsen, T.

AU - Lee, I. Y.

AU - Lister, C. J.

AU - McCutchan, E. A.

AU - Phair, L.

AU - Reviol, W.

AU - Sarantites, D. G.

AU - Seweryniak, D.

AU - Tabor, S. L.

AU - Toh, Y.

AU - Wiedeking, M.

AU - Zhu, S.

PY - 2011

Y1 - 2011

N2 - The energy of the lowest deformed 2-particle 2-hole (2p2h) 0+ state in even-even N = 20 nuclei is a key observable directly related to the size of the neutron N = 20 shell closure. 34Si, with 14 protons and 20 neutrons, lies at the boundary of the "island of inversion", where the deformed 2p2h 0+ state is the ground state in even-A nuclei. In 34Si, the 2p2h 0+ state is expected to be particularly low lying - in some theories it is even predicted to lie below the first 2 + state. While there have been a number of attempts, using various techniques, no experiment to date has been able to firmly locate the 34Si 2p2h 0+ state although a number of candidates have been suggested. Here we present, for the first time, data obtained from a fusion-evaporation reaction 18O(18O, 2p) to produce 34Si. Gammasphere and Microball were used to detect γ-γ coincidences and charged particles (two protons), respectively. The increased sensitivity of this experiment using γ-γ coincidences and a high charged-particle detection efficiency helped to exclude previously reported candidates and provided a stringent limit on the anticipated γ decay from the first 2+ state to the 2p2h 0+ state.

AB - The energy of the lowest deformed 2-particle 2-hole (2p2h) 0+ state in even-even N = 20 nuclei is a key observable directly related to the size of the neutron N = 20 shell closure. 34Si, with 14 protons and 20 neutrons, lies at the boundary of the "island of inversion", where the deformed 2p2h 0+ state is the ground state in even-A nuclei. In 34Si, the 2p2h 0+ state is expected to be particularly low lying - in some theories it is even predicted to lie below the first 2 + state. While there have been a number of attempts, using various techniques, no experiment to date has been able to firmly locate the 34Si 2p2h 0+ state although a number of candidates have been suggested. Here we present, for the first time, data obtained from a fusion-evaporation reaction 18O(18O, 2p) to produce 34Si. Gammasphere and Microball were used to detect γ-γ coincidences and charged particles (two protons), respectively. The increased sensitivity of this experiment using γ-γ coincidences and a high charged-particle detection efficiency helped to exclude previously reported candidates and provided a stringent limit on the anticipated γ decay from the first 2+ state to the 2p2h 0+ state.

UR - http://www.scopus.com/inward/record.url?scp=80455127042&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/312/9/092050

DO - 10.1088/1742-6596/312/9/092050

M3 - Article

AN - SCOPUS:80455127042

SN - 1742-6588

VL - 312

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

IS - SECTION 9

M1 - 092050

ER -

The deformed 0+ state in 34Si

Abstract

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