Electric dipole moments in 230, 232U and implications for tetrahedral shapes

S. S. Ntshangase; R. A. Bark; D. G. Aschman; S. Bvumbi; P. Datta; P. M. Davidson; T. S. Dinoko; M. E.A. Elbasher; K. Juhász; E. M.A. Khaleel; A. Krasznahorkay; E. A. Lawrie; J. J. Lawrie; R. M. Lieder; S. N.T. Majola; P. L. Masiteng; H. Mohammed; S. M. Mullins; P. Nieminen; B. M. Nyakó; P. Papka; D. G. Roux; J. F. Sharpey-Shafer; O. Shirinda; M. A. Stankiewicz; J. Timár; A. N. Wilson

doi:10.1103/PhysRevC.82.041305

Electric dipole moments in ²³⁰, ²³²U and implications for tetrahedral shapes

S. S. Ntshangase, R. A. Bark, D. G. Aschman, S. Bvumbi, P. Datta, P. M. Davidson, T. S. Dinoko, M. E.A. Elbasher, K. Juhász, E. M.A. Khaleel, A. Krasznahorkay, E. A. Lawrie, J. J. Lawrie, R. M. Lieder, S. N.T. Majola, P. L. Masiteng, H. Mohammed, S. M. Mullins, P. Nieminen, B. M. NyakóP. Papka, D. G. Roux, J. F. Sharpey-Shafer, O. Shirinda, M. A. Stankiewicz, J. Timár, A. N. Wilson

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Abstract

The nuclei ²³⁰U and ²³²U were populated in the compound nucleus reactions ²³²Th(α,6n) and ²³²Th(α,4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. Acomprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of ²³²Uwhile one E2 transition was also observed for ²³⁰U. These allowed B(E1; I ^- → I ⁺ - 1)/B(E2; I ^- → I ^- - 2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q₂ values for the isotone ²²⁶Ra.

Original language	English
Article number	041305
Journal	Physical Review C - Nuclear Physics
Volume	82
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.82.041305
Publication status	Published - 2010

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Ntshangase, S. S., Bark, R. A., Aschman, D. G., Bvumbi, S., Datta, P., Davidson, P. M., Dinoko, T. S., Elbasher, M. E. A., Juhász, K., Khaleel, E. M. A., Krasznahorkay, A., Lawrie, E. A., Lawrie, J. J., Lieder, R. M., Majola, S. N. T., Masiteng, P. L., Mohammed, H., Mullins, S. M., Nieminen, P., ... Wilson, A. N. (2010). Electric dipole moments in ²³⁰, ²³²U and implications for tetrahedral shapes. Physical Review C - Nuclear Physics, 82(4), Article 041305. https://doi.org/10.1103/PhysRevC.82.041305

@article{c6ef88ae0c6c4a839d3926e289bdd369,

title = "Electric dipole moments in 230, 232U and implications for tetrahedral shapes",

abstract = "The nuclei 230U and 232U were populated in the compound nucleus reactions 232Th(α,6n) and 232Th(α,4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. Acomprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of 232Uwhile one E2 transition was also observed for 230U. These allowed B(E1; I - → I + - 1)/B(E2; I - → I - - 2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q2 values for the isotone 226Ra.",

author = "Ntshangase, {S. S.} and Bark, {R. A.} and Aschman, {D. G.} and S. Bvumbi and P. Datta and Davidson, {P. M.} and Dinoko, {T. S.} and Elbasher, {M. E.A.} and K. Juh{\'a}sz and Khaleel, {E. M.A.} and A. Krasznahorkay and Lawrie, {E. A.} and Lawrie, {J. J.} and Lieder, {R. M.} and Majola, {S. N.T.} and Masiteng, {P. L.} and H. Mohammed and Mullins, {S. M.} and P. Nieminen and Nyak{\'o}, {B. M.} and P. Papka and Roux, {D. G.} and Sharpey-Shafer, {J. F.} and O. Shirinda and Stankiewicz, {M. A.} and J. Tim{\'a}r and Wilson, {A. N.}",

year = "2010",

doi = "10.1103/PhysRevC.82.041305",

language = "English",

volume = "82",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "4",

}

Ntshangase, SS, Bark, RA, Aschman, DG, Bvumbi, S, Datta, P, Davidson, PM, Dinoko, TS, Elbasher, MEA, Juhász, K, Khaleel, EMA, Krasznahorkay, A, Lawrie, EA, Lawrie, JJ, Lieder, RM, Majola, SNT, Masiteng, PL, Mohammed, H, Mullins, SM, Nieminen, P, Nyakó, BM, Papka, P, Roux, DG, Sharpey-Shafer, JF, Shirinda, O, Stankiewicz, MA, Timár, J & Wilson, AN 2010, 'Electric dipole moments in ²³⁰, ²³²U and implications for tetrahedral shapes', Physical Review C - Nuclear Physics, vol. 82, no. 4, 041305. https://doi.org/10.1103/PhysRevC.82.041305

TY - JOUR

T1 - Electric dipole moments in 230, 232U and implications for tetrahedral shapes

AU - Ntshangase, S. S.

AU - Bark, R. A.

AU - Aschman, D. G.

AU - Bvumbi, S.

AU - Datta, P.

AU - Davidson, P. M.

AU - Dinoko, T. S.

AU - Elbasher, M. E.A.

AU - Juhász, K.

AU - Khaleel, E. M.A.

AU - Krasznahorkay, A.

AU - Lawrie, E. A.

AU - Lawrie, J. J.

AU - Lieder, R. M.

AU - Majola, S. N.T.

AU - Masiteng, P. L.

AU - Mohammed, H.

AU - Mullins, S. M.

AU - Nieminen, P.

AU - Nyakó, B. M.

AU - Papka, P.

AU - Roux, D. G.

AU - Sharpey-Shafer, J. F.

AU - Shirinda, O.

AU - Stankiewicz, M. A.

AU - Timár, J.

AU - Wilson, A. N.

PY - 2010

Y1 - 2010

N2 - The nuclei 230U and 232U were populated in the compound nucleus reactions 232Th(α,6n) and 232Th(α,4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. Acomprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of 232Uwhile one E2 transition was also observed for 230U. These allowed B(E1; I - → I + - 1)/B(E2; I - → I - - 2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q2 values for the isotone 226Ra.

AB - The nuclei 230U and 232U were populated in the compound nucleus reactions 232Th(α,6n) and 232Th(α,4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. Acomprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of 232Uwhile one E2 transition was also observed for 230U. These allowed B(E1; I - → I + - 1)/B(E2; I - → I - - 2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q2 values for the isotone 226Ra.

UR - http://www.scopus.com/inward/record.url?scp=78649353772&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.82.041305

DO - 10.1103/PhysRevC.82.041305

M3 - Article

SN - 0556-2813

VL - 82

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 4

M1 - 041305

ER -

Electric dipole moments in ²³⁰, ²³²U and implications for tetrahedral shapes

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