Evidence for octupole collectivity in 172Pt

A. Ertoprak; B. Cederwall; C. Qi; Aktas; M. Doncel; B. Hadinia; R. Liotta; M. Sandzelius; C. Scholey; K. Andgren; T. Bäck; H. Badran; T. Braunroth; T. Calverley; D. M. Cox; D. M. Cullen; Y. D. Fang; E. Ganioğlu; M. Giles; M. B. Gomez Hornillos; T. Grahn; P. T. Greenlees; J. Hilton; D. Hodge; E. Ideguchi; U. Jakobsson; A. Johnson; P. M. Jones; R. Julin; S. Juutinen; S. Ketelhut; A. Khaplanov; M. Kumar Raju; M. Leino; H. Li; H. Liu; S. Matta; V. Modamio; B. S. Nara Singh; M. Niikura; M. Nyman; I. Özgür; R. D. Page; J. Pakarinen; P. Papadakis; J. Partanen; E. S. Paul; C. M. Petrache; P. Peura; P. Rahkila; P. Ruotsalainen; J. Sarén; J. Sorri; S. Stolze; P. Subramaniam; M. J. Taylor; J. Uusitalo; J. J. Valiente-Dobón; R. Wyss

doi:10.1140/epja/s10050-020-00071-6

Evidence for octupole collectivity in ¹⁷²Pt

A. Ertoprak, B. Cederwall, C. Qi, Aktas, M. Doncel, B. Hadinia, R. Liotta, M. Sandzelius, C. Scholey, K. Andgren, T. Bäck, H. Badran, T. Braunroth, T. Calverley, D. M. Cox, D. M. Cullen, Y. D. Fang, E. Ganioğlu, M. Giles, M. B. Gomez HornillosT. Grahn, P. T. Greenlees, J. Hilton, D. Hodge, E. Ideguchi, U. Jakobsson, A. Johnson, P. M. Jones, R. Julin, S. Juutinen, S. Ketelhut, A. Khaplanov, M. Kumar Raju, M. Leino, H. Li, H. Liu, S. Matta, V. Modamio, B. S. Nara Singh, M. Niikura, M. Nyman, I. Özgür, R. D. Page, J. Pakarinen, P. Papadakis, J. Partanen, E. S. Paul, C. M. Petrache, P. Peura, P. Rahkila, P. Ruotsalainen, J. Sarén, J. Sorri, S. Stolze, P. Subramaniam, M. J. Taylor, J. Uusitalo, J. J. Valiente-Dobón, R. Wyss

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Abstract

Excited states in the extremely neutron-deficient nucleus ¹⁷²Pt were populated via ⁹⁶Ru (⁷⁸Kr , 2 p) and ⁹²Mo (⁸³Kr , 3 n) reactions. The level scheme has been extended up to an excitation energy of ≈5MeV and tentative spin-parity assignments up to I^π= 18 ⁺. Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negative-parity band. The lowest member of this negative-parity structure was firmly assigned spin-parity 3 ^-. In addition, we observed an E3 transition from this 3 ^- state to the ground state, providing direct evidence for octupole collectivity in ¹⁷²Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3 ^- state as a collective octupole-vibrational state.

Original language	English
Article number	65
Journal	European Physical Journal A
Volume	56
Issue number	2
DOIs	https://doi.org/10.1140/epja/s10050-020-00071-6
State	Published - Feb 1 2020

Funding

Open access funding provided by Royal Institute of Technology. The authors thank the staff at the Accelerator Laboratory at the University of Jyv\u00E4skyl\u00E4 for excellent technical support. This work was supported through EURONS (European Commission Contract no. RII3-CT-2004-506065) and by the Academy of Finland under the Finnish Centre of Excellence Programme. Further support for this work has been provided by the Swedish Research Council under Grant no. 621-2014-5558 and the United Kingdom Science and Technology Facilities Council. DMC, MG acknowledge support of the STFC under contract numbers EP/E02551X/1 and ST/L005794/1. E. I., Y. D. F., and M. K. R. acknowledge support from the International Joint Research Promotion Program of Osaka University and JSPS KAKENHI Grant number JP 17H02893. The authors acknowledge the support from the GAMMAPOOL detector collaboration for the loan of JUROGAM detectors.

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Ertoprak, A., Cederwall, B., Qi, C., Aktas, Doncel, M., Hadinia, B., Liotta, R., Sandzelius, M., Scholey, C., Andgren, K., Bäck, T., Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Cullen, D. M., Fang, Y. D., Ganioğlu, E., Giles, M., ... Wyss, R. (2020). Evidence for octupole collectivity in ¹⁷²Pt. European Physical Journal A, 56(2), Article 65. https://doi.org/10.1140/epja/s10050-020-00071-6

@article{4740b5be52964312a0fecdec21794230,

title = "Evidence for octupole collectivity in 172Pt",

abstract = "Excited states in the extremely neutron-deficient nucleus 172Pt were populated via 96Ru (78Kr , 2 p) and 92Mo (83Kr , 3 n) reactions. The level scheme has been extended up to an excitation energy of ≈5MeV and tentative spin-parity assignments up to Iπ= 18 +. Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negative-parity band. The lowest member of this negative-parity structure was firmly assigned spin-parity 3 -. In addition, we observed an E3 transition from this 3 - state to the ground state, providing direct evidence for octupole collectivity in 172Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3 - state as a collective octupole-vibrational state.",

author = "A. Ertoprak and B. Cederwall and C. Qi and Aktas and M. Doncel and B. Hadinia and R. Liotta and M. Sandzelius and C. Scholey and K. Andgren and T. B{\"a}ck and H. Badran and T. Braunroth and T. Calverley and Cox, {D. M.} and Cullen, {D. M.} and Fang, {Y. D.} and E. Ganioğlu and M. Giles and Gomez Hornillos, {M. B.} and T. Grahn and Greenlees, {P. T.} and J. Hilton and D. Hodge and E. Ideguchi and U. Jakobsson and A. Johnson and Jones, {P. M.} and R. Julin and S. Juutinen and S. Ketelhut and A. Khaplanov and M. Kumar Raju and M. Leino and H. Li and H. Liu and S. Matta and V. Modamio and Nara Singh, {B. S.} and M. Niikura and M. Nyman and I. {\"O}zg{\"u}r and Page, {R. D.} and J. Pakarinen and P. Papadakis and J. Partanen and Paul, {E. S.} and Petrache, {C. M.} and P. Peura and P. Rahkila and P. Ruotsalainen and J. Sar{\'e}n and J. Sorri and S. Stolze and P. Subramaniam and Taylor, {M. J.} and J. Uusitalo and Valiente-Dob{\'o}n, {J. J.} and R. Wyss",

note = "Publisher Copyright: {\textcopyright} 2020, The Author(s).",

year = "2020",

month = feb,

day = "1",

doi = "10.1140/epja/s10050-020-00071-6",

language = "English",

volume = "56",

journal = "European Physical Journal A",

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Ertoprak, A, Cederwall, B, Qi, C, Aktas, Doncel, M, Hadinia, B, Liotta, R, Sandzelius, M, Scholey, C, Andgren, K, Bäck, T, Badran, H, Braunroth, T, Calverley, T, Cox, DM, Cullen, DM, Fang, YD, Ganioğlu, E, Giles, M, Gomez Hornillos, MB, Grahn, T, Greenlees, PT, Hilton, J, Hodge, D, Ideguchi, E, Jakobsson, U, Johnson, A, Jones, PM, Julin, R, Juutinen, S, Ketelhut, S, Khaplanov, A, Kumar Raju, M, Leino, M, Li, H, Liu, H, Matta, S, Modamio, V, Nara Singh, BS, Niikura, M, Nyman, M, Özgür, I, Page, RD, Pakarinen, J, Papadakis, P, Partanen, J, Paul, ES, Petrache, CM, Peura, P, Rahkila, P, Ruotsalainen, P, Sarén, J, Sorri, J, Stolze, S, Subramaniam, P, Taylor, MJ, Uusitalo, J, Valiente-Dobón, JJ & Wyss, R 2020, 'Evidence for octupole collectivity in ¹⁷²Pt', European Physical Journal A, vol. 56, no. 2, 65. https://doi.org/10.1140/epja/s10050-020-00071-6

TY - JOUR

T1 - Evidence for octupole collectivity in 172Pt

AU - Ertoprak, A.

AU - Cederwall, B.

AU - Qi, C.

AU - Aktas,

AU - Doncel, M.

AU - Hadinia, B.

AU - Liotta, R.

AU - Sandzelius, M.

AU - Scholey, C.

AU - Andgren, K.

AU - Bäck, T.

AU - Badran, H.

AU - Braunroth, T.

AU - Calverley, T.

AU - Cox, D. M.

AU - Cullen, D. M.

AU - Fang, Y. D.

AU - Ganioğlu, E.

AU - Giles, M.

AU - Gomez Hornillos, M. B.

AU - Grahn, T.

AU - Greenlees, P. T.

AU - Hilton, J.

AU - Hodge, D.

AU - Ideguchi, E.

AU - Jakobsson, U.

AU - Johnson, A.

AU - Jones, P. M.

AU - Julin, R.

AU - Juutinen, S.

AU - Ketelhut, S.

AU - Khaplanov, A.

AU - Kumar Raju, M.

AU - Leino, M.

AU - Li, H.

AU - Liu, H.

AU - Matta, S.

AU - Modamio, V.

AU - Nara Singh, B. S.

AU - Niikura, M.

AU - Nyman, M.

AU - Özgür, I.

AU - Page, R. D.

AU - Pakarinen, J.

AU - Papadakis, P.

AU - Partanen, J.

AU - Paul, E. S.

AU - Petrache, C. M.

AU - Peura, P.

AU - Rahkila, P.

AU - Ruotsalainen, P.

AU - Sarén, J.

AU - Sorri, J.

AU - Stolze, S.

AU - Subramaniam, P.

AU - Taylor, M. J.

AU - Uusitalo, J.

AU - Valiente-Dobón, J. J.

AU - Wyss, R.

PY - 2020/2/1

Y1 - 2020/2/1

N2 - Excited states in the extremely neutron-deficient nucleus 172Pt were populated via 96Ru (78Kr , 2 p) and 92Mo (83Kr , 3 n) reactions. The level scheme has been extended up to an excitation energy of ≈5MeV and tentative spin-parity assignments up to Iπ= 18 +. Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negative-parity band. The lowest member of this negative-parity structure was firmly assigned spin-parity 3 -. In addition, we observed an E3 transition from this 3 - state to the ground state, providing direct evidence for octupole collectivity in 172Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3 - state as a collective octupole-vibrational state.

AB - Excited states in the extremely neutron-deficient nucleus 172Pt were populated via 96Ru (78Kr , 2 p) and 92Mo (83Kr , 3 n) reactions. The level scheme has been extended up to an excitation energy of ≈5MeV and tentative spin-parity assignments up to Iπ= 18 +. Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negative-parity band. The lowest member of this negative-parity structure was firmly assigned spin-parity 3 -. In addition, we observed an E3 transition from this 3 - state to the ground state, providing direct evidence for octupole collectivity in 172Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3 - state as a collective octupole-vibrational state.

UR - http://www.scopus.com/inward/record.url?scp=85079637616&partnerID=8YFLogxK

U2 - 10.1140/epja/s10050-020-00071-6

DO - 10.1140/epja/s10050-020-00071-6

M3 - Article

AN - SCOPUS:85079637616

SN - 1434-6001

VL - 56

JO - European Physical Journal A

JF - European Physical Journal A

IS - 2

M1 - 65

ER -

Evidence for octupole collectivity in ¹⁷²Pt

Abstract

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