Lifetimes and shape-coexisting states of 99Zr

P. Spagnoletti; G. Simpson; S. Kisyov; D. Bucurescu; J-M Regis; N. Saed-Samii; A. Blanc; M. Jentschel; U. Koster; P. Mutti; T. Soldner; G. de France; C. A. Ur; W. Urban; A. M. Bruce; C. Bernards; F. Drouet; L. M. Fraile; L. P. Gaffney; D. G. Ghita; S. Ilieva; J. Jolie; W. Korten; T. Kroll; S. Lalkovski; C. Larijarni; R. Lica; H. Mach; N. Marginean; V Paziy; Zs Podolyak; P. H. Regan; M. Scheck; J. F. Smith; G. Thiamova; C. Townsley; A. Vancraeyenest; V. Vedia; N. Warr; V Werner; M. Zielinska

doi:10.1103/PhysRevC.100.014311

Lifetimes and shape-coexisting states of ⁹⁹Zr

P. Spagnoletti, G. Simpson, S. Kisyov, D. Bucurescu, J-M Regis, N. Saed-Samii, A. Blanc, M. Jentschel, U. Koster, P. Mutti, T. Soldner, G. de France, C. A. Ur, W. Urban, A. M. Bruce, C. Bernards, F. Drouet, L. M. Fraile, L. P. Gaffney, D. G. GhitaS. Ilieva, J. Jolie, W. Korten, T. Kroll, S. Lalkovski, C. Larijarni, R. Lica, H. Mach, N. Marginean, V Paziy, Zs Podolyak, P. H. Regan, M. Scheck, J. F. Smith, G. Thiamova, C. Townsley, A. Vancraeyenest, V. Vedia, N. Warr, V Werner, M. Zielinska

School of Computing, Engineering and Physical Sciences

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Abstract

Lifetimes of intermediate-spin states in two rotational bands of ⁹⁹Zr have been measured. These states were populated following the neutron-induced ﬁssion of ²³⁵U at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus ⁹⁹Zr₅₉ exhibits shape coexistence and lies precisely on the border of an abrupt change in ground-state deformation when going from N = 58 to N = 60, making its study interesting for understanding the mechanisms involved in the rapid onset of deformation here. The B(E2) values extracted for decays in the ν3/2[541] band allow quadrupole deformations of β₂ =0.34(1) and 0.26(3) to be determined for the 821.6- and 1236.6-keV members, whereas β₂ =0.32(3) was found for the 850.5-keV member of the ν3/2[411] band. Some of the excited states known in ⁹⁹Zr have been reasonably described with interacting boson-fermion model (IBFM) calculations. Type-II shell evolution is proposed to play a major role in modifying single-particle energies in ⁹⁹Zr.

Original language	English
Article number	014311
Number of pages	11
Journal	Physical Review C
Volume	100
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.100.014311
Publication status	Published - 16 Jul 2019

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2019 07 16 Spagnoletti et al Lifetimes Final Final published version, 1.21 MBLicence: CC BY

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Spagnoletti, P., Simpson, G., Kisyov, S., Bucurescu, D., Regis, J.-M., Saed-Samii, N., Blanc, A., Jentschel, M., Koster, U., Mutti, P., Soldner, T., de France, G., Ur, C. A., Urban, W., Bruce, A. M., Bernards, C., Drouet, F., Fraile, L. M., Gaffney, L. P., ... Zielinska, M. (2019). Lifetimes and shape-coexisting states of ⁹⁹Zr. Physical Review C, 100(1), Article 014311 . https://doi.org/10.1103/PhysRevC.100.014311

@article{8432218e751e46d19792dcb751034c46,

title = "Lifetimes and shape-coexisting states of 99Zr",

abstract = "Lifetimes of intermediate-spin states in two rotational bands of 99Zr have been measured. These states were populated following the neutron-induced ﬁssion of 235U at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus 99Zr59 exhibits shape coexistence and lies precisely on the border of an abrupt change in ground-state deformation when going from N = 58 to N = 60, making its study interesting for understanding the mechanisms involved in the rapid onset of deformation here. The B(E2) values extracted for decays in the ν3/2[541] band allow quadrupole deformations of β2 =0.34(1) and 0.26(3) to be determined for the 821.6- and 1236.6-keV members, whereas β2 =0.32(3) was found for the 850.5-keV member of the ν3/2[411] band. Some of the excited states known in 99Zr have been reasonably described with interacting boson-fermion model (IBFM) calculations. Type-II shell evolution is proposed to play a major role in modifying single-particle energies in 99Zr.",

author = "P. Spagnoletti and G. Simpson and S. Kisyov and D. Bucurescu and J-M Regis and N. Saed-Samii and A. Blanc and M. Jentschel and U. Koster and P. Mutti and T. Soldner and {de France}, G. and Ur, {C. A.} and W. Urban and Bruce, {A. M.} and C. Bernards and F. Drouet and Fraile, {L. M.} and Gaffney, {L. P.} and Ghita, {D. G.} and S. Ilieva and J. Jolie and W. Korten and T. Kroll and S. Lalkovski and C. Larijarni and R. Lica and H. Mach and N. Marginean and V Paziy and Zs Podolyak and Regan, {P. H.} and M. Scheck and Smith, {J. F.} and G. Thiamova and C. Townsley and A. Vancraeyenest and V. Vedia and N. Warr and V Werner and M. Zielinska",

year = "2019",

month = jul,

day = "16",

doi = "10.1103/PhysRevC.100.014311",

language = "English",

volume = "100",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "1",

}

Spagnoletti, P, Simpson, G, Kisyov, S, Bucurescu, D, Regis, J-M, Saed-Samii, N, Blanc, A, Jentschel, M, Koster, U, Mutti, P, Soldner, T, de France, G, Ur, CA, Urban, W, Bruce, AM, Bernards, C, Drouet, F, Fraile, LM, Gaffney, LP, Ghita, DG, Ilieva, S, Jolie, J, Korten, W, Kroll, T, Lalkovski, S, Larijarni, C, Lica, R, Mach, H, Marginean, N, Paziy, V, Podolyak, Z, Regan, PH, Scheck, M , Smith, JF, Thiamova, G, Townsley, C, Vancraeyenest, A, Vedia, V, Warr, N, Werner, V & Zielinska, M 2019, 'Lifetimes and shape-coexisting states of ⁹⁹Zr', Physical Review C, vol. 100, no. 1, 014311 . https://doi.org/10.1103/PhysRevC.100.014311

TY - JOUR

T1 - Lifetimes and shape-coexisting states of 99Zr

AU - Spagnoletti, P.

AU - Simpson, G.

AU - Kisyov, S.

AU - Bucurescu, D.

AU - Regis, J-M

AU - Saed-Samii, N.

AU - Blanc, A.

AU - Jentschel, M.

AU - Koster, U.

AU - Mutti, P.

AU - Soldner, T.

AU - de France, G.

AU - Ur, C. A.

AU - Urban, W.

AU - Bruce, A. M.

AU - Bernards, C.

AU - Drouet, F.

AU - Fraile, L. M.

AU - Gaffney, L. P.

AU - Ghita, D. G.

AU - Ilieva, S.

AU - Jolie, J.

AU - Korten, W.

AU - Kroll, T.

AU - Lalkovski, S.

AU - Larijarni, C.

AU - Lica, R.

AU - Mach, H.

AU - Marginean, N.

AU - Paziy, V

AU - Podolyak, Zs

AU - Regan, P. H.

AU - Scheck, M.

AU - Smith, J. F.

AU - Thiamova, G.

AU - Townsley, C.

AU - Vancraeyenest, A.

AU - Vedia, V.

AU - Warr, N.

AU - Werner, V

AU - Zielinska, M.

PY - 2019/7/16

Y1 - 2019/7/16

N2 - Lifetimes of intermediate-spin states in two rotational bands of 99Zr have been measured. These states were populated following the neutron-induced ﬁssion of 235U at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus 99Zr59 exhibits shape coexistence and lies precisely on the border of an abrupt change in ground-state deformation when going from N = 58 to N = 60, making its study interesting for understanding the mechanisms involved in the rapid onset of deformation here. The B(E2) values extracted for decays in the ν3/2[541] band allow quadrupole deformations of β2 =0.34(1) and 0.26(3) to be determined for the 821.6- and 1236.6-keV members, whereas β2 =0.32(3) was found for the 850.5-keV member of the ν3/2[411] band. Some of the excited states known in 99Zr have been reasonably described with interacting boson-fermion model (IBFM) calculations. Type-II shell evolution is proposed to play a major role in modifying single-particle energies in 99Zr.

AB - Lifetimes of intermediate-spin states in two rotational bands of 99Zr have been measured. These states were populated following the neutron-induced ﬁssion of 235U at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus 99Zr59 exhibits shape coexistence and lies precisely on the border of an abrupt change in ground-state deformation when going from N = 58 to N = 60, making its study interesting for understanding the mechanisms involved in the rapid onset of deformation here. The B(E2) values extracted for decays in the ν3/2[541] band allow quadrupole deformations of β2 =0.34(1) and 0.26(3) to be determined for the 821.6- and 1236.6-keV members, whereas β2 =0.32(3) was found for the 850.5-keV member of the ν3/2[411] band. Some of the excited states known in 99Zr have been reasonably described with interacting boson-fermion model (IBFM) calculations. Type-II shell evolution is proposed to play a major role in modifying single-particle energies in 99Zr.

U2 - 10.1103/PhysRevC.100.014311

DO - 10.1103/PhysRevC.100.014311

M3 - Article

SN - 2469-9985

VL - 100

JO - Physical Review C

JF - Physical Review C

IS - 1

M1 - 014311

ER -

Lifetimes and shape-coexisting states of 99Zr

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Lifetimes and shape-coexisting states of ⁹⁹Zr