Abrupt shape transition at neutron number N = 60: B(E2) values in 94,96,98Sr from fast γ–γ timing

J. -M. Regis; J Jolie; N. Saed-Samii; N. Warr; M. Pfeiffer; A. Blanc; M. Jentschel; U. Koester; P. Mutti; T. Soldner; G.S. Simpson; F. Drouet; A. Vancraeyenest; G. de France; Emanuelle Clement; O. Stezowski; C. Ur; W. Urban; P. H. Regan; Zs. Podolyak; C. Larijarni; C. Townsley; Robert Carroll; E. Wilson; L.M. Fraile; H. Mach; V. Paziy; B. Olaizola; V. Vedia; A. Bruce; O. J. Roberts; J. F.  Smith; Marcus Scheck; T. Kroell; Anna-Lena Hartig; A. Ignatov; S. Ilieva; S. Lalkovski; W. Korten; N. Marginean; T. Otsuka; Y. Tsunoda

doi:10.1103/PhysRevC.95.054319

Abrupt shape transition at neutron number N = 60: B(E2) values in ^94,96,98Sr from fast γ–γ timing

J. -M. Regis, J Jolie, N. Saed-Samii, N. Warr, M. Pfeiffer, A. Blanc, M. Jentschel, U. Koester, P. Mutti, T. Soldner, G.S. Simpson, F. Drouet, A. Vancraeyenest, G. de France, Emanuelle Clement, O. Stezowski, C. Ur, W. Urban, P. H. Regan, Zs. PodolyakC. Larijarni, C. Townsley, Robert Carroll, E. Wilson, L.M. Fraile, H. Mach, V. Paziy, B. Olaizola, V. Vedia, A. Bruce, O. J. Roberts, J. F. Smith, Marcus Scheck, T. Kroell, Anna-Lena Hartig, A. Ignatov, S. Ilieva, S. Lalkovski, W. Korten, N. Marginean, T. Otsuka, Y. Tsunoda

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Abstract

Lifetimes of low-lying yrast states in neutron-rich ^94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr₃(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of ²³⁵U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N = 60 is identified as being caused by many-proton excitations to its g_9/2 orbit.

Original language	English
Article number	054319
Journal	Physical Review C
Volume	95
DOIs	https://doi.org/10.1103/PhysRevC.95.054319
Publication status	Published - 23 May 2017

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Regis, J. .-M., Jolie, J., Saed-Samii, N., Warr, N., Pfeiffer, M., Blanc, A., Jentschel, M., Koester, U., Mutti, P., Soldner, T., Simpson, G. S., Drouet, F., Vancraeyenest, A., de France, G., Clement, E., Stezowski, O., Ur, C., Urban, W., Regan, P. H., ... Tsunoda, Y. (2017). Abrupt shape transition at neutron number N = 60: B(E2) values in ^94,96,98Sr from fast γ–γ timing. Physical Review C, 95, Article 054319. https://doi.org/10.1103/PhysRevC.95.054319

@article{44aea7cfee9e4634b02e0932d6ac906d,

title = "Abrupt shape transition at neutron number N = 60: B(E2) values in 94,96,98Sr from fast γ–γ timing",

abstract = "Lifetimes of low-lying yrast states in neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N = 60 is identified as being caused by many-proton excitations to its g9/2 orbit.",

author = "Regis, {J. -M.} and J Jolie and N. Saed-Samii and N. Warr and M. Pfeiffer and A. Blanc and M. Jentschel and U. Koester and P. Mutti and T. Soldner and G.S. Simpson and F. Drouet and A. Vancraeyenest and {de France}, G. and Emanuelle Clement and O. Stezowski and C. Ur and W. Urban and Regan, {P. H.} and Zs. Podolyak and C. Larijarni and C. Townsley and Robert Carroll and E. Wilson and L.M. Fraile and H. Mach and V. Paziy and B. Olaizola and V. Vedia and A. Bruce and Roberts, {O. J.} and Smith, {J. F.} and Marcus Scheck and T. Kroell and Anna-Lena Hartig and A. Ignatov and S. Ilieva and S. Lalkovski and W. Korten and N. Marginean and T. Otsuka and Y. Tsunoda",

year = "2017",

month = may,

day = "23",

doi = "10.1103/PhysRevC.95.054319",

language = "English",

volume = "95",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

}

Regis, J-M, Jolie, J, Saed-Samii, N, Warr, N, Pfeiffer, M, Blanc, A, Jentschel, M, Koester, U, Mutti, P, Soldner, T, Simpson, GS, Drouet, F, Vancraeyenest, A, de France, G, Clement, E, Stezowski, O, Ur, C, Urban, W, Regan, PH, Podolyak, Z, Larijarni, C, Townsley, C, Carroll, R, Wilson, E, Fraile, LM, Mach, H, Paziy, V, Olaizola, B, Vedia, V, Bruce, A, Roberts, OJ, Smith, JF , Scheck, M, Kroell, T, Hartig, A-L, Ignatov, A, Ilieva, S, Lalkovski, S, Korten, W, Marginean, N, Otsuka, T & Tsunoda, Y 2017, 'Abrupt shape transition at neutron number N = 60: B(E2) values in ^94,96,98Sr from fast γ–γ timing', Physical Review C, vol. 95, 054319. https://doi.org/10.1103/PhysRevC.95.054319

TY - JOUR

T1 - Abrupt shape transition at neutron number N = 60: B(E2) values in 94,96,98Sr from fast γ–γ timing

AU - Regis, J. -M.

AU - Jolie, J

AU - Saed-Samii, N.

AU - Warr, N.

AU - Pfeiffer, M.

AU - Blanc, A.

AU - Jentschel, M.

AU - Koester, U.

AU - Mutti, P.

AU - Soldner, T.

AU - Simpson, G.S.

AU - Drouet, F.

AU - Vancraeyenest, A.

AU - de France, G.

AU - Clement, Emanuelle

AU - Stezowski, O.

AU - Ur, C.

AU - Urban, W.

AU - Regan, P. H.

AU - Podolyak, Zs.

AU - Larijarni, C.

AU - Townsley, C.

AU - Carroll, Robert

AU - Wilson, E.

AU - Fraile, L.M.

AU - Mach, H.

AU - Paziy, V.

AU - Olaizola, B.

AU - Vedia, V.

AU - Bruce, A.

AU - Roberts, O. J.

AU - Smith, J. F.

AU - Scheck, Marcus

AU - Kroell, T.

AU - Hartig, Anna-Lena

AU - Ignatov, A.

AU - Ilieva, S.

AU - Lalkovski, S.

AU - Korten, W.

AU - Marginean, N.

AU - Otsuka, T.

AU - Tsunoda, Y.

PY - 2017/5/23

Y1 - 2017/5/23

N2 - Lifetimes of low-lying yrast states in neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N = 60 is identified as being caused by many-proton excitations to its g9/2 orbit.

AB - Lifetimes of low-lying yrast states in neutron-rich 94,96,98Sr have been measured by Germanium-gated γ−γ fast timing with LaBr3(Ce) detectors using the EXILL&FATIMA spectrometer at the Institut Laue-Langevin. Sr fission products were generated using cold-neutron-induced fission of 235U and stopped almost instantaneously within the thick target. The experimental B(E2) values are compared with results of Monte Carlo shell-model calculations made without truncation on the occupation numbers of the orbits spanned by eight proton and eight neutron orbits and show good agreement. Similarly to the Zr isotopes, the abrupt shape transition in the Sr isotopes near neutron number N = 60 is identified as being caused by many-proton excitations to its g9/2 orbit.

U2 - 10.1103/PhysRevC.95.054319

DO - 10.1103/PhysRevC.95.054319

M3 - Article

SN - 2469-9985

VL - 95

JO - Physical Review C

JF - Physical Review C

M1 - 054319

ER -

Abrupt shape transition at neutron number N = 60: B(E2) values in 94,96,98Sr from fast γ–γ timing

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Abrupt shape transition at neutron number N = 60: B(E2) values in ^94,96,98Sr from fast γ–γ timing