Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr

S. Ansari, J.-M. Régis, J. Jolie, N. Saed-Samii, N. Warr, W. Korten, M. Zielińska, M.-D. Salsac, A. Blanc, M. Jentschel, U. Köster, P. Mutti, T. Soldner, G. S. Simpson, F. Drouet, A. Vancraeyenest, G. De France, E. Clément, O. Stezowski, C. A. Ur & 26 others W. Urban, P. H. Regan, Zs. Podolyák, C. Larijani, C. Townsley, R. Carroll, E. Wilson, H. Mach, L.M. Fraile, V. Paziy, B. Olaizola, V. Vedia, A. M. Bruce, O. J. Roberts, J. F. Smith, M. Scheck, T. Kröll, A.-L. Hartig, A. Ignatov, S. Ilieva, S. Lalkovski, N. Mărginean, T. Otsuka, N. Shimizu, T. Togashi, Y. Tsunoda

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Abstract

Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in N≤58 nuclei are nearly spherical, while those with N≥60 have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with LaBr3(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region. We used neutron-induced fission of 241Pu and 235U to study lifetimes of excited states in fission fragments in the A∼100 region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei 98Zr (N = 58), 100Zr, and 102Zr (N≥60). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model.
Original languageEnglish
Article number054323
JournalPhysical Review C
Volume96
Issue number5
DOIs
Publication statusPublished - 27 Nov 2017

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neutrons
life (durability)
nuclei
fission
cold neutrons
neutron beams
ingredients
centroids
scintillation counters
bosons
time measurement
fragments
ground state
excitation

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Ansari, S., Régis, J-M., Jolie, J., Saed-Samii, N., Warr, N., Korten, W., ... Tsunoda, Y. (2017). Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr. Physical Review C, 96(5), [054323 ]. https://doi.org/10.1103/PhysRevC.96.054323
Ansari, S. ; Régis, J.-M. ; Jolie, J. ; Saed-Samii, N. ; Warr, N. ; Korten, W. ; Zielińska, M. ; Salsac, M.-D. ; Blanc, A. ; Jentschel, M. ; Köster, U. ; Mutti, P. ; Soldner, T. ; Simpson, G. S. ; Drouet, F. ; Vancraeyenest, A. ; De France, G. ; Clément, E. ; Stezowski, O. ; Ur, C. A. ; Urban, W. ; Regan, P. H. ; Podolyák, Zs. ; Larijani, C. ; Townsley, C. ; Carroll, R. ; Wilson, E. ; Mach, H. ; Fraile, L.M. ; Paziy, V. ; Olaizola, B. ; Vedia, V. ; Bruce, A. M. ; Roberts, O. J. ; Smith, J. F. ; Scheck, M. ; Kröll, T. ; Hartig, A.-L. ; Ignatov, A. ; Ilieva, S. ; Lalkovski, S. ; Mărginean, N. ; Otsuka, T. ; Shimizu, N. ; Togashi, T. ; Tsunoda, Y. / Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr. In: Physical Review C. 2017 ; Vol. 96, No. 5.
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title = "Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr",
abstract = "Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in N≤58 nuclei are nearly spherical, while those with N≥60 have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with LaBr3(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region. We used neutron-induced fission of 241Pu and 235U to study lifetimes of excited states in fission fragments in the A∼100 region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei 98Zr (N = 58), 100Zr, and 102Zr (N≥60). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model.",
author = "S. Ansari and J.-M. R{\'e}gis and J. Jolie and N. Saed-Samii and N. Warr and W. Korten and M. Zielińska and M.-D. Salsac and A. Blanc and M. Jentschel and U. K{\"o}ster and P. Mutti and T. Soldner and Simpson, {G. S.} and F. Drouet and A. Vancraeyenest and {De France}, G. and E. Cl{\'e}ment and O. Stezowski and Ur, {C. A.} and W. Urban and Regan, {P. H.} and Zs. Podoly{\'a}k and C. Larijani and C. Townsley and R. Carroll and E. Wilson and H. Mach and L.M. Fraile and V. Paziy and B. Olaizola and V. Vedia and Bruce, {A. M.} and Roberts, {O. J.} and Smith, {J. F.} and M. Scheck and T. Kr{\"o}ll and A.-L. Hartig and A. Ignatov and S. Ilieva and S. Lalkovski and N. Mărginean and T. Otsuka and N. Shimizu and T. Togashi and Y. Tsunoda",
year = "2017",
month = "11",
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doi = "10.1103/PhysRevC.96.054323",
language = "English",
volume = "96",
journal = "Physical Review C",
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Ansari, S, Régis, J-M, Jolie, J, Saed-Samii, N, Warr, N, Korten, W, Zielińska, M, Salsac, M-D, Blanc, A, Jentschel, M, Köster, U, Mutti, P, Soldner, T, Simpson, GS, Drouet, F, Vancraeyenest, A, De France, G, Clément, E, Stezowski, O, Ur, CA, Urban, W, Regan, PH, Podolyák, Z, Larijani, C, Townsley, C, Carroll, R, Wilson, E, Mach, H, Fraile, LM, Paziy, V, Olaizola, B, Vedia, V, Bruce, AM, Roberts, OJ, Smith, JF, Scheck, M, Kröll, T, Hartig, A-L, Ignatov, A, Ilieva, S, Lalkovski, S, Mărginean, N, Otsuka, T, Shimizu, N, Togashi, T & Tsunoda, Y 2017, 'Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr' Physical Review C, vol. 96, no. 5, 054323 . https://doi.org/10.1103/PhysRevC.96.054323

Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr. / Ansari, S.; Régis, J.-M.; Jolie, J.; Saed-Samii, N.; Warr, N.; Korten, W.; Zielińska, M.; Salsac, M.-D.; Blanc, A.; Jentschel, M.; Köster, U.; Mutti, P.; Soldner, T.; Simpson, G. S.; Drouet, F.; Vancraeyenest, A.; De France, G.; Clément, E.; Stezowski, O.; Ur, C. A.; Urban, W.; Regan, P. H.; Podolyák, Zs.; Larijani, C.; Townsley, C.; Carroll, R.; Wilson, E.; Mach, H.; Fraile, L.M.; Paziy, V.; Olaizola, B.; Vedia, V.; Bruce, A. M.; Roberts, O. J.; Smith, J. F.; Scheck, M.; Kröll, T.; Hartig, A.-L.; Ignatov, A.; Ilieva, S.; Lalkovski, S.; Mărginean, N.; Otsuka, T.; Shimizu, N.; Togashi, T.; Tsunoda, Y.

In: Physical Review C, Vol. 96, No. 5, 054323 , 27.11.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr

AU - Ansari, S.

AU - Régis, J.-M.

AU - Jolie, J.

AU - Saed-Samii, N.

AU - Warr, N.

AU - Korten, W.

AU - Zielińska, M.

AU - Salsac, M.-D.

AU - Blanc, A.

AU - Jentschel, M.

AU - Köster, U.

AU - Mutti, P.

AU - Soldner, T.

AU - Simpson, G. S.

AU - Drouet, F.

AU - Vancraeyenest, A.

AU - De France, G.

AU - Clément, E.

AU - Stezowski, O.

AU - Ur, C. A.

AU - Urban, W.

AU - Regan, P. H.

AU - Podolyák, Zs.

AU - Larijani, C.

AU - Townsley, C.

AU - Carroll, R.

AU - Wilson, E.

AU - Mach, H.

AU - Fraile, L.M.

AU - Paziy, V.

AU - Olaizola, B.

AU - Vedia, V.

AU - Bruce, A. M.

AU - Roberts, O. J.

AU - Smith, J. F.

AU - Scheck, M.

AU - Kröll, T.

AU - Hartig, A.-L.

AU - Ignatov, A.

AU - Ilieva, S.

AU - Lalkovski, S.

AU - Mărginean, N.

AU - Otsuka, T.

AU - Shimizu, N.

AU - Togashi, T.

AU - Tsunoda, Y.

PY - 2017/11/27

Y1 - 2017/11/27

N2 - Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in N≤58 nuclei are nearly spherical, while those with N≥60 have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with LaBr3(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region. We used neutron-induced fission of 241Pu and 235U to study lifetimes of excited states in fission fragments in the A∼100 region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei 98Zr (N = 58), 100Zr, and 102Zr (N≥60). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model.

AB - Rapid shape changes are observed for neutron-rich nuclei with A around 100. In particular, a sudden onset of ground-state deformation is observed in the Zr and Sr isotopic chains at N = 60: Low-lying states in N≤58 nuclei are nearly spherical, while those with N≥60 have a rotational character. Nuclear lifetimes as short as a few picoseconds can be measured using fast-timing techniques with LaBr3(Ce) scintillators, yielding a key ingredient in the systematic study of the shape evolution in this region. We used neutron-induced fission of 241Pu and 235U to study lifetimes of excited states in fission fragments in the A∼100 region with the EXILL-FATIMA array located at the PF1B cold neutron beam line at the Institut Laue-Langevin. In particular, we applied the generalized centroid difference method to deduce lifetimes of low-lying states for the nuclei 98Zr (N = 58), 100Zr, and 102Zr (N≥60). The results are discussed in the context of the presumed phase transition in the Zr chain by comparing the experimental transition strengths with the theoretical calculations using the interacting boson model and the Monte Carlo shell model.

U2 - 10.1103/PhysRevC.96.054323

DO - 10.1103/PhysRevC.96.054323

M3 - Article

VL - 96

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 5

M1 - 054323

ER -

Ansari S, Régis J-M, Jolie J, Saed-Samii N, Warr N, Korten W et al. Experimental study of the lifetime and phase transition in neutron-rich 98,100,102Zr. Physical Review C. 2017 Nov 27;96(5). 054323 . https://doi.org/10.1103/PhysRevC.96.054323