Lifetimes of the 4+1 states of 206Po and 204Po: a study of the transition from noncollective seniority-like mode to collectivity

M. Stoyanova; G. Rainovski; J. Jolie; N. Pietralla; A. Blazhev; M. Beckers; A. Dewald; M. Djongolov; A. Esmaylzadeh; C. Fransen; L.M. Gerhard; K.A. Gladnishki; S. Herb; P.R. John; V. Karayonchev; J.M. Keatings; R. Kern; L. Knafla; D. Kocheva; L. Kornwebel; Th. Kröll; M. Ley; K.M. Mashtakov; C. Müller-Gatermann; J.-M. Régis; M. Scheck; K. Schomacker; J. Sinclair; P. Spagnoletti; C. Sürder; N. Warr; V. Werner; J. Wiederhold

doi:10.1103/PhysRevC.100.064304

Lifetimes of the 4⁺₁states of ²⁰⁶Po and ²⁰⁴Po: a study of the transition from noncollective seniority-like mode to collectivity

M. Stoyanova, G. Rainovski^*, J. Jolie, N. Pietralla, A. Blazhev, M. Beckers, A. Dewald, M. Djongolov, A. Esmaylzadeh, C. Fransen, L.M. Gerhard, K.A. Gladnishki, S. Herb, P.R. John, V. Karayonchev, J.M. Keatings, R. Kern, L. Knafla, D. Kocheva, L. KornwebelTh. Kröll, M. Ley, K.M. Mashtakov, C. Müller-Gatermann, J.-M. Régis, M. Scheck, K. Schomacker, J. Sinclair, P. Spagnoletti, C. Sürder, N. Warr, V. Werner, J. Wiederhold

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

117 Downloads (Pure)

Abstract

Low-lying yrast states of ²⁰⁴Po and ²⁰⁶Po were investigated by the γ–γ fast timing technique with LaBr₃(Ce) detectors. Excited states of these nuclei were populated in the ¹⁹⁷Au(¹¹B,4n) ²⁰⁴Po and the ¹⁹⁸Pt(¹²C,4n) ²⁰⁶Po fusion-evaporation reactions, respectively. The beams were delivered by the FN-Tandem accelerator at the University of Cologne. The lifetimes of the 4⁺₁ states of both nuclei were measured, along with an upper lifetime limit for the 2⁺₁ state of ²⁰⁴Po. A comparison between the derived B(E2;4⁺₁→2⁺₁) values and results from simplified empirical two-state mixing calculations suggests that for the 4⁺₁states of even-even polonium isotopes the transition from single-particle mode at N = 126 to collective mode, when reducing the number of neutrons, occurs above N = 122.

Original language	English
Article number	064304
Pages (from-to)	064304
Journal	Physical Review C
Volume	100
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.100.064304
Publication status	Published - 6 Dec 2019

Access to Document

10.1103/PhysRevC.100.064304

2019 11 21 Stoyanova et al Lifetimes acceptedAccepted author manuscript, 402 KB

Cite this

Stoyanova, M., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Beckers, M., Dewald, A., Djongolov, M., Esmaylzadeh, A., Fransen, C., Gerhard, L. M., Gladnishki, K. A., Herb, S., John, P. R., Karayonchev, V., Keatings, J. M., Kern, R., Knafla, L., Kocheva, D., ... Wiederhold, J. (2019). Lifetimes of the 4⁺₁states of ²⁰⁶Po and ²⁰⁴Po: a study of the transition from noncollective seniority-like mode to collectivity. Physical Review C, 100(6), 064304. Article 064304. https://doi.org/10.1103/PhysRevC.100.064304

@article{be70e459947346b7936f9ec35b0f88c6,

title = "Lifetimes of the 4+1 states of 206Po and 204Po: a study of the transition from noncollective seniority-like mode to collectivity",

abstract = "Low-lying yrast states of 204Po and 206Po were investigated by the γ–γ fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the 197Au(11B,4n) 204Po and the 198Pt(12C,4n) 206Po fusion-evaporation reactions, respectively. The beams were delivered by the FN-Tandem accelerator at the University of Cologne. The lifetimes of the 4+1 states of both nuclei were measured, along with an upper lifetime limit for the 2+1 state of 204Po. A comparison between the derived B(E2;4+1→2+1) values and results from simplified empirical two-state mixing calculations suggests that for the 4+1 states of even-even polonium isotopes the transition from single-particle mode at N = 126 to collective mode, when reducing the number of neutrons, occurs above N = 122.",

author = "M. Stoyanova and G. Rainovski and J. Jolie and N. Pietralla and A. Blazhev and M. Beckers and A. Dewald and M. Djongolov and A. Esmaylzadeh and C. Fransen and L.M. Gerhard and K.A. Gladnishki and S. Herb and P.R. John and V. Karayonchev and J.M. Keatings and R. Kern and L. Knafla and D. Kocheva and L. Kornwebel and Th. Kr{\"o}ll and M. Ley and K.M. Mashtakov and C. M{\"u}ller-Gatermann and J.-M. R{\'e}gis and M. Scheck and K. Schomacker and J. Sinclair and P. Spagnoletti and C. S{\"u}rder and N. Warr and V. Werner and J. Wiederhold",

year = "2019",

month = dec,

day = "6",

doi = "10.1103/PhysRevC.100.064304",

language = "English",

volume = "100",

pages = "064304",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "6",

}

Stoyanova, M, Rainovski, G, Jolie, J, Pietralla, N, Blazhev, A, Beckers, M, Dewald, A, Djongolov, M, Esmaylzadeh, A, Fransen, C, Gerhard, LM, Gladnishki, KA, Herb, S, John, PR, Karayonchev, V, Keatings, JM, Kern, R, Knafla, L, Kocheva, D, Kornwebel, L, Kröll, T, Ley, M, Mashtakov, KM, Müller-Gatermann, C, Régis, J-M, Scheck, M, Schomacker, K, Sinclair, J, Spagnoletti, P, Sürder, C, Warr, N, Werner, V & Wiederhold, J 2019, 'Lifetimes of the 4⁺₁states of ²⁰⁶Po and ²⁰⁴Po: a study of the transition from noncollective seniority-like mode to collectivity', Physical Review C, vol. 100, no. 6, 064304, pp. 064304. https://doi.org/10.1103/PhysRevC.100.064304

TY - JOUR

T1 - Lifetimes of the 4+1 states of 206Po and 204Po

T2 - a study of the transition from noncollective seniority-like mode to collectivity

AU - Stoyanova, M.

AU - Rainovski, G.

AU - Jolie, J.

AU - Pietralla, N.

AU - Blazhev, A.

AU - Beckers, M.

AU - Dewald, A.

AU - Djongolov, M.

AU - Esmaylzadeh, A.

AU - Fransen, C.

AU - Gerhard, L.M.

AU - Gladnishki, K.A.

AU - Herb, S.

AU - John, P.R.

AU - Karayonchev, V.

AU - Keatings, J.M.

AU - Kern, R.

AU - Knafla, L.

AU - Kocheva, D.

AU - Kornwebel, L.

AU - Kröll, Th.

AU - Ley, M.

AU - Mashtakov, K.M.

AU - Müller-Gatermann, C.

AU - Régis, J.-M.

AU - Scheck, M.

AU - Schomacker, K.

AU - Sinclair, J.

AU - Spagnoletti, P.

AU - Sürder, C.

AU - Warr, N.

AU - Werner, V.

AU - Wiederhold, J.

PY - 2019/12/6

Y1 - 2019/12/6

N2 - Low-lying yrast states of 204Po and 206Po were investigated by the γ–γ fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the 197Au(11B,4n) 204Po and the 198Pt(12C,4n) 206Po fusion-evaporation reactions, respectively. The beams were delivered by the FN-Tandem accelerator at the University of Cologne. The lifetimes of the 4+1 states of both nuclei were measured, along with an upper lifetime limit for the 2+1 state of 204Po. A comparison between the derived B(E2;4+1→2+1) values and results from simplified empirical two-state mixing calculations suggests that for the 4+1 states of even-even polonium isotopes the transition from single-particle mode at N = 126 to collective mode, when reducing the number of neutrons, occurs above N = 122.

AB - Low-lying yrast states of 204Po and 206Po were investigated by the γ–γ fast timing technique with LaBr3(Ce) detectors. Excited states of these nuclei were populated in the 197Au(11B,4n) 204Po and the 198Pt(12C,4n) 206Po fusion-evaporation reactions, respectively. The beams were delivered by the FN-Tandem accelerator at the University of Cologne. The lifetimes of the 4+1 states of both nuclei were measured, along with an upper lifetime limit for the 2+1 state of 204Po. A comparison between the derived B(E2;4+1→2+1) values and results from simplified empirical two-state mixing calculations suggests that for the 4+1 states of even-even polonium isotopes the transition from single-particle mode at N = 126 to collective mode, when reducing the number of neutrons, occurs above N = 122.

U2 - 10.1103/PhysRevC.100.064304

DO - 10.1103/PhysRevC.100.064304

M3 - Article

SN - 2469-9985

VL - 100

SP - 064304

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - 064304

ER -

Lifetimes of the 4+1 states of 206Po and 204Po: a study of the transition from noncollective seniority-like mode to collectivity

Abstract

Access to Document

Fingerprint

Cite this

Lifetimes of the 4⁺₁states of ²⁰⁶Po and ²⁰⁴Po: a study of the transition from noncollective seniority-like mode to collectivity