Low collectivity of the 21+ state of 212Po

D. Kocheva; G. Rainovski; J. Jolie; N. Pietralla; A. Blazhev; R. Altenkirch; S. Ansari; A. Astier; M. Bast; M. Beckers; Th. Braunroth; M. Cappellazzo; A. Dewald; F. Diel; M. Djongolov; C. Fransen; K. Gladnishki; A. Goldkuhle; A. Hennig; V. Karayonchev; J. M. Keatings; E. Kluge; Th. Kröll; J. Litzinger; K. Moschner; C. Müller-Gatermann; P. Petkov; M. Scheck; Ph. Scholz; T. Schmidt; P. Spagnoletti; C. Stahl; R. Stegmann; A. Stolz; A. Vogt; N. Warr; V. Werner; D. Wölk; J. C. Zamora; K. O. Zell; V. Yu. Ponomarev; P. Van Isacker

doi:10.1103/PhysRevC.96.044305

Low collectivity of the 2₁⁺ state of ²¹²Po

D. Kocheva, G. Rainovski, J. Jolie, N. Pietralla, A. Blazhev, R. Altenkirch, S. Ansari, A. Astier, M. Bast, M. Beckers, Th. Braunroth, M. Cappellazzo, A. Dewald, F. Diel, M. Djongolov, C. Fransen, K. Gladnishki, A. Goldkuhle, A. Hennig, V. KarayonchevJ. M. Keatings, E. Kluge, Th. Kröll, J. Litzinger, K. Moschner, C. Müller-Gatermann, P. Petkov, M. Scheck, Ph. Scholz, T. Schmidt, P. Spagnoletti, C. Stahl, R. Stegmann, A. Stolz, A. Vogt, N. Warr, V. Werner, D. Wölk, J. C. Zamora, K. O. Zell, V. Yu. Ponomarev, P. Van Isacker

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Abstract

The lifetime of the 2₁⁺ state of ²¹²Po was measured in the ²⁰⁸Pb(¹²C, ⁸Be)²¹²Po transfer reaction by γ-ray spectroscopy employing the recoil distance Doppler shift (RDDS) method. The derived absolute B(E2) value of 2.6(3) W.u. indicates a low collectivity and contradicts previous claims of alpha-cluster components in the structure of the 2₁⁺ state. It is demonstrated that a consistent description of the properties of the 2₁⁺-4₁⁺-6₁⁺-8₁⁺ sequence in ²¹²Po cannot be achieved in the framework of a single-j-shell-model calculation, either. This puzzle is traced to the properties of the seniority-2 configurations in ²¹⁰Pb and ²¹⁰Po.

Original language	English
Article number	044305
Journal	Physical Review C
Volume	96
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.96.044305
Publication status	Published - 5 Oct 2017

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2017 09 11 Kocheva et al Collectivity acceptedAccepted author manuscript, 375 KBLicence: CC BY-NC-ND

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Kocheva, D., Rainovski, G., Jolie, J., Pietralla, N., Blazhev, A., Altenkirch, R., Ansari, S., Astier, A., Bast, M., Beckers, M., Braunroth, T., Cappellazzo, M., Dewald, A., Diel, F., Djongolov, M., Fransen, C., Gladnishki, K., Goldkuhle, A., Hennig, A., ... Van Isacker, P. (2017). Low collectivity of the 2₁⁺ state of ²¹²Po. Physical Review C, 96(4), Article 044305. https://doi.org/10.1103/PhysRevC.96.044305

@article{2083dfdc614a4d32a83842197c925e1a,

title = "Low collectivity of the 21+ state of 212Po",

abstract = "The lifetime of the 21+ state of 212Po was measured in the 208Pb(12C, 8Be)212Po transfer reaction by γ-ray spectroscopy employing the recoil distance Doppler shift (RDDS) method. The derived absolute B(E2) value of 2.6(3) W.u. indicates a low collectivity and contradicts previous claims of alpha-cluster components in the structure of the 21+ state. It is demonstrated that a consistent description of the properties of the 21+-41+-61+-81+ sequence in 212Po cannot be achieved in the framework of a single-j-shell-model calculation, either. This puzzle is traced to the properties of the seniority-2 configurations in 210Pb and 210Po.",

author = "D. Kocheva and G. Rainovski and J. Jolie and N. Pietralla and A. Blazhev and R. Altenkirch and S. Ansari and A. Astier and M. Bast and M. Beckers and Th. Braunroth and M. Cappellazzo and A. Dewald and F. Diel and M. Djongolov and C. Fransen and K. Gladnishki and A. Goldkuhle and A. Hennig and V. Karayonchev and Keatings, {J. M.} and E. Kluge and Th. Kr{\"o}ll and J. Litzinger and K. Moschner and C. M{\"u}ller-Gatermann and P. Petkov and M. Scheck and Ph. Scholz and T. Schmidt and P. Spagnoletti and C. Stahl and R. Stegmann and A. Stolz and A. Vogt and N. Warr and V. Werner and D. W{\"o}lk and Zamora, {J. C.} and Zell, {K. O.} and Ponomarev, {V. Yu.} and {Van Isacker}, P.",

year = "2017",

month = oct,

day = "5",

doi = "10.1103/PhysRevC.96.044305",

language = "English",

volume = "96",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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Kocheva, D, Rainovski, G, Jolie, J, Pietralla, N, Blazhev, A, Altenkirch, R, Ansari, S, Astier, A, Bast, M, Beckers, M, Braunroth, T, Cappellazzo, M, Dewald, A, Diel, F, Djongolov, M, Fransen, C, Gladnishki, K, Goldkuhle, A, Hennig, A, Karayonchev, V, Keatings, JM, Kluge, E, Kröll, T, Litzinger, J, Moschner, K, Müller-Gatermann, C, Petkov, P, Scheck, M, Scholz, P, Schmidt, T, Spagnoletti, P, Stahl, C, Stegmann, R, Stolz, A, Vogt, A, Warr, N, Werner, V, Wölk, D, Zamora, JC, Zell, KO, Ponomarev, VY & Van Isacker, P 2017, 'Low collectivity of the 2₁⁺ state of ²¹²Po', Physical Review C, vol. 96, no. 4, 044305. https://doi.org/10.1103/PhysRevC.96.044305

TY - JOUR

T1 - Low collectivity of the 21+ state of 212Po

AU - Kocheva, D.

AU - Rainovski, G.

AU - Jolie, J.

AU - Pietralla, N.

AU - Blazhev, A.

AU - Altenkirch, R.

AU - Ansari, S.

AU - Astier, A.

AU - Bast, M.

AU - Beckers, M.

AU - Braunroth, Th.

AU - Cappellazzo, M.

AU - Dewald, A.

AU - Diel, F.

AU - Djongolov, M.

AU - Fransen, C.

AU - Gladnishki, K.

AU - Goldkuhle, A.

AU - Hennig, A.

AU - Karayonchev, V.

AU - Keatings, J. M.

AU - Kluge, E.

AU - Kröll, Th.

AU - Litzinger, J.

AU - Moschner, K.

AU - Müller-Gatermann, C.

AU - Petkov, P.

AU - Scheck, M.

AU - Scholz, Ph.

AU - Schmidt, T.

AU - Spagnoletti, P.

AU - Stahl, C.

AU - Stegmann, R.

AU - Stolz, A.

AU - Vogt, A.

AU - Warr, N.

AU - Werner, V.

AU - Wölk, D.

AU - Zamora, J. C.

AU - Zell, K. O.

AU - Ponomarev, V. Yu.

AU - Van Isacker, P.

PY - 2017/10/5

Y1 - 2017/10/5

N2 - The lifetime of the 21+ state of 212Po was measured in the 208Pb(12C, 8Be)212Po transfer reaction by γ-ray spectroscopy employing the recoil distance Doppler shift (RDDS) method. The derived absolute B(E2) value of 2.6(3) W.u. indicates a low collectivity and contradicts previous claims of alpha-cluster components in the structure of the 21+ state. It is demonstrated that a consistent description of the properties of the 21+-41+-61+-81+ sequence in 212Po cannot be achieved in the framework of a single-j-shell-model calculation, either. This puzzle is traced to the properties of the seniority-2 configurations in 210Pb and 210Po.

AB - The lifetime of the 21+ state of 212Po was measured in the 208Pb(12C, 8Be)212Po transfer reaction by γ-ray spectroscopy employing the recoil distance Doppler shift (RDDS) method. The derived absolute B(E2) value of 2.6(3) W.u. indicates a low collectivity and contradicts previous claims of alpha-cluster components in the structure of the 21+ state. It is demonstrated that a consistent description of the properties of the 21+-41+-61+-81+ sequence in 212Po cannot be achieved in the framework of a single-j-shell-model calculation, either. This puzzle is traced to the properties of the seniority-2 configurations in 210Pb and 210Po.

U2 - 10.1103/PhysRevC.96.044305

DO - 10.1103/PhysRevC.96.044305

M3 - Article

SN - 2469-9985

VL - 96

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 044305

ER -

Low collectivity of the 21+ state of 212Po

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Low collectivity of the 2₁⁺ state of ²¹²Po