Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk

J. Konki; J. Khuyagbaatar; J. Uusitalo; P. T. Greenlees; K. Auranen; H. Badran; M. Block; R. Briselet; D. M. Cox; M. Dasgupta; A. Di Nitto; Ch E. Düllmann; T. Grahn; K. Hauschild; A. Herzán; R. D. Herzberg; F. P. Heßberger; D. J. Hinde; R. Julin; S. Juutinen; E. Jäger; B. Kindler; J. Krier; M. Leino; B. Lommel; A. Lopez-Martens; D. H. Luong; M. Mallaburn; K. Nishio; J. Pakarinen; P. Papadakis; J. Partanen; P. Peura; P. Rahkila; K. Rezynkina; P. Ruotsalainen; M. Sandzelius; J. Sarén; C. Scholey; J. Sorri; S. Stolze; B. Sulignano; Ch Theisen; A. Ward; A. Yakushev; V. Yakusheva

doi:10.1016/j.physletb.2016.11.038

Towards saturation of the electron-capture delayed fission probability: The new isotopes ²⁴⁰Es and ²³⁶Bk

J. Konki, J. Khuyagbaatar^*, J. Uusitalo, P. T. Greenlees, K. Auranen, H. Badran, M. Block, R. Briselet, D. M. Cox, M. Dasgupta, A. Di Nitto, Ch E. Düllmann, T. Grahn, K. Hauschild, A. Herzán, R. D. Herzberg, F. P. Heßberger, D. J. Hinde, R. Julin, S. JuutinenE. Jäger, B. Kindler, J. Krier, M. Leino, B. Lommel, A. Lopez-Martens, D. H. Luong, M. Mallaburn, K. Nishio, J. Pakarinen, P. Papadakis, J. Partanen, P. Peura, P. Rahkila, K. Rezynkina, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, S. Stolze, B. Sulignano, Ch Theisen, A. Ward, A. Yakushev, V. Yakusheva

^*Corresponding author for this work

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

22 Citations (Scopus)

Abstract

The new neutron-deficient nuclei ²⁴⁰Es and ²³⁶Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from ²⁴⁰Es produced in the fusion–evaporation reaction ²⁰⁹Bi(³⁴S,3n)²⁴⁰Es. Half-lives of 6(2)s and 22₋₆ ⁺¹³s were obtained for ²⁴⁰Es and ²³⁶Bk, respectively. Two groups of α particles with energies E_α=8.19(3)MeV and 8.09(3)MeV were unambiguously assigned to ²⁴⁰Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for ²⁴⁰Es and ²³⁶Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.

Original language	English
Pages (from-to)	265-270
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	764
DOIs	https://doi.org/10.1016/j.physletb.2016.11.038
Publication status	Published - 10 Jan 2017

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Konki, J., Khuyagbaatar, J., Uusitalo, J., Greenlees, P. T., Auranen, K., Badran, H., Block, M., Briselet, R., Cox, D. M., Dasgupta, M., Di Nitto, A., Düllmann, C. E., Grahn, T., Hauschild, K., Herzán, A., Herzberg, R. D., Heßberger, F. P., Hinde, D. J., Julin, R., ... Yakusheva, V. (2017). Towards saturation of the electron-capture delayed fission probability: The new isotopes ²⁴⁰Es and ²³⁶Bk. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 764, 265-270. https://doi.org/10.1016/j.physletb.2016.11.038

@article{4e81315c68214506b083762867b5a55b,

title = "Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk",

abstract = "The new neutron-deficient nuclei 240Es and 236Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240Es produced in the fusion–evaporation reaction 209Bi(34S,3n)240Es. Half-lives of 6(2)s and 22−6 +13s were obtained for 240Es and 236Bk, respectively. Two groups of α particles with energies Eα=8.19(3)MeV and 8.09(3)MeV were unambiguously assigned to 240Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for 240Es and 236Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.",

keywords = "Bk, Electron-capture delayed fission, Es, Fusion–evaporation reactions, Isotopes with mass 236–240, α decay",

author = "J. Konki and J. Khuyagbaatar and J. Uusitalo and Greenlees, {P. T.} and K. Auranen and H. Badran and M. Block and R. Briselet and Cox, {D. M.} and M. Dasgupta and {Di Nitto}, A. and D{\"u}llmann, {Ch E.} and T. Grahn and K. Hauschild and A. Herz{\'a}n and Herzberg, {R. D.} and He{\ss}berger, {F. P.} and Hinde, {D. J.} and R. Julin and S. Juutinen and E. J{\"a}ger and B. Kindler and J. Krier and M. Leino and B. Lommel and A. Lopez-Martens and Luong, {D. H.} and M. Mallaburn and K. Nishio and J. Pakarinen and P. Papadakis and J. Partanen and P. Peura and P. Rahkila and K. Rezynkina and P. Ruotsalainen and M. Sandzelius and J. Sar{\'e}n and C. Scholey and J. Sorri and S. Stolze and B. Sulignano and Ch Theisen and A. Ward and A. Yakushev and V. Yakusheva",

note = "Publisher Copyright: {\textcopyright} 2016 The Authors",

year = "2017",

month = jan,

day = "10",

doi = "10.1016/j.physletb.2016.11.038",

language = "English",

volume = "764",

pages = "265--270",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

Konki, J, Khuyagbaatar, J, Uusitalo, J, Greenlees, PT, Auranen, K, Badran, H, Block, M, Briselet, R, Cox, DM, Dasgupta, M, Di Nitto, A, Düllmann, CE, Grahn, T, Hauschild, K, Herzán, A, Herzberg, RD, Heßberger, FP, Hinde, DJ, Julin, R, Juutinen, S, Jäger, E, Kindler, B, Krier, J, Leino, M, Lommel, B, Lopez-Martens, A, Luong, DH, Mallaburn, M, Nishio, K, Pakarinen, J, Papadakis, P, Partanen, J, Peura, P, Rahkila, P, Rezynkina, K, Ruotsalainen, P, Sandzelius, M, Sarén, J, Scholey, C, Sorri, J, Stolze, S, Sulignano, B, Theisen, C, Ward, A, Yakushev, A & Yakusheva, V 2017, 'Towards saturation of the electron-capture delayed fission probability: The new isotopes ²⁴⁰Es and ²³⁶Bk', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 764, pp. 265-270. https://doi.org/10.1016/j.physletb.2016.11.038

TY - JOUR

T1 - Towards saturation of the electron-capture delayed fission probability

T2 - The new isotopes 240Es and 236Bk

AU - Konki, J.

AU - Khuyagbaatar, J.

AU - Uusitalo, J.

AU - Greenlees, P. T.

AU - Auranen, K.

AU - Badran, H.

AU - Block, M.

AU - Briselet, R.

AU - Cox, D. M.

AU - Dasgupta, M.

AU - Di Nitto, A.

AU - Düllmann, Ch E.

AU - Grahn, T.

AU - Hauschild, K.

AU - Herzán, A.

AU - Herzberg, R. D.

AU - Heßberger, F. P.

AU - Hinde, D. J.

AU - Julin, R.

AU - Juutinen, S.

AU - Jäger, E.

AU - Kindler, B.

AU - Krier, J.

AU - Leino, M.

AU - Lommel, B.

AU - Lopez-Martens, A.

AU - Luong, D. H.

AU - Mallaburn, M.

AU - Nishio, K.

AU - Pakarinen, J.

AU - Papadakis, P.

AU - Partanen, J.

AU - Peura, P.

AU - Rahkila, P.

AU - Rezynkina, K.

AU - Ruotsalainen, P.

AU - Sandzelius, M.

AU - Sarén, J.

AU - Scholey, C.

AU - Sorri, J.

AU - Stolze, S.

AU - Sulignano, B.

AU - Theisen, Ch

AU - Ward, A.

AU - Yakushev, A.

AU - Yakusheva, V.

PY - 2017/1/10

Y1 - 2017/1/10

N2 - The new neutron-deficient nuclei 240Es and 236Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240Es produced in the fusion–evaporation reaction 209Bi(34S,3n)240Es. Half-lives of 6(2)s and 22−6 +13s were obtained for 240Es and 236Bk, respectively. Two groups of α particles with energies Eα=8.19(3)MeV and 8.09(3)MeV were unambiguously assigned to 240Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for 240Es and 236Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.

AB - The new neutron-deficient nuclei 240Es and 236Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240Es produced in the fusion–evaporation reaction 209Bi(34S,3n)240Es. Half-lives of 6(2)s and 22−6 +13s were obtained for 240Es and 236Bk, respectively. Two groups of α particles with energies Eα=8.19(3)MeV and 8.09(3)MeV were unambiguously assigned to 240Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for 240Es and 236Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.

KW - Bk

KW - Electron-capture delayed fission

KW - Es

KW - Fusion–evaporation reactions

KW - Isotopes with mass 236–240

KW - α decay

UR - http://www.scopus.com/inward/record.url?scp=85002398087&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2016.11.038

DO - 10.1016/j.physletb.2016.11.038

M3 - Article

SN - 0370-2693

VL - 764

SP - 265

EP - 270

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Towards saturation of the electron-capture delayed fission probability: The new isotopes ²⁴⁰Es and ²³⁶Bk

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