In-beam gamma ray and conversion electron study of Fm250

J. E. Bastin; R. D. Herzberg; P. A. Butler; G. D. Jones; R. D. Page; D. G. Jenkins; N. Amzal; P. M.T. Brew; N. J. Hammond; R. D. Humphreys; P. J.C. Ikin; T. Page; P. T. Greenlees; P. M. Jones; R. Julin; S. Juutinen; H. Kankaanpää; A. Keenan; H. Kettunen; P. Kuusiniemi; M. Leino; A. P. Leppänen; M. Muikku; P. Nieminen; P. Rahkila; C. Scholey; J. Uusitalo; E. Bouchez; A. Chatillon; A. Hürstel; W. Korten; Y. Le Coz; Ch Theisen; D. Ackermann; J. Gerl; K. Helariutta; F. P. Hessberger; Ch Schlegel; H. J. Wollerscheim; M. Lach; A. Maj; W. Meczynski; J. Styczen; T. L. Khoo; C. J. Lister; A. V. Afanasjev; H. J. Maier; P. Reiter; P. Bednarczyc; K. Eskola; K. Hauschild

doi:10.1103/PhysRevC.73.024308

In-beam gamma ray and conversion electron study of Fm250

J. E. Bastin^*, R. D. Herzberg, P. A. Butler, G. D. Jones, R. D. Page, D. G. Jenkins, N. Amzal, P. M.T. Brew, N. J. Hammond, R. D. Humphreys, P. J.C. Ikin, T. Page, P. T. Greenlees, P. M. Jones, R. Julin, S. Juutinen, H. Kankaanpää, A. Keenan, H. Kettunen, P. KuusiniemiM. Leino, A. P. Leppänen, M. Muikku, P. Nieminen, P. Rahkila, C. Scholey, J. Uusitalo, E. Bouchez, A. Chatillon, A. Hürstel, W. Korten, Y. Le Coz, Ch Theisen, D. Ackermann, J. Gerl, K. Helariutta, F. P. Hessberger, Ch Schlegel, H. J. Wollerscheim, M. Lach, A. Maj, W. Meczynski, J. Styczen, T. L. Khoo, C. J. Lister, A. V. Afanasjev, H. J. Maier, P. Reiter, P. Bednarczyc, K. Eskola, K. Hauschild

^*Corresponding author for this work

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

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Abstract

We report on a set of in-beam studies of excited states in Fm250. We detected prompt γ rays by using the JUROSPHERE IV array and conversion electrons by using the SACRED spectrometer. Both devices were used in conjunction with the RITU gas-filled recoil separator located at the University of Jyväskylä. Fm250 nuclei were produced through the Hg204(Ca48,2n)Fm250 fusion-evaporation reaction. An experimental excitation function gave a maximum reaction cross section of (980 ± 160) nb at an energy of 209 MeV in the center of the target. Tagging techniques were employed, and a number of E2 transitions were observed that connected the ground-state band levels from spin 4+ up to 18+. The highly converted 4+→2+ transition is observed only by use of conversion electron spectroscopy. The observed ground-state band transitions indicate a rotational structure. We deduce a quadrupole deformation parameter of β2=0.28 ± 0.02. A low-energy background of apparent nuclear origin is observed in conversion electrons and postulated to arise from the decay of high-K bands. The half-life of Fm250 is measured to be 30.4 ± 1.5 min.

Original language	English
Article number	024308
Journal	Physical Review C - Nuclear Physics
Volume	73
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.73.024308
Publication status	Published - 2006
Externally published	Yes

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Bastin, J. E., Herzberg, R. D., Butler, P. A., Jones, G. D., Page, R. D., Jenkins, D. G., Amzal, N., Brew, P. M. T., Hammond, N. J., Humphreys, R. D., Ikin, P. J. C., Page, T., Greenlees, P. T., Jones, P. M., Julin, R., Juutinen, S., Kankaanpää, H., Keenan, A., Kettunen, H., ... Hauschild, K. (2006). In-beam gamma ray and conversion electron study of Fm250. Physical Review C - Nuclear Physics, 73(2), Article 024308. https://doi.org/10.1103/PhysRevC.73.024308

@article{a8a9b66d0847470c96a259aadda03f35,

title = "In-beam gamma ray and conversion electron study of Fm250",

abstract = "We report on a set of in-beam studies of excited states in Fm250. We detected prompt γ rays by using the JUROSPHERE IV array and conversion electrons by using the SACRED spectrometer. Both devices were used in conjunction with the RITU gas-filled recoil separator located at the University of Jyv{\"a}skyl{\"a}. Fm250 nuclei were produced through the Hg204(Ca48,2n)Fm250 fusion-evaporation reaction. An experimental excitation function gave a maximum reaction cross section of (980 ± 160) nb at an energy of 209 MeV in the center of the target. Tagging techniques were employed, and a number of E2 transitions were observed that connected the ground-state band levels from spin 4+ up to 18+. The highly converted 4+→2+ transition is observed only by use of conversion electron spectroscopy. The observed ground-state band transitions indicate a rotational structure. We deduce a quadrupole deformation parameter of β2=0.28 ± 0.02. A low-energy background of apparent nuclear origin is observed in conversion electrons and postulated to arise from the decay of high-K bands. The half-life of Fm250 is measured to be 30.4 ± 1.5 min.",

author = "Bastin, \{J. E.\} and Herzberg, \{R. D.\} and Butler, \{P. A.\} and Jones, \{G. D.\} and Page, \{R. D.\} and Jenkins, \{D. G.\} and N. Amzal and Brew, \{P. M.T.\} and Hammond, \{N. J.\} and Humphreys, \{R. D.\} and Ikin, \{P. J.C.\} and T. Page and Greenlees, \{P. T.\} and Jones, \{P. M.\} and R. Julin and S. Juutinen and H. Kankaanp{\"a}{\"a} and A. Keenan and H. Kettunen and P. Kuusiniemi and M. Leino and Lepp{\"a}nen, \{A. P.\} and M. Muikku and P. Nieminen and P. Rahkila and C. Scholey and J. Uusitalo and E. Bouchez and A. Chatillon and A. H{\"u}rstel and W. Korten and Coz, \{Y. Le\} and Ch Theisen and D. Ackermann and J. Gerl and K. Helariutta and Hessberger, \{F. P.\} and Ch Schlegel and Wollerscheim, \{H. J.\} and M. Lach and A. Maj and W. Meczynski and J. Styczen and Khoo, \{T. L.\} and Lister, \{C. J.\} and Afanasjev, \{A. V.\} and Maier, \{H. J.\} and P. Reiter and P. Bednarczyc and K. Eskola and K. Hauschild",

year = "2006",

doi = "10.1103/PhysRevC.73.024308",

language = "English",

volume = "73",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "2",

}

Bastin, JE, Herzberg, RD, Butler, PA, Jones, GD, Page, RD, Jenkins, DG, Amzal, N, Brew, PMT, Hammond, NJ, Humphreys, RD, Ikin, PJC, Page, T, Greenlees, PT, Jones, PM, Julin, R, Juutinen, S, Kankaanpää, H, Keenan, A, Kettunen, H, Kuusiniemi, P, Leino, M, Leppänen, AP, Muikku, M, Nieminen, P, Rahkila, P, Scholey, C, Uusitalo, J, Bouchez, E, Chatillon, A, Hürstel, A, Korten, W, Coz, YL, Theisen, C, Ackermann, D, Gerl, J, Helariutta, K, Hessberger, FP, Schlegel, C, Wollerscheim, HJ, Lach, M, Maj, A, Meczynski, W, Styczen, J, Khoo, TL, Lister, CJ, Afanasjev, AV, Maier, HJ, Reiter, P, Bednarczyc, P, Eskola, K & Hauschild, K 2006, 'In-beam gamma ray and conversion electron study of Fm250', Physical Review C - Nuclear Physics, vol. 73, no. 2, 024308. https://doi.org/10.1103/PhysRevC.73.024308

TY - JOUR

T1 - In-beam gamma ray and conversion electron study of Fm250

AU - Bastin, J. E.

AU - Herzberg, R. D.

AU - Butler, P. A.

AU - Jones, G. D.

AU - Page, R. D.

AU - Jenkins, D. G.

AU - Amzal, N.

AU - Brew, P. M.T.

AU - Hammond, N. J.

AU - Humphreys, R. D.

AU - Ikin, P. J.C.

AU - Page, T.

AU - Greenlees, P. T.

AU - Jones, P. M.

AU - Julin, R.

AU - Juutinen, S.

AU - Kankaanpää, H.

AU - Keenan, A.

AU - Kettunen, H.

AU - Kuusiniemi, P.

AU - Leino, M.

AU - Leppänen, A. P.

AU - Muikku, M.

AU - Nieminen, P.

AU - Rahkila, P.

AU - Scholey, C.

AU - Uusitalo, J.

AU - Bouchez, E.

AU - Chatillon, A.

AU - Hürstel, A.

AU - Korten, W.

AU - Coz, Y. Le

AU - Theisen, Ch

AU - Ackermann, D.

AU - Gerl, J.

AU - Helariutta, K.

AU - Hessberger, F. P.

AU - Schlegel, Ch

AU - Wollerscheim, H. J.

AU - Lach, M.

AU - Maj, A.

AU - Meczynski, W.

AU - Styczen, J.

AU - Khoo, T. L.

AU - Lister, C. J.

AU - Afanasjev, A. V.

AU - Maier, H. J.

AU - Reiter, P.

AU - Bednarczyc, P.

AU - Eskola, K.

AU - Hauschild, K.

PY - 2006

Y1 - 2006

N2 - We report on a set of in-beam studies of excited states in Fm250. We detected prompt γ rays by using the JUROSPHERE IV array and conversion electrons by using the SACRED spectrometer. Both devices were used in conjunction with the RITU gas-filled recoil separator located at the University of Jyväskylä. Fm250 nuclei were produced through the Hg204(Ca48,2n)Fm250 fusion-evaporation reaction. An experimental excitation function gave a maximum reaction cross section of (980 ± 160) nb at an energy of 209 MeV in the center of the target. Tagging techniques were employed, and a number of E2 transitions were observed that connected the ground-state band levels from spin 4+ up to 18+. The highly converted 4+→2+ transition is observed only by use of conversion electron spectroscopy. The observed ground-state band transitions indicate a rotational structure. We deduce a quadrupole deformation parameter of β2=0.28 ± 0.02. A low-energy background of apparent nuclear origin is observed in conversion electrons and postulated to arise from the decay of high-K bands. The half-life of Fm250 is measured to be 30.4 ± 1.5 min.

AB - We report on a set of in-beam studies of excited states in Fm250. We detected prompt γ rays by using the JUROSPHERE IV array and conversion electrons by using the SACRED spectrometer. Both devices were used in conjunction with the RITU gas-filled recoil separator located at the University of Jyväskylä. Fm250 nuclei were produced through the Hg204(Ca48,2n)Fm250 fusion-evaporation reaction. An experimental excitation function gave a maximum reaction cross section of (980 ± 160) nb at an energy of 209 MeV in the center of the target. Tagging techniques were employed, and a number of E2 transitions were observed that connected the ground-state band levels from spin 4+ up to 18+. The highly converted 4+→2+ transition is observed only by use of conversion electron spectroscopy. The observed ground-state band transitions indicate a rotational structure. We deduce a quadrupole deformation parameter of β2=0.28 ± 0.02. A low-energy background of apparent nuclear origin is observed in conversion electrons and postulated to arise from the decay of high-K bands. The half-life of Fm250 is measured to be 30.4 ± 1.5 min.

UR - https://www.scopus.com/pages/publications/33244478784

U2 - 10.1103/PhysRevC.73.024308

DO - 10.1103/PhysRevC.73.024308

M3 - Article

SN - 0556-2813

VL - 73

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 2

M1 - 024308

ER -

In-beam gamma ray and conversion electron study of Fm250

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