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22 results on '"Kankaanpaa, H."'

1. Coulomb excitation of 78 Kr

Author

Becker, F., Petrovici, A., Iwanicki, J, Amzal, N., Korten, W, Hauschild, K, Hurstel, A, Theisen, Ch, Butler, P A, Cunningham, R A, Czosnyka, T., de France, G., Gerl, Juergen, Greenlees, P T, Helariutta, K, Herzberg, R, Jones, Peter G, Julin, Rauno Juhani, Juutinen, S, Kankaanpaa, H, Muikku, M, Nieminen, Paivi, Radu, O, Rahkila, P, Schlegel, Ch., Becker, F., Petrovici, A., Iwanicki, J, Amzal, N., Korten, W, Hauschild, K, Hurstel, A, Theisen, Ch, Butler, P A, Cunningham, R A, Czosnyka, T., de France, G., Gerl, Juergen, Greenlees, P T, Helariutta, K, Herzberg, R, Jones, Peter G, Julin, Rauno Juhani, Juutinen, S, Kankaanpaa, H, Muikku, M, Nieminen, Paivi, Radu, O, Rahkila, P, and Schlegel, Ch.

Abstract

The Kr isotopes are considered to be among the best cases for shape coexistence studies in the mass A ∼ 70 region. Our campaign to investigate in detail the development of the shape coexistence in the neutron deficient Kr isotopes was started with the s

Published
2006

2. gamma-ray spectroscopy of Bi-191,Bi-193

Author

Nieminen, P., Juutinen, S., Andreyev, A. N., Cocks, J. F. C., Dorvaux, O., Eskola, K., Greenlees, P. T., Hauschild, K., Helariutta, K., Huyse, M., Jones, P. M., Julin, R., Kankaanpaa, H., Kettunen, H., Kuusiniemi, P., Le Coz, Y., Leino, M., Lonnroth, T., Muikku, M., Rahkila, P., Savelius, A., Uusitalo, J., Amzal, N., Hammond, N. J., Scholey, C., Wyss, Ramon, Nieminen, P., Juutinen, S., Andreyev, A. N., Cocks, J. F. C., Dorvaux, O., Eskola, K., Greenlees, P. T., Hauschild, K., Helariutta, K., Huyse, M., Jones, P. M., Julin, R., Kankaanpaa, H., Kettunen, H., Kuusiniemi, P., Le Coz, Y., Leino, M., Lonnroth, T., Muikku, M., Rahkila, P., Savelius, A., Uusitalo, J., Amzal, N., Hammond, N. J., Scholey, C., and Wyss, Ramon

Abstract

Prompt and delayed gamma rays from Bi-191,Bi-193 have been identified using the recoil-decay tagging, isomer tagging, and recoil gating techniques, resulting in extensive level schemes for both nuclei. Excitation energies of the isomeric 13/2(+) states have been established and oblate strongly coupled bands built on them have been observed. The nearly spherical 9/2(-) ground-state bands appear to be crossed by more oblate-deformed low-lying structures. The properties of the bands feeding the 1/2(+) intruder states indicate some structural change between Bi-193 and Bi-191. The deformation associated with each of these states has been extracted from total Routhian surface calculations which also reveal the development of prolate minima with decreasing neutron number. B(M1)/B(E2) ratios have been measured for the observed strongly coupled bands in order to resolve the intrinsic excitations. The observed quasiparticle structures in Bi-193 and high-spin isomers both in Bi-193 and Bi-191 are interpreted based on the coupling of the odd proton to the even-even Pb core., QC 20100525

Published
2004
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3. In-beam gamma-ray spectroscopy of Po-190 : First observation of a low-lying prolate band in Po isotopes

Author

Van De Vel, K., Andreyev, A. N., Page, R. D., Kettunen, H., Greenlees, P. T., Jones, P., Julin, R., Juutinen, S., Kankaanpaa, H., Keenan, A., Kuusiniemi, P., Leino, M., Muikku, M., Nieminen, P., Rahkila, P., Uusitalo, J., Eskola, K., Hurstel, A., Huyse, M., Le Coz, Y., Smith, M. B., Van Duppen, P., Wyss, Ramon, Van De Vel, K., Andreyev, A. N., Page, R. D., Kettunen, H., Greenlees, P. T., Jones, P., Julin, R., Juutinen, S., Kankaanpaa, H., Keenan, A., Kuusiniemi, P., Leino, M., Muikku, M., Nieminen, P., Rahkila, P., Uusitalo, J., Eskola, K., Hurstel, A., Huyse, M., Le Coz, Y., Smith, M. B., Van Duppen, P., and Wyss, Ramon

Abstract

Gamma rays from excited states of Po-190 have been observed using I the Jurosphere Ge-detector array coupled to the RITU gas-filled separator. They were associated with a collective band which from spin 4h onwards resembles the prolate rotational bands known in the isotones Pb-188 and Hg-186. This indicates that in Po-190 the prolate configuration becomes yrast above I = 2h. The experimental results are interpreted in a two-band mixing calculation and are in agreement with a-decay data and potential energy surface calculations., QC 20100525

Published
2003
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4. High K bands in mid-supershell nuclei

Author

Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Andreoiu, C, Andreyev, A, Appelbe, D, Bastin, JE, Brew, PMT, Eskola, K, Freeman, SJ, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Ikin, PJC, Jones, PM, Joss, DT, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, RD, Page, T, Pakarinen, J, Reiter, P, Simpson, J, Sletten, G, Theisen, C, Varley, BJ, Wollersheim, HJ, Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Andreoiu, C, Andreyev, A, Appelbe, D, Bastin, JE, Brew, PMT, Eskola, K, Freeman, SJ, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Ikin, PJC, Jones, PM, Joss, DT, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, RD, Page, T, Pakarinen, J, Reiter, P, Simpson, J, Sletten, G, Theisen, C, Varley, BJ, and Wollersheim, HJ

Published
2003

5. High K bands in mid-supershell nuclei

Author

Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Andreoiu, C, Andreyev, A, Appelbe, D, Bastin, JE, Brew, PMT, Eskola, K, Freeman, SJ, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Ikin, PJC, Jones, PM, Joss, DT, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, RD, Page, T, Pakarinen, J, Reiter, P, Simpson, J, Sletten, G, Theisen, C, Varley, BJ, Wollersheim, HJ, Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Andreoiu, C, Andreyev, A, Appelbe, D, Bastin, JE, Brew, PMT, Eskola, K, Freeman, SJ, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Ikin, PJC, Jones, PM, Joss, DT, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, RD, Page, T, Pakarinen, J, Reiter, P, Simpson, J, Sletten, G, Theisen, C, Varley, BJ, and Wollersheim, HJ

Published
2003

6. Conversion electron cascades in 254No102

Author

Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Bastin, JE, Brew, PMT, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, T, Pakarinen, J, Reiter, P, Sletten, G, Theisen, C, Wollersheim, HJ, Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Bastin, JE, Brew, PMT, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, T, Pakarinen, J, Reiter, P, Sletten, G, Theisen, C, and Wollersheim, HJ

Published
2002

7. Conversion electron cascades in 254No102

Author

Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Bastin, JE, Brew, PMT, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, T, Pakarinen, J, Reiter, P, Sletten, G, Theisen, C, Wollersheim, HJ, Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Bastin, JE, Brew, PMT, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, T, Pakarinen, J, Reiter, P, Sletten, G, Theisen, C, and Wollersheim, HJ

Published
2002

8. Conversion electron cascades in 254No102

Author

Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Bastin, JE, Brew, PMT, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, T, Pakarinen, J, Reiter, P, Sletten, G, Theisen, C, Wollersheim, HJ, Butler, PA, Humphreys, RD, Greenlees, PT, Herzberg, RD, Jenkins, DG, Jones, GD, Kankaanpaa, H, Kettunen, H, Rahkila, P, Scholey, C, Uusitalo, J, Amzal, N, Bastin, JE, Brew, PMT, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Helariutta, K, Hessberger, FP, Hurstel, A, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Khoo, TL, Korten, W, Kuusiniemi, P, Le Coz, Y, Leino, M, Leppanen, AP, Muikku, M, Nieminen, P, Odegard, SW, Page, T, Pakarinen, J, Reiter, P, Sletten, G, Theisen, C, and Wollersheim, HJ

Published
2002

9. Identification of excited states in Os-167 and Os-168 : shape coexistence at extreme neutron deficiency

Author

Joss, D. T., King, S. L., Page, R. D., Simpson, J., Keenan, A., Amzal, N., Bäck, Torbjörn, Bentley, M. A., Cederwall, Bo, Cocks, J. F. C., Cullen, D. M., Greenlees, P. T., Helariutta, K., Jones, P. M., Julin, R., Juutinen, S., Kankaanpaa, H., Kettunen, H., Kuusiniemi, P., Leino, M., Muikku, M., Savelius, A., Uusitalo, J., Williams, S. J., Joss, D. T., King, S. L., Page, R. D., Simpson, J., Keenan, A., Amzal, N., Bäck, Torbjörn, Bentley, M. A., Cederwall, Bo, Cocks, J. F. C., Cullen, D. M., Greenlees, P. T., Helariutta, K., Jones, P. M., Julin, R., Juutinen, S., Kankaanpaa, H., Kettunen, H., Kuusiniemi, P., Leino, M., Muikku, M., Savelius, A., Uusitalo, J., and Williams, S. J.

Abstract

Excited states in the very neutron-deficient isotopes Os-167 and Os-168 have been observed using the reaction Sn-112(Ni-58, 2pxn). The JUROSPHERE gamma -ray spectrometer array was used in conjunction with the RITU gas-filled recoil separator to collect prompt gamma radiation in coincidence with recoils implanted in a silicon strip detector located at the focal plane of RITU. Using a selective recoil decay tagging technique it has been possible to unambiguously assign gamma -ray transitions to Os-167 and Os-168 through the characteristic a radioactivity of these nuclides. The high-spin structure of the bands is discussed in terms of quasiparticle configurations within the framework of the cranked shell model. The role of shape coexistence in Os-168 is examined with phenomenological three-band mixing calculations., QC 20100525

Published
2001
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10. The structure of heavy octupole and superheavy quadrupole deformed nuclei

Author

Amzal, N, Butler, PA, Greenlees, PT, Herzberg, RD, Humphreys, RD, Kankaanpaa, H, Bastin, J, Becker, F, Brew, PM, Cocks, JFC, Cunningham, RA, Czosnyka, T, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Heikinen, P, Helariutta, K, Hessberger, FP, Hurstel, A, Iwanicki, I, Jones, GD, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Kettunen, H, Khlebnikov, S, Khoo, TL, Korten, W, Kuusiniemi, P, LeCoz, Y, Leino, M, Muikku, M, Nieminen, P, Page, T, Rahkila, P, Reiter, P, Scholey, CS, Sletten, G, Stezowski, O, Theisen, C, Uusitalo, J, Wollersheim, HJ, Amzal, N, Butler, PA, Greenlees, PT, Herzberg, RD, Humphreys, RD, Kankaanpaa, H, Bastin, J, Becker, F, Brew, PM, Cocks, JFC, Cunningham, RA, Czosnyka, T, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Heikinen, P, Helariutta, K, Hessberger, FP, Hurstel, A, Iwanicki, I, Jones, GD, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Kettunen, H, Khlebnikov, S, Khoo, TL, Korten, W, Kuusiniemi, P, LeCoz, Y, Leino, M, Muikku, M, Nieminen, P, Page, T, Rahkila, P, Reiter, P, Scholey, CS, Sletten, G, Stezowski, O, Theisen, C, Uusitalo, J, and Wollersheim, HJ

Published
2001

11. The structure of heavy octupole and superheavy quadrupole deformed nuclei

Author

Amzal, N, Butler, PA, Greenlees, PT, Herzberg, RD, Humphreys, RD, Kankaanpaa, H, Bastin, J, Becker, F, Brew, PM, Cocks, JFC, Cunningham, RA, Czosnyka, T, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Heikinen, P, Helariutta, K, Hessberger, FP, Hurstel, A, Iwanicki, I, Jones, GD, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Kettunen, H, Khlebnikov, S, Khoo, TL, Korten, W, Kuusiniemi, P, LeCoz, Y, Leino, M, Muikku, M, Nieminen, P, Page, T, Rahkila, P, Reiter, P, Scholey, CS, Sletten, G, Stezowski, O, Theisen, C, Uusitalo, J, Wollersheim, HJ, Amzal, N, Butler, PA, Greenlees, PT, Herzberg, RD, Humphreys, RD, Kankaanpaa, H, Bastin, J, Becker, F, Brew, PM, Cocks, JFC, Cunningham, RA, Czosnyka, T, Eskola, K, Gerl, J, Hammond, NJ, Hauschild, K, Heikinen, P, Helariutta, K, Hessberger, FP, Hurstel, A, Iwanicki, I, Jones, GD, Jones, PM, Julin, R, Juutinen, S, Keenan, A, Kettunen, H, Khlebnikov, S, Khoo, TL, Korten, W, Kuusiniemi, P, LeCoz, Y, Leino, M, Muikku, M, Nieminen, P, Page, T, Rahkila, P, Reiter, P, Scholey, CS, Sletten, G, Stezowski, O, Theisen, C, Uusitalo, J, and Wollersheim, HJ

Published
2001

12. Microsecond isomers in 187 Tl and 188 Pb

Author

Byrne, Aidan, Baxter, Allan, Dracoulis, George, Mullins, Simon, Kibedi, Tibor, McGoram, T., Helariutta, K, Cocks, J F C, Jones, Peter G, Julin, Rauno Juhani, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Nieminen, Paivi H, Rahkila, P, Savelius, A, Byrne, Aidan, Baxter, Allan, Dracoulis, George, Mullins, Simon, Kibedi, Tibor, McGoram, T., Helariutta, K, Cocks, J F C, Jones, Peter G, Julin, Rauno Juhani, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Nieminen, Paivi H, Rahkila, P, and Savelius, A

Published
2000

13. Bandcrossings in Os-171

Author

Bark, R A, Tormanen, S, Bäck, Torbjörn, Cederwall, Bo, Odegard, S W, Cocks, J F C, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Bark, R A, Tormanen, S, Bäck, Torbjörn, Cederwall, Bo, Odegard, S W, Cocks, J F C, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, and Savelius, A

Abstract

The nucleus Os-171 has been populated using the reaction Sn-116(Ni-58,2pn). Four new bands are identified, and the previously known bands are extended in spin, to a maximum of 53/2 (h) over bar. One- and three-quasiparticle configurations are identified, and beta, gamma, and octupole configurations are assigned tentatively. The effects of a possible intruder configuration on the negative parity bands are tested using band-mixing calculations., NR 20160115

Published
1999
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14. Coexistence of triaxial and prolate shapes in Ir-171

Author

Bark, R A, Tormanen, S, Bäck, Torbjörn, Cederwall, Bo, Odegard, S W, Cocks, J F C, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Bergstrom, M, Ingebretsen, F, Maj, A, Mattiuzzi, M, Mueller, W, Riedinger, L L, Saitoh, T, Tjom, P O, Bark, R A, Tormanen, S, Bäck, Torbjörn, Cederwall, Bo, Odegard, S W, Cocks, J F C, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Bergstrom, M, Ingebretsen, F, Maj, A, Mattiuzzi, M, Mueller, W, Riedinger, L L, Saitoh, T, and Tjom, P O

Abstract

Excited states in Ir-171 have been observed for the first time. Gamma-rays were assigned to the nucleus by the recoil-decay tagging method, The ground-state band has a structure consistent with an h(11/2) proton coupled to a core of large triaxial deformation. At high spins, a bandcrossing occurs which is interpreted as a change in shape to a prolate deformation, Band-mixing calculations are performed for Ir171-175. These show that shape-coexistence between triaxial and prolate states in these nuclei follows the same systematics found in their Pt and Os neighbours. The systematics are also compared with deformations calculated for Ir171-179 using the code "Ultimate Cranker". Dipole bands were also observed, but tilted axis cranking calculations suggest that they are associated with a collective rotation., NV 20160114

Published
1999
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15. Coexistence of triaxial and prolate shapes in 171Ir

Author

Bark, R A, Tormanen, S, Back, T., Cederwall, B., Odegard, S W, Cocks, J F C, Helariutta, K, Jones, Peter G, Julin, Rauno Juhani, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuwano, Michihiko, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Bergstrom, M, Ingebretsen, F, Maj, A, Mattiuzzi, M, Muller, W J, Riedinger, L L, Tjom, P O, Bark, R A, Tormanen, S, Back, T., Cederwall, B., Odegard, S W, Cocks, J F C, Helariutta, K, Jones, Peter G, Julin, Rauno Juhani, Juutinen, S, Kankaanpaa, H, Kettunen, H, Kuwano, Michihiko, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Bergstrom, M, Ingebretsen, F, Maj, A, Mattiuzzi, M, Muller, W J, Riedinger, L L, and Tjom, P O

Abstract

Excited states in 171Ir have been observed for the first time. Gamma-rays were assigned to the nucleus by the recoil-decay tagging method. The ground-state band has a structure consistent with an h11/2 proton coupled to a core of large triaxial deformation. At high spins, a bandcrossing occurs which is interpreted as a change in shape to a prolate deformation. Band-mixing calculations are performed for 171-175Ir. These show that shape-coexistence between triaxial and prolate states in these nuclei follows the same systematics found in their Pt and Os neighbours. The systematics are also compared with deformations calculated for 171-179Ir using the code "Ultimate Cranker". Dipole bands were also observed, but tilted axis cranking calculations suggest that they are associated with a collective rotation.

Published
1999

16. Search for Hyperdeformation in U Isotopes

Author

Hawcroft, D., Herzberg, R., Appelbe, D., Butler, P. A., Chewter, A. J. C., Jones, G. D., Rea, D., Aschman, D., Babu, B., Bark, R. A., Beetge, R., Benatar, M., Dracoulis, George, Fearick, R., Fortsch, S., Juutinen, S., Kankaanpaa, H., Lawrie, K., Mabala, G., Mhlahlo, N., Murray, S., Naguleswaran, S., Rigollet, C., Scharpey-Schafer, J., Simpson, B., Smit, R., Whittaker, W., Tshivhase, V., Hawcroft, D., Herzberg, R., Appelbe, D., Butler, P. A., Chewter, A. J. C., Jones, G. D., Rea, D., Aschman, D., Babu, B., Bark, R. A., Beetge, R., Benatar, M., Dracoulis, George, Fearick, R., Fortsch, S., Juutinen, S., Kankaanpaa, H., Lawrie, K., Mabala, G., Mhlahlo, N., Murray, S., Naguleswaran, S., Rigollet, C., Scharpey-Schafer, J., Simpson, B., Smit, R., Whittaker, W., and Tshivhase, V.

Abstract

The 232U nucleus was studied in order to search for a hyperdeformed band built upon the third minimum of the fission barrier. Upper limits for the percentage population of a hypothetical hyperdeformed band relative to the ground state band are given.

Published
1999

17. First observation of excited states in the neutron deficient nuclei (PT)-P-168 and Pt-170

Author

King, S L, Simpson, J, Page, R D, Amzal, N, Bäck, Torbjörn, Cederwall, Bo, Cocks, J F C, Cullen, D M, Greenlees, P T, Harder, M K, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpaa, H, Keenan, A, Kettunen, H, Kuusiniemi, P, Leino, M, Lemmon, R, Muikku, M, Savelius, A, Uusitalo, J, Van Isacker, P, King, S L, Simpson, J, Page, R D, Amzal, N, Bäck, Torbjörn, Cederwall, Bo, Cocks, J F C, Cullen, D M, Greenlees, P T, Harder, M K, Helariutta, K, Jones, P, Julin, R, Juutinen, S, Kankaanpaa, H, Keenan, A, Kettunen, H, Kuusiniemi, P, Leino, M, Lemmon, R, Muikku, M, Savelius, A, Uusitalo, J, and Van Isacker, P

Abstract

Excited states have been observed for the first time in (XPt)-X-168 and Pt-170 using the alpha-decay recoil-tagging technique. The trend of decreasing deformation moving away from the N = 104 mid-shell continues far Pt-170 but the structure of Pt-168 is significantly different. The low spin level energy systematics in Pt168-184 are presented and discussed within the framework of the interacting boson model. (C) 1998 Elsevier Science B.V. All rights reserved., NR 20160114

Published
1998
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18. Collective rotational-vibrational transition in the very neutron-deficient nuclei (171,172)-Pt

Author

Cederwall, Bo, Bäck, Torbjörn, Bark, R, Tormanen, S, Odegard, S, King, L, Simpson, J, Page, D, Amzal, N, Cullen, M, Greenlees, T, Keenan, A, Lemmon, R, Cocks, C, Helariutta, K, Jones, M, Julin, R, Juutinen, S, Kettunen, H, Kankaanpaa, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Uusitalo, J, Magierski, P, Wyss, Ramon, Cederwall, Bo, Bäck, Torbjörn, Bark, R, Tormanen, S, Odegard, S, King, L, Simpson, J, Page, D, Amzal, N, Cullen, M, Greenlees, T, Keenan, A, Lemmon, R, Cocks, C, Helariutta, K, Jones, M, Julin, R, Juutinen, S, Kettunen, H, Kankaanpaa, H, Kuusiniemi, P, Leino, M, Muikku, M, Rahkila, P, Savelius, A, Uusitalo, J, Magierski, P, and Wyss, Ramon

Abstract

Excited states have been identified for the first time in very neutron deficient Pt-171.172 nuclei using the recoil-or-decay tagging technique. The ground-state band in Pt-172 has been established up to I-pi = 8+. A similar level sequence, presumably built on the I-pi = 13/2(+) state, is observed for Pt-171. The data are compared with theoretical calculations based on the mean field approach and the random phase approximation and are put into the context of the systematics of platinum isotopes. (C) 1998 Elsevier Science B.V. All rights reserved., QC 20100521

Published
1998
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19. Determination of recent sedimentation in the Gulf of Finland using Cs-137

Author

Kankaanpaa, H, Vallius, H, Sandman, O, Niemisto, L, Kankaanpaa, H, Vallius, H, Sandman, O, and Niemisto, L

Abstract

Linear accumulation rates and dry-matter accumulation rates were determined using Cs-137 distribution in sediment cores from 98 coastal and open-sea stations from around the Gulf of Finland (the Baltic Sea). Results showed that the average linear accumulation rate varied between 0.05-1.94 (mean 0.60) cm a(-1) which corresponds to a dry-matter accumulation rate of 0.01-0.30 (mean 0.15) g cm(-2) a(-1). Accumulation rates were high in recent mud sediments, especially near river outlets. The highest rates were found at inshore stations near Kotka town. Peak Cs-137 activities in cores from the whole study area varied between 0.04-2.4 Bq g(-1) wet weight. The highest activities were found in areas most affected by fallout from the 1986 Chernobyl accident, and corresponded to the overall areal distribution of Cs-137 in the soil but the areal distribution of Cs-137 in the sediments was also caused by the discharge of sedimenting particulate material from land. Total Chernobyl fallout in the area was between 1.4-80.5 (mean 21) kBq m(-2). Mixing of sediment strata was considerable in the uppermost sediment layers of many soft sediments, as indicated by the width of the Cs-137 peak in the cores. The Cs-137 technique can be used successfully in the Gulf of Finland because of high radiocaesium activities and the high accumulation rates. With the data obtained, the suitability of the stations for chronological sampling and monitoring was evaluated, and several new sediment stations that could be used for monitoring were identified.

Published
1997

20. Determination of recent sedimentation in the Gulf of Finland using Cs-137

Author

Kankaanpaa, H, Vallius, H, Sandman, O, Niemisto, L, Kankaanpaa, H, Vallius, H, Sandman, O, and Niemisto, L

Abstract

Linear accumulation rates and dry-matter accumulation rates were determined using Cs-137 distribution in sediment cores from 98 coastal and open-sea stations from around the Gulf of Finland (the Baltic Sea). Results showed that the average linear accumulation rate varied between 0.05-1.94 (mean 0.60) cm a(-1) which corresponds to a dry-matter accumulation rate of 0.01-0.30 (mean 0.15) g cm(-2) a(-1). Accumulation rates were high in recent mud sediments, especially near river outlets. The highest rates were found at inshore stations near Kotka town. Peak Cs-137 activities in cores from the whole study area varied between 0.04-2.4 Bq g(-1) wet weight. The highest activities were found in areas most affected by fallout from the 1986 Chernobyl accident, and corresponded to the overall areal distribution of Cs-137 in the soil but the areal distribution of Cs-137 in the sediments was also caused by the discharge of sedimenting particulate material from land. Total Chernobyl fallout in the area was between 1.4-80.5 (mean 21) kBq m(-2). Mixing of sediment strata was considerable in the uppermost sediment layers of many soft sediments, as indicated by the width of the Cs-137 peak in the cores. The Cs-137 technique can be used successfully in the Gulf of Finland because of high radiocaesium activities and the high accumulation rates. With the data obtained, the suitability of the stations for chronological sampling and monitoring was evaluated, and several new sediment stations that could be used for monitoring were identified.

Published
1997

21. Determination of recent sedimentation in the Gulf of Finland using Cs-137

Author

Kankaanpaa, H, Vallius, H, Sandman, O, Niemisto, L, Kankaanpaa, H, Vallius, H, Sandman, O, and Niemisto, L

Abstract

Linear accumulation rates and dry-matter accumulation rates were determined using Cs-137 distribution in sediment cores from 98 coastal and open-sea stations from around the Gulf of Finland (the Baltic Sea). Results showed that the average linear accumulation rate varied between 0.05-1.94 (mean 0.60) cm a(-1) which corresponds to a dry-matter accumulation rate of 0.01-0.30 (mean 0.15) g cm(-2) a(-1). Accumulation rates were high in recent mud sediments, especially near river outlets. The highest rates were found at inshore stations near Kotka town. Peak Cs-137 activities in cores from the whole study area varied between 0.04-2.4 Bq g(-1) wet weight. The highest activities were found in areas most affected by fallout from the 1986 Chernobyl accident, and corresponded to the overall areal distribution of Cs-137 in the soil but the areal distribution of Cs-137 in the sediments was also caused by the discharge of sedimenting particulate material from land. Total Chernobyl fallout in the area was between 1.4-80.5 (mean 21) kBq m(-2). Mixing of sediment strata was considerable in the uppermost sediment layers of many soft sediments, as indicated by the width of the Cs-137 peak in the cores. The Cs-137 technique can be used successfully in the Gulf of Finland because of high radiocaesium activities and the high accumulation rates. With the data obtained, the suitability of the stations for chronological sampling and monitoring was evaluated, and several new sediment stations that could be used for monitoring were identified.

Published
1997

22. Determination of recent sedimentation in the Gulf of Finland using Cs-137

Author

Kankaanpaa, H, Vallius, H, Sandman, O, Niemisto, L, Kankaanpaa, H, Vallius, H, Sandman, O, and Niemisto, L

Abstract

Linear accumulation rates and dry-matter accumulation rates were determined using Cs-137 distribution in sediment cores from 98 coastal and open-sea stations from around the Gulf of Finland (the Baltic Sea). Results showed that the average linear accumulation rate varied between 0.05-1.94 (mean 0.60) cm a(-1) which corresponds to a dry-matter accumulation rate of 0.01-0.30 (mean 0.15) g cm(-2) a(-1). Accumulation rates were high in recent mud sediments, especially near river outlets. The highest rates were found at inshore stations near Kotka town. Peak Cs-137 activities in cores from the whole study area varied between 0.04-2.4 Bq g(-1) wet weight. The highest activities were found in areas most affected by fallout from the 1986 Chernobyl accident, and corresponded to the overall areal distribution of Cs-137 in the soil but the areal distribution of Cs-137 in the sediments was also caused by the discharge of sedimenting particulate material from land. Total Chernobyl fallout in the area was between 1.4-80.5 (mean 21) kBq m(-2). Mixing of sediment strata was considerable in the uppermost sediment layers of many soft sediments, as indicated by the width of the Cs-137 peak in the cores. The Cs-137 technique can be used successfully in the Gulf of Finland because of high radiocaesium activities and the high accumulation rates. With the data obtained, the suitability of the stations for chronological sampling and monitoring was evaluated, and several new sediment stations that could be used for monitoring were identified.

Published
1997

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