Search

Your search keyword '"Vaska, P."' showing total 10 results
Start Over Author "Vaska, P." Publication Type Electronic Resources
10 results on '"Vaska, P."'

1. Magnetic and intruder rotational bands in In-113

Author

Naguleswaran, S., Chakrawarthy, R. S., Garg, U., Lamkin, K. L., Smith, G., Walpe, J. C., Galindo-Uribarri, A., Janzen, V. P., Radford, D. C., Kaczarowski, R., Fossan, D. B., Lafosse, D. R., Vaska, P., Droste, C., Morek, T., Pilotte, S., DeGraaf, J., Drake, T., Wyss, Ramon, Naguleswaran, S., Chakrawarthy, R. S., Garg, U., Lamkin, K. L., Smith, G., Walpe, J. C., Galindo-Uribarri, A., Janzen, V. P., Radford, D. C., Kaczarowski, R., Fossan, D. B., Lafosse, D. R., Vaska, P., Droste, C., Morek, T., Pilotte, S., DeGraaf, J., Drake, T., and Wyss, Ramon

Abstract

Excited states in In-113 were populated via the reactions Mo-100(O-18,p4n)In-113 and Pd-110(Li-7,4n)In-113. The two known Delta J=2 intruder bands, based on the pi g(7/2)circle times d(5/2) and pi h(11/2) orbitals, have been extended by 8h to spins (49/2(+))h and (55/2(-))h, respectively. The previous finding of three sequences of Delta J=1 gamma-ray transitions has been confirmed. A self-consistent cranked shell-model calculation gives a good description of the contrasting alignment patterns of the two Delta J=2 intruder bands. The intruder bands, the known sequences of M1 transitions, and spherical levels together represent a coexistence of three different excitation modes in this nucleus., QC 20100525

Published
2005
Full Text
View/download PDF

2. Spectroscopy in the Z=49 108,110In isotopes: Lifetime measurements inshears bands

Author

Chiara, C. J., Fossan, D. B., Janzen, V. P., Koike, T., Lafosse, D. R., Lane, G. J., Mullins, S. M., Paul, E. S., Radford, D. C., Schnare, H., Sears, J. M., Smith, J. F., Starosta, K., Vaska, P., Wadsworth, R., Ward, D., Frauendorf, S., Chiara, C. J., Fossan, D. B., Janzen, V. P., Koike, T., Lafosse, D. R., Lane, G. J., Mullins, S. M., Paul, E. S., Radford, D. C., Schnare, H., Sears, J. M., Smith, J. F., Starosta, K., Vaska, P., Wadsworth, R., Ward, D., and Frauendorf, S.

Abstract

Excited states have been populated in In-108 and In-110 in complementary backed- and thin-target experiments, using the Stony Brook and the 8 pi Ge-detector arrays. The level schemes for both isotopes have been extended and modified, including the first observation of DeltaI = 2 bands in In-110. Lifetimes of states in four DeltaI = 1 bands and one DeltaI = 2 band have been measured using the Doppler-shift attenuation method. Experimental total angular momenta and reduced transition strengths for the DeltaI = 1 bands have been compared with tilted axis cranking predictions for shears bands with configurations involving one proton g(9/2) hole and one or three valence quasineutrons from the h(11/2) and g(7/2)/d(5/2) orbitals. The DeltaI = 2 bands have been compared with principal axis cranking predictions for configurations with two g(9/2) proton holes and a g(7/2) or d(5/2) proton and one- or three-quasineutron configurations involving the h(11/2) and g(7/2)/d(5/2) orbitals. In general, there is good overall agreement for both the angular momenta and reduced transition strengths. The DeltaI = 1 and DeltaI = 2 bands have large J((2))/B (E2) ratios as expected for the shears mechanism. The B (M1) strengths deduced for the DeltaI = 1 bands show a decreasing trend as a function of spin, which is also a feature of the shears mechanism. Configuration assignments have been made for most observed bands based on comparisons with theory and systematics of neighboring nuclei.

Published
2001

3. Particle-hole induced electric and magnetic rotaqtion in 111In

Author

Vaska, P., Fossan, D. B., Lafosse, D. R., Schnare, H., Waring, M. P., Mullins, S. M., Hackman, G., Prevost, D., Waddington, J. C., Janzen, V. P., Ward, D., Wadsworth, R., Paul, E. S., Vaska, P., Fossan, D. B., Lafosse, D. R., Schnare, H., Waring, M. P., Mullins, S. M., Hackman, G., Prevost, D., Waddington, J. C., Janzen, V. P., Ward, D., Wadsworth, R., and Paul, E. S.

Published
1998

4. High-spin states, particle-hole structure, and linked smooth terminating bands in doubly odd 112Sb

Author

Lane, G. J., Fossan, D. B., Chiara, C. J., Schnare, H., Sears, J. M., Smith, J. F., Thorslund, I., Vaska, P., Paul, E. S., Wilson, A. N., Wilson, J. N., Hauschild, K., Hibbert, I. M., Wadsworth, R., Afanasjev, A. V., Ragnarsson, I., Lane, G. J., Fossan, D. B., Chiara, C. J., Schnare, H., Sears, J. M., Smith, J. F., Thorslund, I., Vaska, P., Paul, E. S., Wilson, A. N., Wilson, J. N., Hauschild, K., Hibbert, I. M., Wadsworth, R., Afanasjev, A. V., and Ragnarsson, I.

Published
1998

5. Particle-hole Induced Intruder Bands in117Sb and 119Sb

Author

Lafosse, D. R., Fossan, D. B., Hughes, J. R., Liang, Y., Schnare, H., Vaska, P., Waring, M. P., Zhang, J. Y., Lafosse, D. R., Fossan, D. B., Hughes, J. R., Liang, Y., Schnare, H., Vaska, P., Waring, M. P., and Zhang, J. Y.

Published
1997

6. Identification of Excited States in Doubly Odd 110Sb: Smooth Band Termination

Author

Lane, G. J., Fossan, D. B., Thorslund, I., Vaska, P., Allatt, R. G., Paul, E. S., Käubler, L., Schnare, H., Hibbert, I. M., O'Brien, N., Wadsworth, R., Andrejtscheff, W., Graaf, J., Simpson, J., Lee, I. Y., Macchiavelli, A. O., Blumenthal, D. J., Davids, C. N., Lister, C. J., Seweryniak, D., Afanasjev, A. V., Ragnarsson, I., Lane, G. J., Fossan, D. B., Thorslund, I., Vaska, P., Allatt, R. G., Paul, E. S., Käubler, L., Schnare, H., Hibbert, I. M., O'Brien, N., Wadsworth, R., Andrejtscheff, W., Graaf, J., Simpson, J., Lee, I. Y., Macchiavelli, A. O., Blumenthal, D. J., Davids, C. N., Lister, C. J., Seweryniak, D., Afanasjev, A. V., and Ragnarsson, I.

Abstract

Excited states in 110Sb have been identified for the first time in a series of gamma-spectroscopy experiments using both thin and backed targets, including neutron-fold and recoil-mass measurements to provide unambiguous channel identification. The three decoupled intruder bands observed in 110Sb are based upon configurations involving 2p-2h excitations across the Z=50 shell gap and show the features of smooth band termination. The yrast intruder band, which has been connected to the low-spin levels, is tentatively identified up to its predicted termination at IPi=45+. Excellent agreement with configuration-dependent cranked Nilsson-Strutinsky calculations is obtained for the high-spin states near termination.

Published
1997

7. Collective structures and smooth band termination in 109Sn

Author

Käubler, L., Schnare, H., Fossan, D. B., Afanasjev, A. V., Andrejtscheff, W., Allatt, R. G., Graaf, J., Grawe, H., Hibbert, I. M., Lee, I. Y., Macchiavelli, A. D., O'Brien, N., Maier, K. H., Paul, E. S., Prade, H., Ragnarsson, I., Reif, J., Schubart, R., Thorslund, I., Vaska, P., Wadsworth, R., Winter, G., Käubler, L., Schnare, H., Fossan, D. B., Afanasjev, A. V., Andrejtscheff, W., Allatt, R. G., Graaf, J., Grawe, H., Hibbert, I. M., Lee, I. Y., Macchiavelli, A. D., O'Brien, N., Maier, K. H., Paul, E. S., Prade, H., Ragnarsson, I., Reif, J., Schubart, R., Thorslund, I., Vaska, P., Wadsworth, R., and Winter, G.

Abstract

Six rotational bands up to energies Ex=24.7 MeV and spins Jpi=(79/2-) have been identified in 109Sn using the GAMMASPHERE gamma-detector array. Four of the bands show smoothly decreasing dynamic moments of inertia at rotational frequencies hv > 0.6 MeV. The bands arise at medium spins from coupling of a valence d5/2, g7/2 or h11/2 neutron to the deformed 2p2h proton excitation of the Z=50 core 108Sn. At very high hv these bands show the typical behaviour of smoothly terminating bands, i.e. a gradual alignment of the angular momenta of the valence particles and holes corresponding to a transition from high collectivity to noncollective states.

Published
1996

8. Intruder bands in 114Te: Smooth band termination

Author

Thorslund, I., Fossan, D. B., Lafosse, D. R., Schnare, H., Hauschild, K., Hibbert, I. M., Mullins, S. M., Paul, E. S., Ragnarsson, I., Sears, J. M., Vaska, P., Wadsworth, R., Thorslund, I., Fossan, D. B., Lafosse, D. R., Schnare, H., Hauschild, K., Hibbert, I. M., Mullins, S. M., Paul, E. S., Ragnarsson, I., Sears, J. M., Vaska, P., and Wadsworth, R.

Published
1995

9. Oblate bands in A approximately 200 bismuth nuclei

Author

Dagnall, P.J., Beausang, C.W., Clark, R.M., Wadsworth, R., Bhattacharjee, S., Fallon, P., Forsyth, P.D., Fossan, D.B., Defrance, G., Gale, S.J., Hannachi, F., Hauschild, K., Hibbert, I.M., Hubel, H., Jones, P.M., Joyce, M.J., Korichi, A., Korten, W., Lafosse, D.R., Paul, E.S., Schnare, H., Starosta, K., Sharpey-Schafer, J.F., Twin, P.J., Vaska, P., Waring, M.P., Wilson, J.N., Dagnall, P.J., Beausang, C.W., Clark, R.M., Wadsworth, R., Bhattacharjee, S., Fallon, P., Forsyth, P.D., Fossan, D.B., Defrance, G., Gale, S.J., Hannachi, F., Hauschild, K., Hibbert, I.M., Hubel, H., Jones, P.M., Joyce, M.J., Korichi, A., Korten, W., Lafosse, D.R., Paul, E.S., Schnare, H., Starosta, K., Sharpey-Schafer, J.F., Twin, P.J., Vaska, P., Waring, M.P., and Wilson, J.N.

Abstract

The nuclei 198-200Bi were populated via the 186W(19F,xn)198-200Bi reaction at beam energies of 115 MeV and 105 MeV. Another experiment, aimed at investigating the high-spin-level structure of 203,204Bi, used the 198Pt(11B,xn) reaction at a beam energy of 74 MeV. Five new Delta I=1 rotational structures, consisting of stretched magnetic dipole transitions, have been observed. One of these bands is assigned to 198Bi, one to 199Bi, two to 200Bi, and one to 203Bi. The behaviour of the dynamic moments of inertia of these oblate bands is compared with other bands in neighbouring Pb and Bi nuclei.

Published
1994

10. Oblate bands in A approximately 200 bismuth nuclei

Author

Dagnall, P.J., Beausang, C.W., Clark, R.M., Wadsworth, R., Bhattacharjee, S., Fallon, P., Forsyth, P.D., Fossan, D.B., Defrance, G., Gale, S.J., Hannachi, F., Hauschild, K., Hibbert, I.M., Hubel, H., Jones, P.M., Joyce, M.J., Korichi, A., Korten, W., Lafosse, D.R., Paul, E.S., Schnare, H., Starosta, K., Sharpey-Schafer, J.F., Twin, P.J., Vaska, P., Waring, M.P., Wilson, J.N., Dagnall, P.J., Beausang, C.W., Clark, R.M., Wadsworth, R., Bhattacharjee, S., Fallon, P., Forsyth, P.D., Fossan, D.B., Defrance, G., Gale, S.J., Hannachi, F., Hauschild, K., Hibbert, I.M., Hubel, H., Jones, P.M., Joyce, M.J., Korichi, A., Korten, W., Lafosse, D.R., Paul, E.S., Schnare, H., Starosta, K., Sharpey-Schafer, J.F., Twin, P.J., Vaska, P., Waring, M.P., and Wilson, J.N.

Abstract

The nuclei 198-200Bi were populated via the 186W(19F,xn)198-200Bi reaction at beam energies of 115 MeV and 105 MeV. Another experiment, aimed at investigating the high-spin-level structure of 203,204Bi, used the 198Pt(11B,xn) reaction at a beam energy of 74 MeV. Five new Delta I=1 rotational structures, consisting of stretched magnetic dipole transitions, have been observed. One of these bands is assigned to 198Bi, one to 199Bi, two to 200Bi, and one to 203Bi. The behaviour of the dynamic moments of inertia of these oblate bands is compared with other bands in neighbouring Pb and Bi nuclei.

Published
1994

Catalog

Books, media, physical & digital resources
See catalog results