Abstract
In in-beam experiments using the {gamma}-spectrometers Nordball and Osiris, we populated the four N = 84 isotones {sup 151}Ho, {sup 152}Er, {sup 153}Tm and {sup 154}Yb through compound evaporation reactions induced with medium HI beams of masses ranging from 28 to 56. All observed {gamma}-transitions with intensities above 1% (5% in {sup 154}Yb) of the respective exit channel were placed in the level schemes, with spins established up to 10 MeV (8 MeV for {sup 154}Yb) and parties up to between 5 and 7 MeV. We have found that in these N = 84 nuclei the multi-valence particle configurations {pi}h{sup n}{sub 11/2}{nu}f{sup 2}{sub 7/2} and {pi}h{sup n}{sub 11/2}{nu}f{sub 7/2}h{sub 9/2} are strongly populated in the yrast cascades, and we have observed them up to their maximum spins of 43/2{sup -} in Ho (at 4.8 MeV), 24{sup +} in Er (7.5 MeV), 51/2{sup -} in Tm (6.9 MeV), and only up to 24{sup +} in Yb, 0.5 MeV below the fully aligned 26{sup +} state expected at 9.1 MeV. The {pi}h{sup n}{nu}f{sup 2} configuration forms smooth sections of the yrast line, while the more irregular yrast line of the {pi}h{sup n}{nu}fh character reflects the strong ({nu}fh)8{sup +} two-body attraction which gives
More>>
Citation Formats
Chengteng, Zhang.
In-beam {gamma}-ray spectroscopy of N=84 nuclei above Gd and the impact of the ({pi}h{sub 11/2}{nu}h{sub 9/2})1{sup +} attraction on their yrast lines.
Germany: N. p.,
1993.
Web.
Chengteng, Zhang.
In-beam {gamma}-ray spectroscopy of N=84 nuclei above Gd and the impact of the ({pi}h{sub 11/2}{nu}h{sub 9/2})1{sup +} attraction on their yrast lines.
Germany.
Chengteng, Zhang.
1993.
"In-beam {gamma}-ray spectroscopy of N=84 nuclei above Gd and the impact of the ({pi}h{sub 11/2}{nu}h{sub 9/2})1{sup +} attraction on their yrast lines."
Germany.
@misc{etde_10154156,
title = {In-beam {gamma}-ray spectroscopy of N=84 nuclei above Gd and the impact of the ({pi}h{sub 11/2}{nu}h{sub 9/2})1{sup +} attraction on their yrast lines}
author = {Chengteng, Zhang}
abstractNote = {In in-beam experiments using the {gamma}-spectrometers Nordball and Osiris, we populated the four N = 84 isotones {sup 151}Ho, {sup 152}Er, {sup 153}Tm and {sup 154}Yb through compound evaporation reactions induced with medium HI beams of masses ranging from 28 to 56. All observed {gamma}-transitions with intensities above 1% (5% in {sup 154}Yb) of the respective exit channel were placed in the level schemes, with spins established up to 10 MeV (8 MeV for {sup 154}Yb) and parties up to between 5 and 7 MeV. We have found that in these N = 84 nuclei the multi-valence particle configurations {pi}h{sup n}{sub 11/2}{nu}f{sup 2}{sub 7/2} and {pi}h{sup n}{sub 11/2}{nu}f{sub 7/2}h{sub 9/2} are strongly populated in the yrast cascades, and we have observed them up to their maximum spins of 43/2{sup -} in Ho (at 4.8 MeV), 24{sup +} in Er (7.5 MeV), 51/2{sup -} in Tm (6.9 MeV), and only up to 24{sup +} in Yb, 0.5 MeV below the fully aligned 26{sup +} state expected at 9.1 MeV. The {pi}h{sup n}{nu}f{sup 2} configuration forms smooth sections of the yrast line, while the more irregular yrast line of the {pi}h{sup n}{nu}fh character reflects the strong ({nu}fh)8{sup +} two-body attraction which gives rise to pronounced yrast line dips. We have also carried out full shell model calculations of these yrast lines, which are in excellent agreement with the experimental data. Since we take all dynamic input values, i.e. the two-body matrix elements and the single particle energies, from experiment, the calculations are free of any adjusted parameter. An interesting new result is the systematic identification in the {pi}h{sup n}{sub 11/2}{nu}fh configuration of yrast states formed by specific proton couplings, where the strongly attractive ({pi}h{sub 11/2}{nu}h{sub 9/2})1{sup +} interaction is activated. As a consequence these states drop down to the yrast lines and in energy below the maximum aligned state of the next lower proton seniority.}
place = {Germany}
year = {1993}
month = {Dec}
}
title = {In-beam {gamma}-ray spectroscopy of N=84 nuclei above Gd and the impact of the ({pi}h{sub 11/2}{nu}h{sub 9/2})1{sup +} attraction on their yrast lines}
author = {Chengteng, Zhang}
abstractNote = {In in-beam experiments using the {gamma}-spectrometers Nordball and Osiris, we populated the four N = 84 isotones {sup 151}Ho, {sup 152}Er, {sup 153}Tm and {sup 154}Yb through compound evaporation reactions induced with medium HI beams of masses ranging from 28 to 56. All observed {gamma}-transitions with intensities above 1% (5% in {sup 154}Yb) of the respective exit channel were placed in the level schemes, with spins established up to 10 MeV (8 MeV for {sup 154}Yb) and parties up to between 5 and 7 MeV. We have found that in these N = 84 nuclei the multi-valence particle configurations {pi}h{sup n}{sub 11/2}{nu}f{sup 2}{sub 7/2} and {pi}h{sup n}{sub 11/2}{nu}f{sub 7/2}h{sub 9/2} are strongly populated in the yrast cascades, and we have observed them up to their maximum spins of 43/2{sup -} in Ho (at 4.8 MeV), 24{sup +} in Er (7.5 MeV), 51/2{sup -} in Tm (6.9 MeV), and only up to 24{sup +} in Yb, 0.5 MeV below the fully aligned 26{sup +} state expected at 9.1 MeV. The {pi}h{sup n}{nu}f{sup 2} configuration forms smooth sections of the yrast line, while the more irregular yrast line of the {pi}h{sup n}{nu}fh character reflects the strong ({nu}fh)8{sup +} two-body attraction which gives rise to pronounced yrast line dips. We have also carried out full shell model calculations of these yrast lines, which are in excellent agreement with the experimental data. Since we take all dynamic input values, i.e. the two-body matrix elements and the single particle energies, from experiment, the calculations are free of any adjusted parameter. An interesting new result is the systematic identification in the {pi}h{sup n}{sub 11/2}{nu}fh configuration of yrast states formed by specific proton couplings, where the strongly attractive ({pi}h{sub 11/2}{nu}h{sub 9/2})1{sup +} interaction is activated. As a consequence these states drop down to the yrast lines and in energy below the maximum aligned state of the next lower proton seniority.}
place = {Germany}
year = {1993}
month = {Dec}
}