Dipole bands and multi-quasiparticle excitations in Pb-193

L Ducroux; A Astier; R Duffait; Y LeCoz; M Meyer; S Perries; N Redon; J F SharpeySchafer; A N Wilson; R Lucas; V Meot; R Collatz; I Deloncle; F Hannachi; A LopezMartens; M G Porquet; C Schuck; F Azaiez; S Bouneau; C Bourgeois; A Korichi; N Poffe; H Sergolle; B J P Gall; I Hibbert; R Wadsworth

Dipole bands and multi-quasiparticle excitations in Pb-193

L Ducroux, A Astier, R Duffait, Y LeCoz, M Meyer, S Perries, N Redon, J F SharpeySchafer, A N Wilson, R Lucas, V Meot, R Collatz, I Deloncle, F Hannachi, A LopezMartens, M G Porquet, C Schuck, F Azaiez, S Bouneau, C BourgeoisA Korichi, N Poffe, H Sergolle, B J P Gall, I Hibbert, R Wadsworth

Physics

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

Abstract

The nucleus Pb-193 was populated via the Er-168(Si-30,5n) reaction at a beam energy of 159 MeV and studied with the EUROGAM II spectrometer. Five new dipole Delta I = 1 cascades have been found. These structures have been connected to the level scheme which has been considerably extended up to a spin of 61/2 HBAR and an excitation energy of about 8 MeV. Angular distribution coefficients, a(2), have been measured and confirm the dipole character of the in-band transitions. B(M1)/B(E2) ratios have been extracted for the two most intense cascades. The Pb-193 dipole bands are discussed in comparison with those known in odd lead isotopic series and the structure of the band heads is analyzed in terms of microscopic HF+BCS calculations. The proposed configurations are based on a high-it two quasiproton excitation, pi ([505]9/2(-) x [606]13/2(+))(K=11-), coupled to one or three rotation aligned quasineutrons involving the i(13/2), p(3/2), f(5/2) and/or h(9/2) subshells, The main difference, compared with the heavier lead isotopes, is the presence of large Omega orbitals from the nu (i(13/2)) shell near the Fermi surface which are responsible for the increasing band-head spin as A decreases.

Original language	English
Pages (from-to)	241-249
Number of pages	9
Journal	Zeitschrift fur physik a-Hadrons and nuclei
Volume	356
Issue number	3
Publication status	Published - Dec 1996

Keywords

SHEARS BANDS
COLLECTIVE OBLATE
STATES
QUADRUPOLE
PB-200

Cite this

Ducroux, L., Astier, A., Duffait, R., LeCoz, Y., Meyer, M., Perries, S., Redon, N., SharpeySchafer, J. F., Wilson, A. N., Lucas, R., Meot, V., Collatz, R., Deloncle, I., Hannachi, F., LopezMartens, A., Porquet, M. G., Schuck, C., Azaiez, F., Bouneau, S., ... Wadsworth, R. (1996). Dipole bands and multi-quasiparticle excitations in Pb-193. Zeitschrift fur physik a-Hadrons and nuclei, 356(3), 241-249.

@article{610fac39fa844e01a168431e9cc59384,

title = "Dipole bands and multi-quasiparticle excitations in Pb-193",

abstract = "The nucleus Pb-193 was populated via the Er-168(Si-30,5n) reaction at a beam energy of 159 MeV and studied with the EUROGAM II spectrometer. Five new dipole Delta I = 1 cascades have been found. These structures have been connected to the level scheme which has been considerably extended up to a spin of 61/2 HBAR and an excitation energy of about 8 MeV. Angular distribution coefficients, a(2), have been measured and confirm the dipole character of the in-band transitions. B(M1)/B(E2) ratios have been extracted for the two most intense cascades. The Pb-193 dipole bands are discussed in comparison with those known in odd lead isotopic series and the structure of the band heads is analyzed in terms of microscopic HF+BCS calculations. The proposed configurations are based on a high-it two quasiproton excitation, pi ([505]9/2(-) x [606]13/2(+))(K=11-), coupled to one or three rotation aligned quasineutrons involving the i(13/2), p(3/2), f(5/2) and/or h(9/2) subshells, The main difference, compared with the heavier lead isotopes, is the presence of large Omega orbitals from the nu (i(13/2)) shell near the Fermi surface which are responsible for the increasing band-head spin as A decreases.",

keywords = "SHEARS BANDS, COLLECTIVE OBLATE, STATES, QUADRUPOLE, PB-200",

author = "L Ducroux and A Astier and R Duffait and Y LeCoz and M Meyer and S Perries and N Redon and SharpeySchafer, {J F} and Wilson, {A N} and R Lucas and V Meot and R Collatz and I Deloncle and F Hannachi and A LopezMartens and Porquet, {M G} and C Schuck and F Azaiez and S Bouneau and C Bourgeois and A Korichi and N Poffe and H Sergolle and Gall, {B J P} and I Hibbert and R Wadsworth",

year = "1996",

month = dec,

language = "English",

volume = "356",

pages = "241--249",

journal = "Zeitschrift fur physik a-Hadrons and nuclei",

issn = "0939-7922",

publisher = "Springer",

number = "3",

}

Ducroux, L, Astier, A, Duffait, R, LeCoz, Y, Meyer, M, Perries, S, Redon, N, SharpeySchafer, JF, Wilson, AN, Lucas, R, Meot, V, Collatz, R, Deloncle, I, Hannachi, F, LopezMartens, A, Porquet, MG, Schuck, C, Azaiez, F, Bouneau, S, Bourgeois, C, Korichi, A, Poffe, N, Sergolle, H, Gall, BJP, Hibbert, I & Wadsworth, R 1996, 'Dipole bands and multi-quasiparticle excitations in Pb-193', Zeitschrift fur physik a-Hadrons and nuclei, vol. 356, no. 3, pp. 241-249.

TY - JOUR

T1 - Dipole bands and multi-quasiparticle excitations in Pb-193

AU - Ducroux, L

AU - Astier, A

AU - Duffait, R

AU - LeCoz, Y

AU - Meyer, M

AU - Perries, S

AU - Redon, N

AU - SharpeySchafer, J F

AU - Wilson, A N

AU - Lucas, R

AU - Meot, V

AU - Collatz, R

AU - Deloncle, I

AU - Hannachi, F

AU - LopezMartens, A

AU - Porquet, M G

AU - Schuck, C

AU - Azaiez, F

AU - Bouneau, S

AU - Bourgeois, C

AU - Korichi, A

AU - Poffe, N

AU - Sergolle, H

AU - Gall, B J P

AU - Hibbert, I

AU - Wadsworth, R

PY - 1996/12

Y1 - 1996/12

N2 - The nucleus Pb-193 was populated via the Er-168(Si-30,5n) reaction at a beam energy of 159 MeV and studied with the EUROGAM II spectrometer. Five new dipole Delta I = 1 cascades have been found. These structures have been connected to the level scheme which has been considerably extended up to a spin of 61/2 HBAR and an excitation energy of about 8 MeV. Angular distribution coefficients, a(2), have been measured and confirm the dipole character of the in-band transitions. B(M1)/B(E2) ratios have been extracted for the two most intense cascades. The Pb-193 dipole bands are discussed in comparison with those known in odd lead isotopic series and the structure of the band heads is analyzed in terms of microscopic HF+BCS calculations. The proposed configurations are based on a high-it two quasiproton excitation, pi ([505]9/2(-) x [606]13/2(+))(K=11-), coupled to one or three rotation aligned quasineutrons involving the i(13/2), p(3/2), f(5/2) and/or h(9/2) subshells, The main difference, compared with the heavier lead isotopes, is the presence of large Omega orbitals from the nu (i(13/2)) shell near the Fermi surface which are responsible for the increasing band-head spin as A decreases.

AB - The nucleus Pb-193 was populated via the Er-168(Si-30,5n) reaction at a beam energy of 159 MeV and studied with the EUROGAM II spectrometer. Five new dipole Delta I = 1 cascades have been found. These structures have been connected to the level scheme which has been considerably extended up to a spin of 61/2 HBAR and an excitation energy of about 8 MeV. Angular distribution coefficients, a(2), have been measured and confirm the dipole character of the in-band transitions. B(M1)/B(E2) ratios have been extracted for the two most intense cascades. The Pb-193 dipole bands are discussed in comparison with those known in odd lead isotopic series and the structure of the band heads is analyzed in terms of microscopic HF+BCS calculations. The proposed configurations are based on a high-it two quasiproton excitation, pi ([505]9/2(-) x [606]13/2(+))(K=11-), coupled to one or three rotation aligned quasineutrons involving the i(13/2), p(3/2), f(5/2) and/or h(9/2) subshells, The main difference, compared with the heavier lead isotopes, is the presence of large Omega orbitals from the nu (i(13/2)) shell near the Fermi surface which are responsible for the increasing band-head spin as A decreases.

KW - SHEARS BANDS

KW - COLLECTIVE OBLATE

KW - STATES

KW - QUADRUPOLE

KW - PB-200

M3 - Article

SN - 0939-7922

VL - 356

SP - 241

EP - 249

JO - Zeitschrift fur physik a-Hadrons and nuclei

JF - Zeitschrift fur physik a-Hadrons and nuclei

IS - 3

ER -