COLLECTIVE OBLATE DIPOLE ROTATIONAL BANDS IN PB-198

R M Clark; R Wadsworth; E S Paul; C W Beausang; I Ali; A Astier; D M Cullen; P J Dagnall; P Fallon; M J Joyce; M Meyer; N Redon; P H Regan; J F Sharpeyschafer; W Nazarewicz; R Wyss

COLLECTIVE OBLATE DIPOLE ROTATIONAL BANDS IN PB-198

R M Clark, R Wadsworth, E S Paul, C W Beausang, I Ali, A Astier, D M Cullen, P J Dagnall, P Fallon, M J Joyce, M Meyer, N Redon, P H Regan, J F Sharpeyschafer, W Nazarewicz, R Wyss

Physics

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

Abstract

The nucleus 198Pb was populated via the W-186(O-17, 5n)198Pb reaction at beam energies of 92 and 98 MeV. Five collective rotational cascades of DELTAI = 1 transitions have been found. Four are highly regular, one much more irregular. The structures are incorporated into a level scheme which extends up to approximately spin 32HBAR and an excitation energy of about 10 MeV. Angular correlation measurements confirm the dipole character of the interband transitions. Their M1 multipolarity is inferred, and from this supposition the experimental data are interpreted in terms of oblate high-K two quasiproton configurations coupled to aligned neutron excitations. This interpretation is extended to include other DELTAI = 1 oblate structures observed in 194-201Pb. It is shown that the pattern of observed moments of inertia can be understood in the simple unpaired picture involving neutron i13/2 excitations. The identical bands observed are interpreted in terms of the normal-parity weakly-coupled singlet orbital.

Original language	English
Pages (from-to)	121-156
Number of pages	36
Journal	Nuclear Physics A
Volume	562
Issue number	1
Publication status	Published - 13 Sept 1993

Keywords

W-186(O-17, XN)
E = 92, 98, 110-MEV
MEASURED E-GAMMA,I-GAMMA, GAMMA-GAMMA-COIN
198PB DEDUCED LEVELS
BAND STRUCTURE, COMPTON-SUPPRESSED GE DETECTORS
CRANKED WOODS-SAXON CALCULATIONS
DEFICIENT PB ISOTOPES
SUPERDEFORMED BANDS
SHAPE COEXISTENCE
MASS REGION
STATES
SPECTROSCOPY
NUCLEI
PB-200
EXCITATIONS
TRANSITIONS

Cite this

@article{b64d552b13704f1588067b1cd3dd47b3,

title = "COLLECTIVE OBLATE DIPOLE ROTATIONAL BANDS IN PB-198",

abstract = "The nucleus 198Pb was populated via the W-186(O-17, 5n)198Pb reaction at beam energies of 92 and 98 MeV. Five collective rotational cascades of DELTAI = 1 transitions have been found. Four are highly regular, one much more irregular. The structures are incorporated into a level scheme which extends up to approximately spin 32HBAR and an excitation energy of about 10 MeV. Angular correlation measurements confirm the dipole character of the interband transitions. Their M1 multipolarity is inferred, and from this supposition the experimental data are interpreted in terms of oblate high-K two quasiproton configurations coupled to aligned neutron excitations. This interpretation is extended to include other DELTAI = 1 oblate structures observed in 194-201Pb. It is shown that the pattern of observed moments of inertia can be understood in the simple unpaired picture involving neutron i13/2 excitations. The identical bands observed are interpreted in terms of the normal-parity weakly-coupled singlet orbital.",

keywords = "W-186(O-17, XN), E = 92, 98, 110-MEV, MEASURED E-GAMMA,I-GAMMA, GAMMA-GAMMA-COIN, 198PB DEDUCED LEVELS, BAND STRUCTURE, COMPTON-SUPPRESSED GE DETECTORS, CRANKED WOODS-SAXON CALCULATIONS, DEFICIENT PB ISOTOPES, SUPERDEFORMED BANDS, SHAPE COEXISTENCE, MASS REGION, STATES, SPECTROSCOPY, NUCLEI, PB-200, EXCITATIONS, TRANSITIONS",

author = "Clark, {R M} and R Wadsworth and Paul, {E S} and Beausang, {C W} and I Ali and A Astier and Cullen, {D M} and Dagnall, {P J} and P Fallon and Joyce, {M J} and M Meyer and N Redon and Regan, {P H} and Sharpeyschafer, {J F} and W Nazarewicz and R Wyss",

year = "1993",

month = sep,

day = "13",

language = "English",

volume = "562",

pages = "121--156",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier",

number = "1",

}

TY - JOUR

T1 - COLLECTIVE OBLATE DIPOLE ROTATIONAL BANDS IN PB-198

AU - Clark, R M

AU - Wadsworth, R

AU - Paul, E S

AU - Beausang, C W

AU - Ali, I

AU - Astier, A

AU - Cullen, D M

AU - Dagnall, P J

AU - Fallon, P

AU - Joyce, M J

AU - Meyer, M

AU - Redon, N

AU - Regan, P H

AU - Sharpeyschafer, J F

AU - Nazarewicz, W

AU - Wyss, R

PY - 1993/9/13

Y1 - 1993/9/13

N2 - The nucleus 198Pb was populated via the W-186(O-17, 5n)198Pb reaction at beam energies of 92 and 98 MeV. Five collective rotational cascades of DELTAI = 1 transitions have been found. Four are highly regular, one much more irregular. The structures are incorporated into a level scheme which extends up to approximately spin 32HBAR and an excitation energy of about 10 MeV. Angular correlation measurements confirm the dipole character of the interband transitions. Their M1 multipolarity is inferred, and from this supposition the experimental data are interpreted in terms of oblate high-K two quasiproton configurations coupled to aligned neutron excitations. This interpretation is extended to include other DELTAI = 1 oblate structures observed in 194-201Pb. It is shown that the pattern of observed moments of inertia can be understood in the simple unpaired picture involving neutron i13/2 excitations. The identical bands observed are interpreted in terms of the normal-parity weakly-coupled singlet orbital.

AB - The nucleus 198Pb was populated via the W-186(O-17, 5n)198Pb reaction at beam energies of 92 and 98 MeV. Five collective rotational cascades of DELTAI = 1 transitions have been found. Four are highly regular, one much more irregular. The structures are incorporated into a level scheme which extends up to approximately spin 32HBAR and an excitation energy of about 10 MeV. Angular correlation measurements confirm the dipole character of the interband transitions. Their M1 multipolarity is inferred, and from this supposition the experimental data are interpreted in terms of oblate high-K two quasiproton configurations coupled to aligned neutron excitations. This interpretation is extended to include other DELTAI = 1 oblate structures observed in 194-201Pb. It is shown that the pattern of observed moments of inertia can be understood in the simple unpaired picture involving neutron i13/2 excitations. The identical bands observed are interpreted in terms of the normal-parity weakly-coupled singlet orbital.

KW - W-186(O-17, XN)

KW - E = 92, 98, 110-MEV

KW - MEASURED E-GAMMA,I-GAMMA, GAMMA-GAMMA-COIN

KW - 198PB DEDUCED LEVELS

KW - BAND STRUCTURE, COMPTON-SUPPRESSED GE DETECTORS

KW - CRANKED WOODS-SAXON CALCULATIONS

KW - DEFICIENT PB ISOTOPES

KW - SUPERDEFORMED BANDS

KW - SHAPE COEXISTENCE

KW - MASS REGION

KW - STATES

KW - SPECTROSCOPY

KW - NUCLEI

KW - PB-200

KW - EXCITATIONS

KW - TRANSITIONS

M3 - Article

SN - 0375-9474

VL - 562

SP - 121

EP - 156

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 1

ER -