Shears mechanism in Cd-109

C J Chiara; S J Asztalos; B Busse; R M Clark; M Cromaz; M A Deleplanque; R M Diamond; P Fallon; D B Fossan; D G Jenkins; S Juutinen; N S Kelsall; R Krucken; G J Lane; I Y Lee; A O Macchiavelli; R W MacLeod; G Schmid; J M Sears; J F Smith; F S Stephens; K Vetter; R Wadsworth; S Frauendorf

Shears mechanism in Cd-109

C J Chiara, S J Asztalos, B Busse, R M Clark, M Cromaz, M A Deleplanque, R M Diamond, P Fallon, D B Fossan, D G Jenkins, S Juutinen, N S Kelsall, R Krucken, G J Lane, I Y Lee, A O Macchiavelli, R W MacLeod, G Schmid, J M Sears, J F SmithF S Stephens, K Vetter, R Wadsworth, S Frauendorf

Physics

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

Abstract

Lifetimes of high-spin states in two Delta I=1 bands and one Delta I=2 band in Cd-109 have been measured using the Doppler shift attenuation method in an experiment performed using the Zr-96(O-18,5n) reaction with the GAMMASPHERE array. Experimental total angular momenta and reduced transition strengths for both Delta I=1 bands were compared with tilted axis cranking (shears mechanism) predictions and the Delta I=2 band with principal axis cranking predictions, based on configurations involving two proton g(9/2) holes and one or three valence quasineutrons from the h(11/2) and mixed g(7/2)/d(5/2) orbitals. Good overall agreement for angular momentum versus rotational frequency has been observed in each case. The Delta I=2 band is shown to have a large J((2))/B(E2) ratio suggestive of antimagnetic rotation. Additionally, both dipole bands show a decreasing trend in B(M1) strength as a function of spin, a feature of the shears mechanism. The experimental results are also compared with a semiclassical model that employs effective interactions between the proton holes and neutrons as an alternate interpretation for the shears mechanism.

Original language	English
Article number	034318
Pages (from-to)	-
Number of pages	11
Journal	Physical Review C
Volume	6103
Issue number	3
Publication status	Published - Mar 2000

Keywords

MAGNETIC ROTATION
BANDS
STATES
LIFETIMES
PB-198
NUCLEI

Cite this

Chiara, C. J., Asztalos, S. J., Busse, B., Clark, R. M., Cromaz, M., Deleplanque, M. A., Diamond, R. M., Fallon, P., Fossan, D. B., Jenkins, D. G., Juutinen, S., Kelsall, N. S., Krucken, R., Lane, G. J., Lee, I. Y., Macchiavelli, A. O., MacLeod, R. W., Schmid, G., Sears, J. M., ... Frauendorf, S. (2000). Shears mechanism in Cd-109. Physical Review C, 6103(3), -. Article 034318.

@article{ce93d78bdeb5401eade169dd44a6faeb,

title = "Shears mechanism in Cd-109",

abstract = "Lifetimes of high-spin states in two Delta I=1 bands and one Delta I=2 band in Cd-109 have been measured using the Doppler shift attenuation method in an experiment performed using the Zr-96(O-18,5n) reaction with the GAMMASPHERE array. Experimental total angular momenta and reduced transition strengths for both Delta I=1 bands were compared with tilted axis cranking (shears mechanism) predictions and the Delta I=2 band with principal axis cranking predictions, based on configurations involving two proton g(9/2) holes and one or three valence quasineutrons from the h(11/2) and mixed g(7/2)/d(5/2) orbitals. Good overall agreement for angular momentum versus rotational frequency has been observed in each case. The Delta I=2 band is shown to have a large J((2))/B(E2) ratio suggestive of antimagnetic rotation. Additionally, both dipole bands show a decreasing trend in B(M1) strength as a function of spin, a feature of the shears mechanism. The experimental results are also compared with a semiclassical model that employs effective interactions between the proton holes and neutrons as an alternate interpretation for the shears mechanism.",

keywords = "MAGNETIC ROTATION, BANDS, STATES, LIFETIMES, PB-198, NUCLEI",

author = "Chiara, {C J} and Asztalos, {S J} and B Busse and Clark, {R M} and M Cromaz and Deleplanque, {M A} and Diamond, {R M} and P Fallon and Fossan, {D B} and Jenkins, {D G} and S Juutinen and Kelsall, {N S} and R Krucken and Lane, {G J} and Lee, {I Y} and Macchiavelli, {A O} and MacLeod, {R W} and G Schmid and Sears, {J M} and Smith, {J F} and Stephens, {F S} and K Vetter and R Wadsworth and S Frauendorf",

year = "2000",

month = mar,

language = "English",

volume = "6103",

pages = "--",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "3",

}

Chiara, CJ, Asztalos, SJ, Busse, B, Clark, RM, Cromaz, M, Deleplanque, MA, Diamond, RM, Fallon, P, Fossan, DB, Jenkins, DG, Juutinen, S, Kelsall, NS, Krucken, R, Lane, GJ, Lee, IY, Macchiavelli, AO, MacLeod, RW, Schmid, G, Sears, JM, Smith, JF, Stephens, FS, Vetter, K, Wadsworth, R & Frauendorf, S 2000, 'Shears mechanism in Cd-109', Physical Review C, vol. 6103, no. 3, 034318, pp. -.

TY - JOUR

T1 - Shears mechanism in Cd-109

AU - Chiara, C J

AU - Asztalos, S J

AU - Busse, B

AU - Clark, R M

AU - Cromaz, M

AU - Deleplanque, M A

AU - Diamond, R M

AU - Fallon, P

AU - Fossan, D B

AU - Jenkins, D G

AU - Juutinen, S

AU - Kelsall, N S

AU - Krucken, R

AU - Lane, G J

AU - Lee, I Y

AU - Macchiavelli, A O

AU - MacLeod, R W

AU - Schmid, G

AU - Sears, J M

AU - Smith, J F

AU - Stephens, F S

AU - Vetter, K

AU - Wadsworth, R

AU - Frauendorf, S

PY - 2000/3

Y1 - 2000/3

N2 - Lifetimes of high-spin states in two Delta I=1 bands and one Delta I=2 band in Cd-109 have been measured using the Doppler shift attenuation method in an experiment performed using the Zr-96(O-18,5n) reaction with the GAMMASPHERE array. Experimental total angular momenta and reduced transition strengths for both Delta I=1 bands were compared with tilted axis cranking (shears mechanism) predictions and the Delta I=2 band with principal axis cranking predictions, based on configurations involving two proton g(9/2) holes and one or three valence quasineutrons from the h(11/2) and mixed g(7/2)/d(5/2) orbitals. Good overall agreement for angular momentum versus rotational frequency has been observed in each case. The Delta I=2 band is shown to have a large J((2))/B(E2) ratio suggestive of antimagnetic rotation. Additionally, both dipole bands show a decreasing trend in B(M1) strength as a function of spin, a feature of the shears mechanism. The experimental results are also compared with a semiclassical model that employs effective interactions between the proton holes and neutrons as an alternate interpretation for the shears mechanism.

AB - Lifetimes of high-spin states in two Delta I=1 bands and one Delta I=2 band in Cd-109 have been measured using the Doppler shift attenuation method in an experiment performed using the Zr-96(O-18,5n) reaction with the GAMMASPHERE array. Experimental total angular momenta and reduced transition strengths for both Delta I=1 bands were compared with tilted axis cranking (shears mechanism) predictions and the Delta I=2 band with principal axis cranking predictions, based on configurations involving two proton g(9/2) holes and one or three valence quasineutrons from the h(11/2) and mixed g(7/2)/d(5/2) orbitals. Good overall agreement for angular momentum versus rotational frequency has been observed in each case. The Delta I=2 band is shown to have a large J((2))/B(E2) ratio suggestive of antimagnetic rotation. Additionally, both dipole bands show a decreasing trend in B(M1) strength as a function of spin, a feature of the shears mechanism. The experimental results are also compared with a semiclassical model that employs effective interactions between the proton holes and neutrons as an alternate interpretation for the shears mechanism.

KW - MAGNETIC ROTATION

KW - BANDS

KW - STATES

KW - LIFETIMES

KW - PB-198

KW - NUCLEI

M3 - Article

SN - 2469-9985

VL - 6103

SP - -

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 034318

ER -