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Title: Magnetic moment and lifetime measurements of Coulomb-excited states in Cd 106

Abstract

The Cd isotopes are well studied, but experimental data for the rare isotopes are sparse. At energies above the Coulomb barrier, higher states become accessible. Remeasure and supplement existing lifetimes and magnetic moments of low-lying states in 106Cd. Methods: In an inverse kinematics reaction, a 106Cd beam impinging on a 12C target was used to Coulomb excite the projectiles. The high recoil velocities provide a unique opportunity to measure g factors with the transient-field technique and to determine lifetimes from lineshapes by using the Doppler-shift-attenuation method. Large-scale shell-model calculations were carried out for 106Cd. As a result, the g factors of the 2 + 1 and 4 + 1 states in 106Cd were measured to be g(2 + 1) = +0.398(22) and g(4 + 1) = +0.23(5). A lineshape analysis yielded lifetimes in disagreement with published values. The new results are τ( 106Cd; 2 + 1) = 7.0(3) ps and τ( 106Cd; 4 + 1) = 2.5(2) ps. The mean life τ( 106Cd; 2 + 2) = 0.28(2) ps was determined from the fully-Doppler-shifted γ line. Mean lives of τ( 106Cd; 4 + 3) = 1.1(1) ps and τ( 106Cd; 3 1) = 0.16(1) ps were determined for themore » first time. In conclusion, the newly measured g(4 + 1) of 106Cd is found to be only 59% of the g(2 + 1). This difference cannot be explained by either shell-model or collective-model calculations.« less

Authors:
 [1];  [1];  [2];  [3];  [4];  [1];  [5];  [6];  [7];  [8];  [7];  [6];  [3];  [6];  [7];  [9];  [7];  [7];  [7];  [6] more »;  [3];  [6] « less
  1. Rutgers Univ., New Brunswick, NJ (United States)
  2. Univ. Bonn, Bonn (Germany)
  3. Univ. Nacional de Colombia, Bogota D.C. (Columbia)
  4. Millsaps College, Jackson, MS (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  7. Univ. of California, Berkeley, CA (United States)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  9. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1324208
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231; AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 3; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Benczer-Koller, N., Kumbartzki, G. J., Speidel, K. -H., Torres, D. A., Robinson, S. J. Q., Sharon, Y. Y., Allmond, J. M., Fallon, P., Abramovic, I., Bernstein, L. A., Bevins, J. E., Crawford, H. L., Guevara, Z. E., Hurst, A. M., Kirsch, L., Laplace, T. A., Lo, A., Matthews, E. F., Mayers, I., Phair, L. W., Ramirez, F., and Wiens, A. Magnetic moment and lifetime measurements of Coulomb-excited states in Cd106. United States: N. p., 2016. Web. doi:10.1103/PhysRevC.94.034303.
Benczer-Koller, N., Kumbartzki, G. J., Speidel, K. -H., Torres, D. A., Robinson, S. J. Q., Sharon, Y. Y., Allmond, J. M., Fallon, P., Abramovic, I., Bernstein, L. A., Bevins, J. E., Crawford, H. L., Guevara, Z. E., Hurst, A. M., Kirsch, L., Laplace, T. A., Lo, A., Matthews, E. F., Mayers, I., Phair, L. W., Ramirez, F., & Wiens, A. Magnetic moment and lifetime measurements of Coulomb-excited states in Cd106. United States. doi:10.1103/PhysRevC.94.034303.
Benczer-Koller, N., Kumbartzki, G. J., Speidel, K. -H., Torres, D. A., Robinson, S. J. Q., Sharon, Y. Y., Allmond, J. M., Fallon, P., Abramovic, I., Bernstein, L. A., Bevins, J. E., Crawford, H. L., Guevara, Z. E., Hurst, A. M., Kirsch, L., Laplace, T. A., Lo, A., Matthews, E. F., Mayers, I., Phair, L. W., Ramirez, F., and Wiens, A. 2016. "Magnetic moment and lifetime measurements of Coulomb-excited states in Cd106". United States. doi:10.1103/PhysRevC.94.034303. https://www.osti.gov/servlets/purl/1324208.
@article{osti_1324208,
title = {Magnetic moment and lifetime measurements of Coulomb-excited states in Cd106},
author = {Benczer-Koller, N. and Kumbartzki, G. J. and Speidel, K. -H. and Torres, D. A. and Robinson, S. J. Q. and Sharon, Y. Y. and Allmond, J. M. and Fallon, P. and Abramovic, I. and Bernstein, L. A. and Bevins, J. E. and Crawford, H. L. and Guevara, Z. E. and Hurst, A. M. and Kirsch, L. and Laplace, T. A. and Lo, A. and Matthews, E. F. and Mayers, I. and Phair, L. W. and Ramirez, F. and Wiens, A.},
abstractNote = {The Cd isotopes are well studied, but experimental data for the rare isotopes are sparse. At energies above the Coulomb barrier, higher states become accessible. Remeasure and supplement existing lifetimes and magnetic moments of low-lying states in 106Cd. Methods: In an inverse kinematics reaction, a 106Cd beam impinging on a 12C target was used to Coulomb excite the projectiles. The high recoil velocities provide a unique opportunity to measure g factors with the transient-field technique and to determine lifetimes from lineshapes by using the Doppler-shift-attenuation method. Large-scale shell-model calculations were carried out for 106Cd. As a result, the g factors of the 2+1 and 4+1 states in 106Cd were measured to be g(2+1) = +0.398(22) and g(4+1) = +0.23(5). A lineshape analysis yielded lifetimes in disagreement with published values. The new results are τ(106Cd; 2+1) = 7.0(3) ps and τ(106Cd; 4+1) = 2.5(2) ps. The mean life τ(106Cd; 2+2) = 0.28(2) ps was determined from the fully-Doppler-shifted γ line. Mean lives of τ(106Cd; 4+3) = 1.1(1) ps and τ(106Cd; 3–1) = 0.16(1) ps were determined for the first time. In conclusion, the newly measured g(4+1) of 106Cd is found to be only 59% of the g(2+1). This difference cannot be explained by either shell-model or collective-model calculations.},
doi = {10.1103/PhysRevC.94.034303},
journal = {Physical Review C},
number = 3,
volume = 94,
place = {United States},
year = 2016,
month = 9
}

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  • The Cd isotopes are well studied, but experimental data for the rare isotopes are sparse. At energies above the Coulomb barrier, higher states become accessible. Purpose: Remeasure and supplement existing lifetimes and magnetic moments of low-lying states in Cd106. In an inverse kinematics reaction, a Cd106 beam impinging on a C12 target was used to Coulomb excite the projectiles. The high recoil velocities provide a unique opportunity to measure g factors with the transient-field technique and to determine lifetimes from lineshapes by using the Doppler-shift-attenuation method. Large-scale shell-model calculations were carried out for Cd106. The g factors of the 21+more » and 41+ states in Cd106 were measured to be g(21+)=+0.398(22) and g(41+)=+0.23(5). A lineshape analysis yielded lifetimes in disagreement with published values. The new results are τ(Cd106;21+)=7.0(3)ps and τ(Cd106;41+)=2.5(2)ps. The mean life τ(Cd106;22+)=0.28(2)ps was determined from the fully-Doppler-shifted γ line. Mean lives of τ(Cd106;43+)=1.1(1)ps and τ(Cd106;31-)=0.16(1)ps were determined for the first time. The newly measured g(41+) of Cd106 is found to be only 59% of the g(21+). This difference cannot be explained by either shell-model or collective-model calculations.« less
  • Cited by 1
  • Background: The structure of the semimagic Sn50 isotopes were previously studied via measurements of B(E2;21+→01+) and g factors of 21+ states. The values of the B(E2;21+) in the isotopes below midshell at N = 66 show an enhancement in collectivity, contrary to predictions from shell-model calculations. Purpose: This work presents the first measurement of the 21+ and 41+ states' magnetic moments in the unstable neutron-deficient Sn110. The g factors provide complementary structure information to the interpretation of the observed B(E2) values. Methods: The Sn110 nuclei have been produced in inverse kinematics in an α-particle transfer reaction from C12 to Cd106more » projectiles at 390, 400, and 410 MeV. The g factors have been measured with the transient field technique. Lifetimes have been determined from line shapes using the Doppler-shift attenuation method. Results: The g factors of the 21+ and 41+ states in Sn110 are g(21+) = +0.29(11) and g(41+) = +0.05(14), respectively. In addition, the g(41+) = +0.27(6) in Cd106 has been measured for the first time. A line-shape analysis yielded τ(110Sn;21+) = 0.81(10) ps and a lifetime of τ(110Sn;31-) = 0.25(5) ps was calculated from the fully Doppler-shifted γ line. Conclusions: No evidence has been found in Sn110 that would require excitation of protons from the closed Z=50 core.« less
  • Cited by 1