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Title: Z = 50 core stability in 110Sn from magnetic-moment and lifetime measurements

Abstract

In this study, the structure of the semimagic Sn50 isotopes were previously studied via measurements of B(E2;2 1 + → 0 1 +) and g factors of 2 1 + states. The values of the B(E2;2 1 +) in the isotopes below midshell at N = 66 show an enhancement in collectivity, contrary to predictions from shell-model calculations. This work presents the first measurement of the 2 1 + and 4 1 + states' magnetic moments in the unstable neutron-deficient 110Sn. The g factors provide complementary structure information to the interpretation of the observed B(E2) values.

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [6]; ;  [6];  [5];  [3];  [7];  [5];  [6];  [8];  [6];  [6];  [6];  [5];  [3] more »;  [7];  [1];  [5] « less
  1. Rutgers Univ., New Brunswick, NJ (United States)
  2. Univ. Bonn, Bonn (Germany)
  3. Univ. Nacional de Colombia, Bogota D.C. (Columbia)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Univ. of California, Berkeley, CA (United States)
  7. Millsaps College, Jackson, MS (United States)
  8. 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). Holifield Radioactive Ion Beam Facility (HRIBF); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1263878
Alternate Identifier(s):
OSTI ID: 1247910; OSTI ID: 1379289
Grant/Contract Number:
AC05-00OR22725; AC52-07NA27344; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 93; Journal Issue: 4; 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

Kumbartzki, G. J., Benczer-Koller, N., Speidel, K. -H., Torres, D. A., Allmond, James M., Fallon, P., Abramovic, I., L. A. Bernstein, Bevins, J. E., Crawford, H. L., Guevara, Z. E., Gurdal, G., Hurst, A. M., Kirsch, L., Laplace, T. A., Lo, A., Matthews, E. F., Mayers, I., Phair, L. W., Ramirez, F., Robinson, S. J. Q., Sharon, Y. Y., and Wiens, A. Z = 50 core stability in 110Sn from magnetic-moment and lifetime measurements. United States: N. p., 2016. Web. doi:10.1103/PhysRevC.93.044316.
Kumbartzki, G. J., Benczer-Koller, N., Speidel, K. -H., Torres, D. A., Allmond, James M., Fallon, P., Abramovic, I., L. A. Bernstein, Bevins, J. E., Crawford, H. L., Guevara, Z. E., Gurdal, G., Hurst, A. M., Kirsch, L., Laplace, T. A., Lo, A., Matthews, E. F., Mayers, I., Phair, L. W., Ramirez, F., Robinson, S. J. Q., Sharon, Y. Y., & Wiens, A. Z = 50 core stability in 110Sn from magnetic-moment and lifetime measurements. United States. doi:10.1103/PhysRevC.93.044316.
Kumbartzki, G. J., Benczer-Koller, N., Speidel, K. -H., Torres, D. A., Allmond, James M., Fallon, P., Abramovic, I., L. A. Bernstein, Bevins, J. E., Crawford, H. L., Guevara, Z. E., Gurdal, G., Hurst, A. M., Kirsch, L., Laplace, T. A., Lo, A., Matthews, E. F., Mayers, I., Phair, L. W., Ramirez, F., Robinson, S. J. Q., Sharon, Y. Y., and Wiens, A. Mon . "Z = 50 core stability in 110Sn from magnetic-moment and lifetime measurements". United States. doi:10.1103/PhysRevC.93.044316. https://www.osti.gov/servlets/purl/1263878.
@article{osti_1263878,
title = {Z = 50 core stability in 110Sn from magnetic-moment and lifetime measurements},
author = {Kumbartzki, G. J. and Benczer-Koller, N. and Speidel, K. -H. and Torres, D. A. and Allmond, James M. and Fallon, P. and Abramovic, I. and L. A. Bernstein and Bevins, J. E. and Crawford, H. L. and Guevara, Z. E. and Gurdal, G. 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 Robinson, S. J. Q. and Sharon, Y. Y. and Wiens, A.},
abstractNote = {In this study, 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. This work presents the first measurement of the 21+ and 41+ states' magnetic moments in the unstable neutron-deficient 110Sn. The g factors provide complementary structure information to the interpretation of the observed B(E2) values.},
doi = {10.1103/PhysRevC.93.044316},
journal = {Physical Review C},
number = 4,
volume = 93,
place = {United States},
year = {Mon Apr 18 00:00:00 EDT 2016},
month = {Mon Apr 18 00:00:00 EDT 2016}
}

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  • 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
  • Rare isotope beams of neutron-deficient {sup 106,108,110}Sn from the fragmentation of {sup 124}Xe were employed in an intermediate-energy Coulomb excitation experiment. The measured B(E2,0{sub 1}{sup +}{yields}2{sub 1}{sup +}) values for {sup 108}Sn and {sup 110}Sn and the results obtained for the {sup 106}Sn show that the transition strengths for these nuclei are larger than predicted by current state-of-the-art shell-model calculations. This discrepancy might be explained by contributions of the protons from within the Z=50 shell to the structure of low-energy excited states in this region.
  • Excited states of neutron deficient nuclei close to {sup 100}Sn were investigated in an in-beam spectroscopic experiment using the NORDBALL detector array. Excited states in {sup 99}Cd were identified for the first time. The measured half-life of an isomeric state in {sup 99}Cd indicates that the stability with respect to quadrupole shape changes is as large in {sup 100}Sn as for other heavy doubly magic nuclei. {copyright} {ital 1996 The American Physical Society.}