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Title: γ-ray decay from neutron-bound and unbound states in 95Mo and a novel technique for spin determination

Abstract

The emission of γ rays from neutron-bound and neutron-unbound states in 95Mo, populated in the 94Mo(d,p) reaction, has been investigated. Charged particles and γ radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing p-γ and p-γ-γ coincidences, the 95Mo level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below ≈2 MeV. From p-γ coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the (d,p) reaction above the neutron separation energy. As a result, spins for almost all 95Mo levels below 2 MeV (and for a few levels above) have been determined with this method.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [5];  [8];  [9];  [6];  [5];  [10];  [5];  [11];  [5];  [5];  [5];  [6] more »;  [12] « less
  1. iThemba LABS, Somerset West (South Africa)
  2. Charles Univ., Prague (Czech Republic)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
  4. Univ. of Richmond, Richmond, VA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  9. Univ. of California, Berkeley, CA (United States)
  10. Univ. of Oslo, Oslo (Norway)
  11. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Wisconsin-La Crosse, La Crosse, WI (United States)
  12. Florida State Univ., Tallahassee, FL (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); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1266017
Alternate Identifier(s):
OSTI ID: 1236537; OSTI ID: 1379229; OSTI ID: 1474373
Report Number(s):
LLNL-JRNL-678755
Journal ID: ISSN 2469-9985; KB0401022; ERKBP06
Grant/Contract Number:  
AC05-00OR22725; AC52-07NA27344; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 93; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Physics - Nuclear physics and radiation physics

Citation Formats

Wiedeking, M., Krticka, M., Bernstein, L. A., Allmond, James M., Basunia, M. S., Bleuel, D. L., Burke, J. T., Daub, B. H., Fallon, P., Firestone, R. B., Goldblum, B. L., Hatarik, R., Lake, P. T., Larsen, A. C., Lee, I. -Y., Lesher, S. R., Paschalis, S., Petri, M., Phair, L., Scielzo, N. D., and Volya, A. γ-ray decay from neutron-bound and unbound states in 95Mo and a novel technique for spin determination. United States: N. p., 2016. Web. doi:10.1103/PhysRevC.93.024303.
Wiedeking, M., Krticka, M., Bernstein, L. A., Allmond, James M., Basunia, M. S., Bleuel, D. L., Burke, J. T., Daub, B. H., Fallon, P., Firestone, R. B., Goldblum, B. L., Hatarik, R., Lake, P. T., Larsen, A. C., Lee, I. -Y., Lesher, S. R., Paschalis, S., Petri, M., Phair, L., Scielzo, N. D., & Volya, A. γ-ray decay from neutron-bound and unbound states in 95Mo and a novel technique for spin determination. United States. doi:10.1103/PhysRevC.93.024303.
Wiedeking, M., Krticka, M., Bernstein, L. A., Allmond, James M., Basunia, M. S., Bleuel, D. L., Burke, J. T., Daub, B. H., Fallon, P., Firestone, R. B., Goldblum, B. L., Hatarik, R., Lake, P. T., Larsen, A. C., Lee, I. -Y., Lesher, S. R., Paschalis, S., Petri, M., Phair, L., Scielzo, N. D., and Volya, A. Mon . "γ-ray decay from neutron-bound and unbound states in 95Mo and a novel technique for spin determination". United States. doi:10.1103/PhysRevC.93.024303. https://www.osti.gov/servlets/purl/1266017.
@article{osti_1266017,
title = {γ-ray decay from neutron-bound and unbound states in 95Mo and a novel technique for spin determination},
author = {Wiedeking, M. and Krticka, M. and Bernstein, L. A. and Allmond, James M. and Basunia, M. S. and Bleuel, D. L. and Burke, J. T. and Daub, B. H. and Fallon, P. and Firestone, R. B. and Goldblum, B. L. and Hatarik, R. and Lake, P. T. and Larsen, A. C. and Lee, I. -Y. and Lesher, S. R. and Paschalis, S. and Petri, M. and Phair, L. and Scielzo, N. D. and Volya, A.},
abstractNote = {The emission of γ rays from neutron-bound and neutron-unbound states in 95Mo, populated in the 94Mo(d,p) reaction, has been investigated. Charged particles and γ radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing p-γ and p-γ-γ coincidences, the 95Mo level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below ≈2 MeV. From p-γ coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the (d,p) reaction above the neutron separation energy. As a result, spins for almost all 95Mo levels below 2 MeV (and for a few levels above) have been determined with this method.},
doi = {10.1103/PhysRevC.93.024303},
journal = {Physical Review C},
number = 2,
volume = 93,
place = {United States},
year = {2016},
month = {2}
}

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