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Title: Constraining spectroscopic factors near the r -process path using combined measurements: Kr 86 ( d , p ) 87 Kr

Abstract

Background: Current nuclear structure models indicate that the shell structure near the valley of stability, with well-established shell closures at N=50, for example, changes in very neutron-rich nuclei far from stability. Single-particle properties of nuclei away from stability can be probed in single-neutron (d,p) transfer reactions with beams of rare isotopes. The interpretation of these data requires reaction theories with various effective interactions. Often, approximations made to the final bound-state potential introduce a large uncertainty in the extracted single-particle properties, in particular the spectroscopic factor. Purpose: Mitigate this uncertainty using a combined measurement method to constrain the shape of the bound-state potential and to reliably extract the spectroscopic factor. Methods: The 2H( 86Kr,p) 87Kr reaction was measured at 33 MeV/u at the National Superconducting Cyclotron Laboratory (NSCL) as a test of the combined method. The reaction protons were detected with the Oak Ridge Rutgers University Barrel Array (ORRUBA) of position sensitive silicon strip detectors, the first implementation of ORRUBA coupled to the S800 spectrograph with fast beams at NSCL. Results: These measurements at 33 MeV/u are combined with previous studies of the 86Kr(d,p) reaction at 5.5 MeV/u to demonstrate a successful case of the combined method to constrain the shape of the single-particle potential and deduce asymptotic normalization coefficients and spectroscopic factors. In particular, the single-particle asymptotic normalization coefficient for the ground state of 87Kr was constrained to b d5/2=6.46$$^{+1.12}_{–0.57}$$ fm –1/2, and therefore the deduced spectroscopic factor is S=0.44$$^{+0.09}_{–0.13}$$ with uncertainties dominated by experimental statistics.Conclusions: By combining measurements at two very different beam energies, single-particle asymptotic normalization coefficients, at least for low angular momentum transfers, can be constrained. Thus, spectroscopic factors can be deduced with uncertainties dominated by experimental uncertainties, rather than limited knowledge of bound-state potential parameters.

Authors:
 [1];  [2];  [1];  [3];  [4];  [1];  [5];  [6];  [6];  [1];  [7];  [8];  [8];  [9];  [1];  [1];  [10];  [5];  [11];  [6] more »;  [1];  [7];  [8];  [6] « less
  1. Rutgers Univ., New Brunswick, NJ (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Univ. of Notre Dame, IN (United States)
  6. National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  8. Univ. of Tennessee, Knoxville, TN (United States)
  9. Tennessee Technological Univ., Cookeville, TN (United States)
  10. National Superconducting Cyclotron Lab., East Lansing, MI (United States); Michigan State Univ., East Lansing, MI (United States)
  11. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Rutgers Univ., Piscataway, NJ (United States); Univ. of Tennessee, Knoxville, TN (United States); Tennessee Technological Univ., Cookeville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration
OSTI Identifier:
1566953
Alternate Identifier(s):
OSTI ID: 1515592; OSTI ID: 1619203
Grant/Contract Number:  
NA0002132; FG52-08NA28552; AC05-00OR22725; FG02-96ER40983; SC0001174; FG02-96ER40955; NA0003897; PHY-1404218; PHY-1068571; PHY-1403906; PHY-1102511; PHY-1419765
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 99; Journal Issue: 5; 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

Walter, D., Pain, S. D., Cizewski, J. A., Nunes, F. M., Ahn, S., Baugher, T., Bardayan, D. W., Baumann, T., Bazin, D., Burcher, S., Chipps, K. A., Cerizza, G., Jones, K. L., Kozub, R. L., Lonsdale, S. J., Manning, B., Montes, F., O'Malley, P. D., Ota, S., Pereira, J., Ratkiewicz, A., Thompson, P., Thornsberry, C., and Williams, S. Constraining spectroscopic factors near the r -process path using combined measurements: Kr86 (d, p)87Kr. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.99.054625.
Walter, D., Pain, S. D., Cizewski, J. A., Nunes, F. M., Ahn, S., Baugher, T., Bardayan, D. W., Baumann, T., Bazin, D., Burcher, S., Chipps, K. A., Cerizza, G., Jones, K. L., Kozub, R. L., Lonsdale, S. J., Manning, B., Montes, F., O'Malley, P. D., Ota, S., Pereira, J., Ratkiewicz, A., Thompson, P., Thornsberry, C., & Williams, S. Constraining spectroscopic factors near the r -process path using combined measurements: Kr86 (d, p)87Kr. United States. doi:10.1103/PhysRevC.99.054625.
Walter, D., Pain, S. D., Cizewski, J. A., Nunes, F. M., Ahn, S., Baugher, T., Bardayan, D. W., Baumann, T., Bazin, D., Burcher, S., Chipps, K. A., Cerizza, G., Jones, K. L., Kozub, R. L., Lonsdale, S. J., Manning, B., Montes, F., O'Malley, P. D., Ota, S., Pereira, J., Ratkiewicz, A., Thompson, P., Thornsberry, C., and Williams, S. Fri . "Constraining spectroscopic factors near the r -process path using combined measurements: Kr86 (d, p)87Kr". United States. doi:10.1103/PhysRevC.99.054625. https://www.osti.gov/servlets/purl/1566953.
@article{osti_1566953,
title = {Constraining spectroscopic factors near the r -process path using combined measurements: Kr86 (d, p)87Kr},
author = {Walter, D. and Pain, S. D. and Cizewski, J. A. and Nunes, F. M. and Ahn, S. and Baugher, T. and Bardayan, D. W. and Baumann, T. and Bazin, D. and Burcher, S. and Chipps, K. A. and Cerizza, G. and Jones, K. L. and Kozub, R. L. and Lonsdale, S. J. and Manning, B. and Montes, F. and O'Malley, P. D. and Ota, S. and Pereira, J. and Ratkiewicz, A. and Thompson, P. and Thornsberry, C. and Williams, S.},
abstractNote = {Background: Current nuclear structure models indicate that the shell structure near the valley of stability, with well-established shell closures at N=50, for example, changes in very neutron-rich nuclei far from stability. Single-particle properties of nuclei away from stability can be probed in single-neutron (d,p) transfer reactions with beams of rare isotopes. The interpretation of these data requires reaction theories with various effective interactions. Often, approximations made to the final bound-state potential introduce a large uncertainty in the extracted single-particle properties, in particular the spectroscopic factor. Purpose: Mitigate this uncertainty using a combined measurement method to constrain the shape of the bound-state potential and to reliably extract the spectroscopic factor. Methods: The 2H(86Kr,p)87Kr reaction was measured at 33 MeV/u at the National Superconducting Cyclotron Laboratory (NSCL) as a test of the combined method. The reaction protons were detected with the Oak Ridge Rutgers University Barrel Array (ORRUBA) of position sensitive silicon strip detectors, the first implementation of ORRUBA coupled to the S800 spectrograph with fast beams at NSCL. Results: These measurements at 33 MeV/u are combined with previous studies of the 86Kr(d,p) reaction at 5.5 MeV/u to demonstrate a successful case of the combined method to constrain the shape of the single-particle potential and deduce asymptotic normalization coefficients and spectroscopic factors. In particular, the single-particle asymptotic normalization coefficient for the ground state of 87Kr was constrained to bd5/2=6.46$^{+1.12}_{–0.57}$ fm–1/2, and therefore the deduced spectroscopic factor is S=0.44$^{+0.09}_{–0.13}$ with uncertainties dominated by experimental statistics.Conclusions: By combining measurements at two very different beam energies, single-particle asymptotic normalization coefficients, at least for low angular momentum transfers, can be constrained. Thus, spectroscopic factors can be deduced with uncertainties dominated by experimental uncertainties, rather than limited knowledge of bound-state potential parameters.},
doi = {10.1103/PhysRevC.99.054625},
journal = {Physical Review C},
issn = {2469-9985},
number = 5,
volume = 99,
place = {United States},
year = {2019},
month = {5}
}

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