Constraining spectroscopic factors near the r -process path using combined measurements: Kr86 (d, p)87Kr

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.

doi:10.1103/PhysRevC.99.054625

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

Journal Article · Fri May 24 00:00:00 EDT 2019 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.99.054625· OSTI ID:1566953

Walter, D. ^[1]; Pain, S. D. ^[2]; Cizewski, J. A. ^[1]; Nunes, F. M. ^[3]; Ahn, S. ^[4]; Baugher, T. ^[1]; Bardayan, D. W. ^[5]; Baumann, T. ^[6]; Bazin, D. ^[6]; Burcher, S. ^[1]; Chipps, K. A. ^[7]; Cerizza, G. ^[8]; Jones, K. L. ^[8]; Kozub, R. L. ^[9]; Lonsdale, S. J. ^[1]; Manning, B. ^[1]; Montes, F. ^[10]; O'Malley, P. D. ^[5]; Ota, S. ^[11]; Pereira, J. ^[6] more »

Rutgers Univ., New Brunswick, NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
Michigan State Univ., East Lansing, MI (United States)
Univ. of Notre Dame, IN (United States)
National Superconducting Cyclotron Lab., East Lansing, MI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Tennessee Technological Univ., Cookeville, TN (United States)
National Superconducting Cyclotron Lab., East Lansing, MI (United States); Michigan State Univ., East Lansing, MI (United States)
Japan Atomic Energy Agency (JAEA), Tokai (Japan)

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.

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Research Organization:: Oak Ridge National Laboratory (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 Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration

Grant/Contract Number:: NA0002132; FG52-08NA28552; AC05-00OR22725; FG02-96ER40983; SC0001174; FG02-96ER40955; NA0003897; PHY-1404218; PHY-1068571; PHY-1403906; PHY-1102511; PHY-1419765

OSTI ID:: 1566953

Alternate ID(s):: OSTI ID: 1515592; OSTI ID: 1619203

Journal Information:: Physical Review C, Vol. 99, Issue 5; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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