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Title: ( d , n ) proton-transfer reactions on Be 9 ,   B 11 ,   C 13 ,   N 14 , 15 , and F 19 and spectroscopic factors at E d = 16 MeV

Abstract

The (d,n) reaction has been studied with targets of 9Be, 11B, 13C, 14,15N, and 19F at E d = 16MeV using a deuterated liquid-scintillator array. Advanced spectral unfolding techniques with accurately measured scintillator response functions were employed to extract neutron energy spectra without the need for long-path neutron time-of-flight. An analysis of the proton-transfer data at forward angles to the ground states of the final nuclei, using finite-range distorted-wave Born approximation analysis with common bound-state, global, and local optical-model parameter sets, yields a set of self-consistent spectroscopic factors. These are compared with the results of several previous time-of-flight measurements, most done many years ago for individual nuclei at lower energy and often analyzed using zero-range transfer codes. In contrast to some of the earlier published data, our data generally compare well with simple shell-model predictions, with little evidence for uniform quenching (reduction from shell-model values) that has previously been reported from analysis of nucleon knock-out reactions. Data for low-lying excited states in 14N from 13C(d,n) also is analyzed and spectroscopic information relevant to nuclear astrophysics obtained. Here, a preliminary study of the radioactive ion beam induced reaction 7Be(d,n), E( 7Be) = 30MeV was carried out and indicates further improvements aremore » needed for such measurements, which require detection of neutrons with E n < 2MeV.« less

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [3];  [4];  [5]
  1. Univ. of Michigan, Ann Arbor, MI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States); Harvard Univ., Cambridge, MA (United States)
  4. Univ. of Notre Dame, Notre Dame, IN (United States)
  5. Univ. of Notre Dame, Notre Dame, IN (United States); Technische Univ. Munchen, Garching (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1513421
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Febbraro, Michael T., Becchetti, F. D., Torres-Isea, R. O., Riggins, J., Lawrence, C. C., Kolata, J. J., and Howard, A. M.. (d,n) proton-transfer reactions on Be9, B11, C13, N14,15, and F19 and spectroscopic factors at Ed=16MeV. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.024613.
Febbraro, Michael T., Becchetti, F. D., Torres-Isea, R. O., Riggins, J., Lawrence, C. C., Kolata, J. J., & Howard, A. M.. (d,n) proton-transfer reactions on Be9, B11, C13, N14,15, and F19 and spectroscopic factors at Ed=16MeV. United States. doi:10.1103/PhysRevC.96.024613.
Febbraro, Michael T., Becchetti, F. D., Torres-Isea, R. O., Riggins, J., Lawrence, C. C., Kolata, J. J., and Howard, A. M.. Fri . "(d,n) proton-transfer reactions on Be9, B11, C13, N14,15, and F19 and spectroscopic factors at Ed=16MeV". United States. doi:10.1103/PhysRevC.96.024613. https://www.osti.gov/servlets/purl/1513421.
@article{osti_1513421,
title = {(d,n) proton-transfer reactions on Be9, B11, C13, N14,15, and F19 and spectroscopic factors at Ed=16MeV},
author = {Febbraro, Michael T. and Becchetti, F. D. and Torres-Isea, R. O. and Riggins, J. and Lawrence, C. C. and Kolata, J. J. and Howard, A. M.},
abstractNote = {The (d,n) reaction has been studied with targets of 9Be, 11B, 13C, 14,15N, and 19F at Ed = 16MeV using a deuterated liquid-scintillator array. Advanced spectral unfolding techniques with accurately measured scintillator response functions were employed to extract neutron energy spectra without the need for long-path neutron time-of-flight. An analysis of the proton-transfer data at forward angles to the ground states of the final nuclei, using finite-range distorted-wave Born approximation analysis with common bound-state, global, and local optical-model parameter sets, yields a set of self-consistent spectroscopic factors. These are compared with the results of several previous time-of-flight measurements, most done many years ago for individual nuclei at lower energy and often analyzed using zero-range transfer codes. In contrast to some of the earlier published data, our data generally compare well with simple shell-model predictions, with little evidence for uniform quenching (reduction from shell-model values) that has previously been reported from analysis of nucleon knock-out reactions. Data for low-lying excited states in 14N from 13C(d,n) also is analyzed and spectroscopic information relevant to nuclear astrophysics obtained. Here, a preliminary study of the radioactive ion beam induced reaction 7Be(d,n), E(7Be) = 30MeV was carried out and indicates further improvements are needed for such measurements, which require detection of neutrons with En < 2MeV.},
doi = {10.1103/PhysRevC.96.024613},
journal = {Physical Review C},
issn = {2469-9985},
number = 2,
volume = 96,
place = {United States},
year = {2017},
month = {8}
}

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Works referenced in this record:

Development of organic scintillators
journal, June 1979