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Title: K 38 isomer production via fast fragmentation

Abstract

In radioactive ion beam experiments, beams containing isomers can be of interest in probing nuclear structure and informing astrophysical reaction rates. While the production of mixed in-flight ground state and isomer beams using nucleon transfer can be generally understood through distorted wave Born approximation methodology, low-spin isomer production via fast fragmentation is relatively unstudied. To attain a practical understanding of low-spin isomer production using fast fragmentation beams, a test case of 38K/ 38mK was studied at the National Superconducting Cyclotron Laboratory’s ReAccelerated Beam facility. Starting from lise++ predictions, the fragmentation momentum distribution was sampled to determine isomer production. In addition, the effects of the gas stopper gradient and charge breeding times were examined. In the case of 38K, isomer production peaks at ~57%. This maximum is observed just off the lise++ predicted optimum magnetic rigidity, with only small losses in beam intensity within a few percent of this optimum rigidity setting. Control of the isomer fraction was also achieved through the modification of charge breeding times. Furthermore, fast fragmentation appears to be a feasible method for production of low-spin isomeric beams, but additional study is necessary to better describe the mechanism involved.

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [3];  [3];  [3];  [3];  [4];  [5];  [4];  [4]; ORCiD logo [1];  [6]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Tennessee Technological Univ., Cookeville, TN (United States)
  3. National Superconducting Cyclotron Laboratory, East Lansing, MI (United States)
  4. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Laboratory, East Lansing, MI (United States)
  5. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Laboratory, East Lansing, MI (United States); Chinese Academy of Science, Lanzhou (China)
  6. Univ. of Notre Dame, Notre Dame, IN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1484824
Alternate Identifier(s):
OSTI ID: 1489582
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 21; Journal Issue: 12; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Chipps, Kelly A., Kozub, R. L., Sumithrarachchi, C., Ginter, T., Baumann, T., Lund, K., Lapierre, A., Villari, A., Montes, F., Jin, S., Schmidt, K., Ayoub, S., Pain, Steven D., and Blankstein, D. K38 isomer production via fast fragmentation. United States: N. p., 2018. Web. doi:10.1103/PhysRevAccelBeams.21.121301.
Chipps, Kelly A., Kozub, R. L., Sumithrarachchi, C., Ginter, T., Baumann, T., Lund, K., Lapierre, A., Villari, A., Montes, F., Jin, S., Schmidt, K., Ayoub, S., Pain, Steven D., & Blankstein, D. K38 isomer production via fast fragmentation. United States. doi:10.1103/PhysRevAccelBeams.21.121301.
Chipps, Kelly A., Kozub, R. L., Sumithrarachchi, C., Ginter, T., Baumann, T., Lund, K., Lapierre, A., Villari, A., Montes, F., Jin, S., Schmidt, K., Ayoub, S., Pain, Steven D., and Blankstein, D. Thu . "K38 isomer production via fast fragmentation". United States. doi:10.1103/PhysRevAccelBeams.21.121301.
@article{osti_1484824,
title = {K38 isomer production via fast fragmentation},
author = {Chipps, Kelly A. and Kozub, R. L. and Sumithrarachchi, C. and Ginter, T. and Baumann, T. and Lund, K. and Lapierre, A. and Villari, A. and Montes, F. and Jin, S. and Schmidt, K. and Ayoub, S. and Pain, Steven D. and Blankstein, D.},
abstractNote = {In radioactive ion beam experiments, beams containing isomers can be of interest in probing nuclear structure and informing astrophysical reaction rates. While the production of mixed in-flight ground state and isomer beams using nucleon transfer can be generally understood through distorted wave Born approximation methodology, low-spin isomer production via fast fragmentation is relatively unstudied. To attain a practical understanding of low-spin isomer production using fast fragmentation beams, a test case of 38K/38mK was studied at the National Superconducting Cyclotron Laboratory’s ReAccelerated Beam facility. Starting from lise++ predictions, the fragmentation momentum distribution was sampled to determine isomer production. In addition, the effects of the gas stopper gradient and charge breeding times were examined. In the case of 38K, isomer production peaks at ~57%. This maximum is observed just off the lise++ predicted optimum magnetic rigidity, with only small losses in beam intensity within a few percent of this optimum rigidity setting. Control of the isomer fraction was also achieved through the modification of charge breeding times. Furthermore, fast fragmentation appears to be a feasible method for production of low-spin isomeric beams, but additional study is necessary to better describe the mechanism involved.},
doi = {10.1103/PhysRevAccelBeams.21.121301},
journal = {Physical Review Accelerators and Beams},
number = 12,
volume = 21,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.21.121301

Figures / Tables:

FIG. 1 FIG. 1: Schematic layout of the in-flight beam production and beam stopping and charge breeding portions of the National Superconducting Cyclotron Laboratory, from the exit of the A1900 to the exit of the EBIT, with relevant devices labeled. The detectors used in this study were located at these three locations.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.