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Title: Searching for states analogous to the C 12 Hoyle state in heavier nuclei using the thick target inverse kinematics technique

Abstract

Identification of α-cluster states analogous to the C 12 Hoyle state in heavier α-conjugate nuclei can provide tests of the existence of α condensates in nuclei. Such states are predicted for O 16 , Ne 20 , Mg 24 , Si 28 , etc., at excitation energies slightly above the multi- α-particle decay threshold but have not yet been experimentally identified. The thick target inverse kinematics (TTIK) technique can be used to study the breakup of excited self-conjugate nuclei into many α particles. The reaction Ne 20 + α was studied using a Ne 20 beam at 12 MeV/nucleon from the K150 cyclotron at Texas A&M University. The TTIK method was used to study both single α-particle emission and multiple α-particle decays. Events with α multiplicity up to four were analyzed. The analysis of the three α-particle emission data allowed the identification of the Hoyle state and other C 12 excited states decaying into three α particles. The results are shown and compared with other data available in the literature. Although the statistics for events with α-multiplicity four is low, the data show a structure at about 15.2 MeV that could indicate the existence in O 16 of a state analogous to the C 12 Hoyle state. Moreover, the reconstructed excitation energy of Mg 24 for these events peaks at around 34 MeV, very close to the predicted excitation energy for an excited state analogous to the C 12 Hoyle state in Mg 24 . The structure is further confirmed by the reanalysis of α-multiplicity-four events from a previous experiment performed at 9.7 MeV/nucleon with a similar, but lower granularity, experimental setup.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [4];  [1]
  1. Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
  2. Indiana Univ., Bloomington, IN (United States)
  3. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Applied Physics (SINAP)
  4. Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.; Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Applied Physics (SINAP)
Publication Date:
Research Org.:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Robert A. Welch Foundation (United States)
OSTI Identifier:
1491997
Alternate Identifier(s):
OSTI ID: 1546138
Grant/Contract Number:  
FG02-93ER40773; A0330; FG03- 93ER40773
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; collective levels; nuclear reactions; nuclear structure & decays

Citation Formats

Barbui, M., Hagel, K., Gauthier, J., Wuenschel, S., Wada, R., Goldberg, V. Z., deSouza, R. T., Hudan, S., Fang, D., Cao, X. -G., and Natowitz, J. B. Searching for states analogous to the C12 Hoyle state in heavier nuclei using the thick target inverse kinematics technique. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.98.044601.
Barbui, M., Hagel, K., Gauthier, J., Wuenschel, S., Wada, R., Goldberg, V. Z., deSouza, R. T., Hudan, S., Fang, D., Cao, X. -G., & Natowitz, J. B. Searching for states analogous to the C12 Hoyle state in heavier nuclei using the thick target inverse kinematics technique. United States. doi:10.1103/PhysRevC.98.044601.
Barbui, M., Hagel, K., Gauthier, J., Wuenschel, S., Wada, R., Goldberg, V. Z., deSouza, R. T., Hudan, S., Fang, D., Cao, X. -G., and Natowitz, J. B. Tue . "Searching for states analogous to the C12 Hoyle state in heavier nuclei using the thick target inverse kinematics technique". United States. doi:10.1103/PhysRevC.98.044601. https://www.osti.gov/servlets/purl/1491997.
@article{osti_1491997,
title = {Searching for states analogous to the C12 Hoyle state in heavier nuclei using the thick target inverse kinematics technique},
author = {Barbui, M. and Hagel, K. and Gauthier, J. and Wuenschel, S. and Wada, R. and Goldberg, V. Z. and deSouza, R. T. and Hudan, S. and Fang, D. and Cao, X. -G. and Natowitz, J. B.},
abstractNote = {Identification of α-cluster states analogous to the C12 Hoyle state in heavier α-conjugate nuclei can provide tests of the existence of α condensates in nuclei. Such states are predicted for O16, Ne20, Mg24, Si28, etc., at excitation energies slightly above the multi- α-particle decay threshold but have not yet been experimentally identified. The thick target inverse kinematics (TTIK) technique can be used to study the breakup of excited self-conjugate nuclei into many α particles. The reaction Ne20+α was studied using a Ne20 beam at 12 MeV/nucleon from the K150 cyclotron at Texas A&M University. The TTIK method was used to study both single α-particle emission and multiple α-particle decays. Events with α multiplicity up to four were analyzed. The analysis of the three α-particle emission data allowed the identification of the Hoyle state and other C12 excited states decaying into three α particles. The results are shown and compared with other data available in the literature. Although the statistics for events with α-multiplicity four is low, the data show a structure at about 15.2 MeV that could indicate the existence in O16 of a state analogous to the C12 Hoyle state. Moreover, the reconstructed excitation energy of Mg24 for these events peaks at around 34 MeV, very close to the predicted excitation energy for an excited state analogous to the C12 Hoyle state in Mg24. The structure is further confirmed by the reanalysis of α-multiplicity-four events from a previous experiment performed at 9.7 MeV/nucleon with a similar, but lower granularity, experimental setup.},
doi = {10.1103/PhysRevC.98.044601},
journal = {Physical Review C},
number = 4,
volume = 98,
place = {United States},
year = {2018},
month = {10}
}

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