Searching for states analogous to the C12 Hoyle state in heavier nuclei using the thick target inverse kinematics technique

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.

doi:10.1103/PhysRevC.98.044601

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

Journal Article · Tue Oct 02 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.98.044601· OSTI ID:1491997

Barbui, M. ^[1]; Hagel, K. ^[1]; Gauthier, J. ^[1]; Wuenschel, S. ^[1]; Wada, R. ^[1]; Goldberg, V. Z. ^[1]; deSouza, R. T. ^[2]; Hudan, S. ^[2]; Fang, D. ^[3]; Cao, X. -G. ^[4]; Natowitz, J. B. ^[1]

Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
Indiana Univ., Bloomington, IN (United States)
Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Applied Physics (SINAP)
Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.; Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Applied Physics (SINAP)

Identification of α-cluster states analogous to the ${}_{12}C$ Hoyle state in heavier α-conjugate nuclei can provide tests of the existence of α condensates in nuclei. Such states are predicted for ${}_{16}O$ , ${}_{20}{Ne}$ , ${}_{24}{Mg}$ , ${}_{28}{Si}$ , 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 ${}_{20}{Ne} + α$ was studied using a ${}_{20}{Ne}$ 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 ${}_{12}C$ 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 ${}_{16}O$ of a state analogous to the ${}_{12}C$ Hoyle state. Moreover, the reconstructed excitation energy of ${}_{24}{Mg}$ for these events peaks at around 34 MeV, very close to the predicted excitation energy for an excited state analogous to the ${}_{12}C$ Hoyle state in ${}_{24}{Mg}$ . 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.

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Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Robert A. Welch Foundation (United States)

Grant/Contract Number:: FG02-93ER40773; A0330; FG03- 93ER40773

OSTI ID:: 1491997

Alternate ID(s):: OSTI ID: 1546138

Journal Information:: Physical Review C, Vol. 98, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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