3He +𝛼 resonances in 7Be

Charity, R. J.; Sobotka, L. G.

doi:10.1103/lwmk-r1jz

³He +𝛼 resonances in ⁷Be

Journal Article · Fri Oct 24 00:00:00 EDT 2025 · Physical Review C

DOI:https://doi.org/10.1103/lwmk-r1jz· OSTI ID:2999824

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Washington Univ., St. Louis, MO (United States)

Resonances in ⁷Be which decay into the ³He+α exit channel have been measured with improved precision using preexisting data sets. The energy and width of the J^π=7/2^-state have been extracted from an invariant-mass study of projectile-breakup products originating from interactions of an E/A=10.7-MeV ¹⁰C beam on Be and C targets. The excitation energy of this state (from the pole of the S-matrix) is determined to be E*=4.545(6)~MeV, a factor of 8 improvement in precision as compared to the ENSDF value. This improvement is enabled by fine tuning the detector calibrations using calibration resonances in ⁶Li, ⁷Li, ⁶Be, ⁹B, and ¹²C whose decay energies are known to high precision. The J^π=7/2- resonance in ⁷Be can now itself be used as a calibration resonance in invariant-mass experiments. This utility is particularly helpful for ³He energy calibrations of CsI(Tl) detectors which are often used in detector arrays employed for measurements with fast beams. This utility is demonstrated with a data set associated with E/A=70 MeV ⁷Be beams which are inelastically excited to the 7/2^- and 5/2^-₁ resonances. Again using the pole of the S-matrix as the definition of the resonance parameters, the fitted excitation energy of the 5/2^-₁ resonance is 6.376(17) MeV, approximately 300 keV lower than the ENSDF value. Finally, its width of 565(4) keV is roughly half of the ENSDF value.

View Accepted Manuscript (DOE)

Research Organization:: Washington Univ., St. Louis, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-87ER40316

OSTI ID:: 2999824

Alternate ID(s):: OSTI ID: 3000769

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 112; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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