Spectroscopy of 13Be through isobaric analog states in 13B

Hunt, C.; Ahn, S.; Bishop, J.; Koshchiy, E.; Aboud, E.; Alcorta, M.; Bosh, A.; Hahn, K.; Han, S.; Parker, C. E.; Pollacco, E. C.; Roeder, B. T.; Roosa, M.; Upadhyayula, S.; Volya, A. S.; Rogachev, G. V.

doi:10.1103/physrevc.108.l051606

Title: Spectroscopy of ¹³Be through isobaric analog states in ¹³B

Journal Article · 20 November 2023 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.108.l051606 · OSTI ID:2329282

Hunt, C. ^[1];

^[2];

^[3];

^[4]; Alcorta, M. ^[5]; Bosh, A. ^[6]; Hahn, K. ^[7]; Han, S. ^[8]; Parker, C. E. ^[3];

^[9]; Roeder, B. T. ^[3];

^[6]; Upadhyayula, S. ^[10];

^[11];

^[12]

Texas A & M Univ., College Station, TX (United States); Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.; Michigan State Univ., East Lansing, MI (United States). Facility for Rare Isotope Beams; Texas A&M University Cyclotron Institute
Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.; Institute for Basic Science, Daejeon (South Korea). Center for Exotic Nuclear Studies
Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
Texas A & M Univ., College Station, TX (United States); Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
TRIUMF, Vancouver, BC (Canada)
Texas A & M Univ., College Station, TX (United States); Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
Ewha Womans University, Seoul (South Korea); Univ. Paris-Saclay, Gif-sur-Yvette (France). CEA, IRFU
Ewha Womans University, Seoul (South Korea)
Univ. Paris-Saclay, Gif-sur-Yvette (France). CEA, IRFU
Texas A & M Univ., College Station, TX (United States); Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.; TRIUMF, Vancouver, BC (Canada)
Florida State Univ., Tallahassee, FL (United States)
Texas A & M Univ., College Station, TX (United States); Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.; Texas A & M Univ., College Station, TX (United States). Nuclear Solutions Inst.

Background: Spectroscopy of the exotic, neutron unbound beryllium isotope, ¹³Be, is still a puzzle despite significant experimental effort. Purpose: To observe T = 5/2 states in ¹³B, establish spin parities and spectroscopic factors and use isospin symmetry to inform spectroscopy of 13Be. Methods: Excitation functions for resonance elastic scattering of ¹²Be on protons was measured in the c.m. energy range from 1 MeV to 5 MeV. Results: Two T = 5/2 states in 13B at excitation energies 18.25 MeV and 19.95 MeV were observed. Unambiguous 1/2⁺ and 5/2⁺ spin-parity assignments were made and spectroscopic factors established using the R-matrix analysis of the measured ¹²Be+p excitation functions. Conclusions: We provide the first direct and unambiguous spin-parity assignments and spectroscopic factors measurements for the resonances in A = 13, T = 5/2 isobaric multiplet. This puts us on a solid footing to identify the 2.3 MeV state in ¹³Be as 5/2⁺ and infer existence of an s-wave (1/2⁺) resonance at around 0.5 MeV with relatively small spectroscopic factor.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-93ER40773; SC0009883; NA0003841

OSTI ID:: 2329282

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 108; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Spectroscopy of ¹³Be through isobaric analog states in ¹³B