Spectroscopy of 13Be through isobaric analog states in 13B

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

doi:10.1103/PhysRevC.108.L051606

Spectroscopy of ¹³Be through isobaric analog states in ¹³B

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

Physics and Astronomy

Research output: Contribution to journal › Letter › peer-review

Abstract

Background: Spectroscopy of the exotic, neutron unbound beryllium isotope ¹³Be is still a puzzle despite significant experimental efforts.

Purpose: We aim 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 12 Be on protons were measured in the center-of-mass energy range from 1 to 5 MeV.

Results: Two 𝑇=5/2 states in ¹³B at excitation energies 18.25 and 19.95 MeV were observed. Unambiguous 1/2⁺ and 5/2⁺ spin-parity assignments were made, and spectroscopic factors were 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 factor measurements for the resonances in the 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 the existence of an 𝑠-wave (1/2⁺) resonance at around 0.6 MeV with relatively small spectroscopic factor.

Original language	English
Article number	L051606
Number of pages	6
Journal	Physical Review C
Volume	108
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.108.L051606
Publication status	Published - 20 Nov 2023

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10.1103/PhysRevC.108.L051606

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@article{27cf5953ba9d4ecc8678c4f216071931,

title = "Spectroscopy of 13Be through isobaric analog states in 13B",

abstract = "Background: Spectroscopy of the exotic, neutron unbound beryllium isotope 13Be is still a puzzle despite significant experimental efforts.Purpose: We aim 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 12 Be on protons were measured in the center-of-mass energy range from 1 to 5 MeV.Results: Two 𝑇=5/2 states in 13B at excitation energies 18.25 and 19.95 MeV were observed. Unambiguous 1/2+ and 5/2+ spin-parity assignments were made, and spectroscopic factors were 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 factor measurements for the resonances in the 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 the existence of an 𝑠-wave (1/2+) resonance at around 0.6 MeV with relatively small spectroscopic factor.",

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

year = "2023",

month = nov,

day = "20",

doi = "10.1103/PhysRevC.108.L051606",

language = "English",

volume = "108",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society (APS)",

number = "5",

}

TY - JOUR

T1 - Spectroscopy of 13Be through isobaric analog states in 13B

AU - Hunt, C.

AU - Ahn, S.

AU - Bishop, J.

AU - Koshchiy, E.

AU - Aboud, E.

AU - Alcorta, M.

AU - Bosh, A.

AU - Hahn, K.

AU - Han, S.

AU - Parker, C. E.

AU - Pollacco, E. C.

AU - Roeder, B. T.

AU - Roosa, M.

AU - Upadhyayula, S.

AU - Volya, A. S.

AU - Rogachev, G. V.

PY - 2023/11/20

Y1 - 2023/11/20

N2 - Background: Spectroscopy of the exotic, neutron unbound beryllium isotope 13Be is still a puzzle despite significant experimental efforts.Purpose: We aim 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 12 Be on protons were measured in the center-of-mass energy range from 1 to 5 MeV.Results: Two 𝑇=5/2 states in 13B at excitation energies 18.25 and 19.95 MeV were observed. Unambiguous 1/2+ and 5/2+ spin-parity assignments were made, and spectroscopic factors were 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 factor measurements for the resonances in the 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 the existence of an 𝑠-wave (1/2+) resonance at around 0.6 MeV with relatively small spectroscopic factor.

AB - Background: Spectroscopy of the exotic, neutron unbound beryllium isotope 13Be is still a puzzle despite significant experimental efforts.Purpose: We aim 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 12 Be on protons were measured in the center-of-mass energy range from 1 to 5 MeV.Results: Two 𝑇=5/2 states in 13B at excitation energies 18.25 and 19.95 MeV were observed. Unambiguous 1/2+ and 5/2+ spin-parity assignments were made, and spectroscopic factors were 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 factor measurements for the resonances in the 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 the existence of an 𝑠-wave (1/2+) resonance at around 0.6 MeV with relatively small spectroscopic factor.

U2 - 10.1103/PhysRevC.108.L051606

DO - 10.1103/PhysRevC.108.L051606

M3 - Letter

SN - 0556-2813

VL - 108

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - L051606

ER -

Spectroscopy of 13Be through isobaric analog states in 13B

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Spectroscopy of ¹³Be through isobaric analog states in ¹³B