Cluster structure of 3α + p states in 13N

J. Bishop; G. V. Rogachev; S. Ahn; M. Barbui; S. M. Cha; E. Harris; C. Hunt; C. H. Kim; D. Kim; S. H. Kim; E. Koshchiy; Z. Luo; C. Park; C. E. Parker; E. C. Pollacco; B. T. Roeder; M. Roosa; A. Saastamoinen; D. P. Scriven

doi:10.1103/PhysRevC.109.054308

Cluster structure of 3α + p states in ¹³N

J. Bishop
, G. V. Rogachev
, S. Ahn
, M. Barbui
, S. M. Cha
, E. Harris
, C. Hunt
, C. H. Kim
, D. Kim
, S. H. Kim
, E. Koshchiy
, Z. Luo
, C. Park
, C. E. Parker
, E. C. Pollacco
, B. T. Roeder
, M. Roosa
, A. Saastamoinen
, D. P. Scriven

Physics and Astronomy

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

48 Downloads (Pure)

Abstract

Background: Cluster states in ¹³N are extremely difficult to measure due to the unavailability of ⁹B +𝛼 elastic-scattering data.

Purpose: Using 𝛽-delayed charged-particle spectroscopy of ¹³O, clustered states in ¹³N can be populated and measured in the 3⁢𝛼+𝑝 decay channel.

Methods: One-at-a-time implantation and decay of ¹³O was performed with the Texas Active Target Time Projection Chamber. 149⁢𝛽⁢3⁢𝛼⁢𝑝 decay events were observed and the excitation function in ¹³N reconstructed.

Results: Four previously unknown 𝛼-decaying excited states were observed in ¹³N at an excitation energy of 11.3, 12.4, 13.1, and 13.7 MeV decaying via the 3⁢𝛼+𝑝 channel.

Conclusions: These states are seen to have a [⁹B⁡(g.s)⁢⨂𝛼/𝑝+ 12 C ⁡(0⁺₂)], [⁹B⁡(½⁺)⁢⨂𝛼], [⁹B⁡(⁵⁄₂⁺)⁢⨂𝛼], and [⁹B⁡(⁵⁄₂⁺)⁢⨂𝛼] structure, respectively. A previously seen state at 11.8 MeV was also determined to have a [𝑝+ ¹² C ⁡(g.s.)/𝑝+ ¹²C ⁡(0⁺₂₎] structure. The overall magnitude of the clustering is not able to be extracted, however, due to the lack of a total width measurement. Clustered states in¹³N (with unknown magnitude) seem to persist from the addition of a proton to the highly 𝛼-clustered ¹²C . Evidence of the ½⁺ state in ⁹B was also seen to be populated by decays from ¹³N^★.

Original language	English
Article number	054308
Number of pages	10
Journal	Physical Review C
Volume	109
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.109.054308
Publication status	Published - 8 May 2024

Access to Document

10.1103/PhysRevC.109.054308Licence: Creative Commons: Attribution (CC BY)

BishopJ2024ClusterFinal published version, 910 KBLicence: Creative Commons: Attribution (CC BY)

Cite this

Bishop, J., Rogachev, G. V., Ahn, S., Barbui, M., Cha, S. M., Harris, E., Hunt, C., Kim, C. H., Kim, D., Kim, S. H., Koshchiy, E., Luo, Z., Park, C., Parker, C. E., Pollacco, E. C., Roeder, B. T., Roosa, M., Saastamoinen, A., & Scriven, D. P. (2024). Cluster structure of 3α + p states in ¹³N. Physical Review C, 109(5), Article 054308. https://doi.org/10.1103/PhysRevC.109.054308

@article{4995f430568b43bba95d9419de6f2807,

title = "Cluster structure of 3α + p states in 13N",

abstract = "Background: Cluster states in 13N are extremely difficult to measure due to the unavailability of 9B +𝛼 elastic-scattering data. Purpose: Using 𝛽-delayed charged-particle spectroscopy of 13O, clustered states in 13N can be populated and measured in the 3⁢𝛼+𝑝 decay channel. Methods: One-at-a-time implantation and decay of 13O was performed with the Texas Active Target Time Projection Chamber. 149⁢𝛽⁢3⁢𝛼⁢𝑝 decay events were observed and the excitation function in 13N reconstructed. Results: Four previously unknown 𝛼-decaying excited states were observed in 13N at an excitation energy of 11.3, 12.4, 13.1, and 13.7 MeV decaying via the 3⁢𝛼+𝑝 channel. Conclusions: These states are seen to have a [9B⁡(g.s)⁢⨂𝛼/𝑝+ 12 C ⁡(0+2)], [9B⁡(½+)⁢⨂𝛼], [9B⁡(⁵⁄₂+)⁢⨂𝛼], and [9B⁡(⁵⁄₂+)⁢⨂𝛼] structure, respectively. A previously seen state at 11.8 MeV was also determined to have a [𝑝+ 12 C ⁡(g.s.)/𝑝+ 12C ⁡(0+2)] structure. The overall magnitude of the clustering is not able to be extracted, however, due to the lack of a total width measurement. Clustered states in 13N (with unknown magnitude) seem to persist from the addition of a proton to the highly 𝛼-clustered 12C . Evidence of the ½+ state in 9B was also seen to be populated by decays from 13N★.",

author = "J. Bishop and Rogachev, \{G. V.\} and S. Ahn and M. Barbui and Cha, \{S. M.\} and E. Harris and C. Hunt and Kim, \{C. H.\} and D. Kim and Kim, \{S. H.\} and E. Koshchiy and Z. Luo and C. Park and Parker, \{C. E.\} and Pollacco, \{E. C.\} and Roeder, \{B. T.\} and M. Roosa and A. Saastamoinen and Scriven, \{D. P.\}",

year = "2024",

month = may,

day = "8",

doi = "10.1103/PhysRevC.109.054308",

language = "English",

volume = "109",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society (APS)",

number = "5",

}

TY - JOUR

T1 - Cluster structure of 3α + p states in 13N

AU - Bishop, J.

AU - Rogachev, G. V.

AU - Ahn, S.

AU - Barbui, M.

AU - Cha, S. M.

AU - Harris, E.

AU - Hunt, C.

AU - Kim, C. H.

AU - Kim, D.

AU - Kim, S. H.

AU - Koshchiy, E.

AU - Luo, Z.

AU - Park, C.

AU - Parker, C. E.

AU - Pollacco, E. C.

AU - Roeder, B. T.

AU - Roosa, M.

AU - Saastamoinen, A.

AU - Scriven, D. P.

PY - 2024/5/8

Y1 - 2024/5/8

N2 - Background: Cluster states in 13N are extremely difficult to measure due to the unavailability of 9B +𝛼 elastic-scattering data. Purpose: Using 𝛽-delayed charged-particle spectroscopy of 13O, clustered states in 13N can be populated and measured in the 3⁢𝛼+𝑝 decay channel. Methods: One-at-a-time implantation and decay of 13O was performed with the Texas Active Target Time Projection Chamber. 149⁢𝛽⁢3⁢𝛼⁢𝑝 decay events were observed and the excitation function in 13N reconstructed. Results: Four previously unknown 𝛼-decaying excited states were observed in 13N at an excitation energy of 11.3, 12.4, 13.1, and 13.7 MeV decaying via the 3⁢𝛼+𝑝 channel. Conclusions: These states are seen to have a [9B⁡(g.s)⁢⨂𝛼/𝑝+ 12 C ⁡(0+2)], [9B⁡(½+)⁢⨂𝛼], [9B⁡(⁵⁄₂+)⁢⨂𝛼], and [9B⁡(⁵⁄₂+)⁢⨂𝛼] structure, respectively. A previously seen state at 11.8 MeV was also determined to have a [𝑝+ 12 C ⁡(g.s.)/𝑝+ 12C ⁡(0+2)] structure. The overall magnitude of the clustering is not able to be extracted, however, due to the lack of a total width measurement. Clustered states in 13N (with unknown magnitude) seem to persist from the addition of a proton to the highly 𝛼-clustered 12C . Evidence of the ½+ state in 9B was also seen to be populated by decays from 13N★.

AB - Background: Cluster states in 13N are extremely difficult to measure due to the unavailability of 9B +𝛼 elastic-scattering data. Purpose: Using 𝛽-delayed charged-particle spectroscopy of 13O, clustered states in 13N can be populated and measured in the 3⁢𝛼+𝑝 decay channel. Methods: One-at-a-time implantation and decay of 13O was performed with the Texas Active Target Time Projection Chamber. 149⁢𝛽⁢3⁢𝛼⁢𝑝 decay events were observed and the excitation function in 13N reconstructed. Results: Four previously unknown 𝛼-decaying excited states were observed in 13N at an excitation energy of 11.3, 12.4, 13.1, and 13.7 MeV decaying via the 3⁢𝛼+𝑝 channel. Conclusions: These states are seen to have a [9B⁡(g.s)⁢⨂𝛼/𝑝+ 12 C ⁡(0+2)], [9B⁡(½+)⁢⨂𝛼], [9B⁡(⁵⁄₂+)⁢⨂𝛼], and [9B⁡(⁵⁄₂+)⁢⨂𝛼] structure, respectively. A previously seen state at 11.8 MeV was also determined to have a [𝑝+ 12 C ⁡(g.s.)/𝑝+ 12C ⁡(0+2)] structure. The overall magnitude of the clustering is not able to be extracted, however, due to the lack of a total width measurement. Clustered states in 13N (with unknown magnitude) seem to persist from the addition of a proton to the highly 𝛼-clustered 12C . Evidence of the ½+ state in 9B was also seen to be populated by decays from 13N★.

U2 - 10.1103/PhysRevC.109.054308

DO - 10.1103/PhysRevC.109.054308

M3 - Article

SN - 0556-2813

VL - 109

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 054308

ER -

Cluster structure of 3α + p states in 13N

Abstract

Access to Document

Fingerprint

Cite this

Cluster structure of 3α + p states in ¹³N