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Lowest-energy broad 𝛼-cluster resonances in 19F

Journal Article · · Physical Review. C
 [1];  [2];  [3];  [4];  [2]
  1. Florida State University, Tallahassee, FL (United States); Texas A&M University, College Station, TX (United States)
  2. Texas A&M University, College Station, TX (United States)
  3. Nazarbayev University, Nur-Sultan (Kazakhstan)
  4. Nazarbayev University Research and Innovation System, Nur-Sultan (Kazakhstan); Saint Petersburg State University (Russia)
+ Show Author Affiliations
There is strong astrophysical interest in the structure of 19F states near the α-decay threshold, as their properties are important for understanding the development of α clustering in the 20Ne region. The emergence of clustered states, and more generally of states that couple strongly to reaction channels near their decay thresholds, is also a topic of current interest in theoretical nuclear physics. In this work, we determine the parameters of broad low-spin states in 19F near the α-decay threshold and present a theoretical study of these states. The analysis is restricted to ℓ = 0 and 1 resonances in the α + 15N system close to the α threshold in 19F. Excitation functions for 15N(α,α) elastic scattering were measured using the Thick Target Inverse Kinematics (TTIK) method, and these new data, together with older high–energy-resolution measurements, were analyzed within the R-matrix framework. The nuclear structure of 19F was calculated using configuration-interaction methods with a recently developed effective interaction Hamiltonian. As a result, we identify a sequence of α-cluster resonances in 19F and map the distribution of clustering strength, which is relevant for astrophysical reaction modeling and for the theoretical understanding of many-body dynamics and the emergence of clustering in loosely bound or unstable nuclei. Furthermore, the work advances theoretical insight into the origins of clustering and highlights open questions for future theoretical and experimental studies.
Research Organization:
Florida State University, Tallahassee, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); Ministry of Education and Science of the Republic of Kazakhstan
Grant/Contract Number:
SC0009883; FG02-93ER40773
OSTI ID:
2926098
Alternate ID(s):
OSTI ID: 1979852
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 105; ISSN 2469-9985; ISSN 2469-9993
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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𝛼-cluster structure in 19F and 19Ne in resonant scattering
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Related Subjects

19F
6 ≤ A ≤ 19
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Alpha clustering
Alpha decay
Cluster models
Nuclear forces
Nuclear many-body theory
Resonance reactions
Shell model