Study of the Pygmy Dipole Resonance via ($d,p$) reactions

Journal Article · 16 January 2024 · Il Nuovo Cimento C

DOI: https://doi.org/10.1393/ncc/i2024-24020-5 · OSTI ID:2480913

Spieker, M. ^[1]

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1. Florida State University, Tallahassee, FL (United States)

The low-lying E1 strength below, around, and partially above the neutron-separation threshold, S_n, is often referred to as Pygmy Dipole Resonance (PDR). At the moment, it is not clear whether the PDR is a collective excitation mode and whether it is a general feature of the γ-ray strength function, which needs to be answered to reliably calculate capture rates for nucleosynthesis processes when using statistical Hauser-Feshbach approaches. To further understand the microscopic origin of the PDR and possible cancellation effects between isovector E1 matrix elements, which appear to be strongly model-dependant, an experimental program studying the neutron one-particle-one-hole (1p-1h) structure of the PDR via (d, p) and (d, pγ) reactions was started. Some results of the already published work will be discussed and additional remarks, including future plans, are made.

• Research Organization: Texas A&M University Cyclotron Institute, College Station, TX (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE
• Grant/Contract Number: NA0003841
• OSTI ID: 2480913
• Journal Information: Il Nuovo Cimento C, Journal Name: Il Nuovo Cimento C Journal Issue: 2; ISSN 2037-4909
• Publisher: Societa italiana di fisica (Italian Physical Society)Copyright Statement
• Country of Publication: United States
• Language: English