Status of the JENSA gas-jet target for experiments with rare isotope beams

Schmidt, K.; Chipps, K. A.; Ahn, Sung‐Hoon; Bardayan, D. W.; Browne, J.; Greife, U.; Meisel, Z.; Montes, F.; O’Malley, P. D.; Ong, Wei Jia; Pain, S. D.; Schatz, H.; Smith, K.; Smith, M. S.; Thompson, P.

doi:10.1016/j.nima.2018.09.052

Cited by 24 publications

(16 citation statements)

References 42 publications

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“…The layout of the SECAR system [3], consisting of a total of 4 sections, is shown in Figure 1. The separator setup begins at the JENSA (Jet Experiments for Nuclear Structure and Astrophysics) chamber [4,5], where the heavy ion beam enters the high density windowless gas jet target. JENSA is a recirculating gas jet target assembly, providing areal densities up to 10 19 atoms/cm 2 of hydrogen or helium isotopes in a 4 -5 mm diameter cylindrical jet.…”

Section: The Secar Layoutmentioning

confidence: 99%

SECAR: A recoil separator for nuclear astrophysics

et al. 2022

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Proton-and alpha-capture reactions on unstable proton-rich nuclei power astrophysical explosions like novae and X-ray bursts. Direct measurements of these reactions are crucial for understanding the mechanisms behind these explosions and the nucleosynthesis at such sites. The recoil mass separator, SECAR (SEparator for CApture Reactions) at the National Superconducting Cyclotron Laboratory (NSCL) and the Facility for Rare Isotope Beams (FRIB), has been designed with the required sensitivity to study (p,γ) and (α,γ) reactions, directly at astrophysical energies in inverse kinematics, with radioactive beams of masses up to about A = 65. The complete SECAR system, including two Wien Filters for high mass resolution, has been installed at Michigan State University and is currently being commissioned. The present article introduces the SECAR concept, its scientific goals, and provides an update of the current status of the project.

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Section: The Secar Layoutmentioning

confidence: 99%

SECAR: A recoil separator for nuclear astrophysics

et al. 2022

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“…In contrast to the direct kinematics case the solid state targets are much more simpler and easier to handle with CH 2 , CD 2 , and LiF being mainly used. On the other hand, gas targets can be very complex and usually relies on supersonic gas jet [63] or cryogenics [64] technology.…”

Section: Inverse Kinematics Studiesmentioning

confidence: 99%

“…Owing to the inverse kinematics of such measurements, the fusion and evaporation between the beam and the target usually induces a large background which must be coped with. Several experimental efforts have been focused on the development of dedicated targets limiting such induced background and energy straggling such as the JENSA windowless supersonic jet gas target [63].…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Transfer Reactions As a Tool in Nuclear Astrophysics

Hammache

Séréville

2021

Front. Phys.

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Nuclear reaction rates are one of the most important ingredients in describing how stars evolve. The study of the nuclear reactions involved in different astrophysical sites is thus mandatory to address most questions in nuclear astrophysics. Direct measurements of the cross-sections at stellar energies are very challenging–if at all possible. This is essentially due to the very low cross-sections of the reactions of interest (especially when it involves charged particles), and/or to the radioactive nature of many key nuclei. In order to overcome these difficulties, various indirect methods such as the transfer reaction method at energies above or near the Coulomb barrier are used to measure the spectroscopic properties of the involved compound nucleus that are needed to calculate cross-sections or reaction rates of astrophysical interest. In this review, the basic features of the transfer reaction method and the theoretical concept behind are first discussed, then the method is illustrated with recent performed experimental studies of key reactions in nuclear astrophysics.

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“…Radiative capture reactions on short-lived nuclides tend to have low yields and high 𝛾-backgrounds, which favors the use of recoil separators (Ruiz et al 2014). For the purposes of our estimates below, we will consider hypothetical future measurements using the JENSA gas-jet target (Schmidt et al 2018) coupled to the SECAR recoil separator at the upcoming Facility for Rare Isotope Beams (FRIB) (Berg et al 2018), as this will likely be the first set-up where direct measurements of 𝑟 𝑝-process reactions in the astrophysical energy window will be possible. However, we provide all relevant experimental details such that our estimates could be applied to other facilities as they come online in the future, e.g.…”

Section: Implications For Nuclear Physics Studiesmentioning

confidence: 99%

Urca Nuclide Production in Type-I X-ray Bursts and Implications for Nuclear Physics Studies

Merz,

Meisel

2020

Preprint

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The thermal structure of accreting neutron stars is affected by the presence of urca nuclei in the neutron star crust. Nuclear isobars harboring urca nuclides can be produced in the ashes of Type I X-ray bursts, but the details of their production have not yet been explored. Using the code MESA, we investigate urca nuclide production in a one-dimensional model of Type I X-ray bursts using astrophysical conditions thought to resemble the source GS 1826-24. We find that high-mass (𝐴 ≥ 55) urca nuclei are primarily produced late in the X-ray burst, during hydrogen-burning freeze-out that corresponds to the tail of the burst light curve. The ∼ 0.4-0.6 GK temperature relevant for nucleosynthesis of these urca nuclides is much lower than the ∼ 1 GK temperature most relevant for X-ray burst light curve impacts by nuclear reaction rates involving high-mass nuclides. The latter temperature is often assumed for nuclear physics studies. Therefore, our findings alter the excitation energy range of interest in compound nuclei for nuclear physics studies of urca nuclide production. We demonstrate that for some cases this will need to be considered in planning for nuclear physics experiments. Additionally, we show that the lower temperature range for urca nuclide production explains why variations of some nuclear reaction rates in model calculations impacts the burst light curve but not local features of the burst ashes.

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Status of the JENSA gas-jet target for experiments with rare isotope beams

Cited by 24 publications

References 42 publications

SECAR: A recoil separator for nuclear astrophysics

SECAR: A recoil separator for nuclear astrophysics

Transfer Reactions As a Tool in Nuclear Astrophysics

Urca Nuclide Production in Type-I X-ray Bursts and Implications for Nuclear Physics Studies

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