Development of a cryogenic gas target system for intense radioisotope beam production at CRIB

Yamaguchi, Hideyo; Wakabayashi, Y.; Amádio, G.; Hayakawa, S.; Fujikawa, Hirohisa; Kubono, S.; He, Jiajia; Kim, A.; Binh, D. N.

doi:10.1016/j.nima.2008.02.013

Cited by 65 publications

(21 citation statements)

References 9 publications

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“…A 28 Si 9+ primary beam was extracted from an electron cycltron resonance ion source and accelerated to 7.3 MeV/u by the RIKEN AVF cyclotron (K ≈ 70) with a typical intensity of 80 pnA. We impinged the 28 Si beam on the production target located at the entrance focal plane to CRIB, comprised of a windowed, cryogenic gas cell [50]. 3 He gas at 400 Torr was cooled to an effective temperature of 90 K with LN 2 ; the gas was confined by 2.5-µm Havar windows in a cylindrical chamber with a length of 80 mm and a diameter of 20 mm, yielding a 3 He target thickness of approximately 1.7 mg cm −2 .…”

Section: Methodsmentioning

confidence: 99%

First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
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0
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Background: Type I x-ray bursts are the most frequently observed thermonuclear explosions in the galaxy, resulting from thermonuclear runaway on the surface of an accreting neutron star. The 30 S(α, p) reaction plays a critical role in burst models, yet insufficient experimental information is available to calculate a reliable, precise rate for this reaction.Purpose: Our measurement was conducted to search for states in 34 Ar and determine their quantum properties. In particular, natural-parity states with large α-decay partial widths should dominate the stellar reaction rate.Method: We performed the first measurement of 30 S+α resonant elastic scattering up to a center-of-mass energy of 5.5 MeV using a radioactive ion beam. The experiment utilized a thick gaseous active target system and silicon detector array in inverse kinematics. Results:We obtained an excitation function for 30 S(α, α) near 150• in the center-of-mass frame. The experimental data were analyzed with R-Matrix calculations, and we observed three new resonant patterns between 11.1 and 12.1 MeV, extracting their properties of resonance energy, widths, spin, and parity. Conclusions:We calculated the resonant thermonuclear reaction rate of 30 S(α, p) based on all available experimental data of 34 Ar and found an upper limit about one order of magnitude larger than a rate determined using a statistical model. The astrophysical impact of these two rates has been investigated through one-zone postprocessing type I x-ray burst calculations. We find that our new upper limit for the 30 S(α, p) 33 Cl rate significantly affects the predicted nuclear energy generation rate during the burst.

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Section: Methodsmentioning

confidence: 99%

First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
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14
0
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0
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“…The radioactive 30 S beam was produced in-flight via the 3 He( 28 Si, 30 S)n reaction using the Center for Nuclear Study (CNS) low-energy radioactive ion beam separator (CRIB) [10,11], where we bombarded a cryogenically-cooled gas cell [12] of 3 He at 1.72 mg · cm −2 with a 28 Si beam at 7.3 MeV/u [13]. The 30 S beam arrived on target at 1.6 MeV/u, an average of 30% purity, and with an intensity of 10 4 particles per second.…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of the³⁰S(α, p) thermonuclear reaction in x-ray bursts

Kahl

Chen

Kubono

et al. 2016

EPJ Web of Conferences

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Abstract. We performed the first measurement of 30 S+α resonant elastic scattering to experimentally examine the 30 S(α, p) stellar reaction rate in type I x-ray bursts. These bursts are the most frequent thermonuclear explosions in the galaxy, resulting from thermonuclear runaway on the surface of accreting neutron star binaries. The 30 S(α, p) reaction plays a critical role in burst models, yet very little is known about the compound nucleus 34 Ar at these energies nor the reaction rate itself. We performed a measurement of alpha elastic scattering with a radioactive beam of 30 S to experimentally probe the entrance channel. Utilizing a gaseous active target system and silicon detector array, we extracted the excitation function from 1.8 to 5.5 MeV near 160 • in the center-of-mass frame. The experimental data were analyzed with an R-Matrix calculation, and we discovered several new resonances and extracted their quantum properties (resonance energy, width, spin, and parity). Finally, we calculated the narrow resonant thermonuclear reaction rate of 30 S(α, p) for these new resonances.

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“…A 24 Mg primary beam with an energy of 7.5 MeV/A and an intensity of 1.6 eμA extracted from the AVF cyclotron bombarded a 3 He gas target at 550 Torr and 90 K [31]. Then a secondary beam of 26 Si was produced by the 3 He( 24 Mg, 26 Si)n reaction and was separated by CRIB using the in-flight method.…”

Section: Methodsmentioning

confidence: 99%

Experimental study of resonant states in27P via elastic scattering of26Si+p

Jung¹,

Lee²,

Kwon³

et al. 2012

Phys. Rev. C

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Proton resonant states in 27 P were studied by the resonant elastic scattering of 26 Si + p with a 26 Si radioactive ion beam bombarding a thick H 2 gas target with the inverse kinematics method. The properties of these resonance states are important to better constrain the production rates of the 26 Si(p,γ ) 27 P reaction. This is one of the astrophysically important reactions needed to understand proton-rich nucleosynthesis such as the galactic production of 26 Al and energy generation in explosive stellar environments. Although there are recent studies on the resonant structure in 27 P, large uncertainties remain, and only a few levels are known. In this work, resonant states were observed over the excitation energies range of 2.3 to 3.8 MeV with high statistics and without background contamination within the target. The resonance parameters were extracted by an R-matrix analysis of the excitation function. The 26 Si(p,γ ) 27 P stellar reaction rate has been evaluated, including high-lying resonances found in this work.

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Development of a cryogenic gas target system for intense radioisotope beam production at CRIB

Cited by 65 publications

References 9 publications

First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
Self Cite
14
0
10
0
View full text Add to dashboard Cite

First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
Self Cite
14
0
10
0
View full text Add to dashboard Cite

Experimental investigation of the³⁰S(α, p) thermonuclear reaction in x-ray bursts

Experimental study of resonant states in27P via elastic scattering of26Si+p

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Development of a cryogenic gas target system for intense radioisotope beam production at CRIB

Cited by 65 publications

References 9 publications

First measurement of S30+α resonant elastic scattering for the S30Kahl1, Yamaguchi2, Kubono3 et al. 2018Phys. Rev. CSelf Cite140100View full textAdd to dashboardCite

First measurement of S30+α resonant elastic scattering for the S30Kahl1, Yamaguchi2, Kubono3 et al. 2018Phys. Rev. CSelf Cite140100View full textAdd to dashboardCite

Experimental investigation of the30S(α, p) thermonuclear reaction in x-ray bursts

Experimental study of resonant states in27P via elastic scattering of26Si+p

Contact Info

Product

Resources

About

First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
Self Cite
14
0
10
0
View full text Add to dashboard Cite

First measurement of S30+α resonant elastic scattering for the S30
Kahl
¹
,
Yamaguchi
²
,
Kubono
³

et al. 2018
Phys. Rev. C
Self Cite
14
0
10
0
View full text Add to dashboard Cite

Experimental investigation of the³⁰S(α, p) thermonuclear reaction in x-ray bursts