Measurement of the 8Li(α, n)11B reaction cross sections of astrophysical interest

Hashimoto, Takashi; Ishikawa, Tomoko; Kawamura, T.; Nakai, K.; Ishiyama, H.; Watanabe, Yutaka; Miyatake, H.; Tanaka, Manobu; Yoshikawa, N.; Jeong, Sohee; Fuchi, Y.; Katayama, Ichiro; Nomura, T.; Das, S.K.; Saha, P.K.; Fukuda, T.; Nishio, K.; Mitsuoka, S.; Ikezoe, H.; Matsuda, M.; Ichikawa, S.; Furukawa, T.; Izumi, H.; Shimoda, T.; Mizoi, Y.; Terasawa, M.

doi:10.1016/j.nuclphysa.2004.09.040

Cited by 11 publications

(8 citation statements)

References 10 publications

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“…Its extrapolation (dot-dashed curve) allowed us to evaluate the realistic upper limit of about 1 mb for the mean equivalent total cross section. This represents a negligible systematic increase of the 8 Li(α, n) 11 B cross section value, expected in the range 100 − 600 mb at E cm = 1.05 MeV [16,17,18,19,20,21,22].…”

Section: Measurement Without 4 He Targetmentioning

confidence: 79%

“…A multiple-sampling and tracking proportional chamber surrounded by modular neutron counters consisting of plastic scintillators was used. The results at E cm = 1.05 MeV by [20,21,22], obtained using the same set-up, are shown in Tab. 2.…”

Section: Discussionmentioning

confidence: 99%

“…2. Opposite to the 11 B-n coincidence approach [20,21,22] we have shown in this work that a single, simple correction is required to extract the cross section, namely the one for detection efficiency in Eq. 10, and that all the possible sources of systematic uncertainties give a negligible contribution.…”

Section: Discussionmentioning

confidence: 99%

“…Its extrapolation (dotted-dashed curve) allowed us to evaluate the realistic upper limit of about 1 mb for the mean equivalent total cross section. This represents a negligible systematic increase of the 8 Li(α, n) 11 B cross section value, expected in the range 100-600 mb at E cm = 1.05 MeV [16][17][18][19][20][21][22]. The measurement without 4 He was then performed to exclude the existence of additional, a priori unexpected, strong correlated background contributions attributable to the beam transit nearby and/or inside the gas target cell.…”

Section: Measurement Without the 4 He Targetmentioning

confidence: 99%

“…Available cross section data at center-of-mass (c.o.m.) energies of about 1 MeV range from about 100 to 600 mb [16][17][18][19][20][21][22]. Consequently, a more accurate experimental determination of the 8 Li+ 4 He → 11 B+n reaction cross section is needed.…”

Section: Introductionmentioning

confidence: 99%

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Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Cognata¹,

Zoppo²,

Alba³

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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Abstract. The8 Li+ 4 He → 11 B+n reaction inside the center of mass energy region E cm = 0.5 − 2.5 MeV, corresponding to the temperature range T 9 = 1 − 5, is of relevant interest in the fields of nuclear cosmology and nuclear astrophysics. In the context of Big-Bang nucleosynthesis, it has been invoked to overcome the A=8 mass gap; in r-process nucleosynthesis, it is considered a candidate precursor of seed nuclei. In this experimental work, the cross section, summed over all 11 B final bound states, at the energy of 1.05 MeV in the center-of-mass system, is investigated by a correction-free projectile-correlated inclusive neutron measurement. The radioactive 8 Li beam delivered by the EXCYT facility at LNS-Catania is used to induce the inversekinematics reaction process. A zero-energy-threshold 4π detection system is used. Thanks to the improved experimental and analysis procedures, the result obtained in this work represents a strong argument to reopen the debate on the magnitude of the 8 Li(α, n) 11 B reaction rate in explosive astrophysical environments.PACS numbers: 25.60. -t,26.30.-k,26.35.+c

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Section: Measurement Without 4 He Targetmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Measurement Without the 4 He Targetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Cognata¹,

Zoppo²,

Alba³

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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Status of the TRIUMF annular chamber for the tracking and identification of charged particles (TACTIC)

Ruprecht¹,

Gigliotti²,

Amaudruz³

et al.

The 2nd International Conference on Nuclear Physics in Astrophysics

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Abstract. TACTIC (TACTIC web site: http://tactic.triumf.ca) is a new detector for low-energy nuclear reactions currently under development at TRIUMF. The cylindrical ionization chamber allows threedimensional reconstruction of particle tracks by means of a two-dimensional anode array combined with a TOF measurement of the drift electrons. In addition, the integrated charge for each pulse provides information about the energy loss of the particle and therefore allows a better identification of the nuclear species producing the track. The geometry of TACTIC covers a large angular range permitting the measurement of differential cross-sections over a large solid angle. It will be ideal for investigations of nuclear processes pertinent to the field of nuclear astrophysics.PACS. 25.55.-e 3 H-, 3 He-, and 4 He-induced reactions -29.40.Cs Gas-filled counters: ionization chambers, proportional, and avalanche counters -29.40.Gx Tracking and position-sensitive detectors

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Excited Nuclear States for B-11 (Boron)

Sukhoruchkin

Soroko

2012

Nuclei With Z = 1 - 29

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Measurement of the 8Li(α, n)11B reaction cross sections of astrophysical interest

Cited by 11 publications

References 10 publications

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Status of the TRIUMF annular chamber for the tracking and identification of charged particles (TACTIC)

Excited Nuclear States for B-11 (Boron)

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Measurement of the 8Li(α, n)11B reaction cross sections of astrophysical interest

Cited by 11 publications

References 10 publications

Toward correction-free8Li(α,n)11B data at the Gamow energy of explosive nucleosynthesis

Toward correction-free8Li(α,n)11B data at the Gamow energy of explosive nucleosynthesis

Status of the TRIUMF annular chamber for the tracking and identification of charged particles (TACTIC)

Excited Nuclear States for B-11 (Boron)

Contact Info

Product

Resources

About

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis

Toward correction-free⁸Li(α,n)¹¹B data at the Gamow energy of explosive nucleosynthesis