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Journal Articles

Spallation and fragmentation cross sections for 168 MeV/nucleon $$^{136}$$Xe ions on proton, deuteron, and carbon targets

Sun, X. H.*; Wang, H.*; Otsu, Hideaki*; Sakurai, Hiroyoshi*; Ahn, D. S.*; Aikawa, Masayuki*; Fukuda, Naoki*; Isobe, Tadaaki*; Kawakami, Shunsuke*; Koyama, Shumpei*; et al.

Physical Review C, 101(6), p.064623_1 - 064623_12, 2020/06

 Times Cited Count:0 Percentile:100(Physics, Nuclear)

The spallation and fragmentation reactions of $$^{136}$$Xe induced by proton, deuteron and carbon at 168 MeV/nucleon were studied at RIKEN Radioactive Isotope Beam Factory via the inverse kinematics technique. The cross sections of the lighter products are larger in the carbon-induced reactions due to the higher total kinetic energy of carbon. The energy dependence was investigated by comparing the newly obtained data with previous results obtained at higher reaction energies. The experimental data were compared with the results of SPACS, EPAX, PHITS and DEURACS calculations. These data serve as benchmarks for the model calculations.

Journal Articles

Dipole strength distribution in $$^{206}$$Pb for the evaluation of the neutron capture cross section of $$^{205}$$Pb

Shizuma, Toshiyuki; Iwamoto, Nobuyuki; Makinaga, Ayano*; Massarczyk, R.*; Schwengner, R.*; Beyer, R.*; Bemmerer, D.*; Dietz, M.*; Junghans, A.*; K$"o$gler, T.*; et al.

Physical Review C, 98(6), p.064317_1 - 064317_12, 2018/12

 Times Cited Count:4 Percentile:48.88(Physics, Nuclear)

The dipole strength distribution of $$^{206}$$Pb was investigated via a nuclear resonance fluorescence experiment using bremsstrahlung produced with an electron beam at a kinetic energy of 10.5 MeV at the linear accelerator ELBE. We identified 88 states resonantly excited at energies from 3.7 to 8.2 MeV. The photo-absorption cross sections were extracted from the measured scattering cross sections and the branching ratios. The present ($$gamma$$,$$gamma'$$) data combined with ($$gamma$$,$$n$$) data from the literature were used as an input to the statistical calculation code CCONE to evaluate the neutron capture cross section of the unstable $$^{205}$$Pb nucleus.

Journal Articles

Erratum; Evidence for radiative coupling of the pygmy dipole resonance to excited states [Phys. Rev. C 86, 051302(R) (2012)]

Angell, C.; Hammond, S. L.*; Karwowski, H. J.*; Kelley, J. H.*; Krti$v{c}$ka, M.*; Kwan, E.*; Makinaga, Ayano*; Rusev, G.*

Physical Review C, 91(3), p.039901_1 - 039901_2, 2015/03

AA2014-0872.pdf:0.1MB

 Times Cited Count:5 Percentile:22.67(Physics, Nuclear)

Journal Articles

Evidence for radiative coupling of the pygmy dipole resonance to excited states

Angell, C.; Hammond, S. L.*; Karwowski, H.*; Kelley, J.*; Krti$v{c}$ka, M.*; Kwan, E.*; Makinaga, Ayano*; Rusev, G.*

Physical Review C, 86(5), p.051302_1 - 051302_5, 2012/11

 Times Cited Count:48 Percentile:6.9(Physics, Nuclear)

Journal Articles

Photodisintegration of $$^{80}$$Se; Implications for the s-process branching at $$^{79}$$Se

Makinaga, Ayano*; Utsunomiya, Hiroaki*; Goriely, S.*; Kaihori, Takeshi*; Goko, Shinji*; Akimune, Hidetoshi*; Yamagata, Tamio*; Toyokawa, Hiroyuki*; Matsumoto, Tetsuro*; Harano, Hideki*; et al.

Physical Review C, 79(2), p.025801_1 - 025801_8, 2009/02

 Times Cited Count:20 Percentile:22.19(Physics, Nuclear)

Photoneutron cross sections were measured for $$^{80}$$Se immediately above the neutron separation energy with quasimonochromatic $$gamma$$-ray beams to experimentally constrain the E1 $$gamma$$ strength function for $$^{79}$$Se. Two sets of the $$gamma$$ strength function and the level density that equally meet the experimental constraint predict largely different neutron capture cross sections for $$^{79}$$Se. Based on the Maxwell-averaged cross sections of the latest compilation complemented with the predicted cross sections for $$^{79}$$Se, we calculated $$sigma$$N values of the main s-process component using a phenomenological model and deduced empirical abundances of the weak s-process component.

Journal Articles

Photoneutron cross sections for $$^{80}$$Se; Implications for the s-process thermometer

Makinaga, Ayano*; Utsunomiya, Hiroaki*; Kaihori, Takeshi*; Yamagata, Tamio*; Akimune, Hidetoshi*; Goriely, S.*; Toyokawa, Hiroyuki*; Matsumoto, Tetsuro*; Harano, Hideki*; Harada, Hideo; et al.

Nuclear Physics A, 805(1-4), p.564 - 566, 2008/06

Photoneutron cross sections were measured for $$^{80}$$Se near the neutron threshold energy with quasi-monochromatic $$gamma$$ rays. Using the $$^{80}$$Se($$gamma$$,$$n$$) cross section as experimental constraints on the E1 $$gamma$$ strength function, we estimate the neutron capture rates for $$^{79}$$Se. The solar abundance ratio of s-only nuclides $$^{80}$$Kr and $$^{82}$$Kr are analyzed in terms of the s-process branching at $$^{79}$$Se within the local approximation. The corresponding temperature and neutron density regimes are discussed in the light of the s-process scenario in massive stars.

Journal Articles

Measurements of the $$^{152}$$Sm($$gamma$$,n) cross section with laser-Compton scattering $$gamma$$ rays and the photon difference method

Hara, Kaoru; Harada, Hideo; Kitatani, Fumito; Goko, Shinji*; Hohara, Shinya*; Kaihori, Takeshi*; Makinaga, Ayano*; Utsunomiya, Hiroaki*; Toyokawa, Hiroyuki*; Yamada, Kawakatsu*

Journal of Nuclear Science and Technology, 44(7), p.938 - 945, 2007/07

 Times Cited Count:26 Percentile:13.35(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Photonuclear reaction cross section of $$^{152}$$Sm

Hara, Kaoru; Harada, Hideo; Kitatani, Fumito; Goko, Shinji*; Hohara, Shinya*; Kaihori, Takeshi*; Makinaga, Ayano*; Utsunomiya, Hiroaki*; Toyokawa, Hiroyuki*; Yamada, Kawakatsu*; et al.

EUR-22794-EN, p.65 - 68, 2007/00

Neutron capture cross sections of the unstable nuclei $$^{151}$$Sm (t$$_{1/2}$$=90yr) are the fundamental data for the nuclear transmutation, since the $$^{151}$$Sm is one of radioactive fission products in the nuclear waste. On the other hand, the branching point nucleus $$^{151}$$Sm is important for characterizing the slow neutron capture process (s-process) nucleosynthesis in the AGB stars. The cross sections of the inverse $$^{152}$$Sm($$gamma$$,n)$$^{151}$$Sm reaction were measured with the laser-Compton scattering (LCS) $$gamma$$ rays at 8.3-12.4 MeV. Quasi-monochromatic beams of LCS photons irradiated an enriched $$^{152}$$Sm$$_2$$O$$_3$$ sample. The emitted neutrons were detected with a 4$$pi$$ neutron detector consisting of 20 $$^{3}$$He proportional counters embedded in a polyethylene moderator. The $$^{197}$$Au($$gamma$$,n) reaction cross sections were also measured as a standard. In the data analysis, the ($$gamma$$,n) cross sections are deduced with two methods. The present data for $$^{152}$$Sm and $$^{197}$$Au are compared with the previous data compiled in the IAEA document and the calculation with a nuclear reaction code TALYS. The neutron capture cross sections for $$^{151}$$Sm in the keV-MeV energy range are evaluated with the present photonuclear data for $$^{152}$$Sm as constraint in the statistical model calculations.

Journal Articles

Photoneutron cross section measurement for $$^{94}$$Zr using laser inverse Compton $${gamma}$$ rays

Hohara, Shinya*; Goko, Shinji*; Makinaga, Ayano*; Kaihori, Takeshi*; Toyokawa, Hiroyuki*; Utsunomiya, Hiroaki*; Hara, Kaoru; Kitatani, Fumito; Harada, Hideo; Matsumoto, Tetsuro*; et al.

JAEA-Conf 2006-009, p.66 - 69, 2006/11

no abstracts in English

Journal Articles

Photodisintegration of $$^{80}$$Se as a probe of neutron capture for the s-process branch-point nucleus $$^{79}$$

Makinaga, Ayano*; Hohara, Shinya*; Utsunomiya, Hiroaki*; Goko, Shinji*; Kaihori, Takeshi*; Akimune, Hidetoshi*; Yamagata, Tamio*; Goriely, S.*; Toyokawa, Hiroyuki*; Harano, Hideki*; et al.

Proceedings of Science (Internet), 4 Pages, 2006/10

no abstracts in English

Journal Articles

Photodisintegration cross section measurements on $$^{186}$$W, $$^{187}$$Re and $$^{188}$$Os; Implications for the Re-Os cosmochronology

Shizuma, Toshiyuki; Utsunomiya, Hiroaki*; Mohr, P.*; Hayakawa, Takehito; Goko, Shinji*; Makinaga, Ayano*; Akimune, Hidetoshi*; Yamagata, Tamio*; Ota, Masahisa*; Ogaki, Hideaki*; et al.

Physical Review C, 72(2), p.025808_1 - 025808_9, 2005/08

 Times Cited Count:36 Percentile:10.88(Physics, Nuclear)

Cross sections of the $$^{186}$$W, $$^{187}$$Re, $$^{188}$$Os($$gamma,n$$) reactions were measured using quasi-monochromatic photon beams from laser Compton scattering (LCS) with average energies from 7.3 to 10.9 MeV. The results are compared with the predictions of Hauser-Feshbach statistical calculations using four different sets of input parameters. In addition, the inverse neutron capture cross sections were evaluated by constraining the model parameters, especially the $$E1$$ strength function, on the basis of the experimental data. The present experiment helps to further constrain the correction factor $$F_{sigma}$$ for the neutron capture on the 9.75 keV state in $$^{187}$$Os. Implications of $$F_{sigma}$$ to the Re-Os cosmochronology are discussed with a focus on the uncertainty in the estimate of the age of the Galaxy.

Journal Articles

Photoneutron cross section measurements on $$^{186}$$W, $$^{187}$$Re and $$^{188}$$Os for cosmochronology

Shizuma, Toshiyuki; Utsunomiya, Hiroaki*; Goko, Shinji*; Mohr, P.*; Hayakawa, Takehito; Makinaga, Ayano*; Hara, Kaoru*; Ogaki, Hideaki*; Lui, Y.-W.*; Goriely, S.*

Nuclear Physics A, 758, p.561c - 564c, 2005/07

Photodisintegration experiments were carried out for $$^{186}$$W, $$^{187}$$Re, and $$^{188}$$Os using quasi-monochromatic $$gamma$$-ray beams from laser Compton scattering (LCS) at the National Institute of Advanced Industrial Science and Technology. The excitation function of ($$gamma$$,n) cross sections was measured for the three nuclei near neutron thresholds, taking advantage of the intense peaking of the energy-tunable LCS beam in the energy region of astrophysical importance. Neutron capture cross sections for $$^{185}$$W, $$^{186}$$Re, and $$^{187}$$Os are evaluated from the photodisintegration data with the Hauser-Feshbach statistical model. We quantitatively discuss the two corrections factors for the s-process branchings and the neutron capture on the 9.75 keV state.

Journal Articles

$$s$$-process branching at $$^{185}$$W revised

Mohr, P.*; Shizuma, Toshiyuki; Ueda, Hiroyasu*; Goko, Shinji*; Makinaga, Ayano*; Hara, Kaoru*; Hayakawa, Takehito; Lui, Y.-W.*; Ogaki, Hideaki*; Utsunomiya, Hiroaki*

Physical Review C, 69(3), p.032801_1 - 032801_4, 2004/03

 Times Cited Count:30 Percentile:16.61(Physics, Nuclear)

The neutron capture cross section of the unstable s-process branching nucleus $$^{185}$$W has been derived from experimental data of the inverse $$^{186}$$W($$gamma$$,n)$$^{185}$$W photodisintegration taken with monochromatic photon beams from laser Compton scattering. The result of $$sigma = 553 pm 60$$mb at $$kT = 30$$keV leads to a relatively high effective neutron density in the classical s process of $$N_{rm{n}} = 4.7 times 10^8,{rm{cm}}^{-3}$$. A realistic model for the s process in thermally pulsing AGB stars overestimates the abundance of $$^{186}$$Os significantly because of the relatively small neutron capture cross section of $$^{185}$$W.

Oral presentation

Measurements of $$^{152}$$Sm($$gamma$$,n) reaction cross section with laser-Compton scattering $$gamma$$ rays

Hara, Kaoru; Kitatani, Fumito; Harada, Hideo; Akimune, Hidetoshi*; Utsunomiya, Hiroaki*; Kaihori, Takeshi*; Goko, Shinji*; Hohara, Shinya*; Makinaga, Ayano*; Yamagata, Tamio*; et al.

no journal, , 

no abstracts in English

Oral presentation

Measurement of $$^{91}$$Zr($$gamma$$,n)$$^{90}$$Zr cross section

Hohara, Shinya*; Goko, Shinji*; Makinaga, Ayano*; Kaihori, Takeshi*; Hara, Kaoru; Kitatani, Fumito; Toyokawa, Hiroyuki*; Matsumoto, Tetsuro*; Harano, Hideki*; Harada, Hideo; et al.

no journal, , 

no abstracts in English

Oral presentation

Cross section of the $$^{152}$$Sm($$gamma$$,n) reaction and s-process

Hara, Kaoru; Kitatani, Fumito; Harada, Hideo; Utsunomiya, Hiroaki*; Kaihori, Takeshi*; Goko, Shinji*; Hohara, Shinya*; Makinaga, Ayano*; Toyokawa, Hiroyuki*; Watanabe, Yukinobu*

no journal, , 

no abstracts in English

Oral presentation

s-process branching of $$^{79}$$Se

Makinaga, Ayano*; Utsunomiya, Hiroaki*; Goko, Shinji*; Kaihori, Takeshi*; Harada, Hideo; Kitatani, Fumito; Hara, Kaoru; Toyokawa, Hiroyuki*; Harano, Hideki*; Matsumoto, Tetsuro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Photonuclear reaction cross sections of Cl-37 and Sm-152

Hara, Kaoru; Harada, Hideo; Kitatani, Fumito; Goko, Shinji*; Hohara, Shinya*; Kaihori, Takeshi*; Makinaga, Ayano*; Utsunomiya, Hiroaki*; Toyokawa, Hiroyuki*; Watanabe, Yukinobu*

no journal, , 

Neutron capture cross sections of the unstable nuclei $$^{36}$$Cl (t$$_{1/2}$$=3.0$$times$$10$$^{5}$$ yr) and $$^{151}$$Sm (t$$_{1/2}$$=90 yr) are the fundamental data for the nuclear transmutation. The cross sections of the inverse $$^{37}$$Cl($$gamma$$,n)$$^{36}$$Cl and $$^{152} $$Sm($$gamma$$,n)$$^{151}$$Sm reaction were measured with the laser-Compton scattering (LCS) $$gamma$$ rays at 10.4-12.0 MeV and 8.3-12.4 MeV, respectively. Quasi-monochromatic beams of LCS photons irradiated a natural NaCl sample and an enriched $$^{152}$$Sm$$_2$$O$$_3$$ sample. The emitted neutrons were detected with a 4$$pi$$ neutron detector. The energy distribution of LCS $$gamma$$ beam was measured with a 120 $$%$$ Ge detector or the high-resolution high-energy photon spectrometer (HHS). The present data for $$^{37}$$Cl, $$^{152}$$Sm, and $$^{197}$$Au are compared with the previous data compiled in the IAEA document and the calculation with a nuclear reaction code TALYS.

Oral presentation

Measurement of dipole transition strength of Pb-206 using nuclear resonance fluorescence

Shizuma, Toshiyuki*; Iwamoto, Nobuyuki; Makinaga, Ayano*; Schwengner, R.*; Beyer, R.*; Bemmerer, D.*; Dietz, M.*; Junghans, A.*; Koegler, T.*; Ludwig, F.*; et al.

no journal, , 

The scattered $$gamma$$-rays from nuclear resonance fluorescence of Pb-206 were measured, irradiating bremsstrahlung $$gamma$$-rays at the HZDR in Germany, in order to evaluate neutron capture cross section of unstable Pb-205. The absorption cross section of $$gamma$$-rays for Pb-206 was fixed with the scattering strengths derived from the measured data. In this talk the neutron capture cross section of Pb-205 evaluated will be reported, together with the measured results.

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