Cyclotron Facility| 大阪大学核物理研究センター | Research Center for Nuclear Physics, Osaka University

Cyclotoron Facility > About Cyclotron Facility > Beamlines and experimental devices > EN Course

EN Course

Introduction
Specification
Layout
Recent Results
Publication List
PhD Receipients

EN Course is the RCNP inflight-fragment separator dedicated to the study of
atomic nuclei, in particular the nuclei with excessive proton(s) or neutron(s).
These nuclei, more commonly known as neutron-rich or proton-rich nuclei, are naturally unstable and are in most cases, naturally non-occurring. Since these nuclei are not available as target, one has to find ways to produce them as beam in laboratories in order to study their structures and /or the reactions involving them. At the EN course, unstable nuclei or radio-isotope (RI) beams are produced through fragmentation reaction of a fast beam of stable heavy ions (from 12C to 136Xe) on a thin target. The RI beams thus produced have velocities close to that of the beam and can be separated inflight. Various types of RI beams can be produced with this method. At the RCNP course, we bombard an RI beam at energy between10-50 MeV/nucleon on a hadronic target (hydrogen, deuterium, etc.), and study the structure of the unstable nucleus employing the nuclear reaction in inverse kinematics.

For more technial information, please refere to the following papers.

*	S. Mitsuoka, et al.,Nucl. Instr. Meth. Phys. A 372 (1996) 489-500. "Performance of fragment separator with homogeneously thick energy degrader: a highly flexible system for use with degraders in a wide thickness range.
*	T. Shimoda, et al., Nucl. Instr. Meth. Phys. B 70 (1992) 320 - 330. "Design study of the secondary-beam line at RCNP"

The EN course consists of a primary target station (denoted as F0), a two-stage fragment separator, and a final focal plane (denoted as F3) where the secondary (reaction) target and experiment setup are placed. The configuration of the magnets between F0 and F3 is as follows: F0-Q-Q-Q-D-SX-F1-SX-Q-D-Q-Q-Q-F2-Q-Q-F3, where Q, D and SX represent quadrupole, dipole and sextupole magnets respectively. The maximum magnetic rigidity of the EN course is 3.4 Tm. The energy dispersion at the first focal plane (F1) of the EN course is 866 mm/100% and the maximum momentum acceptance is 8%. Magnification as small as 2 (beam spot around 1 cm or less) can be achieved at F3. By using a primary 18O beam 60 MeV/nucleon and with intensity as high as 125 pnA, we have produced neutron-rich 16C beam at a momentum acceptance of 2% with intensity as high as 2x10⁵ counts per second. Other unstable nuclei such as ¹⁴O has also been produced with intensity sufficient for nuclear spectroscopy.

For more technial information, please refere to the following papers.

*	S. Mitsuoka, et al.,Nucl. Instr. Meth. Phys. A 372 (1996) 489-500. "Performance of fragment separator with homogeneously thick energy degrader: a highly flexible system for use with degraders in a wide thickness range.
*	T. Shimoda, et al., Nucl. Instr. Meth. Phys. B 70 (1992) 320 - 330. "Design study of the secondary-beam line at RCNP"

EN Separator
Bending Radius	2.2 m
Bending Angle	60deg
Bending Power	3.4 Tm
Momentum Dispersion	17mm/%
Angular Acceptance: x	+/- 20mrad
Angular Acceptance: y	+/- 14mrad
Momentum Acceptance	+/- 4%

We have successfully performed an experiment at the EN course using RI beams at around 50 MeV/nucleon to measure the charge-changing cross sections of neutron-rich beryllium, boron and carbon isotopes. Using the Glauber model, the proton-distribution radii of the ^12-18C were determined. The proton- distribution radii were found to be almost constant for ^14,16-18C, indicating almost inert proton distribution towards addition of neutron in those carbon isotopes. More detailed reaction calculations are in progress.


Publications
2022
1	W.Liu, J.L.Lou, Y.L.Ye, S.M.Wang, Z.W.Tan, Z.H.Li, Q.T.Li, H.Hua, X.F.Yang, J.Y.Xu, H.J.Ong, D.T.Tran, N.Aoi, E.Ideguchi, D.Y.Pang, C.X.Yuan, Y.Jiang, B.Yang, Y.Liu, J.G.Li, Z.Q.Chen, J.X.Han, S.W.Bai, G.Li, K.Ma, H.Y.Zhu, and B.L.Xia, New investigation of low-lying states in 12Be via a 2H(13B,3He) reaction Physical Review C 105, 034613 (2022)
2021
1	W.Liu, J.L.Lou, Y.L.Ye, Z.H.Li, Q.T.Li, H.Hua, X.F.Yang, J.Y.Xu, H.J.Ong, D.T.Tran, N.Aoi, E.Ideguchi, D.Y.Pang, C.X.Yuan, S.M.Wang, Y.Jiang, B.Yang, Y.Liu, J.G.Li, Z.Q.Chen, J.X.Han, S.W.Bai, G.Li, K.Ma, Z.W.Tan, H.Y.Zhu, B.L.Xia, s- and d-wave intruder strengths in 13Bg.s.via the 1H(13B,d) 12B reaction Phys. Rev. C 104, 064605 (2021). https://doi.org/10.1103/PhysRevC.104.064605
2	J.Chen, S.M.Wang, H.T.Fortune, J.L.Lou*, Y.L.Ye, Z.H.Li, N.Michel, J.G.Li, C.X.Yuan, Y.C.Ge, Q.T.Li, H.Hua, D.X.Jiang, X.F.Yang, D.Y.Pang, F.R.Xu, W.Zuo, J.C.Pei, J.Li, W.Jiang, Y.L.Sun, H.L.Zang, N.Aoi, H.J.Ong, E.Ideguchi, Y.Ayyad, K.Hatanaka, D.T.Tran, D.Bazin, J.Lee, Y.N.Zhang, J.Wu, H.N.Liu, C.Wen, T.Yamamoto, M.Tanaka, and T.Suzuki, Observation of the near-threshold intruder 0− resonance in 12Be Phys. Rev. C 103, L031302 (2021). https://doi.org/10.1103/PhysRevC.103.L031302
2020
1	D. T. Tran, S. Terashima, H. J. Ong, K. Hirakawa, N. Aoi, A. Kohda, I. Tanihata et al., Novel multi-layer plastic-scintillator-based solid active proton target for inverse-kinematics experiments Nucl. Inst. and Meth. in Phys. Res. A 959, 163514 (2020). https://doi.org/10.1016/j.nima.2020.163514
2019
1	T.Furuno, T.Kawabata, S.Adachi, Y.Ayyad, Y.Kanada-En’yo, Y.Fujikawa, K.Inaba, M.Murata, H.J.Ong, M.Sferrazza, Y.Takahashi, T.Takeda, I.Tanihata, D.T.Tran, and M.Tsumura, Neutron quadrupole transition strength in 10C deduced from the 10C(a,a') measurement with the MAIKo active target Phys. Rev. C 100, 054322 (2019). https://doi.org/10.1103/PhysRevC.100.054322
2018
1	T.Furuno, T.Kawabata, H.J.Ong, S.Adachi, Y.Ayyad, T.Baba, Y.Fujikawa, T.Hashimoto, K.Inaba, Y.Ishii, S.Kabuki, H.Kubo, Y.Matsuda, Y.Matsuoka, T.Mizumoto, T.Morimoto, M.Murata, T.Sawano, T.Suzuki, A.Takada, J.Tanaka, I.Tanihata, T.Tanimori, D.T.Tran, M.Tsumura, H.D.Watanabe, Performance test of the MAIKo active target Nuclear Instruments and Methods in Physics A 908, 215 (2018) https://doi.org/10.1016/j.nima.2018.08.042
2	Y.Jiang, J.L.Lou, Y.L.Ye, D.Y.Pang, J.Chen, Z.H.Li, Y.C.Ge, Q.T.Li, J.Li, W.Jiang, Y.L.Sun, H.L.Zang, Y.Zhang, W.Liu, Y.D.Chen, G.Li, N.Aoi, E.Ideguchi, H.J.Ong, J.Lee, J.Wu, H.N.Liu, C.Wen, Y.Ayyad, K.Hatanaka, D.T.Tran, T.Yamamoto, M.Tanaka, T.Suzuki, and T.T.Nguyen, A new measurement of 11Be(p,d) transfer reaction Chinese Physics Letters 35, 082501 (2018) https://doi.org/10.1088/0256-307X/35/8/082501
3	J.Chen, J.L.Lou, Y.L.Ye, Z.H.Li, D.Y.Pang, C.X.Yuan, Y.C.Ge, Q.T.Li, H.Hua, D.X.Jiang, X.F.Yang, F.R.Xu, J.C.Pei, J.Li, W.Jiang, Y.L.Sun, H.L.Zang, Y.Zhang, G.Li, N.Aoi, E.Ideguchi, H.J.Ong, J.Lee, J.Wu, H.N.Liu, C.Wen, Y.Ayyad, K.Hatanaka, D.T.Tran, T.Yamamoto, M.Tanaka, and T.Suzuki, Low-lying states in 12Be using one-neutron transfer reaction Physical Review C 98, 014616 (2018) https://doi.org/10.1103/PhysRevC.98.014616
4	J.Chen, J.L.Lou, Y.L.Ye, Z.H.Li, D.Y.Pang, C.X.Yuan, Y.C.Ge, Q.T.Li, H.Hua, D.X.Jiang, X.F.Yang, F.R.Xu, J.C.Pei, J.Li, W.Jiang, Y.L.Sun, H.L.Zang, Y.Zhang, N.Aoi, E.Ideguchi, H.J.Ong, J.Lee, J.Wu, H.N.Liu, C.Wen, Y.Ayyad, K. Hatanaka, D.T.Tran, T.Yamamoto, M.Tanaka, T.Suzuki, A new measurement of the intruder configuration in 12Be Physics Letters B 781, 412 (2018) https://doi.org/10.1016/j.physletb.2018.04.016
5	D.T.Tran, H.J.Ong, G. Hagen, T.D. Morris, N.Aoi, T.Suzuki, Y.Kanada-En'yo, L.S. Geng, S.Terashima, I.Tanihata, T.T.Nguyen, Y.Ayyad, P.Y.Chan, M.Fukuda, H.Geissel, M.N.Harakeh, T.Hashimoto, T.H.Hoang, E.Ideguchi, A.Inoue, G.R. Jansen, R.Kanungo, T.Kawabata, L.H.Khiem, W.P.Lin, K.Matsuta, M.Mihara, S.Momota, D.Nagae, N.D.Nguyen, D.Nishimura, T.Otsuka, A.Ozawa, P.P.Ren, H.Sakaguchi, C.Scheidenberger, J.Tanaka, M.Takechi, R.Wada, and T.Yamamoto, Evidence for prevalent Z=6 magic number in neutron-rich carbon isotopes Nature Communications 9, 1594 (2018) https://doi.org/10.1038/s41467-018-04024-y
2017
1	D.A. Matters, F.G. Kondev, N. Aoi, E. Ideguchi, H.J. Ong et al. In-beam gamma-ray spectroscopy studies of medium-spin states in the odd-odd nucleus 186Re Phys. Rev. C 96, 014318 (2017) https://doi.org/10.1103/PhysRevC.96.014318
2	L. Yu, S. Terashima, H. Ong, P. Chan, I. Tanihata, C. Iwamoto, D. Tran, A. Tamii, N. Aoi, H. Fujioka, G. Gey, H. Sakaguchi, A. Sakaue, B. Sun, T. Tang, T. Wang, Y. Watanabe, G. Zhang, Multi-layer plastic scintillation detector for intermediate- and high-energy neutrons with n−γdiscrimination capability Nucl. Instruments Methods Phys. Res. Sect. A Accel. Spectrometers, Detect. Assoc. Equip., vol. 866, sep 2017, pp. 118–128. https://doi.org/10.1016/j.nima.2017.05.044
2016
1	J. Chen, J. L. Lou, Y. L. Ye, Z. H. Li, Y. C. Ge, Q. T. Li, J. Li, W. Jiang, Y. L. Sun, H. L. Zang, N. Aoi, E. Ideguchi, H. J. Ong, Y. Ayyad, K. Hatanaka, D. T. Tran, T. Yamamoto, M. Tanaka, T. Suzuki, N. T. Tho, J. Rangel, A. M. Moro, D. Y. Pang, J. Lee, J. Wu, H. N. Liu, C. Wen, Elastic scattering and breakup of ¹¹Be on protons at 26.9A MeV Phys. Rev. C, vol. 93, no. 3, mar 2016, pp. 034623. https://doi.org/10.1103/PhysRevC.93.034623
2	. Chen, J. L. Lou, Y. L. Ye, J. Rangel, A. M. Moro, D. Y. Pang, Z. H. Li, Y. C. Ge, Q. T. Li, J. Li, W. Jiang, Y. L. Sun, H. L. Zang, Y. Zhang, N. Aoi, E. Ideguchi, H. J. Ong, J. Lee, J. Wu, H. N. Liu, C. Wen, Y. Ayyad, K. Hatanaka, T. D. Tran, T. Yamamoto, M. Tanaka, T. Suzuki, T. T. Nguyen, Elastic scattering and breakup of ¹¹Be on deuterons at 26.9A MeV Phys. Rev. C, vol. 94, no. 6, dec 2016, pp. 064620. https://doi.org/10.1103/PhysRevC.94.064620

3	Y. L. Sun, J. Lee, Y. L. Ye, A. Obertelli, Z. H. Li, N. Aoi, H. J. Ong, Y. Ayyad, C. A. Bertulani, J. Chen, A. Corsi, F. Cappuzzello, M. Cavallaro, T. Furono, Y. C. Ge, T. Hashimoto, E. Ideguchi, T. Kawabata, J. L. Lou, Q. T. Li, G. Lorusso, F. Lu, H. N. Liu, S. Nishimura, H. Suzuki, J. Tanaka, M. Tanaka, D. T. Tran, M. B. Tsang, J. Wu, Z. Y. Xu, T. Yamamoto, Experimental study of the knockout reaction mechanism using ¹⁴O at 60 MeV/nucleon Phys. Rev. C, vol. 93, no. 4, apr 2016, pp. 044607. https://doi.org/10.1103/PhysRevC.93.044607
4	D. T. Tran, H. J. Ong, T. T. Nguyen, I. Tanihata, N. Aoi, Y. Ayyad, P. Y. Chan, M. Fukuda, T. Hashimoto, T. H. Hoang, E. Ideguchi, A. Inoue, T. Kawabata, L. H. Khiem, W. P. Lin, K. Matsuta, M. Mihara, S. Momota, D. Nagae, N. D. Nguyen, D. Nishimura, A. Ozawa, P. P. Ren, H. Sakaguchi, J. Tanaka, M. Takechi, S. Terashima, R. Wada, T. Yamamoto, Charge-changing cross-section measurements of^12-16C at around A45AMeV and development of a Glauber model for incident energies 10A−2100MeV Phys. Rev. C, vol. 94, no. 6, dec 2016, pp. 064604. https://doi.org/10.1103/PhysRevC.94.064604
2015
1	J. Kamiya, Y. Hikichi, M. Kinsho, N. Ogiwara, M. Fukuda, N. Hamatani, K. Hatanaka, K. Kamakura, K. Takahisa, Titanium alloy as a potential low radioactivation J. Vac. Sci. Technol. A Vacuum, Surfaces, Film., vol. 33, no. 3, 2015, pp. 31605. https://doi.org/10.1116/1.4916934
2	H. Nishibata, R. Leguillon, A. Odahara, T. Shimoda, C. M. Petrache, Y. Ito, J. Takatsu, K. Tajiri, N. Hamatani, R. Yokoyama, E. Ideguchi, H. Watanabe, Y. Wakabayashi, K. Yoshinaga, T. Suzuki, S. Nishimura, D. Beaumel, G. Lehaut, D. Guinet, P. Desesquelles, D. Curien, K. Higashiyama, N. Yoshinaga, High-spin states in ¹³⁶La and possible structure change in the N=79 region Phys. Rev. C, vol. 91, no. 5, 2015, pp. 54305. https://doi.org/10.1103/PhysRevC.91.054305
Before 2014
1	" Nuclear physics frontier at RCNP, Osaka University "
	H. J. Ong,
	AIP Conf. Proc. 1588 (2014) 146.
2	" Revised spin-parity assignment and a new interpretation of the high-spin isomer in 151Er"
	T. Fukuchi, T. Hori, T. Masue, K. Tajiri, A. Sato, T. Furukawa, A. Odahara, T. Shimoda, Y. Wakabayashi, Y. Gono, T. Suzuki, M. Ukai, T. Wakui, A. Yamazaki, Y. Miyashita, N. Sato, M. Tateoka, M. Ohguma, T. Shinozuka, T. Koike, K. Shirotori, Y. Miura, S. Kinoshita, Y. Ma, Y.Y. Fu, H. Tamura,
	Eur. Phys. J. A 39 (2009) 49 - 51.
3	"β decay of the 21/2+ isomer in 93Mo and level structure of 93Nb"
	T. Hori, T. Masue, A. Odahara, K. Kura, K. Tajiri, T. Shimoda, T. Fukuchi, T. Suzuki, Y. Wakabayashi, Y. Gono, and K. Ogawa,
	Phys. Rev. C 80 (2009) 034306.
4	"Performance of fragment separator with homogeneously thick energy degrader: a highly flexible system for use with degraders in a wide thickness range "
	S. Mitsuoka, T. Shimoda, H. Miyatake, Y. Mizoi, H. Kobayashi, M. Sasaki, T. Shirakura, N. Takahashi, T. Murakami, S. Morinobu,
	Nucl. Instr. Meth. Phys. A 372 (1996) 489-500.
5	"Design study of the secondary-beam line at RCNP"
	T. Shimoda, H. Miyatake, S. Morinobu,
	Nucl. Instr. Meth. Phys. B 70 (1992) 320 - 330.
*	" Revised spin-parity assignment and a new interpretation of the high-spin isomer in 151Er"
	T. Fukuchi, T. Hori, T. Masue, K. Tajiri, A. Sato, T. Furukawa, A. Odahara, T. Shimoda, Y. Wakabayashi, Y. Gono, T. Suzuki, M. Ukai, T. Wakui, A. Yamazaki, Y. Miyashita, N. Sato, M. Tateoka, M. Ohguma, T. Shinozuka, T. Koike, K. Shirotori, Y. Miura, S. Kinoshita, Y. Ma, Y.Y. Fu, H. Tamura,
	Eur. Phys. J. A 39 (2009) 49 - 51.
*	"β decay of the 21/2+ isomer in 93Mo and level structure of 93Nb"
	T. Hori, T. Masue, A. Odahara, K. Kura, K. Tajiri, T. Shimoda, T. Fukuchi, T. Suzuki, Y. Wakabayashi, Y. Gono, and K. Ogawa,
	Phys. Rev. C 80 (2009) 034306.
*	"Performance of fragment separator with homogeneously thick energy degrader: a highly flexible system for use with degraders in a wide thickness range "
	S. Mitsuoka, T. Shimoda, H. Miyatake, Y. Mizoi, H. Kobayashi, M. Sasaki, T. Shirakura, N. Takahashi, T. Murakami, S. Morinobu,
	Nucl. Instr. Meth. Phys. A 372 (1996) 489-500.
*	"Design study of the secondary-beam line at RCNP"
	T. Shimoda, H. Miyatake, S. Morinobu,
	Nucl. Instr. Meth. Phys. B 70 (1992) 320 - 330.
Talks
*	" RI beam facility at RCNP, Osaka University "
	(Invited Talk) H. J. Ong,
	International Symposium on Physics of Unstable Nuclei (ISPUN2014), Ho Chi Minh, Vietnam, November 4, 2014.
*	" Nuclear physics frontier at RCNP, Osaka University "
	(Invited Talk) H. J. Ong,
	Fourth International Meeting on Frontiers of Physics (IMFP2013), Kuala Lumpur, Malaysia, August 29, 2013.
Theses
*	" Determination of proton distribution radii of Be isotopes via charge-changing cross section measurements "
	T. Naito, Master's Thesis, Osaka University, 2011.
*	" Determination of proton distribution radii of C isotopes via charge-changing cross section measurements "
	M. Taniguchi, Master's Thesis, Nara Women's University, 2011.
*	" Determination of proton distribution radii of Be isotopes "
	K. Hirota, Master's Thesis, Osaka University, 2010.

◯	Yasutaka Yamamoto	Osaka University, Japan	2023	Study of meson exchange current in l-forbidden M1 transition around N = 28 shell closure
◯	LIU Wei	Peking University, CHINA	2021
◯	Tatsuya Furuno	Kyoto University, Japan	2020	Missing-mass spectroscopy of short-lived nuclei at low-momentum transfer region opened by the MAIKo active target
◯	TRAN Dinh Trong	Osaka University, Japan	2017	Study of nucleon density distributions of nuclei and energy dependence of the charge changing cross sections via Glauber model
◯	CHEN Jie	Peking University, CHINA	2015
◯	SUN Ye Lei	Peking University, CHINA	2015
◯	Taiki Uemura	Osaka University, Japan	2015	A Study on Soft Error Mitigation for Microprocessor in Bulk CMOS Technology
◯	Ryo Harada	Osaka University, Japan	2014	A Study on Experimental Characterization of Radiation-Induced Soft Errors for Low Voltage VLSI Circuits
◯	Shinichi MITSUOKA	Kyushu University, Japan	1996 February	Study of Mechanism of (¹⁴N,¹²B) Reactions at Intermediate Energy-Origin of Large Spin-Polarization of Projectile-Like Fragments