Production and separation of the nuclides near to the neutron number 126 on the r-process path

2013 Fiscal Year Final Research Report

• Project/Area Number: 23244060
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: JEONG SUNCHAN 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (00262105)
• Co-Investigator(Kenkyū-buntansha): HIRAYAMA Yshikazu 高エネルギー加速器機構, 素粒子原子核研究所, 助教 (30391733) ; MIYATAKE Hiroari 高エネルギー加速器機構, 素粒子原子核研究所, 教授 (50190799) ; ISHIYAMA Hironobu 高エネルギー加速器機構, 素粒子原子核研究所, 研究機関講師 (50321534) ; WATANABE Yutaka 高エネルギー加速器機構, 素粒子原子核研究所, 研究機関講師 (50353363) ; IMAI Nobuaki 高エネルギー加速器機構, 素粒子原子核研究所, 助教 (80373273)
• Co-Investigator(Renkei-kenkyūsha): MUKAI Momo 筑波大学大学院, 物理学研究科, 修士過程2 ; KIMURA Sota 筑波大学大学院, 物理学研究科, 博士過程1 ; KIM Yung-hee ソウル大学大学院, 物理天文学科, 博士過程2 ; OYAIZU Mchihiro 高エネルギー加速器研究機構, 素粒子原子核研究所, 研究支援員
• Project Period (FY): 2011-04-01 – 2014-03-31
• Keywords: ｒ－過程第3ピーク滞留核 / レーザーイオン化 / 多核子移行反応 / 元素選択型同位体分離器

Research Abstract

We have developed an element-selective isotope separator KISS (KEK Isotope Separator System) for direct access to the waiting nuclei with neutron number (N) of 126 on the r-process path in the chart of nuclides. The performance of the KISS was investigated by using beams from RIKEN Ring Cyclotron. The performance achieved so far for iron was about 1/400, 200, and 200ms for the overall extraction efficiency, selectivity, and average extraction time, respectively, without a significant degradation up to the beam intensity of 4pnA. In the test using the 124Xe beam, the target (198Pt)-recoils were successfully extracted as singly charged ions with similar performance. The KISS is ready to explore beta-decaying properties of the nuclei near to N=126 not yet reached so far.In addition, from the measured cross sections of the multi-nucleon transfer (MNT) channels in the 136Xe+198Pt system, we demonstrated that the MNT would be promising for producing such heavy neutron-rich nuclei.

Research Products

• [Journal Article] Ionization cross section measurements for autoionizing states of iridium and rhenium (2014)
  • Author(s): Hirayama Y., Mukai M., Watanabe Y., Imai N., Ishiyama H., Jeong S.-C., Miyatake H., Oyaizu M., Matsuo Y., Sonoda T., Wada M
  • Journal Title: J. Physics B Volume: 47 Pages: 075201 (8)
  • DOI: 10.1088/0953-4075/47/7/075201.
  • Peer Reviewed
• [Journal Article] In-gas-cell laser ion source for KEK isotope separation system (2014)
  • Author(s): Mukai M., Hirayama Y., Jeong S.C., Imai N., Ishiyama H., Miyatake H., Oyaizu M., Watanabe Y.X., Kim Y.H
  • Journal Title: Rev. Sci. Instrum Volume: 85 Pages: 02B906 (3)
  • DOI: 10.1063/1.4827112.
  • Peer Reviewed
• [Journal Article] Study of collisions of 136Xe + 198Pt for the KEK isotope separator (2013)
  • Author(s): Watanabe Y.X., Hirayama Y., Imai N., Ishiyama H., Jeong S.C., Miyatake H., Clement E., de France G., Navin A., Rejmund M., Schmit C., Pollarolo G., Corradi L., Fioretto E., Motanari D., Choi S.H., Kim Y.H., Song J.S., Niikura M., Suzuki D., Nishibata H., Takatsu J.
  • Journal Title: Nucl. Instrum. Meth Volume: B 317 Pages: 752-755
  • DOI: 10.1016/j.nimb.2013.04.036.
  • Peer Reviewed
• [Journal Article] Off-line test of the KISS gas cell (2013)
  • Author(s): Hirayama Y.,Watanabe Y.X., Imai N., Ishiayma H., Jeong S.C., Miyatake H., Oyaizu M., Kim Y.H., Mukai M., Matsuo Y., Sonoda T., Wada M., Mark H., Kudryavstev Y., Van Duppen P
  • Journal Title: Nucl. Instrum. Meth Volume: 317 Pages: 480-483
  • DOI: 10.1016/j.nimb.2013.06.032.
  • Peer Reviewed
• [Presentation] Study of multinucleon transfer (MNT) reactions of ^<136>Xe + ^<198>Pt for production of exotic nuclei (2014)
  • Author(s): Watanabe Y.X
  • Organizer: FUSION14
  • Place of Presentation: New Delhi
  • Year and Date: 20140224-28
  • Invited
• [Presentation] beta-decay spectroscopy of r-process nuclei with N=126 at Kiss (2013)
  • Author(s): Hirayama Y
  • Organizer: The 12th international symposium on Origin of Matter and Evolution of Galaxies (OMEG12)
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 20131117-21
  • Invited
• [Presentation] Present Status of KISS (2013)
  • Author(s): Jeong S.C
  • Organizer: RIBF User Meeting
  • Place of Presentation: RIKEN, Wako, Japan
  • Year and Date: 20130626-27
  • Invited
• [Remarks] KEK RNB group 研究施設 KISS
  • URL: http://kekrnb.kek.jp
• [Remarks] In-Gas Laser Ionization for Spectroscopy NETwork 当研究グループの主催でRIKEN行われたIn-Gas Laser Ionization for Decay Spectroscopy Workshopに参加した研究者を中心に、定期的に情報を交換し、共有するための国際ネットワークを立ち上げた。(IGLIS-NET)Newsletter 発行(2号)
  • URL: http://kekrnb.kek.jp/iglis-net