Double-beta-decay process of Calcium-48

• Project/Area Number: 19740123
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: YAKO Kentaro The University of Tokyo, 大学院・理学系研究科, 助教 (50361572)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥1,150,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥150,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥500,000 (Direct Cost: ¥500,000)
• Keywords: 二重ベータ崩壊 / 荷電交換反応 / 中性子ビーム / 多重極展開 / ガモフ・テラー遷移 / ガモフ・テラー共鳴状態

Research Abstract

二重ベータ崩壊核カルシウム48の2ニュートリノ二重ベータ崩壊過程の理解を目的に、その核遷移行列を決めているガモフ・テラー遷移強度分布を測定した。娘核チタン48から中間核スカンジウム48へのガモフ・テラー遷移強度は、従来の殻模型計算の予言と比べ、より高い励起領域にまで分散・分岐している、という結果を得た。このことは、現在の殻模型では二重ベータ崩壊過程の核行列を十分に理解できないことを示している。

Research Products

• [Journal Article] RCNP (n, p) facility (2008)
  • Author(s): K. Yako, H. Sakai, M. B. Greenfield, K. Hatanaka, M. Hatano, J. Kamiya, Y. Maeda, K. Nagayama, H. Okamura, K. Sekiguchi, Y. Shimizu, K. Suda, A. Tamii, and T. Wakasa
  • Journal Title: Nuclear Instruments and Methods in Physics Research A 592 Pages: 88-99
  • Peer Reviewed
• [Journal Article] The RCNP (n, p) facility (2008)
  • Author(s): K. Yako, et.al.
  • Journal Title: Nuclear Instruments and Methods in Physics Research A 592 Pages: 88-99
  • Peer Reviewed
• [Presentation] Study of nuclear matrix elements of two-neutrino double-beta-decay by (p, n) and (n, p) reactions (2008)
  • Author(s): K. Yako
  • Organizer: The 6^<th> Italy-Japan symposium on heavy ion physics
  • Place of Presentation: 東海村
  • Year and Date: 2008-11-11
• [Presentation] Study of nuclear matrix elements of two-neutrino double beta-decay by (p, n) and (n, p) reactions (2008)
  • Author(s): K. Yako
  • Organizer: ICHO-EFES international symposium on new facet of spin-isospin responses
  • Place of Presentation: Nishina Center, RIKEN
  • Year and Date: 2008-10-30
• [Presentation] Study of Nuclear matrix elements of two-neutrino double-beta-decay by (p, n) and (n, p) reactions (2008)
  • Author(s): K. Yako
  • Organizer: ICHO-EFES international symposium on new facet of spin-isospin responses
  • Place of Presentation: 理化学研究所
  • Year and Date: 2008-10-30
• [Presentation] (p,n)/(n,p)反応による2ν二重ベータ崩壊の核行列要素 (2008)
  • Author(s): 矢向謙太郎
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 山形大学
  • Year and Date: 2008-09-22
• [Presentation] (p, n)/(n, p)反応による2γ二重ベータ崩壊の核行列要素 (2008)
  • Author(s): 矢向謙太郎
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 山形大学
  • Year and Date: 2008-09-22
• [Presentation] Study of the 2-neutrino double-beta-decay process of ^<48>Ca and ^<116>Cd by (p, n) (n, p) reactions (2008)
  • Author(s): K. Yako
  • Organizer: Annual meeting of European network of theoretical astroparticle physics on physics of massive neutrinos
  • Place of Presentation: Milos Island, Greece
  • Year and Date: 2008-05-22
• [Presentation] Study of the 20neutrino double-beta-decay process of 48Ca and 116Cd by (p, n) (n, p) reactions (2008)
  • Author(s): K. Yako
  • Organizer: Annual meeting of European network of the oretical astroparticle physics on physics of massive neutrinos
  • Place of Presentation: ミロス島、ギリシャ
  • Year and Date: 2008-05-22
• [Presentation] ^<48>Ti(n,p)^<48>Sc反応による^<48>Ca二重β崩壊過程の研究 (2008)
  • Author(s): 三木謙二郎、酒井英行、笹野匡紀、野地俊平、矢向謙太郎
  • Organizer: 日本物理学会第63回年回
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-30
• [Presentation] <48>^Ti (n,p) <48>^Sc反応による48Ca二重β崩壊過程の研究 (2008)
  • Author(s): 三木 謙二郎
  • Organizer: 日本物理学会第63回年会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-24
• [Presentation] Intermediate states of double beta decay nuclei studied by (p, n) and (n, p) reactions (2007)
  • Author(s): K. Yako
  • Organizer: Japan-German workshop on nuclear structure and astrophysics
  • Place of Presentation: Chiemsee, Germany
  • Year and Date: 2007-10-01
• [Presentation] Intermediate states of double-beta decay nuclei studied by (p,n) and (n,p) reactions (2007)
  • Author(s): K. Yako
  • Organizer: 3rd Japanese-German EFES (JSPS)-DFG/GSI workshop on Nuclear Structure and Astrophysics
  • Place of Presentation: キームぜー、ドイツ
  • Year and Date: 2007-10-01