期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.222501
关键词
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资金
- Tohoku University's Focused Research Project
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) Japan [17070001, 21684011, 23244043, 24105003, 24740138, 15H02079]
- National Research Foundation in Korea [22.3038, 2010-0004752]
- National Research Foundation
- WCU program of the Ministry of Education, Science and Technology (Korea)
- Center for Korean J-PARC Users [2013K1A3A7A060565]
- National Research Foundation of Korea [2010-0004752] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [23244043, 21684011, 24105002, 24740138, 17070001, 24105003, 13J01075, 26800152, 15H02079, 24105001] Funding Source: KAKEN
The energy spacing between the spin-doublet bound state of He-4(Lambda)(1(+), 0(+)) was determined to be 1406 +/- 2 +/- 2 keV, by measuring gamma rays for the 1(+) -> 0(+) transition with a high efficiency germanium detector array in coincidence with the He-4(K-, pi(-))(Lambda)(4). He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus H-4(Lambda), the present result clearly indicates the existence of charge symmetry breaking (CSB) in Lambda N interaction. By combining the energy spacings with the known ground-state binding energies, it is also found that the CSB effect is large in the 0(+) ground state but is vanishingly small in the 1(+) excited state, demonstrating that the Lambda N CSB interaction has spin dependence.
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