Evidence for charged-particle decay of dipole-excited {sup 4}H clusters embedded in {sup 6}He and {sup 7}He

Journal Article · Fri Feb 15 04:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.021303· OSTI ID:21068101

Yamagata, T; Akimune, H; Banshou, Y; Hara, K Y; Ikemizu, H; Kinoshita, M; Ohta, M; Utsunomiya, H; Warashina, N ^[1]; Nakayama, S; Fushimi, K ^[2]; Fujiwara, M ^[3]; Greenfield, M B ^[4]; Hara, K; Hashimoto, H; Kawase, K; Nakanishi, K; Yosoi, M ^[3]; Sakama, M ^[5]; Tanaka, M ^[6]

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1. Department of Physics, Konan University, Kobe 658-8501 (Japan)
2. Department of Physics, University of Tokushima, Tokushima 770-8502 (Japan)
3. Research Center for Nuclear Physics, Osaka University, Osaka 567-0047 (Japan)
4. Department of Physics, International Christian University, Tokyo 113-0033 (Japan)
5. School of Health Science, University of Tokushima, Tokushima 770-8509 (Japan)
6. Kobe Tokiwa College, Kobe 654-0838 (Japan)

Charged-particle decay from the dipole resonances at E{sub x}=24 MeV in {sup 6}He and at E{sub x}=18 MeV in {sup 7}He was studied via the {sup 6,7}Li({sup 7}Li,{sup 7}Be x) coincidence experiment at 455 MeV and at 0 deg. These resonances are those that were interpreted as the analogs of the dipole resonances in the {alpha} clusters of {sup 6}Li and {sup 7}Li in our previous work. The dominant decay channels (branching ratios) of the dipole resonances are found to be d+t+n (26{approx}32%) and {alpha}+2n (47{approx}69%) for {sup 6}He and t+t+n (47{approx}55%) and {alpha}+3n (38{approx}47%) for {sup 7}He. The branching ratios measured for the d+t+n and t+t+n channels in {sup 6}He and {sup 7}He, respectively, are larger than those calculated in a simple statistical model by a factor of {approx}100. These results are consistent with the picture that the observed dipole resonances are analogs of the corresponding dipole resonances in the {alpha} clusters of {sup 6}Li and {sup 7}Li.

• OSTI ID: 21068101
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BERYLLIUM 7
BRANCHING RATIO
CHARGED PARTICLES
CLUSTER MODEL
DIPOLES
HELIUM 6
HELIUM 7
HYDROGEN 4
LITHIUM 6
LITHIUM 7
LITHIUM 7 REACTIONS
LITHIUM 7 TARGET
MEV RANGE
NUCLEAR DECAY
NUCLEAR STRUCTURE
RESONANCE
STATISTICAL MODELS