Candidate Resonant Tetraneutron State Populated by the ^{4}He(^{8}He,^{8}Be) Reaction

Authors :: K, Kisamori
S, Shimoura
H, Miya
S, Michimasa
S, Ota
M, Assie
H, Baba
T, Baba
D, Beaumel
M, Dozono
T, Fujii
N, Fukuda
S, Go
F, Hammache
E, Ideguchi
N, Inabe
M, Itoh
D, Kameda
S, Kawase
T, Kawabata
M, Kobayashi
Y, Kondo
T, Kubo
Y, Kubota
M, Kurata-Nishimura
C S, Lee
Y, Maeda
H, Matsubara
K, Miki
T, Nishi
S, Noji
S, Sakaguchi
H, Sakai
Y, Sasamoto
M, Sasano
H, Sato
Y, Shimizu
A, Stolz
H, Suzuki
M, Takaki
H, Takeda
S, Takeuchi
A, Tamii
L, Tang
H, Tokieda
M, Tsumura
T, Uesaka
K, Yako
Y, Yanagisawa
R, Yokoyama
K, Yoshida
Source :: Physical review letters. 116(5)
Publication Year :: 2015
Abstract: A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of the state is 0.83±0.65(stat)±1.25(syst) MeV above the threshold of four-neutron decay with a significance level of 4.9σ. Utilizing the large positive Q value of the (^{8}He,^{8}Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently.

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