Observation of new states of the 7He isotope
The formation of the 7 He heavy isotope has been studied in the 11 B(π − , pt ) 7 He, 11 B(π − , dd ) 7 He, and 10 B(π − , pd ) 7 He reactions of absorption of stopped π − mesons. No indications of the existence of a low-lying level with E x ∼ 1 MeV have been obtained in any of the three reactions....
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| Veröffentlicht in: | JETP letters 2015, Vol.101 (2), p.69-73 |
|---|---|
| Hauptverfasser: | , , , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | The formation of the
7
He heavy isotope has been studied in the
11
B(π
−
,
pt
)
7
He,
11
B(π
−
,
dd
)
7
He, and
10
B(π
−
,
pd
)
7
He reactions of absorption of stopped π
−
mesons. No indications of the existence of a low-lying level with
E
x
∼ 1 MeV have been obtained in any of the three reactions. The existence of three narrow states with excitation energies
E
x
= 3.1(1), 4.90(15), and 6.65(15) MeV has been proven. Highly excited states with
E
x
= 16.9(5) MeV, Γ = 1.0(3) MeV,
E
x
= 19.8(3) MeV, Γ = 1.5(3) MeV, and
E
x
= 24.8(4) MeV, Γ = 4.6(7) MeV have been identified. |
|---|---|
| ISSN: | 0021-3640 1090-6487 |
| DOI: | 10.1134/S0021364015020083 |