First observation of a nuclear s-state of a $\Xi$ hypernucleus, $^{15}_{\Xi}{\rm C}$

Yoshimoto, M.; Ahn, J.K.; Bassalleck, B.; Ekawa, H.; Endo, Y.; Fujita, M.; Han, Y.; Hashimoto, T.; Hayakawa, S.H.; Hicks, K.

doi:10.1093/ptep/ptab073

First observation of a nuclear s-state of a $\Xi$ hypernucleus, $^{15}_{\Xi}{\rm C}$

M. Yoshimoto
(
- Gifu U.
)
,
J.K. Ahn
(
- Korea U.
)
,
B. Bassalleck
(
- New Mexico U.
)
,
H. Ekawa
(
- Nishina Ctr., RIKEN and
- RIKEN BNL
)
,
Y. Endo
(
- Gifu U.
)

Mar 15, 2021

26 pages

Published in:

PTEP 2021 (2021) 7, 7

Published: Jul 18, 2021

e-Print:

2103.08793 [nucl-ex]

DOI:

10.1093/ptep/ptab073

View in:

pdf

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Abstract: (Oxford University Press)

Bound systems of |

\Xi^-

|–|

^{14}_{}{\rm N}

| are studied via |

\Xi^-

| capture at rest followed by emission of a twin single-|

\Lambda

| hypernucleus in the emulsion detectors. Two events forming extremely deep |

\Xi^-

| bound states were obtained by analysis of a hybrid method in the E07 experiment at J-PARC and reanalysis of the E373 experiment at KEK-PS. The decay mode of one event was assigned as |

\Xi^-+^{14}\!\,\!\!{\rm N}\to^{5}_{\Lambda}\!\!\!{\rm He} + ^{5}_{\Lambda}\!\!{\rm He} + ^{4}\!\!{\rm He} + \mathrm{n}

|⁠. Since there are no excited states for daughter particles, the binding energy of the |

\Xi^-

| hyperon, |

B_{\Xi^-}

|⁠, in the |

^{14}_{}{\rm N}

| nucleus was uniquely determined to be |

6.27 \pm 0.27

| MeV. Another |

\Xi^-

|–|

^{14}_{}{\rm N}

| system via the decay |

^{9}_{\Lambda}{\rm Be} + ^{5}_{\Lambda}\!\!\!{\rm He} + \mathrm{n}

| brings a |

B_{\Xi^-}

| value, |

8.00 \pm 0.77

| MeV or |

4.96 \pm 0.77

| MeV, where the two possible values of |

B_{\Xi^-}

| correspond to the ground and the excited states of the daughter |

^{9}_{\Lambda}{\rm Be}

| nucleus, respectively. Because the |

B_{\Xi^-}

| values are larger than those of the previously reported events (KISO and IBUKI), which are both interpreted as the nuclear |

1p

| state of the |

\Xi^-

|–|

^{14}_{}{\rm N}

| system, these new events give the first indication of the nuclear |

1s

| state of the |

\Xi

| hypernucleus, |

^{15}_{\Xi}{\rm C}

|⁠.

Note:

26 pages, 7 figures

D14 Hypernuclei
D25 Hadron reactions
D29 Nuclear decays and radioactivities (including fission)
capture
nucleus
hypernucleus
excited state
nuclear emulsion
binding energy
decay modes

References(59)

Figures(7)

[1]

Perhaps a Stable Dihyperon

Robert L. Jaffe
(
- SLAC and
- MIT, LNS
)

- Phys.Rev.Lett. 38 (1977) 195-198,
- Phys.Rev.Lett. 38 (1977) 617 (erratum)
•
DOI:
- 10.1103/PhysRevLett.38.195

[1]

Perhaps a Stable Dihyperon

Robert L. Jaffe
(
- SLAC and
- MIT, LNS
)

- Phys.Rev.Lett. 38 (1977) 195-198,
- Phys.Rev.Lett. 38 (1977) 617 (erratum)
•
DOI:
- 10.1103/PhysRevLett.38.195

[2]

Hypernuclear Physics for Neutron Stars

Jurgen Schaffner-Bielich

- Nucl.Phys.A 804 (2008) 309-321
•
e-Print:
- 0801.3791
•
DOI:
- 10.1016/j.nuclphysa.2008.01.005

[3]

50 years of hypernuclear physics. I. The early experiments

D.H. Davis
(
- University Coll. London
)

- Nucl.Phys.A 754 (2005) 3-13
•
DOI:
- 10.1016/j.nuclphysa.2005.01.002

[4]

Spectroscopy of Lambda hypernuclei

O. Hashimoto
(
- Tohoku U.
)
,
H. Tamura
(
- Tohoku U.
)

- Prog.Part.Nucl.Phys. 57 (2006) 564-653
•
DOI:
- 10.1016/j.ppnp.2005.07.001

[5]

Strangeness in nuclear physics

- Rev.Mod.Phys. 88 (2016) 3, 035004
•
e-Print:
- 1605.00557
•
DOI:
- 10.1103/RevModPhys.88.035004

[6]

The identification of a double hyperfragment

et al.

- Nucl.Phys. 49 (1963) 121-132
•
DOI:
- 10.1016/0029-5582(63)90080-4

[7]

THE IDENTIFICATION OF A CASCADE HYPERNUCLEUS

- Nuovo Cim.A 54 (1979) 333-339
•
DOI:
- 10.1007/BF02770008

[8]

XI HYPERNUCLEI

C.B. Dover
(
- Brookhaven
)
,
A. Gal
(
- Hebrew U.
)

- Annals Phys. 146 (1983) 309-348,
- Brookhaven Nat. Lab. Upton - BNL-31728 (REC.SEP.82) 75p,
- Ann. Phys. ( N.y.) 146 ( 1983) 309-348 and Brookhaven Nat. Lab. Upton - BNL-31728 (REC.SEP.82) 75p
•
DOI:
- 10.1016/0003-4916(83)90036-2