Evidence of Xi hypernuclear production in the C-12(K-, K+)(Xi)Be-12 reaction - art. no. 054603

Khaustov, P Alburger, DE Barnes, PD Bassalleck, B Berdoz, AR Biglan, A Burger, T Carman, DS Chrien, RE Davis, CA Fischer, H Franklin, GB Franz, J Gan, L Ichikawa, A Iijima, T Imai, K Kondo, Y Koran, P Landry, M Lee, L Lowe, J Magahiz, R May, M McCrady, R Meyer, CA Merrill, F Motoba, T Page, SA Paschke, K Pile, PH Quinn, B Ramsay, WD Rusek, A Sawafta, R Schmitt, H Schumacher, RA Stotzer, RW Sutter, R Takeutchi, F van Oers, WTH Yamamoto, K Yamamoto, Y Yosoi, M Zeps, VJ

P. Khaustov et al., Evidence of Xi hypernuclear production in the C-12(K-, K+)(Xi)Be-12 reaction - art. no. 054603, PHYS REV C, 6105(5), 2000, pp. 4603

10

INGLESE

Article

Physics

PHYSICAL REVIEW C-NUCLEAR PHYSICS

0556-2813 → ACNP

6105

5

2000

ISI

0556-2813(200005)6105:5<4603:EOXHPI>2.0.ZU;2-E

The E885 Collaboration utilized the 1.8 GeV/cK(-) beam line at the Alternat ing Gradient Synchrotron (AGS) to accumulate greater than 10 times the worl d's existing data sample of (K-,Rf) events on carbon. A total of about 3x10 (5) (K-,K+) events were collected and analyzed. drop hypernuclear states ar e expected to be produced through the reaction K- + C-12-->K+ + Be-12(drop) . A signal could also result from direct production of (11)(Lambda)Bei+Lamb da without a distinct drop intermediate state. The measured missing-mass sp ectrum indicates the existence of a signal below the threshold for free dro p(-) production that cannot be explained by background or effects of limite d resolution. Although the resolution was not sufficient to resolve discret e hypernuclear states, the excess of events in the region of missing mass, kinematically inaccessible in free drop(-) production, can be compared with theoretical predictions for Be-12(drop) production. Reasonable agreement b etween the data and theory is achieved by assuming a drop-nucleus potential well depth V-0 drop of about 14 MeV within the Woods-Saxon prescription.