A facility for the study of neutron-rich light nuclei

Two-proton pickup reaction(He6,Be8)onMilin1, Miljanić2, Aliotta3 et al. 2004Phys. Rev. C

“…The population of the second 2 + state at E x = 5.96 MeV is weaker than the one for the first 2 + state, although the transition to the former one has a much larger theoretical strength [16]. Similar results have been obtained from other two-proton pickup reactions on 12 C [2, [17][18][19][20].…”

“…Another important advantage of the ͑ 6 He, 8 Be͒ reaction is its Q value. With a very high 2p-separation energy in 8 Be ͑S 2p = 27.23 MeV͒, there are only eight stable nuclei ( 4 He, 7 Li, 9 Be, 11 B, 13 C, 15 N, 18 O, and 48 Ca) for which the Q value of the reaction is negative.…”

“…This two-proton pickup spectrum can be compared with a one-proton pickup spectrum obtained with the 18 O͑d , 3 He͒ reaction at E d = 52 MeV [28]. The significant difference between these two spectra is a very strong population of the 3/2 − state at E x = 5.52 MeV in the 18 O͑d , 3 He͒ reaction (due to its p 3/2 −1 18 O g.s. configuration [28]), while the doublet at E x Ϸ 1.9 MeV is populated rather weakly compared to our results.…”

3+and2+states inBeMiljanić1 2004Phys. Rev. C6031View full textAdd to dashboardCite

“…Clear ᐉ = 1 angular distribution of the 11 B͑d, 3 He͒ 10 Be reaction involving this state [10] narrows it to 2 + . The same assignment is supported by its strong feeding in the 10 B͑d, 2 He͒ and 10 B͑ − , ␥͒ reactions [11,12], which favor transitions involving spin flip, as well as in the ͑ 12 C, 14 O͒ and other two-proton pickup reactions on 12 C [13][14][15][16]. The same values of spin and parity resulted from an analysis of measured angular correlations of the 6 Li͑ 7 Li, ␣ 6 Li͒ 3 He and 7 Li͑ 7 Li, ␣ 6 He͒ 4 He reactions [6], although one may have some reservations on the applicability of this method to the processes involving nonzero-spin nuclei.…”

Reconstruction of nuclear charged fragment trajectories from a large-gap sweeper magnet

“…In order to maximize the angular acceptance of the neutrons at zero degrees the dipole (or sweeper) magnet has to have a large gap, an opening at zero degrees ("C"-magnet), and has to be located as close to the target as possible. These stringent requirements do not allow the use of a full magnetic spectrometer which is typically used to determine the energy and angles of emitted particles in nuclear structure experiments [5][6][7][8][9][10][11]. For these spectrometers ion-optical codes have been developed to extract the four-momentum of the fragments at the target from the measured quantities following the spectrometer.…”