Study of the β-delayed neutron decay of 17C and 18C

Scheller, K.; Vouzoukas, S.; Wiescher, M.; Pfeiffer, B.; Kratz, K. L.; Morrissey, D. J.; Sherrill, B. M.; Steiner, M.; Hellström, M.; Winger, J. A.

doi:10.1016/0375-9474(94)00465-y

Cited by 20 publications

(15 citation statements)

References 28 publications

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“…All of the predicted P n values for 23 O β decay were close to 30% and thus agreed with the experimental values with the exception of a value predicted by Wildenthal et al, which was only 2% [5]. The energy levels in the daughter of 23 O β decay were measured using the heavy-ion transfer reaction 22 Ne( 18 O, 17 F) 23 F by Orr et al [6]. Six energy levels were observed in 23 F, in which the ground state and the second and third excited states were assigned to be spin and parity of 5/2 + , 7/2 + , and 9/2 + , respectively, based on shell model calculations.…”

Section: Introductionsupporting

confidence: 57%

“…The knowledge of nuclear structure, in particular in 23 F, is important as it should be sensitive to the s and d orbital splitting. 23 F also has the structure of a single proton outside the reported doubly magic 22 O [1,2]. The present work focused on the β-delayed neutrons and γ rays from 23 O β decay to establish the energies of neutron bound and unbound states in 23 F. This paper presents the study on β decay of 23 O using a neutron spectroscopic array.…”

Section: Introductionmentioning

confidence: 96%

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Structure ofF23via β decay ofO23

et al. 2007

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The nuclear states in 23 F have been investigated following the β decay of 23 O. The measurement of 23 O was carried out at the National Superconducting Cyclotron Laboratory using fragments from the reaction of a 48 Ca beam in a Be target. The half-life and total neutron emission probability were determined to be 97(8) ms and 7(2)%, respectively, for 23 O β decay. Ten γ -ray decays in 23 F and a single γ -ray in 22 F were observed to establish the β decay scheme for 23 O. Shell model calculations are in reasonable agreement with the measured β branching and B(GT) values for the lowest energy state. The excitation energies of the first 1/2 + and 3/2 + states have been determined to be 2243(8) and 4066(16) keV, respectively, indicating a widening of the 5/2 + -1/2 + state gap in 23 F. The decay scheme of the largest contaminant 26 Ne in the experiment was established.

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Section: Introductionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 96%

Structure ofF23via β decay ofO23

et al. 2007

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“…(1) 88 (2) 67 (1) 295 (2) 352 (1) 511 (2) 596 (5) 609 (2) 696 (8) 770 (2) 936 (2) 1123 (3) 1242 (3) 1411 (5) 4782 ( …”

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“…Hence, a β-decay study is useful for studying neutron-rich nuclei located away from the stability line, owing to the large Q β windows. Over the past several years, a number of such studies have been performed on the structure of light-mass neutron-rich nuclei through the time-of-flight (TOF) measurement of emitted β-delayed neutrons [8,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…It has been experimentally shown that none of the odd mass neutron-rich carbon isotopes, GS assignment was performed through the study of GS properties based on the direct reaction [3][4][5][6][7], β-delayed neutron spectroscopy of the β decay of 17 C [8], and magnetic moment of 17 C [9]. In the extremely neutron-rich nucleus 19 C with N = 13, the I π GS value again becomes 1/2 + ; this was confirmed and discussed in connection with the formation of a neutron halo [6,10,11].…”

Section: Introductionmentioning

confidence: 99%

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β-delayed neutron andγ-ray spectroscopy of17C utilizing spin-polarized
Ueno
¹
,
Miyatake
²
,
Yamamoto
³

et al. 2013
Phys. Rev. C
28
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6
0
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Excited states in 17 C were investigated through the measurement of β-delayed neutrons and γ rays emitted in the β decay of 17 B. In the measurement, three negative-parity states and two inconclusive states, were identified in 17 C above the neutron threshold energy, and seven γ lines were identified in a β-delayed multiple neutron emission of the 17 B β decay. From these transitions, the β-decay scheme of 17 B was determined. In particular, a de-excitation 1766-keV γ line from the first excited state of 16 C was observed in coincidence with the emitted β-delayed neutrons, and this changes the previously reported β-decay scheme of 17 B and level structure of 17 C. In the present work, the β-NMR technique is combined with the β-delayed particle measurements using a fragmentation-induced spin-polarized 17 B beam. This new scheme allows us to determine the spin parity of β-decay feeding excited states based on the difference in the discrete β-decay asymmetry parameters, provided the states are connected through the Gamow-Teller transition. In this work, I π = 1/2 − , 3/2 − , and (5/2 − ) are assigned to the observed states at E x = 2.71(2), 3.93(2), and 4.05(2) MeV in 17 C, respectively.

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